Gamma-ray Burst 221027B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Oct 22 19:19:12 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1131397,   Seg_Num: 0
GRB_RA:          225.603d {+15h 02m 25s} (J2000),
                 225.796d {+15h 03m 11s} (current),
                 225.179d {+15h 00m 43s} (1950)
GRB_DEC:         +47.448d {+47d 26' 53"} (J2000),
                 +47.359d {+47d 21' 34"} (current),
                 +47.644d {+47d 38' 37"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       2553 [cnts]    Image_Peak=274 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   141     E_range: 15-50 keV
BKG_INTEN:       12787 [cnts]
BKG_TIME:        69201.88 SOD {19:13:21.88} UT
BKG_DUR:         8 [sec]
GRB_DATE:        19879 TJD;   300 DOY;   22/10/27
GRB_TIME:        69218.78 SOD {19:13:38.78} UT
GRB_PHI:         177.41 [deg]
GRB_THETA:        42.66 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     22.27 [sigma]
IMAGE_SIGNIF:    14.69 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +1  +3  +0  +0 -47  +0 
SUN_POSTN:       212.09d {+14h 08m 22s}  -12.97d {-12d 58' 08"}
SUN_DIST:         61.56 [deg]   Sun_angle= -0.9 [hr] (East of Sun)
MOON_POSTN:      242.58d {+16h 10m 19s}  -22.91d {-22d 54' 52"}
MOON_DIST:        71.88 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       80.22, 57.37 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      197.62, 60.24 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This Notice was delayed by more than 60 sec past the end of the trigger integration interval;  
COMMENTS:        probably due to it occurring during a Malindi downlink session.  
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 = 176.20,13.06 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Oct 22 19:19:41 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     1131397,   Seg_Num: 0
POINT_RA:        225.611d {+15h 02m 27s} (J2000)
POINT_DEC:       +47.471d {+47d 28' 15"} (J2000)
IMG_START_DATE:  19879 TJD;   300 DOY;   22/10/27
IMG_START_TIME:  69344.96 SOD {19:15:44.96} UT,   126.2 [sec] since BAT Trigger Time
COUNTS:          4    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 27 Oct 22 19:20:40 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1131397,   Seg_Num: 0
GRB_RA:          225.603d {+15h 02m 25s} (J2000),
                 225.796d {+15h 03m 11s} (current),
                 225.179d {+15h 00m 43s} (1950)
GRB_DEC:         +47.448d {+47d 26' 53"} (J2000),
                 +47.359d {+47d 21' 34"} (current),
                 +47.644d {+47d 38' 37"} (1950)
GRB_DATE:        19879 TJD;   300 DOY;   22/10/27
GRB_TIME:        69218.78 SOD {19:13:38.78} UT
TRIGGER_INDEX:   141
GRB_PHI:         177.41 [deg]
GRB_THETA:        42.66 [deg]
DELTA_TIME:      71.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     22.27 [sigma]
IMAGE_SIGNIF:    14.69 [sigma]
LC_URL:          sw01131397000msb.lc
SUN_POSTN:       212.09d {+14h 08m 22s}  -12.97d {-12d 58' 09"}
SUN_DIST:         61.56 [deg]   Sun_angle= -0.9 [hr] (East of Sun)
MOON_POSTN:      242.59d {+16h 10m 23s}  -22.92d {-22d 55' 06"}
MOON_DIST:        71.89 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       80.22, 57.37 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      197.62, 60.24 [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 = 176.20,13.06 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Oct 22 19:21:13 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1131397,   Seg_Num: 0
POINT_RA:        225.610d {+15h 02m 26s} (J2000)
POINT_DEC:       +47.471d {+47d 28' 15"} (J2000)
POINT_ROLL:      195.006d
IMG_START_DATE:  19879 TJD;   300 DOY;   22/10/27
IMG_START_TIME:  69349.54 SOD {19:15:49.54} UT,   130.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.779
N_STARS:         23
X_OFFSET:        615 [pixels]
Y_OFFSET:        466 [pixels]
X_MAX:           1574 [pixels]
Y_MAX:           1425 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw01131397000msufc0130.fits
SUN_POSTN:       212.09d {+14h 08m 22s}  -12.97d {-12d 58' 09"}
SUN_DIST:         61.58 [deg]   Sun_angle= -0.9 [hr] (East of Sun)
MOON_POSTN:      242.60d {+16h 10m 24s}  -22.92d {-22d 55' 12"}
MOON_DIST:        71.91 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       80.26, 57.35 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      197.61, 60.26 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.  
COMMENTS:        There is a bright star (mag=3.48) 5.90 arcmin from the BAT position

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Oct 22 19:21:30 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1131397,   Seg_Num: 0
POINT_RA:        225.610d {+15h 02m 26s} (J2000)
POINT_DEC:       +47.471d {+47d 28' 15"} (J2000)
POINT_ROLL:      195.006d
IMG_START_DATE:  19879 TJD;   300 DOY;   22/10/27
IMG_START_TIME:  69349.54 SOD {19:15:49.54} UT,   130.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.779
N_STARS:         23
X_OFFSET:        615 [pixels]
Y_OFFSET:        466 [pixels]
X_MAX:           1574 [pixels]
Y_MAX:           1425 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw01131397000msufc0130.fits
SUN_POSTN:       212.09d {+14h 08m 22s}  -12.97d {-12d 58' 10"}
SUN_DIST:         61.58 [deg]   Sun_angle= -0.9 [hr] (East of Sun)
MOON_POSTN:      242.60d {+16h 10m 25s}  -22.92d {-22d 55' 14"}
MOON_DIST:        71.91 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       80.26, 57.35 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      197.61, 60.26 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.  
COMMENTS:        There is a bright star (mag=3.48) 5.90 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Oct 22 19:22:45 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1131397,   Seg_Num: 0
POINT_RA:        225.610d {+15h 02m 26s} (J2000)
POINT_DEC:       +47.471d {+47d 28' 15"} (J2000)
ROLL:            195.006d
IMG_START_DATE:  19879 TJD;   300 DOY;   22/10/27
IMG_START_TIME:  69349.54 SOD {19:15:49.54} UT,   130.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     688590979
X_OFFSET:        934 [pixels]
Y_OFFSET:        785 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1094
Y_GRB_POS:       945
BINNING_INDEX:   1
IM_URL:          sw01131397000msuni0161.fits
SUN_POSTN:       212.09d {+14h 08m 23s}  -12.97d {-12d 58' 11"}
SUN_DIST:         61.58 [deg]   Sun_angle= -0.9 [hr] (East of Sun)
MOON_POSTN:      242.62d {+16h 10m 28s}  -22.92d {-22d 55' 26"}
MOON_DIST:        71.92 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       80.26, 57.35 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      197.61, 60.26 [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).  
COMMENTS:        There is a bright star (mag=3.48) 5.90 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Oct 22 19:22:59 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1131397,   Seg_Num: 0
POINT_RA:        225.610d {+15h 02m 26s} (J2000)
POINT_DEC:       +47.471d {+47d 28' 15"} (J2000)
ROLL:            195.006d
IMG_START_DATE:  19879 TJD;   300 DOY;   22/10/27
IMG_START_TIME:  69349.54 SOD {19:15:49.54} UT,   130.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     688590979
X_OFFSET:        934 [pixels]
Y_OFFSET:        785 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1094
Y_GRB_POS:       945
BINNING_INDEX:   1
IM_URL:          sw01131397000msuni0161.fits
SUN_POSTN:       212.09d {+14h 08m 23s}  -12.97d {-12d 58' 11"}
SUN_DIST:         61.58 [deg]   Sun_angle= -0.9 [hr] (East of Sun)
MOON_POSTN:      242.62d {+16h 10m 28s}  -22.92d {-22d 55' 29"}
MOON_DIST:        71.92 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       80.26, 57.35 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      197.61, 60.26 [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.  
COMMENTS:        There is a bright star (mag=3.48) 5.90 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Oct 22 19:23:20 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     1131397,   Seg_Num: 0
GRB_RA:          225.6204d {+15h 02m 28.89s} (J2000),
                 225.8139d {+15h 03m 15.33s} (current),
                 225.1965d {+15h 00m 47.17s} (1950)
GRB_DEC:         +47.4423d {+47d 26' 32.2"} (J2000),
                 +47.3536d {+47d 21' 12.9"} (current),
                 +47.6378d {+47d 38' 15.9"} (1950)
GRB_ERROR:       3.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19879 TJD;   300 DOY;   22/10/27
IMG_START_TIME:  69354.00 SOD {19:15:54.00} UT,   135.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       212.09d {+14h 08m 23s}  -12.97d {-12d 58' 11"}
SUN_DIST:         61.56 [deg]   Sun_angle= -0.9 [hr] (East of Sun)
MOON_POSTN:      242.62d {+16h 10m 29s}  -22.93d {-22d 55' 32"}
MOON_DIST:        71.89 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       80.20, 57.36 [deg] galactic lon,lat of the burst
ECL_COORDS:      197.65, 60.24 [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 27 Oct 22 19:29:30 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1131397,   Seg_Num: 0
POINT_RA:        225.610d {+15h 02m 26s} (J2000)
POINT_DEC:       +47.470d {+47d 28' 13"} (J2000)
POINT_ROLL:      195.005d
IMG_START_DATE:  19879 TJD;   300 DOY;   22/10/27
IMG_START_TIME:  69562.07 SOD {19:19:22.07} UT,   343.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.635
N_STARS:         59
X_OFFSET:        375 [pixels]
Y_OFFSET:        226 [pixels]
X_MAX:           1814 [pixels]
Y_MAX:           1665 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw01131397000msufc0343.fits
SUN_POSTN:       212.10d {+14h 08m 24s}  -12.97d {-12d 58' 16"}
SUN_DIST:         61.58 [deg]   Sun_angle= -0.9 [hr] (East of Sun)
MOON_POSTN:      242.69d {+16h 10m 44s}  -22.94d {-22d 56' 31"}
MOON_DIST:        71.95 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       80.26, 57.35 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      197.61, 60.26 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Oct 22 19:30:52 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1131397,   Seg_Num: 0
POINT_RA:        225.610d {+15h 02m 26s} (J2000)
POINT_DEC:       +47.470d {+47d 28' 13"} (J2000)
ROLL:            195.005d
IMG_START_DATE:  19879 TJD;   300 DOY;   22/10/27
IMG_START_TIME:  69562.07 SOD {19:19:22.07} UT,   343.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     688591192
X_OFFSET:        934 [pixels]
Y_OFFSET:        785 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1094
Y_GRB_POS:       945
BINNING_INDEX:   1
IM_URL:          sw01131397000msuni0374.fits
SUN_POSTN:       212.10d {+14h 08m 24s}  -12.97d {-12d 58' 17"}
SUN_DIST:         61.58 [deg]   Sun_angle= -0.9 [hr] (East of Sun)
MOON_POSTN:      242.70d {+16h 10m 48s}  -22.95d {-22d 56' 44"}
MOON_DIST:        71.96 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       80.26, 57.35 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      197.61, 60.26 [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 27 Oct 22 19:29:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1131397,   Seg_Num: 0
POINT_RA:        225.610d {+15h 02m 26s} (J2000)
POINT_DEC:       +47.470d {+47d 28' 13"} (J2000)
POINT_ROLL:      195.005d
IMG_START_DATE:  19879 TJD;   300 DOY;   22/10/27
IMG_START_TIME:  69562.07 SOD {19:19:22.07} UT,   343.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.635
N_STARS:         59
X_OFFSET:        375 [pixels]
Y_OFFSET:        226 [pixels]
X_MAX:           1814 [pixels]
Y_MAX:           1665 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw01131397000msufc0343.fits
SUN_POSTN:       212.10d {+14h 08m 24s}  -12.97d {-12d 58' 16"}
SUN_DIST:         61.58 [deg]   Sun_angle= -0.9 [hr] (East of Sun)
MOON_POSTN:      242.69d {+16h 10m 45s}  -22.94d {-22d 56' 33"}
MOON_DIST:        71.95 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       80.26, 57.35 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      197.61, 60.26 [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 27 Oct 22 19:31:06 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1131397,   Seg_Num: 0
POINT_RA:        225.610d {+15h 02m 26s} (J2000)
POINT_DEC:       +47.470d {+47d 28' 13"} (J2000)
ROLL:            195.005d
IMG_START_DATE:  19879 TJD;   300 DOY;   22/10/27
IMG_START_TIME:  69562.07 SOD {19:19:22.07} UT,   343.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     688591192
X_OFFSET:        934 [pixels]
Y_OFFSET:        785 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1094
Y_GRB_POS:       945
BINNING_INDEX:   1
IM_URL:          sw01131397000msuni0374.fits
SUN_POSTN:       212.10d {+14h 08m 24s}  -12.97d {-12d 58' 18"}
SUN_DIST:         61.58 [deg]   Sun_angle= -0.9 [hr] (East of Sun)
MOON_POSTN:      242.70d {+16h 10m 48s}  -22.95d {-22d 56' 46"}
MOON_DIST:        71.96 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       80.26, 57.35 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      197.61, 60.26 [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 27 Oct 22 19:30:54 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     1131397,   Seg_Num: 0
GRB_RA:          225.6209d {+15h 02m 29.01s} (J2000),
                 225.8144d {+15h 03m 15.45s} (current),
                 225.1970d {+15h 00m 47.29s} (1950)
GRB_DEC:         +47.4419d {+47d 26' 30.8"} (J2000),
                 +47.3532d {+47d 21' 11.5"} (current),
                 +47.6374d {+47d 38' 14.4"} (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:  19879 TJD;   300 DOY;   22/10/27
IMG_START_TIME:  69354.00 SOD {19:15:54.00} UT,   135.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       212.10d {+14h 08m 24s}  -12.97d {-12d 58' 17"}
SUN_DIST:         61.56 [deg]   Sun_angle= -0.9 [hr] (East of Sun)
MOON_POSTN:      242.70d {+16h 10m 48s}  -22.95d {-22d 56' 44"}
MOON_DIST:        71.93 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       80.20, 57.36 [deg] galactic lon,lat of the burst
ECL_COORDS:      197.65, 60.24 [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 #32867
A. Y. Lien (U Tampa), E. Ambrosi (INAF-IASFPA), A. D'Ai (INAF-IASFPA), V. D'Elia (SSDC & INAF-OAR), S. Dichiara (PSU), J.D. Gropp (PSU), J. A. Kennea (PSU), N. J. Klingler (GSFC/UMBC/CRESSTII), H. A. Krimm (NSF), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), T. M. Parsotan (GSFC/UMBC/CRESSTII) and B. Sbarufatti (INAF-OAB) report on behalf of the Neil Gehrels Swift Observatory Team:
At 19:13:38 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 221027B (trigger=1131397). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 225.603, +47.448 which is
```
   RA(J2000) = 15h 02m 25s
   Dec(J2000) = +47d 26' 53"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 15 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 19:15:44.9 UT, 126.2 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 225.62105, 47.44193 which is equivalent to:
```
   RA(J2000)  = 15h 02m 29.05s
   Dec(J2000) = +47d 26' 30.9"
```
with an uncertainty of 1.9 arcseconds (radius, 90% containment). This location is 49 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 (2.88 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 2.4 (+1.76/-1.55) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 130 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 0.033.
Burst Advocate for this burst is A. Y. Lien (yarleen AT gmail.com). 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 27 Oct 22 19:35:48 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1131397,   Seg_Num: 0
POINT_RA:        225.609d {+15h 02m 26s} (J2000)
POINT_DEC:       +47.471d {+47d 28' 15"} (J2000)
POINT_ROLL:      195.005d
IMG_START_DATE:  19879 TJD;   300 DOY;   22/10/27
IMG_START_TIME:  70091.59 SOD {19:28:11.59} UT,   872.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.373
N_STARS:         90
X_OFFSET:        375 [pixels]
Y_OFFSET:        226 [pixels]
X_MAX:           1814 [pixels]
Y_MAX:           1665 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw01131397000msufc0872.fits
SUN_POSTN:       212.10d {+14h 08m 25s}  -12.97d {-12d 58' 22"}
SUN_DIST:         61.59 [deg]   Sun_angle= -0.9 [hr] (East of Sun)
MOON_POSTN:      242.75d {+16h 11m 00s}  -22.96d {-22d 57' 30"}
MOON_DIST:        71.98 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       80.26, 57.35 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      197.60, 60.26 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 Oct 22 19:37:13 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1131397,   Seg_Num: 0
POINT_RA:        225.609d {+15h 02m 26s} (J2000)
POINT_DEC:       +47.471d {+47d 28' 15"} (J2000)
ROLL:            195.005d
IMG_START_DATE:  19879 TJD;   300 DOY;   22/10/27
IMG_START_TIME:  70091.59 SOD {19:28:11.59} UT,   872.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     688591721
X_OFFSET:        934 [pixels]
Y_OFFSET:        785 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1094
Y_GRB_POS:       945
BINNING_INDEX:   1
IM_URL:          sw01131397000msuni0903.fits
SUN_POSTN:       212.10d {+14h 08m 25s}  -12.97d {-12d 58' 23"}
SUN_DIST:         61.59 [deg]   Sun_angle= -0.9 [hr] (East of Sun)
MOON_POSTN:      242.77d {+16h 11m 04s}  -22.96d {-22d 57' 44"}
MOON_DIST:        71.99 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       80.26, 57.35 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      197.60, 60.26 [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 27 Oct 22 19:36:03 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1131397,   Seg_Num: 0
POINT_RA:        225.609d {+15h 02m 26s} (J2000)
POINT_DEC:       +47.471d {+47d 28' 15"} (J2000)
POINT_ROLL:      195.005d
IMG_START_DATE:  19879 TJD;   300 DOY;   22/10/27
IMG_START_TIME:  70091.59 SOD {19:28:11.59} UT,   872.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.373
N_STARS:         90
X_OFFSET:        375 [pixels]
Y_OFFSET:        226 [pixels]
X_MAX:           1814 [pixels]
Y_MAX:           1665 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw01131397000msufc0872.fits
SUN_POSTN:       212.10d {+14h 08m 25s}  -12.97d {-12d 58' 22"}
SUN_DIST:         61.59 [deg]   Sun_angle= -0.9 [hr] (East of Sun)
MOON_POSTN:      242.75d {+16h 11m 01s}  -22.96d {-22d 57' 33"}
MOON_DIST:        71.98 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       80.26, 57.35 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      197.60, 60.26 [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 27 Oct 22 19:37:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1131397,   Seg_Num: 0
POINT_RA:        225.609d {+15h 02m 26s} (J2000)
POINT_DEC:       +47.471d {+47d 28' 15"} (J2000)
ROLL:            195.005d
IMG_START_DATE:  19879 TJD;   300 DOY;   22/10/27
IMG_START_TIME:  70091.59 SOD {19:28:11.59} UT,   872.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     688591721
X_OFFSET:        934 [pixels]
Y_OFFSET:        785 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1094
Y_GRB_POS:       945
BINNING_INDEX:   1
IM_URL:          sw01131397000msuni0903.fits
SUN_POSTN:       212.10d {+14h 08m 25s}  -12.97d {-12d 58' 23"}
SUN_DIST:         61.59 [deg]   Sun_angle= -0.9 [hr] (East of Sun)
MOON_POSTN:      242.77d {+16h 11m 04s}  -22.96d {-22d 57' 45"}
MOON_DIST:        71.99 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       80.26, 57.35 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      197.60, 60.26 [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 Circular #32868
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 1519 s of XRT Photon Counting mode data and 2 UVOT images for GRB 221027B, 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 = 225.62095, +47.44205 which is equivalent to:
```
RA (J2000): 15h 02m 29.03s
Dec (J2000): +47d 26' 31.4"
```
with an uncertainty of 2.2 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 #32869
Y.-D. Hu, E. Fernandez-Garcia, A. J. Castro-Tirado, M. D. Caballero-Garcia, R. Sanchez-Ramirez, I. Perez-Garcia (IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco, A. Reina (Univ. de Malaga) and F. Rendon (IAA-CSIC and INTA-CEDEA) on behalf of a larger collaboration, report:
Following the detection of GRB 221027B by Swift (Lien et al., GCNC 32867), the 0.3m BOOTES-1B robotic telescope in Mazagon (Huelva), southern Spain, automatically responded to this burst on Oct 27 at 19:19:30 UT (~6 min after trigger). In the co-added frame (20 x 10 s, clear filter), no source is detected within the enhanced XRT error position (Beardmore et al., GCNC 32868) down to 17.3 mag, which is consistent with the non-detection reported by UVOT (Lien et al., GCNC 32867).
We thank the staff at INTA-CEDEA for their excellent support.
GCN Circular #32870
M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR), A. Tohuvavohu (U. Toronto), D.N. Burrows (PSU), J. D. Gropp (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), B. Sbarufatti (INAF-OAB) and A.Y. Lien report on behalf of the Swift-XRT team:
We have analysed 7.1 ks of XRT data for GRB 221027B (Lien et al. GCN Circ. 32867), from 109 s to 24.9 ks after the BAT trigger. The data comprise 8 s in Windowed Timing (WT) mode (taken while Swift was slewing), with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 32868).
The light curve can be modelled with a power-law decay with a decay index of alpha=0.77 (+/-0.04).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.95 (+/-0.16). The best-fitting absorption column is 1.3 (+0.5, -0.4) x 10^21 cm^-2, in excess of the Galactic value of 2.9 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 3.5 x 10^-11 (4.3 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.3 (+0.5, -0.4) x 10^21 cm^-2
Galactic foreground: 2.9 x 10^20 cm^-2
Excess significance: 3.7 sigma
Photon index:	     1.95 (+/-0.16)
```
If the light curve continues to decay with a power-law decay index of 0.77, the count rate at T+24 hours will be 0.015 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 5.2 x 10^-13 (6.5 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01131397.
This circular is an official product of the Swift-XRT team.
GCN Circular #32871
V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin (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. Gres, N.M. Budnev (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),
A. Gabovich, V.Yurkov (Blagoveschensk Educational State University)
MASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB 221027B ( A. Y. Lien et al., GCN 32867) errorbox 21757 sec after notice time and 22094 sec after trigger time at 2022-10-28 01:21:53 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 79 deg. The sun altitude is -31.2 deg.
The galactic latitude b = 57 deg., longitude l = 80 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2136676
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

   22185 |      MASTER-Tavrida |   C |   180 | 17.6 |        
   22185 |      MASTER-Tavrida |   C |   180 | 15.2 |        
   22376 |      MASTER-Tavrida |   C |   180 | 17.9 |        
   22376 |      MASTER-Tavrida |   C |   180 | 15.1 |        
   22662 |      MASTER-Tavrida |   C |   180 | 18.3 |        
   22662 |      MASTER-Tavrida |   C |   180 | 15.4 |        
   23028 |      MASTER-Tavrida |   C |   180 | 18.3 |        
   23028 |      MASTER-Tavrida |   C |   180 | 16.0 |        
   23985 |      MASTER-Tavrida |   C |   180 | 18.5 |        
   23985 |      MASTER-Tavrida |   C |   180 | 18.0 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #32873
Martin Jelinek, Jan Strobl, Rene Hudec and Cyril Polasek (ASU CAS Ondrejov, CZ), Sergey Karpov, Martin Masek, Petr Janecek, Jakub Jurysek, Jan Ebr, Ronan Cunniffe, Petr Travnicek and Michael Prouza (Institute of Physics, Prague, CZ)
report:
The 2x20cm robotic telescope BART-SBT in Ondrejov (CZ) reacted robotically to the Swift alert of GRB221027B (Lien et al., GCNC 32867 and Perri et al. GCNC 32870, GCNC 29119 and 29124), obtaining a series of 12s unfiltered frames at 19:19:46 UT, i.e. 367s post trigger.
The 25cm robotic telescope FRAM-ORM at La Palma (Spain) reacted to the same alert, providing a series of 60s unfiltered images from 19:28:20 UT, i.e. 882s post trigger.
Similarly to Hu et al. (GCNC 32869) and Lipunov et al. (GCNC 32871), we do not detect any new or strongly variable source neither in single or in combined frames with the following limits:
```
Tel.    T-T0[mid,s]  Texp[s]  Limit[ABmag]  Note
SBT     374          12       <15.5         (similar during the following
30 min)
SBT     494          240      <17.0
SBT     674          600      <17.3
SBT     1574         2400     <17.7
FRAM    912          60       <17.0         (similar next 60 minutes)
FRAM    1238         10x60    <18.0
```
GCN Circular #32875
A. Belles (PSU) and A. Y. Lien (U. Tampa) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 221027B 131 s after the BAT trigger (Lien et al., GCN Circ. 32867). No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 32868) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC           131          281          147         >21.1
u_FC               344          594          246         >20.2
white              131         1544          392         >21.5
v                  673         1594          117         >19.2
b                  599         1520           97         >19.4
u                  344         1661          335         >20.4
w1                 722         1644           97         >18.8
m2                 698          718           19         >17.6
w2                 111          841           30         >19.2
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.033 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #32880
Rosa L. Becerra (UNAM), Alan M. Watson (UNAM), Nat Butler (ASU), Simone Dichiara (PSU), Tzveti Dimitrova (ASU), Oc�lotl L�pez (UNAM), Diego Gonz�lez (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Margarita Pereyra (UNAM), Eleonora Troja (UTV/ASU) and report:
We observed the field of the GRB 221027B (Lien et al., GCN Circ. 32867) with the COATLI 50-cm telescope and HUITZI f/8 imager at the Observatorio Astron�mico Nacional on the Sierra de San Pedro M�rtir ( http://coatli.astroscu.unam.mx) from 2022-10-28 01:47 UTC to 02:13 UTC (6.6 hours after the trigger), obtaining a total of 750 seconds of exposure in the r filter.
We do not detect any uncataloged sources within the XRT error region (Beardmore et al., GCN Circ. 32868) to a 3-sigma limit of r > 21.4 mag.
Our photometry is calibrated against the Pan-STARRS1 catalog, is on an approximate AB system, and is not corrected for Galactic extinction in the direction of the GRB.
We thank the COATLI/HUITZI technical team and the staff of the Observatorio Astron�mico Nacional.
GCN Circular #32892
C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), D. M. Palmer (LANL), T. Parsotan (GSFC/UMBC), T. Sakamoto (AGU), M. Stamatikos (OSU) (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 221027B (trigger #1131397) (Lien et al., GCN Circ. 32867). The BAT ground-calculated position is RA, Dec = 225.601, 47.451 deg which is
```
   RA(J2000)  =  15h 02m 24.2s
   Dec(J2000) = +47d 27' 04.4"
```
with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 45%.
The mask-weighted light curve shows a structure with two pulses that start at ~T-6 s and end at ~T+4 s. The first weaker peak occurs at ~T-5 s, followed by the main peak that occurs at ~T0. T90 (15-350 keV) is 8.66 +- 1.10 sec (estimated error including systematics).
The time-averaged spectrum from T-5.98 to T+4.20 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.39 +- 0.19. The fluence in the 15-150 keV band is 5.8 +- 0.6 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.08 sec in the 15-150 keV band is 3.4 +- 0.4 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/1131397/BA/
GCN Circular #32905
N. Kochiashvili (AbAO), Z. Vidadi (ShAO), D. A. Kann (Goethe Univ.), P. Gokuldass (Florida Tech.), S. Beradze (AbAO), Sh. Aghayeva (ShAO), R. Le Montagner (IJCLab), C. Rinner, Z. Benkhaldoun (OUCA), S. Antier (OCA/Artemis), J. Ali, A. Kaouech (OUCA/KNC), and Sergey Karpov (FZU) report on behalf of the GRANDMA collaboration:
The GRANDMA telescope network responded to the Swift-BAT alert of GRB 221027B (Lien et al., GCN 32867, Beardmore et al., GCN 32868, Perri et al., GCN 32870, Markwardt et al., GCN 32892). No optical afterglow consistent with the XRT position (Beardmore et al., GCN 32868) is detected by Swift in the initial UVOT exposures (Belles & Lien, GCN 32875).
The first observations started 23.8 hours after the BAT trigger time. The optical counterpart of the afterglow was not detected in our observations.
In the following table we report the preliminary photometry of our observations. Upper limits are reported at the 5-sigma limit, in the AB system.
```
T-T0 (hr)| MJD       | Obser.   |Exposure    | Filter | Upp.Lim.
-----------------------------------------------------------------
23.7956 | 59880.79262 | KNC-HAO | 15 x 120 s | L      | 20.5
```
HAO data have been calibrated with PS1 catalog. Values are not corrected for the Galactic extinction E(B-V) = 0.0262 mag (Schlafly & Finkbeiner 2011).
Our upper limits are in agreement with other non-detections from Swift UVOT (Belles & Lien, GCN 32875), BOOTES-1 (Hu et al., GCN 32869), MASTER (Lipunov et al., GCN 32871), BART-SBT and FRAM-ORM (Jelinek et al., GCN 32873), and COATLI (Becerra et al., GCN 32880).
GRANDMA is a worldwide coordinated telescope network (grandma.ijclab.in2p3.fr) devoted to the observation of transients in the context of multi-messenger astrophysics (Antier et al. 2020 MNRAS 497, 5518). Kilonova-Catcher (KNC) is the citizen science program of GRANDMA (http://kilonovacatcher.in2p3.fr/).

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Jochen Greiner, last update: 03-Nov-2022 [Disclaimer]