Gamma-ray Burst 241030B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 30 Oct 24 18:34:51 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1263840,   Seg_Num: 0
GRB_RA:           50.788d {+03h 23m 09s} (J2000),
                  51.180d {+03h 24m 43s} (current),
                  50.001d {+03h 20m 00s} (1950)
GRB_DEC:         +34.432d {+34d 25' 57"} (J2000),
                 +34.520d {+34d 31' 10"} (current),
                 +34.255d {+34d 15' 18"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       6508 [cnts]    Image_Peak=225 [image_cnts]
TRIGGER_DUR:     2.048 [sec] 
TRIGGER_INDEX:   263     E_range: 25-100 keV
BKG_INTEN:       53618 [cnts]
BKG_TIME:        66829.55 SOD {18:33:49.55} UT
BKG_DUR:         24 [sec]
GRB_DATE:        20613 TJD;   304 DOY;   24/10/30
GRB_TIME:        66860.91 SOD {18:34:20.91} UT
GRB_PHI:          70.70 [deg]
GRB_THETA:        38.70 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     28.31 [sigma]
IMAGE_SIGNIF:    9.43 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +2  +0  +0  +0 +90  +0 
SUN_POSTN:       215.47d {+14h 21m 53s}  -14.12d {-14d 07' 08"}
SUN_DIST:        155.15 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      196.92d {+13h 07m 41s}   -8.32d {-08d 19' 23"}
MOON_DIST:       139.10 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      155.30,-18.73 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       57.27, 15.34 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 114.22,11.73 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(0.0<100sec) coincident with the FERMI_GBM event (trignum=752006065).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 30 Oct 24 18:34:50 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      48
TRIGGER_NUM:     752006065
GRB_RA:           55.350d {+03h 41m 24s} (J2000),
                  55.755d {+03h 43m 01s} (current),
                  54.537d {+03h 38m 09s} (1950)
GRB_DEC:         +37.250d {+37d 15' 00"} (J2000),
                 +37.328d {+37d 19' 41"} (current),
                 +37.090d {+37d 05' 24"} (1950)
GRB_ERROR:       11.92 [deg radius, statistical plus systematic]
GRB_INTEN:       183 [cnts/sec]
DATA_SIGNIF:     13.10 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        20613 TJD;   304 DOY;   24/10/30
GRB_TIME:        66860.39 SOD {18:34:20.39} UT
GRB_PHI:         190.00 [deg]
GRB_THETA:        50.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      1.02
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   2%  GRO_J0422_32
DETECTORS:       0,0,0, 0,0,0, 1,1,0, 0,0,0, 0,0,
SUN_POSTN:       215.47d {+14h 21m 53s}  -14.12d {-14d 07' 08"}
SUN_DIST:        150.60 [deg]   Sun_angle= 10.6 [hr] (West of Sun)
MOON_POSTN:      196.92d {+13h 07m 41s}   -8.32d {-08d 19' 23"}
MOON_DIST:       134.48 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      156.63,-14.26 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       61.73, 17.15 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241030774/quicklook/glg_lc_medres34_bn241030774.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 148.48,24.23 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 30 Oct 24 18:34:59 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      59
TRIGGER_NUM:     752006065
GRB_RA:           49.517d {+03h 18m 04s} (J2000),
                  49.906d {+03h 19m 37s} (current),
                  48.736d {+03h 14m 57s} (1950)
GRB_DEC:         +33.817d {+33d 49' 00"} (J2000),
                 +33.906d {+33d 54' 22"} (current),
                 +33.635d {+33d 38' 04"} (1950)
GRB_ERROR:       7.30 [deg radius, statistical plus systematic]
GRB_INTEN:       264 [cnts/sec]
DATA_SIGNIF:     25.50 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        20613 TJD;   304 DOY;   24/10/30
GRB_TIME:        66860.39 SOD {18:34:20.39} UT
GRB_PHI:         186.00 [deg]
GRB_THETA:        55.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.94
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      91%  GRB
2nd_MOST_LIKELY:   7%  GRO_J0422_32
DETECTORS:       0,0,0, 0,0,0, 1,1,0, 0,0,0, 0,0,
SUN_POSTN:       215.47d {+14h 21m 53s}  -14.12d {-14d 07' 08"}
SUN_DIST:        156.28 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      196.92d {+13h 07m 41s}   -8.32d {-08d 19' 25"}
MOON_DIST:       140.32 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      154.76,-19.84 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       56.05, 15.03 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241030774/quicklook/glg_lc_medres34_bn241030774.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 148.48,24.23 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=1263840).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 30 Oct 24 18:35:46 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      1
TRIGGER_NUM:     752006065
GRB_RA:           54.940d {+03h 39m 46s} (J2000),
                  55.335d {+03h 41m 20s} (current),
                  54.146d {+03h 36m 35s} (1950)
GRB_DEC:         +34.220d {+34d 13' 12"} (J2000),
                 +34.299d {+34d 17' 56"} (current),
                 +34.058d {+34d 03' 31"} (1950)
GRB_ERROR:       3.89 [deg radius, statistical only]
DATA_SIGNIF:     25.90 [sigma]
DATA_INTERVAL:   6.144 [sec]
GRB_DATE:        20613 TJD;   304 DOY;   24/10/30
GRB_TIME:        66860.39 SOD {18:34:20.39} UT
GRB_PHI:         191.00 [deg]
GRB_THETA:        53.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       215.47d {+14h 21m 53s}  -14.12d {-14d 07' 09"}
SUN_DIST:        152.99 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:      196.93d {+13h 07m 43s}   -8.33d {-08d 19' 36"}
MOON_DIST:       136.23 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      158.31,-16.84 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       60.65, 14.28 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241030774/quicklook/glg_lc_medres34_bn241030774.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_752006065.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=1263840).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 30 Oct 24 18:36:18 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      2
TRIGGER_NUM:     752006065
GRB_RA:           54.950d {+03h 39m 48s} (J2000),
                  55.345d {+03h 41m 23s} (current),
                  54.156d {+03h 36m 37s} (1950)
GRB_DEC:         +34.240d {+34d 14' 24"} (J2000),
                 +34.319d {+34d 19' 08"} (current),
                 +34.079d {+34d 04' 43"} (1950)
GRB_ERROR:       3.76 [deg radius, statistical only]
DATA_SIGNIF:     24.70 [sigma]
DATA_INTERVAL:   7.168 [sec]
GRB_DATE:        20613 TJD;   304 DOY;   24/10/30
GRB_TIME:        66860.39 SOD {18:34:20.39} UT
GRB_PHI:         191.00 [deg]
GRB_THETA:        53.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       215.47d {+14h 21m 53s}  -14.12d {-14d 07' 10"}
SUN_DIST:        152.97 [deg]   Sun_angle= 10.7 [hr] (West of Sun)
MOON_POSTN:      196.93d {+13h 07m 44s}   -8.33d {-08d 19' 43"}
MOON_DIST:       136.22 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      158.31,-16.82 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       60.66, 14.30 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241030774/quicklook/glg_lc_medres34_bn241030774.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_752006065.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=1263840).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 30 Oct 24 18:35:08 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     752006065
GRB_RA:           55.900d {+03h 43m 36s} (J2000),
                  56.289d {+03h 45m 09s} (current),
                  55.118d {+03h 40m 28s} (1950)
GRB_DEC:         +31.790d {+31d 47' 24"} (J2000),
                 +31.867d {+31d 52' 02"} (current),
                 +31.632d {+31d 37' 56"} (1950)
GRB_ERROR:       3.90 [deg radius, statistical only]
DATA_SIGNIF:     27.40 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        20613 TJD;   304 DOY;   24/10/30
GRB_TIME:        66860.39 SOD {18:34:20.39} UT
GRB_PHI:         193.00 [deg]
GRB_THETA:        55.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       215.47d {+14h 21m 53s}  -14.12d {-14d 07' 09"}
SUN_DIST:        153.98 [deg]   Sun_angle= 10.6 [hr] (West of Sun)
MOON_POSTN:      196.92d {+13h 07m 42s}   -8.32d {-08d 19' 27"}
MOON_DIST:       136.56 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      160.58,-18.22 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       60.88, 11.73 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241030774/quicklook/glg_lc_medres34_bn241030774.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_752006065.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=1263840).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 30 Oct 24 18:43:48 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     752006065
GRB_RA:           52.660d {+03h 30m 38s} (J2000),
                  53.058d {+03h 32m 14s} (current),
                  51.860d {+03h 27m 26s} (1950)
GRB_DEC:         +36.010d {+36d 00' 36"} (J2000),
                 +36.093d {+36d 05' 36"} (current),
                 +35.840d {+35d 50' 23"} (1950)
GRB_ERROR:       2.98 [deg radius, statistical only]
GRB_DATE:        20613 TJD;   304 DOY;   24/10/30
GRB_TIME:        66860.39 SOD {18:34:20.39} UT
GRB_PHI:         188.00 [deg]
GRB_THETA:        52.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       215.48d {+14h 21m 54s}  -14.12d {-14d 07' 16"}
SUN_DIST:        152.97 [deg]   Sun_angle= 10.8 [hr] (West of Sun)
MOON_POSTN:      196.99d {+13h 07m 57s}   -8.36d {-08d 21' 25"}
MOON_DIST:       137.04 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      155.63,-16.56 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       59.23, 16.47 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241030774/quicklook/glg_lc_medres34_bn241030774.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241030774/quicklook/glg_locplot_all_bn241030774.png
COMMENTS:        Fermi-GBM Final Position.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file should be available by the time this FINAL notice is produced.  
COMMENTS:        This notice was generated completely by automated pipeline processing.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=1263840).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 30 Oct 24 18:37:04 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     1263840,   Seg_Num: 0
POINT_RA:         50.784d {+03h 23m 08s} (J2000)
POINT_DEC:       +34.424d {+34d 25' 27"} (J2000)
IMG_START_DATE:  20613 TJD;   304 DOY;   24/10/30
IMG_START_TIME:  67018.07 SOD {18:36:58.07} UT,   157.2 [sec] since BAT Trigger Time
COUNTS:          24    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        4    Max_iter_allowed= 4
ERROR_CODE:      2
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        Algorithm did not converge; too many iterations.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 30 Oct 24 18:38:14 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1263840,   Seg_Num: 0
GRB_RA:           50.788d {+03h 23m 09s} (J2000),
                  51.180d {+03h 24m 43s} (current),
                  50.001d {+03h 20m 00s} (1950)
GRB_DEC:         +34.432d {+34d 25' 57"} (J2000),
                 +34.520d {+34d 31' 10"} (current),
                 +34.255d {+34d 15' 18"} (1950)
GRB_DATE:        20613 TJD;   304 DOY;   24/10/30
GRB_TIME:        66860.91 SOD {18:34:20.91} UT
TRIGGER_INDEX:   263
GRB_PHI:          70.70 [deg]
GRB_THETA:        38.70 [deg]
DELTA_TIME:      64.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     28.31 [sigma]
IMAGE_SIGNIF:    9.43 [sigma]
LC_URL:          sw01263840000msb.lc
SUN_POSTN:       215.47d {+14h 21m 53s}  -14.12d {-14d 07' 11"}
SUN_DIST:        155.15 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      196.95d {+13h 07m 47s}   -8.34d {-08d 20' 09"}
MOON_DIST:       139.13 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      155.30,-18.73 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       57.27, 15.34 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 114.22,11.73 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 30 Oct 24 18:40:02 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1263840,   Seg_Num: 0
POINT_RA:         50.784d {+03h 23m 08s} (J2000)
POINT_DEC:       +34.424d {+34d 25' 27"} (J2000)
POINT_ROLL:      38.032d
IMG_START_DATE:  20613 TJD;   304 DOY;   24/10/30
IMG_START_TIME:  67021.70 SOD {18:37:01.70} UT,   160.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.414
N_STARS:         65
X_OFFSET:        524 [pixels]
Y_OFFSET:        520 [pixels]
X_MAX:           1483 [pixels]
Y_MAX:           1479 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw01263840000msufc0160.fits
SUN_POSTN:       215.47d {+14h 21m 54s}  -14.12d {-14d 07' 13"}
SUN_DIST:        155.16 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      196.96d {+13h 07m 50s}   -8.34d {-08d 20' 34"}
MOON_DIST:       139.15 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      155.30,-18.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.26, 15.33 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 30 Oct 24 18:40:15 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1263840,   Seg_Num: 0
POINT_RA:         50.784d {+03h 23m 08s} (J2000)
POINT_DEC:       +34.424d {+34d 25' 27"} (J2000)
POINT_ROLL:      38.032d
IMG_START_DATE:  20613 TJD;   304 DOY;   24/10/30
IMG_START_TIME:  67021.70 SOD {18:37:01.70} UT,   160.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.414
N_STARS:         65
X_OFFSET:        524 [pixels]
Y_OFFSET:        520 [pixels]
X_MAX:           1483 [pixels]
Y_MAX:           1479 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw01263840000msufc0160.fits
SUN_POSTN:       215.47d {+14h 21m 54s}  -14.12d {-14d 07' 13"}
SUN_DIST:        155.16 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      196.96d {+13h 07m 51s}   -8.34d {-08d 20' 37"}
MOON_DIST:       139.15 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      155.30,-18.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.26, 15.33 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #37980
The Fermi GBM team reports the detection of a likely LONG GRB
At 18:34:20 UT on 30 Oct 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 241030B (trigger 752006065.391554 / 241030774).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 52.7, Dec = 36.0 (J2000 degrees, equivalent to J2000 03h 30m, 36d 00'), with a statistical uncertainty of 3.0 degrees.
The angle from the Fermi LAT boresight is 52.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241030774/quicklook/glg_skymap_all_bn241030774.png
The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241030774/quicklook/glg_healpix_all_bn241030774.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241030774/quicklook/glg_lc_medres34_bn241030774.gif
GCN Circular #37981
N. J. Klingler (GSFC/UMBC/CRESSTII), M. Ferro (INAF-OAB), J. A. Kennea (PSU), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), T. M. Parsotan (GSFC), C. Salvaggio (INAF-OAB), T. Sbarrato (INAF-OAB) and M. A. Williams (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 18:34:20 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 241030B (trigger=1263840). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 50.788, +34.432 which is
```
   RA(J2000) = 03h 23m 09s
   Dec(J2000) = +34d 25' 57"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single peak structure with a duration of about 8 sec. The peak count rate was ~2500 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 18:36:58.0 UT, 157.2 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 50.79212, 34.44596 which is equivalent to:
```
   RA(J2000)  = 03h 23m 10.11s
   Dec(J2000) = +34d 26' 45.5"
```
with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 51 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at https://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 2.01 x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 160 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.203.
Burst Advocate for this burst is N. J. Klingler (noelklin AT umbc.edu). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 30 Oct 24 18:52:55 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1263840,   Seg_Num: 0
POINT_RA:         50.783d {+03h 23m 08s} (J2000)
POINT_DEC:       +34.425d {+34d 25' 32"} (J2000)
POINT_ROLL:      38.031d
IMG_START_DATE:  20613 TJD;   304 DOY;   24/10/30
IMG_START_TIME:  67721.89 SOD {18:48:41.89} UT,   861.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.254
N_STARS:         190
X_OFFSET:        284 [pixels]
Y_OFFSET:        280 [pixels]
X_MAX:           1723 [pixels]
Y_MAX:           1719 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw01263840000msufc0860.fits
SUN_POSTN:       215.48d {+14h 21m 56s}  -14.12d {-14d 07' 23"}
SUN_DIST:        155.17 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      197.06d {+13h 08m 13s}   -8.39d {-08d 23' 30"}
MOON_DIST:       139.25 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      155.30,-18.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.26, 15.34 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 30 Oct 24 18:53:11 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1263840,   Seg_Num: 0
POINT_RA:         50.783d {+03h 23m 08s} (J2000)
POINT_DEC:       +34.425d {+34d 25' 32"} (J2000)
POINT_ROLL:      38.031d
IMG_START_DATE:  20613 TJD;   304 DOY;   24/10/30
IMG_START_TIME:  67721.89 SOD {18:48:41.89} UT,   861.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.254
N_STARS:         190
X_OFFSET:        284 [pixels]
Y_OFFSET:        280 [pixels]
X_MAX:           1723 [pixels]
Y_MAX:           1719 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw01263840000msufc0860.fits
SUN_POSTN:       215.48d {+14h 21m 56s}  -14.12d {-14d 07' 23"}
SUN_DIST:        155.17 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      197.06d {+13h 08m 14s}   -8.39d {-08d 23' 34"}
MOON_DIST:       139.25 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      155.30,-18.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.26, 15.34 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 30 Oct 24 18:54:17 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1263840,   Seg_Num: 0
POINT_RA:         50.783d {+03h 23m 08s} (J2000)
POINT_DEC:       +34.425d {+34d 25' 32"} (J2000)
ROLL:            38.031d
IMG_START_DATE:  20613 TJD;   304 DOY;   24/10/30
IMG_START_TIME:  67721.89 SOD {18:48:41.89} UT,   861.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     752006956
X_OFFSET:        843 [pixels]
Y_OFFSET:        839 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1003
Y_GRB_POS:       999
BINNING_INDEX:   1
IM_URL:          sw01263840000msuni0895.fits
SUN_POSTN:       215.48d {+14h 21m 56s}  -14.12d {-14d 07' 24"}
SUN_DIST:        155.17 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      197.07d {+13h 08m 16s}   -8.40d {-08d 23' 49"}
MOON_DIST:       139.26 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      155.30,-18.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.26, 15.34 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 30 Oct 24 18:54:30 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1263840,   Seg_Num: 0
POINT_RA:         50.783d {+03h 23m 08s} (J2000)
POINT_DEC:       +34.425d {+34d 25' 32"} (J2000)
ROLL:            38.031d
IMG_START_DATE:  20613 TJD;   304 DOY;   24/10/30
IMG_START_TIME:  67721.89 SOD {18:48:41.89} UT,   861.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     752006956
X_OFFSET:        843 [pixels]
Y_OFFSET:        839 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1003
Y_GRB_POS:       999
BINNING_INDEX:   1
IM_URL:          sw01263840000msuni0895.fits
SUN_POSTN:       215.48d {+14h 21m 56s}  -14.12d {-14d 07' 24"}
SUN_DIST:        155.17 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      197.07d {+13h 08m 16s}   -8.40d {-08d 23' 52"}
MOON_DIST:       139.26 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      155.30,-18.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.26, 15.34 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 30 Oct 24 18:54:39 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     1263840,   Seg_Num: 0
GRB_RA:           50.7926d {+03h 23m 10.22s} (J2000),
                  51.1846d {+03h 24m 44.29s} (current),
                  50.0054d {+03h 20m 01.30s} (1950)
GRB_DEC:         +34.4469d {+34d 26' 48.8"} (J2000),
                 +34.5339d {+34d 32' 02.0"} (current),
                 +34.2694d {+34d 16' 09.9"} (1950)
GRB_ERROR:       1.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  20613 TJD;   304 DOY;   24/10/30
IMG_START_TIME:  67029.00 SOD {18:37:09.00} UT,   168.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       215.48d {+14h 21m 56s}  -14.12d {-14d 07' 24"}
SUN_DIST:        155.15 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      197.07d {+13h 08m 16s}   -8.40d {-08d 23' 54"}
MOON_DIST:       139.24 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      155.29,-18.72 [deg] galactic lon,lat of the burst
ECL_COORDS:       57.28, 15.35 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN Circular #37983
P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
Using promptly downlinked XRT event data for GRB 241030B, we find an enhanced XRT position of the afterglow: RA, Dec: 50.79269, 34.44691 which is equivalent to:
```
   RA (J2000)  = 03 23 10.24
   Dec (J2000) = +34 26 48.9
```
with an uncertainty of 1.9 arcseconds (radius, 90% confidence). Analysis of the promptly available data is online at http://www.swift.ac.uk/sper/1263840.
Position enhancement is is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular is an official product of the Swift-XRT team.
GCN Circular #37984
SVOM/ECLAIRs Commissioning Team: Donghua Zhao, Wenjin Xie (NAOC), St=C3=A9p= hane Schanne, Fr=C3=A9d=C3=A9ric Chateau, Nicolas Dagoneau, Herv=C3=A9 Le P= rovost (CEA), Jean-Luc Atteia, Laurent Bouchet, Sebastien Guillot, Juliette= Alaux (IRAP), Alexis Coleiro, Floriane Cangemi (APC), Tais Maiolino (LUPM)= , Karine Mercier, Marie-Claire Charmeau, Stefano Crepaldi (CNES)
SVOM JSWG: Jian-Yan Wei (NAOC), Bertrand Cordier (CEA), Shuang-Nan Zhang (I= HEP), St=C3=A9phane Basa (LAM), Olivier Godet (IRAP), Arnaud Claret (CEA), = Zi-Gao Dai (USTC), Fr=C3=A9d=C3=A9ric Daigne (IAP), Jin-Song Deng (NAOC), A= ndrea Goldwurm (APC), Diego G=C3=B6tz (CEA), Xu-Hui Han (NAOC), Cyril Lacha= ud (APC), En-Wei Liang (GXU), Yu-Lei Qiu (NAOC), Susanna Vergani (Obs.Paris= ), Jing Wang (NAOC), Chao Wu (NAOC), Li-Ping Xin (NAOC), Bing Zhang (UNLV)
Report on behalf of the SVOM team:
During the commissioning phase, the SVOM/ECLAIRs telescope triggered and lo= calized GRB 241030B at 2024-10-30T18:34:19 UTC (Tb) which was also detected= by Fermi GBM (Fermi GBM team, GCN 37956) and Swift BAT (Klingler et al, GC= N 37981).
The following trigger information was received on the ground with low-laten= cy by the SVOM VHF Alert Network. The burst was detected by both the on-boa= rd Count-Rate Trigger (CRT) and Image Trigger (IMT) and 15 alerts were rece= ived. The light-curve shows a single peak of about 8 s duration. The CRT de= tected the bust on time-windows from 2.56 to 20.48 s duration. The best det= ection is obtained by CRT with a signal-to-noise ratio of 37.6 in the 8-120= keV energy band over a time window of 5.12 s starting at Tb.=20
The GRB localization is RA, Dec =3D 50.794, 34.439 (J2000).
The statistical uncertainty on this position is 2.3 arcminutes, to which we recommend adding 2 arcminutes of systematic uncertainty in quadrature.
An automatic slew on this position was performed by SVOM upon request by the onboard trigger.
The Space Variable Objects Monitor (SVOM) is a China-France joint mission l= ed by the Chinese National Space Administration (CNSA), French Space Agency= (CNES), and the Chinese Academy of Sciences (CAS), which is dedicated to o= bserving gamma-ray bursts and other transient phenomena in the energetic un= iverse. ECLAIRs was developed jointly by APC, CEA, CNES, and IRAP.
The SVOM point of contact for this burst is: stephane.schanne AT cea.fr
GCN Circular #37985
S.Y. Fu, S.Q. Jiang, J. An, X. Liu, Z.P. Zhu, D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report on behalf of a large collaboration:
We observed the field of GRB 241030B detected by Fermi/GBM (Fermi GBM team, GCN 37980), Swift/BAT (Klingler et al., GCN 37981), and SVOM/ECLAIRs (Zhao et al., GCN 37984), using the HMT-0.5m telescope located at Nanshan, Xinjiang, China. Observations started at 18:36:30 UT on 2024-10-30, i.e., 2.17 mins after the Swift trigger, and a series of 20 s, 40 s , 60 s, 120 s frames have been obtained without any filter.
An uncatalogued and varying optical transient (OT) is detected in our images, being consistent with the enhanced XRT position (Evans et al., GCN 37983), at coordinates (J2000)
```
R.A. = 3:23:10.26
Dec. = +34:26:49.98
```
with an uncertainty of ~ 0.5 arcsec. The OT has R ~ 19.1 mag at 8.17 mins post-trigger, calibrated with nearby PanSTARRS stars and not corrected for Galactic extinction.
Observations are ongoing.
GCN Circular #37986
Mohammad Odeh (Al-Khatim Observatory, AKO, operated by the International Astronomical Center in Abu Dhabi, UAE), and Shaikha Alshamsi, Nuha Manal Pattani, and Nidhal Guessoum (American University of Sharjah, UAE), report:
We observed the field of GRB 241030B detected by Fermi/GBM (Fermi GBM team, GCN 37980), Swift/BAT (Klingler et al., GCN 37981), and SVOM/ECLAIRs (Zhao et al., GCN 37984), with our 0.36m f/7.7 robotic telescope. The observation started on 30 October 2024 at 18:58 (UT), 24 minutes from the trigger.
We obtained multiple 180-sec exposures in Ic filter. We detected the optical afterglow at:
R.A. (J2000): 03:23:10.26
Dec. (J2000): +34:26:50.1
Our detection is consistent with the results of (Fu et al., GCN 37985).
The following observation was calculated using Atlas catalogue as a reference:
----------------------------------------------------------------------------
ObsTime (mid), Exposure (sec), Filter, Mag
----------------------------------------------------------------------------
2024-10-30T19:08:23Z, 7x180s (stacked), Ic, 18.9 +/- 0.26
----------------------------------------------------------------------------
The magnitude is not corrected for galactic extinction.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 30 Oct 24 18:41:18 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1263840,   Seg_Num: 0
POINT_RA:         50.784d {+03h 23m 08s} (J2000)
POINT_DEC:       +34.424d {+34d 25' 27"} (J2000)
ROLL:            38.032d
IMG_START_DATE:  20613 TJD;   304 DOY;   24/10/30
IMG_START_TIME:  67021.70 SOD {18:37:01.70} UT,   160.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     752006256
X_OFFSET:        843 [pixels]
Y_OFFSET:        839 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1003
Y_GRB_POS:       999
BINNING_INDEX:   1
IM_URL:          sw01263840000msuni0195.fits
SUN_POSTN:       215.47d {+14h 21m 54s}  -14.12d {-14d 07' 14"}
SUN_DIST:        155.16 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      196.97d {+13h 07m 53s}   -8.35d {-08d 20' 51"}
MOON_DIST:       139.16 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      155.30,-18.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.26, 15.33 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 30 Oct 24 18:41:31 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1263840,   Seg_Num: 0
POINT_RA:         50.784d {+03h 23m 08s} (J2000)
POINT_DEC:       +34.424d {+34d 25' 27"} (J2000)
ROLL:            38.032d
IMG_START_DATE:  20613 TJD;   304 DOY;   24/10/30
IMG_START_TIME:  67021.70 SOD {18:37:01.70} UT,   160.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     752006256
X_OFFSET:        843 [pixels]
Y_OFFSET:        839 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1003
Y_GRB_POS:       999
BINNING_INDEX:   1
IM_URL:          sw01263840000msuni0195.fits
SUN_POSTN:       215.47d {+14h 21m 54s}  -14.12d {-14d 07' 14"}
SUN_DIST:        155.16 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      196.97d {+13h 07m 53s}   -8.35d {-08d 20' 54"}
MOON_DIST:       139.16 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      155.30,-18.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       57.26, 15.33 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 30 Oct 24 18:41:21 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     1263840,   Seg_Num: 0
GRB_RA:           50.7924d {+03h 23m 10.17s} (J2000),
                  51.1844d {+03h 24m 44.24s} (current),
                  50.0052d {+03h 20m 01.25s} (1950)
GRB_DEC:         +34.4457d {+34d 26' 44.5"} (J2000),
                 +34.5327d {+34d 31' 57.7"} (current),
                 +34.2682d {+34d 16' 05.6"} (1950)
GRB_ERROR:       3.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  20613 TJD;   304 DOY;   24/10/30
IMG_START_TIME:  67029.00 SOD {18:37:09.00} UT,   168.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       215.47d {+14h 21m 54s}  -14.12d {-14d 07' 14"}
SUN_DIST:        155.14 [deg]   Sun_angle= 11.0 [hr] (West of Sun)
MOON_POSTN:      196.97d {+13h 07m 53s}   -8.35d {-08d 20' 52"}
MOON_DIST:       139.14 [deg]
MOON_ILLUM:      3 [%]
GAL_COORDS:      155.29,-18.72 [deg] galactic lon,lat of the burst
ECL_COORDS:       57.28, 15.35 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN Circular #37987
A. S. Moskvitin (SAO RAS), V. P. Goranskij (SAI MSU), A. S. Vinokurov, V. S. Shergin (SAO RAS), A. S. Pozanenko (IKI), N. Pankov (IKI, HSE) report on behalf of the GRB follow-up team.
We observed the field of GRB 241030B (Fermi GBM team, GCN 37980; Klingler et al., GCN 37981; Evans, GCN 37983; Zhao et al., GCN 37984), with the 1-m telescope of SAO RAS equipped with the CCD-photometer. We obtained a series of 300 and 600 sec. Rc images started 15 min after the trigger.
The OT (Fu et al., GCN 37985; Odeh et al., GCN 37986) is clearly detected in our frames with the following brightness:
```
R = 19.59 +/- 0.06 (18:49:32--19:00:55 UT, t_mid - T0 = 20.89 min);
R = 20.61 +/- 0.07 (19:01:33--19:45:54 UT, t_mid - T0 = 49.39 min).
```
This preliminary photometry is based on nearby PS1 stars (magnitudes converted with Lupton 2005 equations) and not corrected for the Galaxy extinction. Further observations are ongoing.
GCN Circular #37989
A. Klotz (IRAP), C. Andrade (UMN), S. Antier, I. Abdi (AUS), Y. Rajabov (UB= AI), M. Masek (FZU), E. de Bruin (UMN), M. Boer; C. Limonta (OCA), S. Karpo= v (FZU), M. Coughlin (UMN), I. Tosta e Melo (UniCT-DFA), P. Hello, N. Leroy= (IJCLAB), P-A Duverne (APC), T. Pradier (Unistra/IPHC), N. Guessoum (AUS),= M. Tanasan (NARIT), K. Noysena (NARIT), D.Turpin (CEA-Saclay/Irfu), on beh= alf of the GRANDMA collaboration:
We observed the field of GRB 241030B, detected by SWIFT (GCN 37981) and SVO= M/ECLAIRs (GCN 37984), using TAROT, TCA at Calern and TRE at La R=C3=A9unio= n observatories. Observations began 1 minute after T0 for TCA and 10 minute= s after the trigger for TRE and both without a filter.
No afterglow candidate was detected the first min with an upper limit of 16= .2 mag in r (5 sigma) and the first 15 min with an upper limit of 17.4 in r= (5 sigma). It is consistent with Nanshan/HMT detection (GCN 37985), SAO RA= S detection (GCN 37987) and AKO (GCN37986).
All the data have been reduced by a single data processing pipeline, STDPip= e (Karpov et al., 2022). We use the SkyPortal application (skyportal.io) to= monitor our observational campaign.
GRANDMA is a worldwide telescope network (grandma.ijclab.in2p3.fr) devoted = to the observation of transients in the context of multi-messenger astrophy= sics (Antier et al. 2020 MNRAS 497, 5518). Kilonova-Catcher (KNC) is the ci= tizen science program of GRANDMA (http://kilonovacatcher.in2p3.fr/).
GCN Circular #37991
R. Brivio (INAF-OAB), D.B. Malesani (DAWN/NBI and Radboud Univ.), Y.-D. Hu (INAF-OAB), P. D'Avanzo (INAF-OAB), A. Reguitti (INAF-OAB / INAF-OAPd), A. Melandri (INAF-OAR), M. Ferro (INAF-OAB), L. Tomasella (INAF -OAPd), E. Cappellaro (INAF -OAPd) report on behalf of the CIBO collaboration:
We carried out follow-up optical observations of GRB 241030B detected by Fermi (Fermi GBM team, GCN 37980), Swift (Klingler et al., GCN 37981), and SVOM/ECLAIRs (Zhao et al., GCN 37984) from the INAF - Padova Astronomical Observatory located in Asiago (Italy) with the 67/92 Schmidt telescope starting on 2024-10-30 at 20:10:31 UT (~1.6 hours after the burst) with the r- and i-sdss filters.
In our stacked images the optical afterglow (Fu et al., GCN 37985; Odeh et al., GCN 37986; Moskvitin et al., GCN 37987) is marginally detected in the i band, at the following AB magnitude:
```
i = 20.8 +/- 0.3	(calibrated against the PanSTARRS catalog)
at a mid-time of t - t0 = 1.71 hours after the trigger.
```
The source is not detected in the r band down to the following 3 sigma upper limit:
r > 21.5 (AB, calibrated against the PanSTARRS catalog) at a mid-time of t - t0 = 2.06 hours after the trigger.
GCN Circular #37992
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 1712 s of XRT Photon Counting mode data and 3 UVOT images for GRB 241030B, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 50.79245, +34.44700 which is equivalent to:
```
RA (J2000): 03h 23m 10.19s
Dec (J2000): +34d 26' 49.2"
```
with an uncertainty of 2.4 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #37995
A. S. Moskvitin, A. S. Vinokurov (SAO RAS), A. S. Pozanenko (IKI), N. Pankov (IKI, HSE) report on behalf of the GRB follow-up team.
We observed the field of GRB 241030B (Fermi GBM team, GCN 37980; Klingler et al., GCN 37981; Evans, GCN 37983; Zhao et al., GCN 37984; Evans et al., GCN 37992), with the 6-m telescope of SAO RAS equipped with the focal reducer Scorpio-I. We obtained quasi-simultaneous 16 x 30 sec images both in B and Rc bands on October 30.
The OT (Fu et al., GCN 37985; Odeh et al., GCN 37986; Brivio et al., GCN 37991; Moskvitin t al., GCN 37987) is clearly detected in the Rc stacked frame, but not presented in the B stacked frame:
```
UT_start--UT_end    t_mid - T0, h  filter  OT_mag          limit (3sigma)
20:17:39--20:43:25  1.9367         R       22.10 +/- 0.08  24.0
20:18:28--20:44:15  1.9504         B       n/d             24.0
```
This preliminary photometry is based on nearby PS1 stars (magnitudes converted with Lupton 2005 equations) and not corrected for the Galaxy extinction.
We also obtained 2 x 1200 sec spectrum with VPHG550G grism (3500--7500 AA, FWHM resolution ~ 10A) on October 30, 19:34:07--20:14:23 UT (T-mid - T0 = 1.3319 hours).
In the spectrum we do not find a continuum lower than 5200A. Due to non-detection in B filter and absence of continuum we conclude that redshift of the GRB z >~ 3.3.
GCN Circular #37996
O. Mukherjee (USRA), S. Dalessi (UAH), S. Bala (USRA) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team:
"At 18:34:20.39 UT on 30 October 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB241030B (trigger 752006065/241030774). which was also detected by Swift/BAT (N. Klingler et al. 2024, GCN 37981), and SVOM/ECLAIRs (D. Zhao et al. 2024, GCN 37984). The Fermi GBM on-ground location is consistent with the Swift/BAT position.
The angle from the Fermi LAT boresight is 54 degrees.
The GBM light curve consists of a single bright peak with a duration (T90) of about 6.8 s (50-300 keV). The time-averaged spectrum from T0-1.0 to T0+9.2 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.04 +/- 0.07 and the cutoff energy, parameterized as Epeak, is 200 +/- 20 keV.
The event fluence (10-1000 keV) in this time interval is (3.2 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+0.83 s in the 10-1000 keV band is 6.7 +/- 0.2 ph/s/cm^2.
A Band function fits the spectrum equally well with Epeak = 190 +/- 26 keV, alpha = -1.03 +/- 0.08 and beta = -2.81 +/- 1.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
GCN Circular #37998
Alan M. Watson (UNAM), S. Antier (OCA), St=C3=A9phane Basa (UAR Pytheas), William H. Lee (UNAM), Dahlia Akl (AUS), Jean-Luc Atteia (IRAP), Nathaniel R. Butler (ASU), Damien Dornic (CPPM), J.-G. Ducoin (CPPM), Francis Fortin (IRAP), Simona Lombardo (LAM), Francesco Magnani (CPPM), and Margarita Pereyra (UNAM) report:
We imaged the field of GRB 241030B detected by Fermi/GBM, Swift/BAT, Swift/XRT, and SVOM/ECLAIRs (Fermi GBM Team, GCN Circ. 37980; Klingler et al., GCN Circ. 37981; Zhao et al., GCN Circ. 37984) during the commissioning of the COLIBR=C3=8D (SVOM/F-GFT) telescope at the Observatori= o Astron=C3=B3mico Nacional on the Sierra de San Pedro M=C3=A1rtir in Mexico.
We observed with the engineering test camera in a red filter that approximates SDSS r. We observed from 2024-10-31 03:51 to 05:46 UTC (9.3 to 11.2 hours after the trigger) and obtained 5160 seconds of exposure. The data were reduced using custom software and then analyzed and calibrated against the PS1 catalog using the STDWeb service (Karpov et al., 2022).
We do not detect the optical counterpart (Fu et al., GCN Circ. 37985; Odeh et al., GCN Circ. 37986; Moskvitin et al., GCN Circ. 37987; Brivio et al., GCN Circ. 37991; Moskvitin et al., GCN Circ. 37995) with a 3-sigma limiting AB magnitude of:
r > 23.2
We warmly thank the COLIBR=C3=8D engineering team and the staff of the Observatorio Astron=C3=B3mico Nacional on the Sierra de San Pedro M=C3=A1rtir.
GCN Circular #37999
SVOM/VT commissioning team: Y. L. Qiu, H. L. Li, L. P. Xin, C. Wu, X. H. Ha= n, J. Wang, W. J. Xie, H. B. Cai, Y. Xu, Y. J. Xiao, P. P. Zhang, J. S. De= ng, L. Lan, X. M. Lu, R. S. Zhang, (NAOC), J. Zhang, L. J. Dan, G. Y. Zou,= C. J. Wang, Y. F. Du, C. Huang (XIOPM), H. Zhou (PMO).
SVOM JSWG: Jian-Yan Wei (NAOC), Bertrand Cordier (CEA), Shuang-Nan Zhang (I= HEP), St=C3=A9phane Basa (LAM), Arnaud Claret (CEA), Zi-Gao Dai (USTC), Fr= =C3=A9d=C3=A9ric Daigne (IAP), Jin-Song Deng (NAOC), Olivier Godet (IRAP), = Andrea Goldwurm (APC), Diego G=C3=B6tz (CEA), Xu-Hui Han (NAOC), Cyril Lac= haud (APC), En-Wei Liang (GXU), Yu-Lei Qiu (NAOC), Susanna Vergani (Obs.Par= is), Jing Wang (NAOC), Chao Wu (NAOC), Li-Ping Xin (NAOC), Shao-Lin Xiong = (IHEP), Bing Zhang (UNLV)
report on behalf of the SVOM team:
VT started to observe the field of GRB 241030B (Fermi GBM team, GCN 37980; = Klingler et al., GCN 37981; Evans, GCN 37983; Zhao et al., GCN 37984; Evans= et al., GCN 37992; Mukherjee et.al, GCN 37996) after the automatic slew of= the platform. The VT conducted observation in B band (400nm-650nm) channel= .
The optical counterpart (Fu et al., GCN 37985; Odeh et al., GCN 37986; Briv= io et al., GCN 37991; Moskvitin et al., GCN 37987; Moskvitin et.al GCN 3799= 5) was detected at 2024-10-30T18:39:52 in VT_B band image with a exposure t= ime of 100s . The brightness was 19.47+-0.05 mag, at a mid time of 382 s a= fter the burst.
The Space Variable Objects Monitor (SVOM) is a China-France joint mission l= ed by the Chinese National Space Administration (CNSA, China), National Cen= ter for Space Studies (CNES, France) and the Chinese Academy of Sciences (C= AS, China), which is dedicated to observing gamma-ray bursts and other tran= sient phenomena in the energetic universe. VT was jointly developed by Xi'a= n Institute of Optics and Precision Mechanics (XIOPM), CAS and National ast= ronomical observatories (NAOC),CAS.
GCN Circular #38001
H. Hagio, Y. Kubo, N. Higuchi, I. Takahashi, M. Niwano, M. Sasada, S. Hayatsu, H. Seki, S. Joshima, Y. Yatsu and N. Kawai (Science Tokyo) report on behalf of the MITSuME collaboration:
We observed the field of GRB 241030B (Fermi GBM Team, GCN 37980, Klingler et al. GCN 37981) with the optical three-color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50-cm telescope Akeno.
The observation started at 2024-10-30 18:44:33.72 UT (10.2 minutes after the Swift/BAT trigger). We stacked the images with good conditions. We did not detect any uncatalogued sources within the enhanced Swift/XRT error region(Evans et al. GCN 37992). We obtained the 5-sigma limits of the stacked images as follows.
```
T0+[min] | MID-UT | T-EXP[sec] | 5-sigma limits
------------------------------------------------------------------------------------------------
15.9 | 2024-10-30 18:50:13.75 | 480 | g'>18.7, Rc>18.6, Ic>18.1
------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the trigger
T-EXP: Total Exposure time
```
We used the PS1 catalog for flux calibration. The catalog magnitudes in PS1 g, r and i bands were converted to our g', Rc and Ic band magnitudes following Tonry et al. (2012), Table 6. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al. 2021, PASJ; https://github.com/MNiwano/Eclaire).
GCN Circular #38002
SVOM/GRM team: Wen-Jun Tan, Chen-Wei Wang, Shi-Jie Zheng, Yong-Wei Dong, Ji= ang-Tao Liu, Jian-Chao Sun, Yue Huang, Jiang He, Min Gao, Hao-Xuan Guo, Lu = Li, Yong-Ye Li, Hong-Wei Liu, Xin Liu, Hao-Li Shi, Li-Ming Song, You-Li Tuo= , Wen-Long Zhang, Hao-Xi Wang, Jin Wang, Jin-Zhou Wang, Ping Wang, Rui-Jie = Wang, Yu-Xi Wang, Yue Wang, Bo-Bing Wu, Shao-Lin Xiong, Jian-Ying Ye, Yi-Ta= o Yin, Wen-Hui Yu, Fan Zhang, Li Zhang, Peng Zhang, Shuang-Nan Zhang, Yan-Q= iu Zhang, Yan-Ting Zhang, Shu-Min Zhao, Xiao-Yun Zhao, Chao Zheng (IHEP), M= aria-Grazia Bernardini (LUPM/INAF-OAB), Laurent Bouchet (IRAP), David Corre= (CEA), Tais Maiolino (LUPM), Fr=C3=A9d=C3=A9ric Piron (LUPM), St=C3=A9phan= e Schanne (CEA), Jingwei Wang (IAP), JeanLuc Att=C3=A9ia (IRAP)
SVOM JSWG: Jian-Yan Wei (NAOC), Bertrand Cordier (CEA), Shuang-Nan Zhang (I= HEP), St=C3=A9phane Basa (LAM), Arnaud Claret (CEA), Zi-Gao Dai (USTC), Fr= =C3=A9d=C3=A9ric Daigne (IAP), Jin-Song Deng (NAOC), Olivier Godet (IRAP), = Andrea Goldwurm (APC), Diego G=C3=B6tz (CEA), Xu-Hui Han (NAOC), Cyril Lac= haud (APC), En-Wei Liang (GXU), Yu-Lei Qiu (NAOC), Susanna Vergani (Obs.Par= is), Jing Wang (NAOC), Chao Wu (NAOC), Li-Ping Xin (NAOC), Shao-Lin Xiong = (IHEP), Bing Zhang (UNLV)
report on behalf of the SVOM team:
During the commissioning phase, the SVOM/GRM was triggered in-flight by GRB= 241030B at 2024-10-30T18:34:22.000 UT (T0), which was also observed by Fer= mi/GBM (Fermi GBM team, GCN 37980), Swift/BAT (Klingler et al, GCN 37981), = Swift/XRT (Evans et al, GCN 37983) and SVOM/ECLAIRs (Zhao et al, GCN=C2=A03= 7984).
The real-time alert data and light curves of SVOM/GRM were downlinked to th= e ground through the VHF system with low latency. With the event-by-event d= ata downloaded through the X-band ground station, the GRM light curve shows= that this burst consists of a single pulse with a T90 of 6.8 +1.5/-0.5 s. = The SVOM/GRM on-ground position is consistent with the SVOM/ECLAIRs on-boar= d localization.
The GRM light curve can be found here: https://www.bursthub.cn//admin/static/svgrb241030B.png
This burst is located at about 29.4 degrees from the SVOM optical axis.
The Space Variable Objects Monitor (SVOM) is a China-France joint mission l= ed by the Chinese National Space Administration (CNSA, China), National Cen= ter for Space Studies (CNES, France) and the Chinese Academy of Sciences (C= AS, China), which is dedicated to observing gamma-ray bursts and other tran= sient phenomena in the energetic universe. GRM is developed by the Institut= e of High Energy Physics (IHEP) of CAS.
The SVOM point of contact for this burst is: Wen-Jun Tan (IHEP)(tanwj@ihep.= ac.cn)

GCN Circular #38003
V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko, G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij (Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),
D. Buckley (South African Astronomical Observatory),
O.A. Gress, N.M. Budnev, O.Ershova (Irkutsk State University, API),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich (Blagoveschensk Educational State University)
MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was pointed to the Swift GRB241030.77 (trigger No 1263840,03h 23m 09.12s , +34d 25m 55.2s, R=0.05) errorbox 4568 sec after notice time and 4618 sec after trigger time at 2024-10-30 19:51:19 UT, with upper limit up to 20.2 mag. The observations began at zenith distance = 83 deg. The sun altitude is -31.5 deg.
MASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB241030.77 errorbox 5497 sec after notice time and 5547 sec after trigger time at 2024-10-30 20:06:48 UT, with upper limit up to 20.3 mag. The observations began at zenith distance = 23 deg. The sun altitude is -59.3 deg.
MASTER-OAFA robotic telescope located in Argentina (OAFA observatory of San Juan National University) was pointed to the Swift GRB241030.77 errorbox 26948 sec after notice time and 26998 sec after trigger time at 2024-10-31 02:04:19 UT, with upper limit up to 20.1 mag. The observations began at zenith distance = 80 deg. The sun altitude is -34.6 deg.
The galactic latitude b = -18 deg., longitude l = 156 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2654125
We obtain a following upper limits.

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

    4708 |         MASTER-SAAO |   C |   180 | 17.9 |        
    4907 |         MASTER-SAAO |   C |   180 | 18.1 |        
    5106 |         MASTER-SAAO |   C |   180 | 18.2 |        
    5311 |         MASTER-SAAO |   C |   180 | 18.3 |        
    5510 |         MASTER-SAAO |   C |   180 | 18.3 |        
    5818 |   MASTER-Kislovodsk |   C |   540 | 19.9 |  Coadd 
    6988 |   MASTER-Kislovodsk |   C |  2880 | 20.3 |  Coadd 
    5709 |         MASTER-SAAO |   C |   180 | 18.5 |        
    5909 |         MASTER-SAAO |   C |   180 | 18.6 |        
    6108 |         MASTER-SAAO |   C |   180 | 18.6 |        
    6417 |   MASTER-Kislovodsk |   C |   540 | 19.9 |  Coadd 
    6308 |         MASTER-SAAO |   C |   180 | 18.6 |        
    6682 |         MASTER-SAAO |   C |   180 | 19.1 |        
    6862 |         MASTER-SAAO |   C |   540 | 19.8 |  Coadd 
    6881 |         MASTER-SAAO |   C |   180 | 19.2 |        
    7222 |   MASTER-Kislovodsk |   C |   540 | 19.7 |  Coadd 
    7080 |         MASTER-SAAO |   C |   180 | 19.4 |        
    7280 |         MASTER-SAAO |   C |   180 | 19.3 |        
    7460 |         MASTER-SAAO |   C |   540 | 19.9 |  Coadd 
    7479 |         MASTER-SAAO |   C |   180 | 19.3 |        
    7822 |   MASTER-Kislovodsk |   C |   540 | 19.8 |  Coadd 
    7678 |         MASTER-SAAO |   C |   180 | 19.4 |        
    7901 |         MASTER-SAAO |   C |   180 | 18.3 |        
    8100 |         MASTER-SAAO |   C |   180 | 18.6 |        
    8299 |         MASTER-SAAO |   C |   180 | 19.0 |        
    8479 |         MASTER-SAAO |   C |   540 | 19.7 |  Coadd 
    9109 |         MASTER-SAAO |   C |  1800 | 20.2 |  Coadd 
    8622 |   MASTER-Kislovodsk |   C |   540 | 19.6 |  Coadd 
    8498 |         MASTER-SAAO |   C |   180 | 19.1 |        
    8697 |         MASTER-SAAO |   C |   180 | 19.1 |        
    8903 |         MASTER-SAAO |   C |   180 | 19.3 |        
    9083 |         MASTER-SAAO |   C |   540 | 19.8 |  Coadd 
    9221 |   MASTER-Kislovodsk |   C |   540 | 19.8 |  Coadd 
    9102 |         MASTER-SAAO |   C |   180 | 19.4 |        
    9301 |         MASTER-SAAO |   C |   180 | 19.3 |        
    9500 |         MASTER-SAAO |   C |   180 | 19.3 |        
    9680 |         MASTER-SAAO |   C |   540 | 19.9 |  Coadd 
    9700 |         MASTER-SAAO |   C |   180 | 19.3 |        
   10020 |   MASTER-Kislovodsk |   C |   540 | 19.8 |  Coadd 
    9899 |         MASTER-SAAO |   C |   180 | 19.3 |        
   10099 |         MASTER-SAAO |   C |   180 | 19.4 |        
   10279 |         MASTER-SAAO |   C |   540 | 19.9 |  Coadd 
   10298 |         MASTER-SAAO |   C |   180 | 19.4 |        
   10620 |   MASTER-Kislovodsk |   C |   540 | 19.8 |  Coadd 
   10497 |         MASTER-SAAO |   C |   180 | 19.5 |        
   10696 |         MASTER-SAAO |   C |   180 | 19.4 |        
   11419 |   MASTER-Kislovodsk |   C |   540 | 19.8 |  Coadd 
   11718 |         MASTER-SAAO |   C |    60 | 19.1 |        
   11945 |         MASTER-SAAO |   C |   180 | 19.4 |        
   12085 |         MASTER-SAAO |   C |    60 | 19.2 |        
   12419 |   MASTER-Kislovodsk |   C |   540 | 19.8 |  Coadd 
   12251 |         MASTER-SAAO |   C |    60 | 19.1 |        
   12418 |         MASTER-SAAO |   C |    60 | 19.0 |        
   12590 |         MASTER-SAAO |   C |    60 | 19.1 |        
   13073 |         MASTER-SAAO |   C |    60 | 19.1 |        
   13212 |         MASTER-SAAO |   C |   180 | 19.4 |        
   13756 |         MASTER-SAAO |   C |    60 | 18.6 |        
   13921 |         MASTER-SAAO |   C |    60 | 18.7 |        
   14088 |         MASTER-SAAO |   C |    60 | 18.7 |        
   14255 |         MASTER-SAAO |   C |    60 | 18.6 |        
   14480 |         MASTER-SAAO |   C |   180 | 18.1 |        
   14619 |         MASTER-SAAO |   C |    60 | 18.8 |        
   14786 |         MASTER-SAAO |   C |    60 | 18.7 |        
   14953 |         MASTER-SAAO |   C |    60 | 18.8 |        
   15120 |         MASTER-SAAO |   C |    60 | 18.7 |        
   15278 |         MASTER-SAAO |   C |    60 | 18.8 |        
   15437 |         MASTER-SAAO |   C |    60 | 18.8 |        
   15595 |         MASTER-SAAO |   C |    60 | 18.9 |        
   15735 |         MASTER-SAAO |   C |   180 | 18.4 |        
   15953 |         MASTER-SAAO |   C |    60 | 18.9 |        
   16117 |         MASTER-SAAO |   C |    60 | 18.9 |        
   16276 |         MASTER-SAAO |   C |    60 | 18.9 |        
   16673 |         MASTER-SAAO |   C |    60 | 19.0 |        
   16752 |         MASTER-SAAO |   C |    60 | 18.7 |        
   16970 |         MASTER-SAAO |   C |   180 | 18.8 |        
   17506 |         MASTER-SAAO |   C |    60 | 19.1 |        
   18200 |         MASTER-SAAO |   C |   180 | 19.0 |        
   18498 |         MASTER-SAAO |   C |    60 | 19.1 |        
   18577 |         MASTER-SAAO |   C |    60 | 18.8 |        
   19430 |         MASTER-SAAO |   C |   180 | 19.3 |        
   19736 |         MASTER-SAAO |   C |    60 | 19.0 |        
   20212 |         MASTER-SAAO |   C |    60 | 19.0 |        
   20675 |         MASTER-SAAO |   C |   180 | 19.3 |        
   20901 |         MASTER-SAAO |   C |    60 | 18.8 |        
   21456 |         MASTER-SAAO |   C |    60 | 19.1 |        
   21535 |         MASTER-SAAO |   C |    60 | 19.0 |        
   21912 |         MASTER-SAAO |   C |   180 | 19.5 |        
   22210 |         MASTER-SAAO |   C |    60 | 19.0 |        
   22385 |         MASTER-SAAO |   C |    60 | 19.0 |        
   22543 |         MASTER-SAAO |   C |    60 | 18.9 |        
   23163 |         MASTER-SAAO |   C |   180 | 19.3 |        
   23302 |         MASTER-SAAO |   C |    60 | 18.7 |        
   23544 |         MASTER-SAAO |   C |    60 | 18.4 |        
   23786 |         MASTER-SAAO |   C |    60 | 18.6 |        
   24405 |         MASTER-SAAO |   C |   180 | 18.7 |        
   24544 |         MASTER-SAAO |   C |    60 | 18.3 |        
   24948 |         MASTER-SAAO |   C |    60 | 18.3 |        
   25349 |         MASTER-SAAO |   C |    60 | 18.5 |        
   25656 |         MASTER-SAAO |   C |   180 | 18.5 |        
   25960 |         MASTER-SAAO |   C |    60 | 18.3 |        
   26204 |         MASTER-SAAO |   C |    60 | 18.5 |        
   26947 |         MASTER-SAAO |   C |   180 | 18.4 |        
   27029 |         MASTER-OAFA |   C |    60 | 18.3 |        
   27089 |         MASTER-OAFA |   C |   180 | 19.1 |  Coadd 
   27094 |         MASTER-OAFA |   C |    60 | 18.4 |        
   27159 |         MASTER-OAFA |   C |    60 | 18.5 |        
   27374 |         MASTER-SAAO |   C |    60 | 18.1 |        
   27820 |         MASTER-SAAO |   C |    60 | 18.1 |        
   28326 |         MASTER-SAAO |   C |   180 | 17.9 |        
   29882 |         MASTER-OAFA |   C |    60 | 19.0 |        
   29947 |         MASTER-OAFA |   C |    60 | 19.0 |        
   30012 |         MASTER-OAFA |   C |    60 | 18.9 |        
   31511 |         MASTER-OAFA |   C |    20 | 19.4 |        
   31531 |         MASTER-OAFA |   C |    60 | 20.0 |  Coadd 
   31536 |         MASTER-OAFA |   C |    20 | 19.4 |        
   31561 |         MASTER-OAFA |   C |    20 | 19.3 |        
   32791 |         MASTER-OAFA |   C |    60 | 19.9 |        
   32857 |         MASTER-OAFA |   C |    60 | 19.9 |        
   34365 |         MASTER-OAFA |   C |    20 | 19.5 |        
   34385 |         MASTER-OAFA |   C |    60 | 20.1 |  Coadd 
   34390 |         MASTER-OAFA |   C |    20 | 19.6 |        
   34415 |         MASTER-OAFA |   C |    20 | 19.5 |        
   35646 |         MASTER-OAFA |   C |    60 | 20.0 |        
   35711 |         MASTER-OAFA |   C |    60 | 20.0 |        
   36855 |         MASTER-OAFA |   C |    60 | 19.5 |        
   36920 |         MASTER-OAFA |   C |    60 | 19.4 |        
   38161 |         MASTER-OAFA |   C |    20 | 19.5 |        
   38181 |         MASTER-OAFA |   C |    60 | 20.0 |  Coadd 
   38186 |         MASTER-OAFA |   C |    20 | 19.4 |        
   38211 |         MASTER-OAFA |   C |    20 | 19.5 |        
   39471 |         MASTER-OAFA |   C |    60 | 19.4 |        
   39531 |         MASTER-OAFA |   C |   180 | 19.8 |  Coadd 
   39536 |         MASTER-OAFA |   C |    60 | 19.2 |        
   39602 |         MASTER-OAFA |   C |    60 | 19.5 |        
   40745 |         MASTER-OAFA |   C |    60 | 19.4 |        
   40805 |         MASTER-OAFA |   C |   180 | 19.8 |  Coadd 
   40810 |         MASTER-OAFA |   C |    60 | 19.3 |        
   40876 |         MASTER-OAFA |   C |    60 | 19.3 |        
   43218 |         MASTER-OAFA |   C |    60 | 19.7 |        
   43278 |         MASTER-OAFA |   C |   180 | 20.1 |  Coadd 
   43283 |         MASTER-OAFA |   C |    60 | 19.8 |        
   43348 |         MASTER-OAFA |   C |    60 | 19.6 |        
   47819 |         MASTER-OAFA |   C |    20 | 18.2 |        
   47844 |         MASTER-OAFA |   C |    20 | 18.1 |        
   47870 |         MASTER-OAFA |   C |    20 | 17.4 |        
   49222 |         MASTER-OAFA |   C |    60 | 18.7 |        
   49282 |         MASTER-OAFA |   C |   180 | 19.4 |  Coadd 
   49282 |         MASTER-OAFA |   C |   180 | 19.4 |  Coadd 
   49287 |         MASTER-OAFA |   C |    60 | 18.9 |        
   49353 |         MASTER-OAFA |   C |    60 | 19.0 |        
   50811 |         MASTER-OAFA |   C |    60 | 17.8 |        
   50871 |         MASTER-OAFA |   C |   180 | 18.0 |  Coadd 
   50876 |         MASTER-OAFA |   C |    60 | 17.7 |        
   50942 |         MASTER-OAFA |   C |    60 | 17.6 |

Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.

GCN Circular #38004
N. R. Tanvir (U. Leicester), C. C. Thoene (ASU-CAS, AbAO), J. P. U. Fynbo (= DAWN/NBI), A. de Ugarte Postigo (LAM/OCA, CNRS), L. Izzo (INAF-OACn & DARK/= NBI), D. B. Malesani (DAWN/NBI and Radboud Univ.), A. Martin-Carrillo (UCD)= , J. F. Agui Fernandez (CAHA), G. Lombardi (GTC), S. Geier (GTC) and G. G= =C3=B3mez Velarde (GTC) report:
We observed the optical counterpart (Fu et al., GCN 37985) of GRB 241030B (= Fermi GBM team, GCN 37980; Klingler et al., GCN 37981; Zhao et al., GCN 379= 84) using OSIRIS+ on the 10.4 m GTC telescope, at the Roque de los Muchacho= s Observatory (La Palma, Spain). The observation consisted of 4 spectra of = 1200 s each, obtained with grism R1000B, covering the spectral range betwee= n 3650 and 7800 AA, at a resolving power of 600.
The acquisition image, obtained on 2024-10-31 at 02:42:33 UT, 8.14 hr since= the trigger, shows the afterglow at r(AB) =3D 23.53 +/- 0.12 mag, as compa= red to Pan-STARRS field stars.
The spectrum shows a faint continuum over the complete spectral range, though a drop in flux is observed blueward of ~4700 AA, suggesting the onset of the Lyman-alpha forest. No clear DLA trough is visible, but several, low S/N absorption features are present to the red of the drop, which we tentatively interpret as Si II 1526, Si IV 1393, C IV 1548,1550 (blended), Al II 1670, Al III 1854,1862 at z = 2.82, which we propose as the redshift of GRB 241030B.
GCN Circular #38008
A. A. Breeveld (UCL-MSSL) and N. J. Klingler (GSFC/UMBC/CRESSTII) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 241030B 162 s= after the BAT trigger (Klingler et al., GCN Circ. 37981). The optical counterpart (Fu et al., GCN Circ. 37985; Odeh et al., GCN Circ. 37986; Moskvitin et al., GCN Circ. 37987; Brivio et al., GCN Circ. 37991; Moskvitin et.al GCN Circ. 37995 and Qui et al. GCN Circ. 37999) is detecte= d in the initial UVOT exposure in the white filter only.
Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white              162          538          167         21.00 =C2=B1 0.30
v                  395         4817          255        >19.4
b                  494          857           58        >19.3
u                  469         5380          203        >20.2
w1                 444         5228          255        >21.1
m2                4822         5021          197        >19.7
w2                 371         4612          255        >19.8
```
The magnitudes in the table are not corrected for the Galactic extinction d= ue to the reddening of E(B-V) =3D 0.204 in the direction of the burst (Schl= egel et al. 1998).
GCN Circular #38011
S. Laha (GSFC/UMBC), S. D. Barthelmy (GSFC), R. Gupta (GSFC), N. J. Klingler (GSFC/UMBC/CRESSTII), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), M. J. Moss (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC), D. Sadaula (GSFC/UMBC), T. Sakamoto (AGU) (i.e. the Swift-BAT team): Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 241030B (trigger #1263840) (Klingler, et al., GCN Circ. 37981). The BAT ground-calculated position is RA, Dec = 50.787, 34.439 deg which is
```
   RA(J2000)  =  03h 23m 08.8s
   Dec(J2000) = +34d 26' 21.9"
```
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 11%. The mask-weighted light curve shows a single-pulse structure that starts at T-2 sec, peaks at T+1 sec, and ends at T+9 sec. T90 (15-350 keV) is 6.7 +- 1.6 sec (estimated error including systematics). The time-averaged spectrum from T-1.58 to T+7.10 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.40 +- 0.16. The fluence in the 15-150 keV band is 1.2 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.68 sec in the 15-150 keV band is 3.2 +- 0.6 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at https://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1263840
GCN Circular #38012
R. Strausbaugh (Eastern Illinois University), A. Cucchiara (NASA) report on behalf of a larger collaboration:
We observed the Fermi/Swift GRB 241030B field (Fermi GBM Team, GCN 37980; Klingler et al., GCN 37981) with the LCOGT 1-meter Sinistro instrument at the Teide Observatory, Tenerife site, on October 30, from 21:50 to 22:22 UT (corresponding to 3.27 to 3.8 hours after the GRB trigger time) with the sdss r and i filters.
We performed a series of 3x300s exposures in i- and r-bands. We do not detect a source within the enhanced Swfit XRT error region (Evans et al., GCN 37983) in either band. This result is consistent with fading from early optical detections (Fu et al., GCN 37985; Odeh et al, GCN 37986; Moskvitin et al., GCN 37987, Brivio et al., GCN 37991; Moskvitin et al., GCN 37995; Qiu et al., GCN 37999; Tanvir et al., GCN 38004; Breeveld et al., GCN 38008) and other optical upper limits (Klotz et al., GCN 37989; Hagio et al., GCN 38001).
The following 5-sigma upper limits are calculated using the PanSTARRS catalog as reference:
```
r > 22.5
i > 22.0
```
These magnitudes are not corrected for galactic extinction.
GCN Circular #38013
V. Swain, A.P. Saikia, T. Mohan, R. Kumar, V. Bhalerao (IITB), G.C. Anupama, S. Barway (IIA) and K. Angail (IAO) report on behalf of the GIT team:
We observed the field of GRB 241030B (Fermi GBM Team, GCN 37980, Klingler et al. GCN 37981) with 0.7m GROWTH-India Telescope (GIT) in g', r', and i' filters. We started the observation at 2024-10-30 18:42:39 UT, i.e., 8.3 mins after the Fermi GBM trigger. We took multiple exposures and obtained upper limits at the position reported by Fu et. al., (GCN 37985). The photometry results follow as:
```
------------------------------------------------------------------------------
| JD (mid)          | t-t0 (mins) | Filter | Exposure (s) | Upper limit (AB) | 
| ----------------- | ----------- |------- | ------------ | --------------   |
| 2460614.279618055 |    8.32     |   r'   |   20         |       18.9       |
| 2460614.281053241 |    10.38    |   g'   |   20         |       18.7       |
| 2460614.282048611 |    11.82    |   i'   |   30         |       18.0       |
| 2460614.434398148 |    231.2    |   g'   |   440        |       21.2       |
| 2460614.439745370 |    238.9    |   r'   |   440        |       21.3       |
| 2460614.445185185 |    246.7    |   i'   |   400        |       20.2       |
------------------------------------------------------------------------------
```
Our results are consistent with Fu et al.; (GCN 37985), Odeh et al.; (GCN 37986), Moskvitin et al.; (GCN 37987), Brivio et al.; (GCN 37991), Moskvitin et al.; (GCN 37995), Watson et al.; (GCN 37998), Qiu et al.; (GCN 37999), Hagio et al.; (GCN 38001), Tanvir et. al.; (GCN 38004), Breeveld et. al.; (GCN 38008), Strausbaugh et. al.; (GCN 38012).
The measurement is calibrated against PanSTARRS DR1 (Chambers et al., 2016) and not corrected for Galactic extinction.
The GROWTH India Telescope (GIT; Kumar et al. 2022) is a 70-cm telescope with a 0.7-degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports the operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/.
GCN Circular #38020
S. Leonini, M. Conti, P. Rosi, L.M. Tinjaca Ramirez (Montarrenti Observatory, Siena, Italy, part of UAI/SSV-GRB section), M.G. Dainotti (National Astronomical Observatory of Japan), Y. Niino (Tokyo University, Institute of Astronomy), K. Kalinowski (Aarhus University, Department of Physics and Astronomy) and B. De Simone (Universita' degli Studi Di Salerno) report:
We performed follow-up observations of the field of GRB 241030B with the automated and remoted 0.53m Ritchey-Chretien telescope at Montarrenti Observatory (Siena, Italy, IAU code C88).
Observations were started at 2024-10-30 21:55:28 UT, 3.33 hours after burst (Fermi-GBM team, GCN 37980; Swift trigger 1263840, GCN 37981 Klingler et al.; SVOM/ECLAIRs, GCN 37984 Zhao et al.) stacking 140x40s Rc-band CCD images.
In our preliminary analysis, we have not found any optical transient candidate within the error-box (2.4 arcmin.) of the Neil Gehrels Swift Observatory enhanced position (RA 03h 23m 10.19s, Dec. +34d 26m 49.2s - J2000) down to the following 3-sigma optical upper limits:
```
   MJD           Exp.    Filter       UL (3-sigma)     
60614.4476     140x40s     Rc          >  20.91
```
Magnitude was calibrated with the nearby PanSTARRS stars converted using Lupton (2005) equations. No correction for galactic dust extinction was applied.
Our observations are consistent with other fading detection and upper limits already reported (Fu et al., GCN 37985; Odeh et al., GCN 37986; Moskvitin et al., GCN 37987; Klotz et al., GCN 37989; Brivio et al., GCN 37991; Moskvitin et al., GCN 37995; Watson et al., GCN 37998; Qiu et al., GCN 37999; Hagio et al., GCN 38001; Tanvir et. al., GCN 38004; Strausbaugh et. al., GCN 38012; Swain et al., GCN 38013).
GCN Circular #38023
Zh. Abdullayev (NU), Zh. Maksut (NU), T. Komesh (NU), B. Grossan (UCB, NU), D. Berdikhan (NU), M. Krugov (FAI) and E. Abdikamalov (NU) report on behalf of the Energetic Cosmos Laboratory:
The Nazarbayev University Transient Telescope at Assy-Turgen Astrophysical Observatory (NUTTelA-TAO) observed the field of GRB 241030B observing in Sloan g' and r' bands, with the Burst Simultaneous Three-Channel Imager (BSTI; Grossan, Kumar & Smoot 2019, JHEA, 32, 14).
We started observations at 20:15:59 UT on 2024-10-30, 1.7 h after the BAT trigger. Observations were made in partly cloudy conditions. No source consistent with the XRT (P.A. Evans 2024, GCN Circ. 37983) was detected. We report the following results:
```
start time  t-t0(s)  end time    UL g'   UL r'  exposure_time (s)
-----------------------------------------------------------------
20:15:59     6100    20:16:59    19.2    19.0     60
```
start time is in UT. t-t0(s) gives the time since trigger, in seconds. UL g' and UL r' give the 5 sigma upper limit sensitivity in magnitudes, for images co-added to the given exposure time. The results in in the table corresponds to co-adds of an initial short exposure image sequence of 0.5 s (these sub-second exposures are read-noise suppressed by our EMCCD cameras, with high gain electron multiplication active). Calibration was done with the 3 bright Pan-STARRS catalog stars on our images.
```
----------------------------------
NU = Nazarbayev University, Astana, Kazakhstan
UCB = University of California, Berkeley, USA
FAI = Fesenkov Astrophysical Institute, Kazakhstan
```
This research has been funded by the Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan (Grant No. AP14870504). The NUTTelA-TAO Team acknowledges the support of the staff of the Assy-Turgen Astrophysical Observatory, Almaty, Kazakhstan, and the Fesenkov Astrophysical Institute, Almaty, Kazkhstan.
GCN Circular #38024
Zh. Abdullayev (NU), Zh. Maksut (NU), T. Komesh (NU), B. Grossan (UCB, NU), D. Berdikhan (NU), M. Krugov (FAI) and E. Abdikamalov (NU) report on behalf of the Energetic Cosmos Laboratory:
The Nazarbayev University Transient Telescope at Assy-Turgen Astrophysical Observatory (NUTTelA-TAO) observed the field of GRB 241030B observing in Sloan g' and r' bands, with the Burst Simultaneous Three-Channel Imager (BSTI; Grossan, Kumar & Smoot 2019, JHEA, 32, 14).
We started observations at 20:15:59 UT on 2024-10-30, 1.7 h after the BAT trigger. Observations were made in partly cloudy conditions. No source consistent with the XRT (P.A. Evans 2024, GCN Circ. 37983) was detected. We report the following results:
```
start time  t-t0(s)  end time    UL g'   UL r'  exposure_time (s)
-----------------------------------------------------------------
20:15:59     6100    20:16:59    19.2    19.0     60
```
start time is in UT. t-t0(s) gives the time since trigger, in seconds. UL g' and UL r' give the 5 sigma upper limit sensitivity in magnitudes, for images co-added to the given exposure time. The results in in the table corresponds to co-adds of an initial short exposure image sequence of 0.5 s (these sub-second exposures are read-noise suppressed by our EMCCD cameras, with high gain electron multiplication active). Calibration was done with the 3 bright Pan-STARRS catalog stars on our images.
```
----------------------------------
NU = Nazarbayev University, Astana, Kazakhstan
UCB = University of California, Berkeley, USA
FAI = Fesenkov Astrophysical Institute, Kazakhstan
```
This research has been funded by the Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan (Grant No. AP14870504). The NUTTelA-TAO Team acknowledges the support of the staff of the Assy-Turgen Astrophysical Observatory, Almaty, Kazakhstan, and the Fesenkov Astrophysical Institute, Almaty, Kazkhstan.
GCN Circular #38029
P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
We have analysed 5.6 ks of XRT data for GRB 241030B, from 168 s to 51.2 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode.
The light curve can be modelled with a power-law decay with a decay index of alpha=1.17 (+/-0.07).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.00 (+0.31, -0.28). The best-fitting absorption column is 2.9 (+1.3, -0.9) x 10^21 cm^-2, consistent with the Galactic value of 2.0 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.8 x 10^-11 (5.5 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.9 (+1.3, -0.9) x 10^21 cm^-2
Galactic foreground: 2.0 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     2.00 (+0.31, -0.28)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01263840.
This circular is an official product of the Swift-XRT team.
GCN Circular #38158
R. Jayaraman (MIT), M.M. Fausnaugh (TTU), and G.R. Ricker (MIT) report:
The Transiting Exoplanet Survey Satellite (TESS; Ricker et al. JATIS 1 2015) observed GRB 241030B (Klingler et al., GCN 37981; Fermi GBM Team, GCN 37980) during its scheduled sky survey. TESS observed this region continuously from 3.72 days before the trigger to 2.71 days after the trigger, at a cadence of 200 seconds. The GRB occurred during TESS observational Sector 85, and the localization fell within Camera 1, CCD 4.
We performed forced difference-imaging photometry at the location of the confirmed X-ray afterglow (Evans et al., GCN 37992) using the full-frame images from the publicly available TICA data archived at MAST (https://archive.stsci.edu/hlsp/tica). Our data reduction routine is described in Fausnaugh et al. 2023 (ApJ 956(2):108).
We detect an optical transient at the location of the GRB in the 3 exposures during and after the time of trigger from Klingler et al. The trigger occurred 115 seconds before the end of a concurrent 200-second TESS exposure. The optical transient has a magnitude of 16.40 =C2=B1 0.14 in the TESS band in this image. The magnitude falls to 16.50 =C2=B1 0.15 in the next exposure, and then 17.08 =C2=B1 0.25 mag in the third exposure. These values are in line with the upper limits of 16.2 (r) at T0+1 min, and 17.4 at T0+15 min from Klotz et al., GCN 37989.
This circular includes data collected with the TESS mission, obtained from the MAST data archive at the Space Telescope Science Institute (STScI). Funding for the TESS mission is provided by the NASA Explorer Program. STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.

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Jochen Greiner, last update: 10-Nov-2024 [Disclaimer]