Gamma-ray Burst 241010A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 Oct 24 10:05:31 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1259578,   Seg_Num: 0
GRB_RA:          153.365d {+10h 13m 28s} (J2000),
                 153.695d {+10h 14m 47s} (current),
                 152.699d {+10h 10m 48s} (1950)
GRB_DEC:         +11.544d {+11d 32' 38"} (J2000),
                 +11.420d {+11d 25' 14"} (current),
                 +11.792d {+11d 47' 31"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       2662 [cnts]    Image_Peak=390 [image_cnts]
TRIGGER_DUR:     0.384 [sec] 
TRIGGER_INDEX:   469     E_range: 25-100 keV
BKG_INTEN:       15608 [cnts]
BKG_TIME:        36301.67 SOD {10:05:01.67} UT
BKG_DUR:         8 [sec]
GRB_DATE:        20593 TJD;   284 DOY;   24/10/10
GRB_TIME:        36314.40 SOD {10:05:14.40} UT
GRB_PHI:         -13.73 [deg]
GRB_THETA:        29.01 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     45.70 [sigma]
IMAGE_SIGNIF:    11.61 [sigma]
MERIT_PARAMS:     +1  +0  +0  -1  +2  +1  +0  +0 -69  +0 
SUN_POSTN:       196.23d {+13h 04m 54s}   -6.91d {-06d 54' 19"}
SUN_DIST:         46.11 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      284.89d {+18h 59m 33s}  -28.03d {-28d 01' 52"}
MOON_DIST:       131.52 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      227.91, 49.83 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      151.14,  0.51 [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 = 17.77,18.84 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 Oct 24 10:07:01 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     1259578,   Seg_Num: 0
POINT_RA:        153.363d {+10h 13m 27s} (J2000)
POINT_DEC:       +11.546d {+11d 32' 44"} (J2000)
IMG_START_DATE:  20593 TJD;   284 DOY;   24/10/10
IMG_START_TIME:  36416.39 SOD {10:06:56.39} UT,   102.0 [sec] since BAT Trigger Time
COUNTS:          8    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:     Thu 10 Oct 24 10:09:12 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1259578,   Seg_Num: 0
GRB_RA:          153.365d {+10h 13m 28s} (J2000),
                 153.695d {+10h 14m 47s} (current),
                 152.699d {+10h 10m 48s} (1950)
GRB_DEC:         +11.544d {+11d 32' 38"} (J2000),
                 +11.420d {+11d 25' 14"} (current),
                 +11.792d {+11d 47' 31"} (1950)
GRB_DATE:        20593 TJD;   284 DOY;   24/10/10
GRB_TIME:        36314.40 SOD {10:05:14.40} UT
TRIGGER_INDEX:   469
GRB_PHI:         -13.73 [deg]
GRB_THETA:        29.01 [deg]
DELTA_TIME:      6.00 [sec]
TRIGGER_DUR:     0.384 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     45.70 [sigma]
IMAGE_SIGNIF:    11.61 [sigma]
LC_URL:          sw01259578000msb.lc
SUN_POSTN:       196.23d {+13h 04m 55s}   -6.91d {-06d 54' 23"}
SUN_DIST:         46.11 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      284.93d {+18h 59m 42s}  -28.03d {-28d 01' 38"}
MOON_DIST:       131.55 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      227.91, 49.83 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      151.14,  0.51 [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 = 17.77,18.84 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 Oct 24 10:11:13 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     1259578,   Seg_Num: 0
GRB_RA:          153.3821d {+10h 13m 31.70s} (J2000),
                 153.7120d {+10h 14m 50.88s} (current),
                 152.7155d {+10h 10m 51.73s} (1950)
GRB_DEC:         +11.5353d {+11d 32' 07.0"} (J2000),
                 +11.4118d {+11d 24' 42.5"} (current),
                 +11.7835d {+11d 47' 00.4"} (1950)
GRB_ERROR:       4.4 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  20593 TJD;   284 DOY;   24/10/10
IMG_START_TIME:  36433.00 SOD {10:07:13.00} UT,   118.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       196.23d {+13h 04m 55s}   -6.91d {-06d 54' 25"}
SUN_DIST:         46.10 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      284.95d {+18h 59m 47s}  -28.03d {-28d 01' 30"}
MOON_DIST:       131.55 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      227.93, 49.84 [deg] galactic lon,lat of the burst
ECL_COORDS:      151.16,  0.51 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 Oct 24 10:15:58 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1259578,   Seg_Num: 0
POINT_RA:        153.363d {+10h 13m 27s} (J2000)
POINT_DEC:       +11.546d {+11d 32' 47"} (J2000)
POINT_ROLL:      111.305d
IMG_START_DATE:  20593 TJD;   284 DOY;   24/10/10
IMG_START_TIME:  36419.82 SOD {10:06:59.82} UT,   105.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        8.616
N_STARS:         24
X_OFFSET:        505 [pixels]
Y_OFFSET:        554 [pixels]
X_MAX:           1464 [pixels]
Y_MAX:           1513 [pixels]
DET_THRESH:      26
PHOTO_THRESH:    16
SL_URL:          sw01259578000msufc0105.fits
SUN_POSTN:       196.23d {+13h 04m 56s}   -6.91d {-06d 54' 29"}
SUN_DIST:         46.12 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      285.00d {+18h 59m 59s}  -28.02d {-28d 01' 12"}
MOON_DIST:       131.62 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      227.90, 49.83 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      151.14,  0.51 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 Oct 24 10:16:13 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1259578,   Seg_Num: 0
POINT_RA:        153.363d {+10h 13m 27s} (J2000)
POINT_DEC:       +11.546d {+11d 32' 47"} (J2000)
POINT_ROLL:      111.305d
IMG_START_DATE:  20593 TJD;   284 DOY;   24/10/10
IMG_START_TIME:  36419.82 SOD {10:06:59.82} UT,   105.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        8.616
N_STARS:         24
X_OFFSET:        505 [pixels]
Y_OFFSET:        554 [pixels]
X_MAX:           1464 [pixels]
Y_MAX:           1513 [pixels]
DET_THRESH:      26
PHOTO_THRESH:    16
SL_URL:          sw01259578000msufc0105.fits
SUN_POSTN:       196.23d {+13h 04m 56s}   -6.91d {-06d 54' 30"}
SUN_DIST:         46.12 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      285.00d {+19h 00m 00s}  -28.02d {-28d 01' 12"}
MOON_DIST:       131.62 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      227.90, 49.83 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      151.14,  0.51 [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:     Thu 10 Oct 24 10:17:39 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1259578,   Seg_Num: 0
POINT_RA:        153.363d {+10h 13m 27s} (J2000)
POINT_DEC:       +11.546d {+11d 32' 47"} (J2000)
ROLL:            111.305d
IMG_START_DATE:  20593 TJD;   284 DOY;   24/10/10
IMG_START_TIME:  36419.82 SOD {10:06:59.82} UT,   105.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     750247654
X_OFFSET:        824 [pixels]
Y_OFFSET:        873 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       984
Y_GRB_POS:       1033
BINNING_INDEX:   1
IM_URL:          sw01259578000msuni0140.fits
SUN_POSTN:       196.23d {+13h 04m 56s}   -6.91d {-06d 54' 31"}
SUN_DIST:         46.12 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      285.01d {+19h 00m 03s}  -28.02d {-28d 01' 06"}
MOON_DIST:       131.63 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      227.90, 49.83 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      151.14,  0.51 [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:     Thu 10 Oct 24 10:18:09 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1259578,   Seg_Num: 0
POINT_RA:        153.363d {+10h 13m 27s} (J2000)
POINT_DEC:       +11.546d {+11d 32' 47"} (J2000)
ROLL:            111.305d
IMG_START_DATE:  20593 TJD;   284 DOY;   24/10/10
IMG_START_TIME:  36419.82 SOD {10:06:59.82} UT,   105.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     750247654
X_OFFSET:        824 [pixels]
Y_OFFSET:        873 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       984
Y_GRB_POS:       1033
BINNING_INDEX:   1
IM_URL:          sw01259578000msuni0140.fits
SUN_POSTN:       196.23d {+13h 04m 56s}   -6.91d {-06d 54' 31"}
SUN_DIST:         46.12 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      285.02d {+19h 00m 04s}  -28.02d {-28d 01' 04"}
MOON_DIST:       131.64 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      227.90, 49.83 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      151.14,  0.51 [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:     Thu 10 Oct 24 10:20:21 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     1259578,   Seg_Num: 0
GRB_RA:          153.3814d {+10h 13m 31.53s} (J2000),
                 153.7113d {+10h 14m 50.71s} (current),
                 152.7148d {+10h 10m 51.56s} (1950)
GRB_DEC:         +11.5342d {+11d 32' 03.1"} (J2000),
                 +11.4107d {+11d 24' 38.5"} (current),
                 +11.7824d {+11d 46' 56.5"} (1950)
GRB_ERROR:       0.8 [arcsec radius, statistical only]
GRB_MAG:         18.32 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  20593 TJD;   284 DOY;   24/10/10
IMG_START_TIME:  36416.00 SOD {10:06:56.00} UT,   101.6 [sec] since BAT Trigger Time
SUN_POSTN:       196.24d {+13h 04m 57s}   -6.91d {-06d 54' 33"}
SUN_DIST:         46.10 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      285.04d {+19h 00m 10s}  -28.02d {-28d 00' 56"}
MOON_DIST:       131.64 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      227.93, 49.84 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      151.16,  0.51 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 10 Oct 24 10:21:58 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1259578,   Seg_Num: 0
POINT_RA:        153.363d {+10h 13m 27s} (J2000)
POINT_DEC:       +11.547d {+11d 32' 48"} (J2000)
POINT_ROLL:      111.305d
IMG_START_DATE:  20593 TJD;   284 DOY;   24/10/10
IMG_START_TIME:  36631.66 SOD {10:10:31.66} UT,   317.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        3.940
N_STARS:         23
X_OFFSET:        265 [pixels]
Y_OFFSET:        314 [pixels]
X_MAX:           1704 [pixels]
Y_MAX:           1753 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw01259578000msufc0317.fits
SUN_POSTN:       196.24d {+13h 04m 57s}   -6.91d {-06d 54' 35"}
SUN_DIST:         46.12 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      285.06d {+19h 00m 14s}  -28.01d {-28d 00' 50"}
MOON_DIST:       131.67 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      227.90, 49.83 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      151.14,  0.51 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN Circular #37755
S. Dichiara (PSU), P. A. Evans (U Leicester), C. Gronwall (PSU), J. A. Kennea (PSU), K. L. Page (U Leicester), D. M. Palmer (LANL) and B. Sbarufatti (INAF-OAB) report on behalf of the Neil Gehrels Swift Observatory Team:
At 10:05:14 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 241010A (trigger=1259578). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 153.365, +11.544 which is
```
   RA(J2000) = 10h 13m 28s
   Dec(J2000) = +11d 32' 38"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 40 sec. The peak count rate was ~10000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 10:06:56.3 UT, 102.0 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 153.38152, 11.53521 which is equivalent to:
```
   RA(J2000)  = 10h 13m 31.56s
   Dec(J2000) = +11d 32' 06.8"
```
with an uncertainty of 3.8 arcseconds (radius, 90% containment). This location is 66 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 in excess of the Galactic value (3.87 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 5.8 (+3.64/-2.97) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 105 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	10:13:31.54 = 153.38141
  DEC(J2000) = +11:32:03.4  =  11.53429
```
with a 90%-confidence error radius of about 0.77 arc sec. This position is 4.4 arc sec. from the center of the XRT error circle. The estimated magnitude is 18.33 with a 1-sigma error of about 0.15. No correction has been made for the expected extinction corresponding to E(B-V) of 0.040.
Burst Advocate for this burst is S. Dichiara (sbd5667 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:     Thu 10 Oct 24 10:22:13 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1259578,   Seg_Num: 0
POINT_RA:        153.363d {+10h 13m 27s} (J2000)
POINT_DEC:       +11.547d {+11d 32' 48"} (J2000)
POINT_ROLL:      111.305d
IMG_START_DATE:  20593 TJD;   284 DOY;   24/10/10
IMG_START_TIME:  36631.66 SOD {10:10:31.66} UT,   317.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        3.940
N_STARS:         23
X_OFFSET:        265 [pixels]
Y_OFFSET:        314 [pixels]
X_MAX:           1704 [pixels]
Y_MAX:           1753 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw01259578000msufc0317.fits
SUN_POSTN:       196.24d {+13h 04m 57s}   -6.91d {-06d 54' 35"}
SUN_DIST:         46.12 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      285.06d {+19h 00m 14s}  -28.01d {-28d 00' 49"}
MOON_DIST:       131.68 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      227.90, 49.83 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      151.14,  0.51 [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:     Thu 10 Oct 24 10:23:35 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1259578,   Seg_Num: 0
POINT_RA:        153.363d {+10h 13m 27s} (J2000)
POINT_DEC:       +11.547d {+11d 32' 48"} (J2000)
ROLL:            111.305d
IMG_START_DATE:  20593 TJD;   284 DOY;   24/10/10
IMG_START_TIME:  36631.66 SOD {10:10:31.66} UT,   317.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     750247865
X_OFFSET:        824 [pixels]
Y_OFFSET:        873 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       984
Y_GRB_POS:       1033
BINNING_INDEX:   1
IM_URL:          sw01259578000msuni0352.fits
SUN_POSTN:       196.24d {+13h 04m 57s}   -6.91d {-06d 54' 37"}
SUN_DIST:         46.13 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      285.07d {+19h 00m 17s}  -28.01d {-28d 00' 44"}
MOON_DIST:       131.69 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      227.90, 49.83 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      151.14,  0.51 [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:     Thu 10 Oct 24 10:23:51 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1259578,   Seg_Num: 0
POINT_RA:        153.363d {+10h 13m 27s} (J2000)
POINT_DEC:       +11.547d {+11d 32' 48"} (J2000)
ROLL:            111.305d
IMG_START_DATE:  20593 TJD;   284 DOY;   24/10/10
IMG_START_TIME:  36631.66 SOD {10:10:31.66} UT,   317.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     750247865
X_OFFSET:        824 [pixels]
Y_OFFSET:        873 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       984
Y_GRB_POS:       1033
BINNING_INDEX:   1
IM_URL:          sw01259578000msuni0352.fits
SUN_POSTN:       196.24d {+13h 04m 57s}   -6.91d {-06d 54' 37"}
SUN_DIST:         46.13 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      285.08d {+19h 00m 18s}  -28.01d {-28d 00' 42"}
MOON_DIST:       131.69 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      227.90, 49.83 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      151.14,  0.51 [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:     Thu 10 Oct 24 10:23:52 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     1259578,   Seg_Num: 0
GRB_RA:          153.3811d {+10h 13m 31.46s} (J2000),
                 153.7110d {+10h 14m 50.64s} (current),
                 152.7145d {+10h 10m 51.49s} (1950)
GRB_DEC:         +11.5346d {+11d 32' 04.5"} (J2000),
                 +11.4111d {+11d 24' 40.0"} (current),
                 +11.7828d {+11d 46' 57.9"} (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:  20593 TJD;   284 DOY;   24/10/10
IMG_START_TIME:  36433.00 SOD {10:07:13.00} UT,   118.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       196.24d {+13h 04m 57s}   -6.91d {-06d 54' 37"}
SUN_DIST:         46.10 [deg]   Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN:      285.08d {+19h 00m 18s}  -28.01d {-28d 00' 42"}
MOON_DIST:       131.67 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      227.93, 49.84 [deg] galactic lon,lat of the burst
ECL_COORDS:      151.16,  0.51 [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 #37756
L. Izzo (INAF-OACn and DARK/NBI) and D. B. Malesani (DAWN/NBI and Radboud Univ.) report:
We observed the field of the GRB 241010A (Dichiara et al., GCN #37755) with the Sinistro instrument mounted on the 1-m telescope of the LCO network, located at the McDonald Observatory, TX, United States. Observations started on 2024 October 10th at 11:47:59 UT (1.74 hr after the GRB trigger). We obtained a series of 3x180 s images in the SDSS-r filter.
In the stacked r-band, we detect the optical afterglow within the error box of the Swift-UVOT afterglow (Dichiara, GCN #37755). We measure a preliminary magnitude of r = 19.64 +/- 0.11 mag (AB), calibrated against nearby stars from the Pan-STARRS catalog.
This project has received funding from the European Union's Horizon 2020 research and innovation program under grant agreement No 101004719.
GCN Circular #37757
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 624 s of XRT Photon Counting mode data and 1 UVOT images for GRB 241010A, 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 = 153.38132, +11.53445 which is equivalent to:
```
RA (J2000): 10h 13m 31.52s
Dec (J2000): +11d 32' 04.0"
```
with an uncertainty of 2.1 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 #37762
Geoffrey Mo (MIT), Tomas Ahumada (Caltech), Benjamin Schneider (MIT), Viraj Karambelkar (Caltech), Danielle Frostig (CfA), Robert Stein (Caltech), Nathan Lourie (MIT), Robert Simcoe (MIT), and Mansi Kasliwal (Caltech) report:
We observed the field of GRB 241010A (Dichiara et al., GCN 37755; Evans et al., GCN 37757) in the near-infrared J-band with the Palomar 1-m telescope, equipped with the 1-square degree WINTER camera (Lourie et al. 2020, Frostig et al. 2024).
Observations were triggered automatically and began at 2024-10-10T11:50:36 UTC (~1.8 hours after the GRB), consisting of 15 x 120 s exposures. The images were processed using the WINTER data reduction pipeline (https://github.com/winter-telescope/mirar, https://doi.org/10.5281/zenodo.13352565).
We do not detect a source at the optical and refined Swift/XRT counterpart location (Dichiara et al., GCN 37755; Izzo et al., GCN 37756; Evans et al., GCN 37757). We obtain the following 5-sigma upper limit: J ~ 18.0 mag (AB).
WINTER (Wide-field INfrared Transient ExploreR) is a partnership between MIT and Caltech, housed at Palomar Observatory, and funded by NSF MRI, NSF AAG, the David and Lucile Packard Foundation, and the MIT Kavli Institute for Astrophysics and Space Research.
GCN Circular #37764
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 GRB 241010A ( S. Dichiara et al., GCN 37755) errorbox 59814 sec after notice time and 59836 sec after trigger time at 2024-10-11 02:42:31 UT, with upper limit up to 15.6 mag. The observations began at zenith distance = 81 deg. The sun altitude is -17.5 deg.
The galactic latitude b = 50 deg., longitude l = 229 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2633103
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

   59927 |         MASTER-SAAO |   C |   180 | 13.9 |        
   60126 |         MASTER-SAAO |   C |   180 | 15.6 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #37769
S. Dichiara (PSU), J.A. Kennea (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), M. Ferro (INAF-OAB), R. Brivio (INAF-OAB), A. D'Ai (INAF-IASFPA), D.N. Burrows (PSU) and P.A. Evans report on behalf of the Swift-XRT team:
We have analysed 8.7 ks of XRT data for GRB 241010A, from 86 s to 68.0 ks after the BAT trigger. The data comprise 9 s in Windowed Timing (WT) mode (taken while Swift was slewing), with the remainder in Photon Counting (PC) mode.
The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=3.3 (+4.0, -0.9). At T+154 s the decay flattens to an alpha of 0.1 (+0.3, -0.4). The light curve breaks again at T+535 s to a decay with alpha=5.2 (+2.8, -3.4), and again at T+677 s s to alpha=-0.6 (+0.4, -0.9), before a final break at T+3672 s s after which the decay index is 0.92 (+0.14, -0.05).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.91 (+/-0.13). The best-fitting absorption column is 2.0 (+/-0.5) x 10^21 cm^-2, in excess of the Galactic value of 3.9 x 10^20 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 (5.0 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.0 (+/-0.5) x 10^21 cm^-2
Galactic foreground: 3.9 x 10^20 cm^-2
Excess significance: 6.0 sigma
Photon index:	     1.91 (+/-0.13)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01259578.
This circular is an official product of the Swift-XRT team.
GCN Circular #37771
S.Q. Jiang, S.Y. Fu, X. Liu, J. An, Z.P. Zhu, D. Xu (NAOC), J.Z. Liu (XAO) report on behalf of a large collaboration:
We observed the field of GRB 241010A detected by Swift (Dichiara et al. GCN 37755) using the 100C telescope of the JinShan project located at Altay, Xinjiang, China. A series of 300 s frames are obtained in the Sloan r-band, starting at 22:02:29.24 on 2024-10-10, i.e. 11.95 hr after the BAT trigger.
The optical afterglow (Dichiara et al. GCN 37755; Izzo et al. GCN 37756) of the burst is clearly detected in our stacked image. We measured a preliminary magnitude of r = 20.46 +/- 0.08 (AB), calibrated with nearby PanSTARRS stars. The magnitude is not corrected for Galactic extinction.
We also note that there exists a known source at the JinShan position in the Legacy Survey at coordinates R.A. (J2000) = 10:13:31.5317, Dec.(J2000) = +11:32:03.116, which is ~ 0.4 arcsec from the center of the UVOT position. The source has g = 23.0 +/- 0.05, r = 22.83 +/- 0.06, z = 22.13 +/- 0.09, a photometric redshfit of z = 0.87 +/- 0.11, and could be the host galaxy of the burst.
We acknowledge the excellent support from X. Yao, S.W. Luo, and Z.K. Feng for enabling these observations.
GCN Circular #37792
D. Sadaula (GSFC/UMBC), S. D. Barthelmy (GSFC), S. Dichiara (PSU), R. Gupta (GSFC), 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), T. Sakamoto (AGU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 241010A (trigger #1259578) (Dichiara, et al., GCN Circ. 37755). The BAT ground-calculated position is RA, Dec = 153.367, 11.544 deg which is
```
   RA(J2000)  =  10h 13m 28.1s
   Dec(J2000) = +11d 32' 40.1"
```
with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 85%.
The mask-weighted light curve shows multiple emission periods. The first period lasts ~six seconds and displays three pulses, followed by a quiescent period, and then a second emission period lasting ~15 seconds with two apparent pulses. T90 (15-350 keV) is 30.86 +- 1.36 sec (estimated error including systematics).
The time-averaged spectrum from T-0.04 to T+35.12 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.88 +- 0.08. The fluence in the 15-150 keV band is 2.0 +- 0.1 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T-0.04 sec in the 15-150 keV band is 4.3 +- 0.2 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/1259578
GCN Circular #37854
K. Smith (UVI), P. Gokuldass (ERAU), N. Orange (OrangeWave Innovative Science, LLC), D. Morris (NASA), T. Lombardi (Eckerd College), F. George (ERAU), K. Noonan (UVI), R. Querrard (UVI), D. Smith (UVI) report:
We observed the field of GRB241010A (Dichiara et al., GCN 37755) with the 0.5m Virgin Island Robotic Telescope (VIRT) at the University of the Virgin Islands' Etelman Observatory on 2024-10-11 starting at 08:53:49 (Tmid+ ~23.03 hrs). We performed a series of exposures in R filter with a total exposure of 590s. The weather conditions were partly cloudy during the hours of observation with an average airmass of 1.88.
We do not detect any source within the enhanced XRT position (Evans et al. GCN 37757). This non-detection is consistent with detections reported by (Izzo et al. GCN 37756) and (Jiang et al. GCN 37771) and upper limits reported by (Mo et al. GCN 37762) and (Lipunov et al. GCN 37764). We report the following 3-sigma upper limit:
```
T_mid                ||Exposure   ||Filter   ||Limit 
T+23.03  hrs         || 590s      || R       ||>19.74
```
The limit is estimated from comparison to nearby USNO B1 stars and is not corrected for Galactic extinction. The VIRT is still in the commissioning phase.
We acknowledge financial support from NASA EPSCoR award 80NNSC22M0063, NSF PAARE award 2319415, and NASA EPSCoR award 80NSSC24M0112. This message can be cited.
GCN Circular #38080
D. B. Malesani (DAWN/NBI and Radboud Univ.), A. Cabrera-Lavers (GTC), J. F. Agui Fernandez (CAHA), A. de Ugarte Postigo (LAM/OCA, CNRS), C. C. Thoene (ASU-CAS, AbAO), J. Rastinejad (Northwestern), B. P. Gompertz (Birmingham), A. J. Levan (Radboud Univ. and Warwick Univ.), W. Fong (Northwestern), N. R. Tanvir (U. Leicester), J. P. U. Fynbo (DAWN/NBI), L. Izzo (INAF-OACn & DARK/NBI), A. Martin-Carrillo (UCD), G. Lombardi (GTC), S. Geier (GTC) report:
At the location of the optical afterglow of GRB 241010A (Dichiara et al., GCN 37755), an object is visible in the Legacy survey, first noticed by Jiang et al. (GCN 37771). This is most likely the GRB host galaxy.
On 2024 November 2, once the field became visible to ground-based observatories, we secured spectroscopic observations of the host galaxy using the Gran Telescopio Canarias (GTC) equipped with the OSIRIS+ instrument. Three spectra of 900 s each were obtained, using the R1000R grism, which covers the wavelength range 5150-10200 AA.
On top of clear continuum, a multitude of emission lines are visible, which we interpret as due to [O II], [Ne III] 3869, Hdelta, Hgamma, Hbeta, [O III] 4958 and [O III] 5006, all at a common redshift z = 0.977, which we suggest to be the redshift of GRB 241010A. This value is consistent with the photometric estimate from the Legacy survey (z_ph = 0.87 +- 0.11; Zhou et al. 2021, MNRAS, 501, 3309).

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