Gamma-ray Burst 241115A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Nov 24 13:18:48 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1267921,   Seg_Num: 0
GRB_RA:           86.765d {+05h 47m 04s} (J2000),
                  87.082d {+05h 48m 20s} (current),
                  86.128d {+05h 44m 31s} (1950)
GRB_DEC:          -0.662d {-00d 39' 44"} (J2000),
                  -0.655d {-00d 39' 17"} (current),
                  -0.680d {-00d 40' 46"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3356 [cnts]    Image_Peak=470 [image_cnts]
TRIGGER_DUR:     0.512 [sec] 
TRIGGER_INDEX:   470     E_range: 25-100 keV
BKG_INTEN:       16962 [cnts]
BKG_TIME:        47893.46 SOD {13:18:13.46} UT
BKG_DUR:         8 [sec]
GRB_DATE:        20629 TJD;   320 DOY;   24/11/15
GRB_TIME:        47905.04 SOD {13:18:25.04} UT
GRB_PHI:         136.55 [deg]
GRB_THETA:        20.87 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     61.83 [sigma]
IMAGE_SIGNIF:    18.15 [sigma]
MERIT_PARAMS:     +1  +0  +0  -1  +2  +5  +0  +0 +76  +0 
SUN_POSTN:       231.29d {+15h 25m 09s}  -18.69d {-18d 41' 16"}
SUN_DIST:        139.88 [deg]   Sun_angle= 9.6 [hr] (West of Sun)
MOON_POSTN:       45.44d {+03h 01m 45s}  +20.86d {+20d 51' 24"}
MOON_DIST:        46.04 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      206.04,-14.59 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       86.46,-24.06 [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 = 204.63,-19.65 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=753369509).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 15 Nov 24 13:18:54 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      49
TRIGGER_NUM:     753369509
GRB_RA:           90.733d {+06h 02m 56s} (J2000),
                  91.065d {+06h 04m 16s} (current),
                  90.067d {+06h 00m 16s} (1950)
GRB_DEC:          +5.250d {+05d 15' 00"} (J2000),
                  +5.248d {+05d 14' 52"} (current),
                  +5.252d {+05d 15' 07"} (1950)
GRB_ERROR:       6.67 [deg radius, statistical plus systematic]
GRB_INTEN:       373 [cnts/sec]
DATA_SIGNIF:     19.40 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        20629 TJD;   320 DOY;   24/11/15
GRB_TIME:        47904.73 SOD {13:18:24.73} UT
GRB_PHI:         243.00 [deg]
GRB_THETA:        40.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      1.19
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   1%  Generic SGR
DETECTORS:       0,0,0, 0,0,0, 0,1,1, 0,0,0, 0,0,
SUN_POSTN:       231.29d {+15h 25m 10s}  -18.69d {-18d 41' 16"}
SUN_DIST:        138.96 [deg]   Sun_angle= 9.3 [hr] (West of Sun)
MOON_POSTN:       45.44d {+03h 01m 45s}  +20.86d {+20d 51' 25"}
MOON_DIST:        46.90 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      202.64, -8.31 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       90.77,-18.19 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241115554/quicklook/glg_lc_medres34_bn241115554.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 169.32,1.80 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the SWIFT_BAT event (trignum=1267921).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 15 Nov 24 13:19:12 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      60
TRIGGER_NUM:     753369509
GRB_RA:           84.250d {+05h 37m 00s} (J2000),
                  84.571d {+05h 38m 17s} (current),
                  83.606d {+05h 34m 25s} (1950)
GRB_DEC:          +0.790d {+00d 47' 24"} (J2000),
                  +0.803d {+00d 48' 13"} (current),
                  +0.761d {+00d 45' 38"} (1950)
GRB_ERROR:       4.25 [deg radius, statistical only]
DATA_SIGNIF:     25.00 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        20629 TJD;   320 DOY;   24/11/15
GRB_TIME:        47904.73 SOD {13:18:24.73} UT
GRB_PHI:         234.00 [deg]
GRB_THETA:        45.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       231.29d {+15h 25m 10s}  -18.69d {-18d 41' 16"}
SUN_DIST:        142.78 [deg]   Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN:       45.44d {+03h 01m 46s}  +20.86d {+20d 51' 29"}
MOON_DIST:        43.13 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      203.48,-16.12 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       83.77,-22.53 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241115554/quicklook/glg_lc_medres34_bn241115554.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_753369509.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(1.0<100sec) coincident with the SWIFT_BAT event (trignum=1267921).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 15 Nov 24 13:27:44 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     753369509
GRB_RA:           85.210d {+05h 40m 50s} (J2000),
                  85.535d {+05h 42m 08s} (current),
                  84.557d {+05h 38m 14s} (1950)
GRB_DEC:          +2.690d {+02d 41' 24"} (J2000),
                  +2.701d {+02d 42' 04"} (current),
                  +2.665d {+02d 39' 55"} (1950)
GRB_ERROR:       6.02 [deg radius, statistical only]
GRB_DATE:        20629 TJD;   320 DOY;   24/11/15
GRB_TIME:        47904.73 SOD {13:18:24.73} UT
GRB_PHI:         235.00 [deg]
GRB_THETA:        43.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       231.30d {+15h 25m 11s}  -18.69d {-18d 41' 22"}
SUN_DIST:        142.88 [deg]   Sun_angle= 9.7 [hr] (West of Sun)
MOON_POSTN:       45.53d {+03h 02m 07s}  +20.89d {+20d 53' 16"}
MOON_DIST:        42.98 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      202.23,-14.37 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       84.89,-20.66 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241115554/quicklook/glg_lc_medres34_bn241115554.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241115554/quicklook/glg_locplot_all_bn241115554.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(1.0<100sec) coincident with the SWIFT_BAT event (trignum=1267921).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Nov 24 13:20:20 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     1267921,   Seg_Num: 0
POINT_RA:         86.766d {+05h 47m 04s} (J2000)
POINT_DEC:        -0.655d {-00d 39' 16"} (J2000)
IMG_START_DATE:  20629 TJD;   320 DOY;   24/11/15
IMG_START_TIME:  48014.54 SOD {13:20:14.54} UT,   109.5 [sec] since BAT Trigger Time
COUNTS:          2    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Nov 24 13:22:20 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1267921,   Seg_Num: 0
GRB_RA:           86.765d {+05h 47m 04s} (J2000),
                  87.082d {+05h 48m 20s} (current),
                  86.128d {+05h 44m 31s} (1950)
GRB_DEC:          -0.662d {-00d 39' 44"} (J2000),
                  -0.655d {-00d 39' 17"} (current),
                  -0.680d {-00d 40' 46"} (1950)
GRB_DATE:        20629 TJD;   320 DOY;   24/11/15
GRB_TIME:        47905.04 SOD {13:18:25.04} UT
TRIGGER_INDEX:   470
GRB_PHI:         136.55 [deg]
GRB_THETA:        20.87 [deg]
DELTA_TIME:      -37.00 [sec]
TRIGGER_DUR:     0.512 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     61.83 [sigma]
IMAGE_SIGNIF:    18.15 [sigma]
LC_URL:          sw01267921000msb.lc
SUN_POSTN:       231.29d {+15h 25m 10s}  -18.69d {-18d 41' 18"}
SUN_DIST:        139.88 [deg]   Sun_angle= 9.6 [hr] (West of Sun)
MOON_POSTN:       45.47d {+03h 01m 53s}  +20.87d {+20d 52' 08"}
MOON_DIST:        46.01 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      206.04,-14.59 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       86.46,-24.06 [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 = 204.63,-19.65 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Nov 24 13:23:03 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1267921,   Seg_Num: 0
POINT_RA:         86.766d {+05h 47m 04s} (J2000)
POINT_DEC:        -0.655d {-00d 39' 18"} (J2000)
POINT_ROLL:      120.909d
IMG_START_DATE:  20629 TJD;   320 DOY;   24/11/15
IMG_START_TIME:  48018.97 SOD {13:20:18.97} UT,   113.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.759
N_STARS:         10
X_OFFSET:        518 [pixels]
Y_OFFSET:        585 [pixels]
X_MAX:           1477 [pixels]
Y_MAX:           1544 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw01267921000msufc0113.fits
SUN_POSTN:       231.29d {+15h 25m 10s}  -18.69d {-18d 41' 19"}
SUN_DIST:        139.88 [deg]   Sun_angle= 9.6 [hr] (West of Sun)
MOON_POSTN:       45.48d {+03h 01m 55s}  +20.87d {+20d 52' 17"}
MOON_DIST:        46.00 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      206.03,-14.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       86.46,-24.05 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Nov 24 13:23:10 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1267921,   Seg_Num: 0
POINT_RA:         86.766d {+05h 47m 04s} (J2000)
POINT_DEC:        -0.655d {-00d 39' 18"} (J2000)
POINT_ROLL:      120.909d
IMG_START_DATE:  20629 TJD;   320 DOY;   24/11/15
IMG_START_TIME:  48018.97 SOD {13:20:18.97} UT,   113.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.759
N_STARS:         10
X_OFFSET:        518 [pixels]
Y_OFFSET:        585 [pixels]
X_MAX:           1477 [pixels]
Y_MAX:           1544 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw01267921000msufc0113.fits
SUN_POSTN:       231.29d {+15h 25m 10s}  -18.69d {-18d 41' 19"}
SUN_DIST:        139.88 [deg]   Sun_angle= 9.6 [hr] (West of Sun)
MOON_POSTN:       45.48d {+03h 01m 55s}  +20.87d {+20d 52' 19"}
MOON_DIST:        46.00 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      206.03,-14.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       86.46,-24.05 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #38234
The Fermi GBM team reports the detection of a likely LONG GRB
At 13:18:24 UT on 15 Nov 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 241115A (trigger 753369509.732778 / 241115554).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 85.2, Dec = 2.7 (J2000 degrees, equivalent to J2000 05h 40m, 2d 42'), with a statistical uncertainty of 6.0 degrees.
The angle from the Fermi LAT boresight is 43.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241115554/quicklook/glg_skymap_all_bn241115554.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/bn241115554/quicklook/glg_healpix_all_bn241115554.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241115554/quicklook/glg_lc_medres34_bn241115554.gif

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Nov 24 13:29:04 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1267921,   Seg_Num: 0
POINT_RA:         86.766d {+05h 47m 04s} (J2000)
POINT_DEC:        -0.655d {-00d 39' 18"} (J2000)
POINT_ROLL:      120.910d
IMG_START_DATE:  20629 TJD;   320 DOY;   24/11/15
IMG_START_TIME:  48231.05 SOD {13:23:51.05} UT,   326.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.821
N_STARS:         10
X_OFFSET:        278 [pixels]
Y_OFFSET:        345 [pixels]
X_MAX:           1717 [pixels]
Y_MAX:           1784 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw01267921000msufc0326.fits
SUN_POSTN:       231.30d {+15h 25m 11s}  -18.69d {-18d 41' 23"}
SUN_DIST:        139.89 [deg]   Sun_angle= 9.6 [hr] (West of Sun)
MOON_POSTN:       45.54d {+03h 02m 10s}  +20.89d {+20d 53' 33"}
MOON_DIST:        45.96 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      206.03,-14.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       86.46,-24.05 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_srclist.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Nov 24 13:30:39 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1267921,   Seg_Num: 0
POINT_RA:         86.766d {+05h 47m 04s} (J2000)
POINT_DEC:        -0.655d {-00d 39' 18"} (J2000)
ROLL:            120.910d
IMG_START_DATE:  20629 TJD;   320 DOY;   24/11/15
IMG_START_TIME:  48231.05 SOD {13:23:51.05} UT,   326.0 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     753369865
X_OFFSET:        837 [pixels]
Y_OFFSET:        904 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       997
Y_GRB_POS:       1064
BINNING_INDEX:   1
IM_URL:          sw01267921000msuni0361.fits
SUN_POSTN:       231.30d {+15h 25m 12s}  -18.69d {-18d 41' 24"}
SUN_DIST:        139.89 [deg]   Sun_angle= 9.6 [hr] (West of Sun)
MOON_POSTN:       45.56d {+03h 02m 14s}  +20.90d {+20d 53' 53"}
MOON_DIST:        45.94 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      206.03,-14.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       86.46,-24.05 [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:     Fri 15 Nov 24 13:30:56 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1267921,   Seg_Num: 0
POINT_RA:         86.766d {+05h 47m 04s} (J2000)
POINT_DEC:        -0.655d {-00d 39' 18"} (J2000)
ROLL:            120.910d
IMG_START_DATE:  20629 TJD;   320 DOY;   24/11/15
IMG_START_TIME:  48231.05 SOD {13:23:51.05} UT,   326.0 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     753369865
X_OFFSET:        837 [pixels]
Y_OFFSET:        904 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       997
Y_GRB_POS:       1064
BINNING_INDEX:   1
IM_URL:          sw01267921000msuni0361.fits
SUN_POSTN:       231.30d {+15h 25m 12s}  -18.69d {-18d 41' 24"}
SUN_DIST:        139.89 [deg]   Sun_angle= 9.6 [hr] (West of Sun)
MOON_POSTN:       45.56d {+03h 02m 15s}  +20.90d {+20d 53' 56"}
MOON_DIST:        45.94 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      206.03,-14.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       86.46,-24.05 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Nov 24 13:36:18 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1267921,   Seg_Num: 0
POINT_RA:         86.766d {+05h 47m 04s} (J2000)
POINT_DEC:        -0.655d {-00d 39' 18"} (J2000)
POINT_ROLL:      120.910d
IMG_START_DATE:  20629 TJD;   320 DOY;   24/11/15
IMG_START_TIME:  48785.58 SOD {13:33:05.58} UT,   880.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.916
N_STARS:         23
X_OFFSET:        278 [pixels]
Y_OFFSET:        345 [pixels]
X_MAX:           1717 [pixels]
Y_MAX:           1784 [pixels]
DET_THRESH:      21
PHOTO_THRESH:    12
SL_URL:          sw01267921000msufc0880.fits
SUN_POSTN:       231.30d {+15h 25m 12s}  -18.69d {-18d 41' 27"}
SUN_DIST:        139.89 [deg]   Sun_angle= 9.6 [hr] (West of Sun)
MOON_POSTN:       45.62d {+03h 02m 28s}  +20.92d {+20d 55' 04"}
MOON_DIST:        45.90 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      206.03,-14.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       86.46,-24.05 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Nov 24 13:36:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1267921,   Seg_Num: 0
POINT_RA:         86.766d {+05h 47m 04s} (J2000)
POINT_DEC:        -0.655d {-00d 39' 18"} (J2000)
POINT_ROLL:      120.910d
IMG_START_DATE:  20629 TJD;   320 DOY;   24/11/15
IMG_START_TIME:  48785.58 SOD {13:33:05.58} UT,   880.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.916
N_STARS:         23
X_OFFSET:        278 [pixels]
Y_OFFSET:        345 [pixels]
X_MAX:           1717 [pixels]
Y_MAX:           1784 [pixels]
DET_THRESH:      21
PHOTO_THRESH:    12
SL_URL:          sw01267921000msufc0880.fits
SUN_POSTN:       231.30d {+15h 25m 13s}  -18.69d {-18d 41' 27"}
SUN_DIST:        139.89 [deg]   Sun_angle= 9.6 [hr] (West of Sun)
MOON_POSTN:       45.62d {+03h 02m 29s}  +20.92d {+20d 55' 06"}
MOON_DIST:        45.90 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      206.03,-14.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       86.46,-24.05 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #38235
M. A. Williams (PSU), J. J. DeLaunay (PSU), S. Dichiara (PSU), R. Gupta (NASA GSFC), K. L. Page (U Leicester) and D. M. Palmer (LANL) report on behalf of the Neil Gehrels Swift Observatory Team:
At 13:18:25 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 241115A (trigger=1267921). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 86.765, -0.662 which is
```
   RA(J2000) = 05h 47m 04s
   Dec(J2000) = -00d 39' 44"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 5 sec. The peak count rate was ~7600 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 13:20:14.5 UT, 109.5 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source located at RA, Dec 86.77049, -0.67381 which is equivalent to:
```
   RA(J2000)  = 05h 47m 04.92s
   Dec(J2000) = -00d 40' 25.7"
```
with an uncertainty of 3.5 arcseconds (radius, 90% containment). This location is 46 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.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (3.32 x 10^21 cm^-2, Willingale et al. 2013), with an excess column of 9.4 (+6.11/-4.63) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 113 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 1.028.
Burst Advocate for this burst is M. A. Williams (mjw6837 AT psu.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:     Fri 15 Nov 24 13:37:31 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     1267921,   Seg_Num: 0
GRB_RA:           86.7701d {+05h 47m 04.82s} (J2000),
                  87.0872d {+05h 48m 20.92s} (current),
                  86.1329d {+05h 44m 31.89s} (1950)
GRB_DEC:          -0.6746d {-00d 40' 28.5"} (J2000),
                  -0.6672d {-00d 40' 01.8"} (current),
                  -0.6918d {-00d 41' 30.5"} (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:  20629 TJD;   320 DOY;   24/11/15
IMG_START_TIME:  48023.00 SOD {13:20:23.00} UT,   118.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       231.30d {+15h 25m 13s}  -18.69d {-18d 41' 28"}
SUN_DIST:        139.88 [deg]   Sun_angle= 9.6 [hr] (West of Sun)
MOON_POSTN:       45.63d {+03h 02m 31s}  +20.92d {+20d 55' 19"}
MOON_DIST:        45.91 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      206.05,-14.60 [deg] galactic lon,lat of the burst
ECL_COORDS:       86.46,-24.07 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Nov 24 13:28:54 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1267921,   Seg_Num: 0
POINT_RA:         86.766d {+05h 47m 04s} (J2000)
POINT_DEC:        -0.655d {-00d 39' 18"} (J2000)
POINT_ROLL:      120.910d
IMG_START_DATE:  20629 TJD;   320 DOY;   24/11/15
IMG_START_TIME:  48231.05 SOD {13:23:51.05} UT,   326.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.821
N_STARS:         10
X_OFFSET:        278 [pixels]
Y_OFFSET:        345 [pixels]
X_MAX:           1717 [pixels]
Y_MAX:           1784 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw01267921000msufc0326.fits
SUN_POSTN:       231.30d {+15h 25m 11s}  -18.69d {-18d 41' 22"}
SUN_DIST:        139.89 [deg]   Sun_angle= 9.6 [hr] (West of Sun)
MOON_POSTN:       45.54d {+03h 02m 10s}  +20.89d {+20d 53' 31"}
MOON_DIST:        45.96 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      206.03,-14.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       86.46,-24.05 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Nov 24 13:24:32 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1267921,   Seg_Num: 0
POINT_RA:         86.766d {+05h 47m 04s} (J2000)
POINT_DEC:        -0.655d {-00d 39' 18"} (J2000)
ROLL:            120.909d
IMG_START_DATE:  20629 TJD;   320 DOY;   24/11/15
IMG_START_TIME:  48018.97 SOD {13:20:18.97} UT,   113.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     753369653
X_OFFSET:        837 [pixels]
Y_OFFSET:        904 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       997
Y_GRB_POS:       1064
BINNING_INDEX:   1
IM_URL:          sw01267921000msuni0148.fits
SUN_POSTN:       231.29d {+15h 25m 10s}  -18.69d {-18d 41' 20"}
SUN_DIST:        139.88 [deg]   Sun_angle= 9.6 [hr] (West of Sun)
MOON_POSTN:       45.50d {+03h 01m 59s}  +20.88d {+20d 52' 36"}
MOON_DIST:        45.99 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      206.03,-14.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       86.46,-24.05 [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:     Fri 15 Nov 24 13:24:39 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1267921,   Seg_Num: 0
POINT_RA:         86.766d {+05h 47m 04s} (J2000)
POINT_DEC:        -0.655d {-00d 39' 18"} (J2000)
ROLL:            120.909d
IMG_START_DATE:  20629 TJD;   320 DOY;   24/11/15
IMG_START_TIME:  48018.97 SOD {13:20:18.97} UT,   113.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     753369653
X_OFFSET:        837 [pixels]
Y_OFFSET:        904 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       997
Y_GRB_POS:       1064
BINNING_INDEX:   1
IM_URL:          sw01267921000msuni0148.fits
SUN_POSTN:       231.29d {+15h 25m 10s}  -18.69d {-18d 41' 20"}
SUN_DIST:        139.88 [deg]   Sun_angle= 9.6 [hr] (West of Sun)
MOON_POSTN:       45.50d {+03h 01m 59s}  +20.88d {+20d 52' 37"}
MOON_DIST:        45.99 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      206.03,-14.59 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       86.46,-24.05 [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:     Fri 15 Nov 24 13:23:53 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     1267921,   Seg_Num: 0
GRB_RA:           86.7707d {+05h 47m 04.96s} (J2000),
                  87.0878d {+05h 48m 21.07s} (current),
                  86.1335d {+05h 44m 32.03s} (1950)
GRB_DEC:          -0.6736d {-00d 40' 24.9"} (J2000),
                  -0.6662d {-00d 39' 58.2"} (current),
                  -0.6908d {-00d 41' 26.9"} (1950)
GRB_ERROR:       4.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  20629 TJD;   320 DOY;   24/11/15
IMG_START_TIME:  48023.00 SOD {13:20:23.00} UT,   118.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       231.29d {+15h 25m 10s}  -18.69d {-18d 41' 19"}
SUN_DIST:        139.87 [deg]   Sun_angle= 9.6 [hr] (West of Sun)
MOON_POSTN:       45.49d {+03h 01m 57s}  +20.87d {+20d 52' 28"}
MOON_DIST:        46.01 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      206.05,-14.59 [deg] galactic lon,lat of the burst
ECL_COORDS:       86.46,-24.07 [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 #38236
V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity) D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)
MASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB 241115A ( Fermi GBM team, GCN 38234) errorbox 2796 sec after notice time and 2828 sec after trigger time at 2024-11-15 14:05:33 UT, with upper limit up to 14.0 mag. The observations began at zenith distance = 83 deg. The sun altitude is -44.1 deg.
The galactic latitude b = -14 deg., longitude l = 203 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2671089
We obtain a following upper limits.
```
Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

    2832 | 2024-11-15 14:05:33 |        MASTER-Tunka | (05h 47m 14.08s , -00d 46m 37.1s) |   C |     5 | 14.0 |        
    2871 | 2024-11-15 14:06:12 |        MASTER-Tunka | (05h 47m 14.46s , -00d 48m 32.9s) |   C |     5 | 13.8 |        
    2888 | 2024-11-15 14:06:30 |        MASTER-Tunka | (05h 47m 20.52s , -00d 48m 31.2s) |   C |     5 | 13.9 |        
    3335 | 2024-11-15 14:13:59 |        MASTER-Tunka | (05h 47m 20.28s , -00d 46m 37.9s) |   C |     1 | 13.7 |        
    3348 | 2024-11-15 14:14:12 |        MASTER-Tunka | (05h 47m 14.99s , -00d 47m 15.0s) |   C |     1 | 13.3 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #38237
V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity) D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)
MASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the Swift GRB 241115A ( M. A. Williams et al., GCN 38235) errorbox 2802 sec after notice time and 2828 sec after trigger time at 2024-11-15 14:05:33 UT, with upper limit up to 16.4 mag. The observations began at zenith distance = 83 deg. The sun altitude is -44.1 deg.
The galactic latitude b = -14 deg., longitude l = 206 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2671057
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

    2831 |        MASTER-Tunka |   C |     5 | 14.0 |        
    2871 |        MASTER-Tunka |   C |     5 | 13.8 |        
    2888 |        MASTER-Tunka |   C |     5 | 13.9 |        
    3335 |        MASTER-Tunka |   C |     1 | 13.7 |        
    3348 |        MASTER-Tunka |   C |     1 | 13.3 |        
    5552 |        MASTER-Tunka |   C |    60 | 16.4 |  Coadd 
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #38246
R. Strausbaugh (Eastern Illinois University), A. Cucchiara (NASA) report on behalf of a larger collaboration:
We observed the Swift GRB 241115A field (Williams et al., GCN 38235) with the LCOGT 1-meter Sinistro instrument at the South African Astronomical Observatory site, on November 15, from 21:52 to 22:24 UT (corresponding to 8.57 to 9.10 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 Swift XRT error region in either band.
The following 5-sigma upper limits are calculated using the PanSTARRS catalog as reference:
```
r > 21.5
i > 21.2
```
These magnitudes are not corrected for galactic extinction.
GCN Circular #38247
C. de Barra (University College Dublin), M. Daf=C4=8D=C3=ADkov=C3=A1 (Masar= yk U.), and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst M= onitor Team:
"At 13:18:24.73 UT on 15 November 2024, the Fermi Gamma-ray Burst Monitor (= GBM) triggered and located GRB 241115A (trigger 753369509/241115554). which was also detected by Swift BAT (M. A. Williams et al. 2024, GCN 38235= ). The Fermi GBM on-ground location is consistent with the Swift BAT position.
The angle from the Fermi LAT boresight is 46 degrees.
The GBM light curve consists of a single emission episode with a duration (= T90) of about 3.1 s (50-300 keV). The time-averaged spectrum from T0-3.4 to T0+5.8 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.7 +/- 0.1 and the cutoff energy, parameterized as Epeak, is 90 +/- 7 keV.
The event fluence (10-1000 keV) in this time interval is (1.57 +/- 0.08)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+0.32 s in the 10-1000 keV band is 7.7 +/- 0.3 ph/s/cm^2.
A Band function fits the spectrum equally well with Epeak=3D 80 +/- 9 keV, alpha =3D -0.6 +/- 0.2 and beta =3D -2.7 +/- 0.= 4.
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 Pa= ge: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
GCN Circular #38253
Guowang Du, Brajesh Kumar, Weikang Lin, Yehao Cheng, Yaosong Yu, Yu Pan, Xingzhu Zou, Xinlei Chen, Jinghua Zhang, Yuanpei Yang, Yuan Fang, Xiangkun Liu, Xiaowei Liu (SWIFAR, YNU) report on behalf of the Mephisto Team:
The field of GRB 241115A (Williams et al., GCN 38235)was observed with the 1.6m Multi-channel Photometric Survey Telescope (Mephisto) of Yunnan University located at Lijiang Observatory starting from 15:54:07 UT 2024-11-15 (~2.6 hr after the trigger). Multiple frames with 180s and 50s exposures in uvgr bands were taken. No new source is detected in our stacked images, consistent to Lipunov et al., (GCN 38237) and Strausbaugh & Cucchiara (GCN 38246). The 3-sigma upper limits are listed below.
```
Start_Time(UT)      Band  Exp(s) Lim-mag(AB)
2024-11-15T15:54:07  u    180*3   >20.35
2024-11-15T16:04:30  v    180*3   >20.65
2024-11-15T15:54:07  g     50*9   >21.06
2024-11-15T16:04:31  r     50*9   >21.38
```
--------------------------------------------------------------------------
Mephisto (Multi-channel Photometric Survey Telescope) is a 1.6m wide-field multi-channel telescope, the first of its type in the world, capable of imaging the same field of view in three optical bands simultaneously. It provides real-time, high-quality colors of stellar objects. The on-site telescope assemblage and commissioning were carried out in September 2022. The first light in all three channels was achieved on 2023 December 21.
--------------------------------------------------------------------------
GCN Circular #38256
R. Brivio (INAF-OAB), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAR), D.N. Burrows (PSU), M. A. Williams (PSU), S. Dichiara (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
Swift-XRT has performed follow-up observations of the Swift-BAT-detected burst GRB 241115A, collecting 11.3 ks of Photon Counting (PC) mode data between T0+92 s and T0+102.8 ks.
An uncatalogued X-ray source is detected consistent with being within 296 arcsec of the Swift-BAT position and is above the RASS 3-sigma upper limit at this position and fading with >3-sigma significance, and is therefore likely the GRB afterglow. Using 2620 s of PC mode data and 5 UVOT images, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 86.77097, -0.67462 which is equivalent to:
```
RA (J2000): 05h 47m 05.03s
Dec(J2000): -00d 40' 28.6"
```
with an uncertainty of 2.2 arcsec (radius, 90% confidence). This position is 50 arcsec from the Swift-BAT position.
The light curve can be modelled with a power-law decay with a decay index of alpha=1.13 (+/-0.07).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.0 (+/-0.4). The best-fitting absorption column is 1.7 (+0.6, -0.5) x 10^22 cm^-2, in excess of the Galactic value of 3.3 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 5.9 x 10^-11 (1.2 x 10^-10) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.7 (+0.6, -0.5) x 10^22 cm^-2
Galactic foreground: 3.3 x 10^21 cm^-2
Excess significance: 4.5 sigma
Photon index:	     2.0 (+/-0.4)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01267921. The results of the full analysis of the XRT observations are available at https://www.swift.ac.uk/ToO_GRBs/01267921.
This circular is an official product of the Swift-XRT team.
GCN Circular #38274
J. Durbak (UMD), O. Guiffreda (UMD), A. S. Kutyrev (NASA/GSFC), E. Troja (U Rome), S. B. Cenko (NASA/GSFC)
Following the Swift BAT (GCN 38235) and Fermi GBM (GCN 38234) detection, we observed the transient field in H-filter with PRIME ~3.5 days after Swift and Fermi detection.
At the counterpart positions reported by Swift XRT (GCN 38194) and Swift UVOT (GCN 38256), we detect no uncatalogued sources in H-band. Using nearby 2MASS stars for preliminary calibration we derive a limiting magnitude of <20.0 AB, not corrected for Galactic extinction
PRIME is a 1.8m telescope with 1.56 square degree FOV (0.5 arcsec/pixel) located in Sutherland, South Africa at the South African Astronomical Observatory (SAAO) (Kutyrev et al. 2023, Yama et al. 2023, Durbak et al. 2024).
We thank the Osaka University observers at PRIME and the staff at SAAO for their support with these observations.
GCN Circular #38278
N. Cannady (GSFC/UMBC), A. Yoshida, T. Sakamoto, S. Sugita, Y. Kawakubo (AGU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA), Y. Asaoka (ICRR), S. Torii, Y. Akaike, K. Kobayashi (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), M. L. Cherry (LSU), S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena), and the CALET collaboration:
The GRB 241115A (Fermi GBM Final Real-time Localization: Fermi GBM team, GCN Circ 38234; Swift detection of a burst: Williams et al., GCN Circ 38235; Fermi GBM Observation: de Barra et al., GCN Circ 38247) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 13:18:24.988 UTC on 15 November 2024 (https://cgbm.calet.jp/cgbm_trigger/flight/1415711919/index.html). The burst signal was seen by all CGBM detectors. Because of a problem with the ground alert processing script, the GCN notice was not distributed automatically for this event.
The burst light curve shows a single pulse that starts at T-0.6 sec, peaks at T+0.1 sec, and ends at T+1.6 sec. The T90 and T50 durations measured by the SGM data are 2.0 +/- 0.3 sec and 1.1 +/- 0.1 sec (40-1000 keV), respectively.
The ground-processed light curve is available at
https://cgbm.calet.jp/cgbm_trigger/ground/1415711919/
The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at Waseda University.

Back to JG's homepage

Jochen Greiner, last update: 20-Nov-2024 [Disclaimer]