Gamma-ray Burst 210712A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Jul 21 09:43:32 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1059881,   Seg_Num: 0
GRB_RA:           97.337d {+06h 29m 21s} (J2000),
                  97.528d {+06h 30m 07s} (current),
                  96.893d {+06h 27m 34s} (1950)
GRB_DEC:         -35.393d {-35d 23' 33"} (J2000),
                 -35.408d {-35d 24' 29"} (current),
                 -35.358d {-35d 21' 29"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3333 [cnts]    Image_Peak=287 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       16354 [cnts]
BKG_TIME:        34980.64 SOD {09:43:00.64} UT
BKG_DUR:         8 [sec]
GRB_DATE:        19407 TJD;   193 DOY;   21/07/12
GRB_TIME:        34991.90 SOD {09:43:11.90} UT
GRB_PHI:         -150.81 [deg]
GRB_THETA:        31.77 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     25.49 [sigma]
IMAGE_SIGNIF:    13.19 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +2  +0  +0 -51  +0 
SUN_POSTN:       111.93d {+07h 27m 44s}  +21.91d {+21d 54' 20"}
SUN_DIST:         58.92 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      141.83d {+09h 27m 20s}  +20.02d {+20d 00' 57"}
MOON_DIST:        69.53 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      243.52,-19.51 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      101.51,-58.54 [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 = 65.83,-11.07 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=647775795).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 12 Jul 21 09:43:37 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      46
TRIGGER_NUM:     647775795
GRB_RA:          111.233d {+07h 24m 56s} (J2000),
                 111.414d {+07h 25m 39s} (current),
                 110.813d {+07h 23m 15s} (1950)
GRB_DEC:         -40.267d {-40d 16' 00"} (J2000),
                 -40.310d {-40d 18' 36"} (current),
                 -40.167d {-40d 10' 00"} (1950)
GRB_ERROR:       24.40 [deg radius, statistical plus systematic]
GRB_INTEN:       120 [cnts/sec]
DATA_SIGNIF:     6.00 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        19407 TJD;   193 DOY;   21/07/12
GRB_TIME:        34990.98 SOD {09:43:10.98} UT
GRB_PHI:          36.00 [deg]
GRB_THETA:        25.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.87
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       1,1,0, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       111.93d {+07h 27m 44s}  +21.91d {+21d 54' 20"}
SUN_DIST:         62.22 [deg]   Sun_angle= 0.0 [hr] (West of Sun)
MOON_POSTN:      141.83d {+09h 27m 20s}  +20.02d {+20d 00' 57"}
MOON_DIST:        66.64 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      252.59,-11.29 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      124.95,-61.15 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210712405/quicklook/glg_lc_medres34_bn210712405.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 95.65,-12.47 [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=1059881).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 12 Jul 21 09:43:49 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      58
TRIGGER_NUM:     647775795
GRB_RA:          105.317d {+07h 01m 16s} (J2000),
                 105.503d {+07h 02m 01s} (current),
                 104.884d {+06h 59m 32s} (1950)
GRB_DEC:         -37.733d {-37d 43' 59"} (J2000),
                 -37.765d {-37d 45' 54"} (current),
                 -37.661d {-37d 39' 38"} (1950)
GRB_ERROR:       16.42 [deg radius, statistical plus systematic]
GRB_INTEN:       104 [cnts/sec]
DATA_SIGNIF:     9.00 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        19407 TJD;   193 DOY;   21/07/12
GRB_TIME:        34990.98 SOD {09:43:10.98} UT
GRB_PHI:          40.00 [deg]
GRB_THETA:        30.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.87
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       1,1,0, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       111.93d {+07h 27m 44s}  +21.91d {+21d 54' 19"}
SUN_DIST:         59.98 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:      141.83d {+09h 27m 20s}  +20.02d {+20d 00' 55"}
MOON_DIST:        67.12 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      248.26,-14.41 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      114.60,-59.87 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210712405/quicklook/glg_lc_medres34_bn210712405.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 95.65,-12.47 [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=1059881).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 12 Jul 21 09:43:59 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     647775795
GRB_RA:          109.260d {+07h 17m 02s} (J2000),
                 109.456d {+07h 17m 49s} (current),
                 108.805d {+07h 15m 13s} (1950)
GRB_DEC:         -35.290d {-35d 17' 23"} (J2000),
                 -35.330d {-35d 19' 46"} (current),
                 -35.199d {-35d 11' 56"} (1950)
GRB_ERROR:       8.78 [deg radius, statistical only]
DATA_SIGNIF:     14.00 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        19407 TJD;   193 DOY;   21/07/12
GRB_TIME:        34990.98 SOD {09:43:10.98} UT
GRB_PHI:          32.00 [deg]
GRB_THETA:        30.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       111.93d {+07h 27m 44s}  +21.91d {+21d 54' 19"}
SUN_DIST:         57.28 [deg]   Sun_angle= 0.2 [hr] (West of Sun)
MOON_POSTN:      141.84d {+09h 27m 21s}  +20.01d {+20d 00' 53"}
MOON_DIST:        63.29 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      247.34,-10.51 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      119.43,-56.78 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210712405/quicklook/glg_lc_medres34_bn210712405.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_647775795.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=1059881).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 12 Jul 21 09:45:23 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     647775795
GRB_RA:          111.260d {+07h 25m 02s} (J2000),
                 111.460d {+07h 25m 50s} (current),
                 110.795d {+07h 23m 11s} (1950)
GRB_DEC:         -34.140d {-34d 08' 23"} (J2000),
                 -34.184d {-34d 11' 00"} (current),
                 -34.040d {-34d 02' 23"} (1950)
GRB_ERROR:       6.50 [deg radius, statistical only]
DATA_SIGNIF:     12.30 [sigma]
DATA_INTERVAL:   10.240 [sec]
GRB_DATE:        19407 TJD;   193 DOY;   21/07/12
GRB_TIME:        34990.98 SOD {09:43:10.98} UT
GRB_PHI:          28.00 [deg]
GRB_THETA:        30.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       111.93d {+07h 27m 44s}  +21.91d {+21d 54' 19"}
SUN_DIST:         56.09 [deg]   Sun_angle= 0.0 [hr] (West of Sun)
MOON_POSTN:      141.85d {+09h 27m 24s}  +20.01d {+20d 00' 41"}
MOON_DIST:        61.43 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      247.04, -8.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      121.78,-55.26 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210712405/quicklook/glg_lc_medres34_bn210712405.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_647775795.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the SWIFT_BAT event (trignum=1059881).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 12 Jul 21 09:52:43 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     647775795
GRB_RA:          112.130d {+07h 28m 31s} (J2000),
                 112.335d {+07h 29m 20s} (current),
                 111.653d {+07h 26m 37s} (1950)
GRB_DEC:         -32.420d {-32d 25' 11"} (J2000),
                 -32.465d {-32d 27' 54"} (current),
                 -32.316d {-32d 18' 57"} (1950)
GRB_ERROR:       6.44 [deg radius, statistical only]
GRB_DATE:        19407 TJD;   193 DOY;   21/07/12
GRB_TIME:        34990.98 SOD {09:43:10.98} UT
GRB_PHI:          25.00 [deg]
GRB_THETA:        31.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       111.94d {+07h 27m 45s}  +21.90d {+21d 54' 16"}
SUN_DIST:         54.37 [deg]   Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN:      141.92d {+09h 27m 40s}  +19.99d {+19d 59' 35"}
MOON_DIST:        59.60 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      245.84, -7.09 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      122.24,-53.41 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210712405/quicklook/glg_lc_medres34_bn210712405.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210712405/quicklook/glg_locplot_all_bn210712405.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=1059881).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Jul 21 09:45:11 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     1059881,   Seg_Num: 0
GRB_RA:           97.3303d {+06h 29m 19.2s} (J2000),
                  97.5217d {+06h 30m 05.2s} (current),
                  96.8858d {+06h 27m 32.5s} (1950)
GRB_DEC:         -35.3739d {-35d 22' 26.0"} (J2000),
                 -35.3894d {-35d 23' 21.8"} (current),
                 -35.3394d {-35d 20' 22.0"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       120 [cnts]
IMG_START_DATE:  19407 TJD;   193 DOY;   21/07/12
IMG_START_TIME:  35072.54 SOD {09:44:32.54} UT,   80.6 [sec] since BAT Trigger Time
CENTROID_X:      253.26,  raw= 253  [pixels]
CENTROID_Y:      330.70,  raw= 331  [pixels]
ROLL:            15.85 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   76.87
GRB_POS_XRT_Z:   -127.61
IMAGE_URL:       sw01059881000msxps_rw.img
SUN_POSTN:       111.93d {+07h 27m 44s}  +21.91d {+21d 54' 19"}
SUN_DIST:         58.90 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      141.85d {+09h 27m 23s}  +20.01d {+20d 00' 43"}
MOON_DIST:        69.52 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      243.50,-19.51 [deg] galactic lon,lat of the burst
ECL_COORDS:      101.49,-58.52 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Jul 21 09:45:13 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     1059881,   Seg_Num: 0
GRB_RA:           97.3303d {+06h 29m 19.2s} (J2000),
                  97.5217d {+06h 30m 05.2s} (current),
                  96.8858d {+06h 27m 32.5s} (1950)
GRB_DEC:         -35.3739d {-35d 22' 26.0"} (J2000),
                 -35.3894d {-35d 23' 21.8"} (current),
                 -35.3394d {-35d 20' 22.0"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       120 [cnts]
IMG_START_DATE:  19407 TJD;   193 DOY;   21/07/12
IMG_START_TIME:  35072.54 SOD {09:44:32.54} UT,   80.6 [sec] since BAT Trigger Time
CENTROID_X:      253.26,  raw= 253  [pixels]
CENTROID_Y:      330.70,  raw= 331  [pixels]
ROLL:            15.85 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   76.87
GRB_POS_XRT_Z:   -127.61
IMAGE_URL:       sw01059881000msxps_rw.img
SUN_POSTN:       111.93d {+07h 27m 44s}  +21.91d {+21d 54' 19"}
SUN_DIST:         58.90 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      141.85d {+09h 27m 23s}  +20.01d {+20d 00' 42"}
MOON_DIST:        69.52 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      243.50,-19.51 [deg] galactic lon,lat of the burst
ECL_COORDS:      101.49,-58.52 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Jul 21 09:45:01 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     1059881,   Seg_Num: 0
GRB_RA:           97.3303d {+06h 29m 19.27s} (J2000),
                  97.5217d {+06h 30m 05.21s} (current),
                  96.8858d {+06h 27m 32.59s} (1950)
GRB_DEC:         -35.3739d {-35d 22' 26.0"} (J2000),
                 -35.3894d {-35d 23' 21.8"} (current),
                 -35.3394d {-35d 20' 22.0"} (1950)
GRB_ERROR:       4.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       3.52e-09 [erg/cm2/sec]
GRB_SIGNIF:      10.95 [sigma]
IMG_START_DATE:  19407 TJD;   193 DOY;   21/07/12
IMG_START_TIME:  35072.54 SOD {09:44:32.54} UT,   80.6 [sec] since BAT Trigger Time
TAM[0-3]:        327.68 237.17 261.72 243.22
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       111.93d {+07h 27m 44s}  +21.91d {+21d 54' 19"}
SUN_DIST:         58.90 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      141.85d {+09h 27m 23s}  +20.01d {+20d 00' 44"}
MOON_DIST:        69.52 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      243.50,-19.51 [deg] galactic lon,lat of the burst
ECL_COORDS:      101.49,-58.52 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.18 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Jul 21 09:46:57 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1059881,   Seg_Num: 0
GRB_RA:           97.337d {+06h 29m 21s} (J2000),
                  97.528d {+06h 30m 07s} (current),
                  96.893d {+06h 27m 34s} (1950)
GRB_DEC:         -35.393d {-35d 23' 33"} (J2000),
                 -35.408d {-35d 24' 29"} (current),
                 -35.358d {-35d 21' 29"} (1950)
GRB_DATE:        19407 TJD;   193 DOY;   21/07/12
GRB_TIME:        34991.90 SOD {09:43:11.90} UT
TRIGGER_INDEX:   146
GRB_PHI:         -150.81 [deg]
GRB_THETA:        31.77 [deg]
DELTA_TIME:      -5.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     25.49 [sigma]
IMAGE_SIGNIF:    13.19 [sigma]
LC_URL:          sw01059881000msb.lc
SUN_POSTN:       111.93d {+07h 27m 44s}  +21.91d {+21d 54' 18"}
SUN_DIST:         58.92 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      141.86d {+09h 27m 27s}  +20.01d {+20d 00' 27"}
MOON_DIST:        69.54 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      243.52,-19.51 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      101.51,-58.54 [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 = 65.83,-11.07 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Jul 21 09:48:05 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1059881,   Seg_Num: 0
POINT_RA:         97.344d {+06h 29m 22s} (J2000)
POINT_DEC:       -35.413d {-35d 24' 47"} (J2000)
POINT_ROLL:      15.847d
IMG_START_DATE:  19407 TJD;   193 DOY;   21/07/12
IMG_START_TIME:  35082.05 SOD {09:44:42.05} UT,   90.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.202
N_STARS:         104
X_OFFSET:        560 [pixels]
Y_OFFSET:        400 [pixels]
X_MAX:           1519 [pixels]
Y_MAX:           1359 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    10
SL_URL:          sw01059881000msufc0090.fits
SUN_POSTN:       111.93d {+07h 27m 44s}  +21.90d {+21d 54' 18"}
SUN_DIST:         58.94 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      141.87d {+09h 27m 30s}  +20.00d {+20d 00' 17"}
MOON_DIST:        69.55 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      243.54,-19.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      101.52,-58.56 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Jul 21 09:56:09 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1059881,   Seg_Num: 0
POINT_RA:         97.345d {+06h 29m 23s} (J2000)
POINT_DEC:       -35.415d {-35d 24' 54"} (J2000)
POINT_ROLL:      15.845d
IMG_START_DATE:  19407 TJD;   193 DOY;   21/07/12
IMG_START_TIME:  35295.33 SOD {09:48:15.33} UT,   303.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.516
N_STARS:         54
X_OFFSET:        627 [pixels]
Y_OFFSET:        282 [pixels]
X_MAX:           1586 [pixels]
Y_MAX:           1241 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw01059881000msufc0303.fits
SUN_POSTN:       111.94d {+07h 27m 46s}  +21.90d {+21d 54' 15"}
SUN_DIST:         58.94 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      141.95d {+09h 27m 47s}  +19.98d {+19d 59' 05"}
MOON_DIST:        69.58 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      243.55,-19.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      101.52,-58.56 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Jul 21 09:56:26 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1059881,   Seg_Num: 0
POINT_RA:         97.345d {+06h 29m 23s} (J2000)
POINT_DEC:       -35.415d {-35d 24' 54"} (J2000)
POINT_ROLL:      15.845d
IMG_START_DATE:  19407 TJD;   193 DOY;   21/07/12
IMG_START_TIME:  35295.33 SOD {09:48:15.33} UT,   303.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.516
N_STARS:         54
X_OFFSET:        627 [pixels]
Y_OFFSET:        282 [pixels]
X_MAX:           1586 [pixels]
Y_MAX:           1241 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw01059881000msufc0303.fits
SUN_POSTN:       111.94d {+07h 27m 46s}  +21.90d {+21d 54' 15"}
SUN_DIST:         58.94 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      141.95d {+09h 27m 48s}  +19.98d {+19d 59' 02"}
MOON_DIST:        69.58 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      243.55,-19.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      101.52,-58.56 [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:     Mon 12 Jul 21 09:57:32 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1059881,   Seg_Num: 0
POINT_RA:         97.345d {+06h 29m 23s} (J2000)
POINT_DEC:       -35.415d {-35d 24' 54"} (J2000)
ROLL:            15.845d
IMG_START_DATE:  19407 TJD;   193 DOY;   21/07/12
IMG_START_TIME:  35295.33 SOD {09:48:15.33} UT,   303.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     647776122
X_OFFSET:        947 [pixels]
Y_OFFSET:        602 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1107
Y_GRB_POS:       762
BINNING_INDEX:   1
IM_URL:          sw01059881000msuni0331.fits
SUN_POSTN:       111.94d {+07h 27m 46s}  +21.90d {+21d 54' 15"}
SUN_DIST:         58.94 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      141.96d {+09h 27m 50s}  +19.98d {+19d 58' 52"}
MOON_DIST:        69.59 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      243.55,-19.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      101.52,-58.56 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Jul 21 09:56:35 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     1059881,   Seg_Num: 0
GRB_RA:           97.3319d {+06h 29m 19.65s} (J2000),
                  97.5233d {+06h 30m 05.60s} (current),
                  96.8874d {+06h 27m 32.97s} (1950)
GRB_DEC:         -35.3716d {-35d 22' 17.7"} (J2000),
                 -35.3871d {-35d 23' 13.5"} (current),
                 -35.3371d {-35d 20' 13.7"} (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:  19407 TJD;   193 DOY;   21/07/12
IMG_START_TIME:  35244.00 SOD {09:47:24.00} UT,   252.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       111.94d {+07h 27m 46s}  +21.90d {+21d 54' 15"}
SUN_DIST:         58.90 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      141.95d {+09h 27m 48s}  +19.98d {+19d 59' 01"}
MOON_DIST:        69.56 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      243.50,-19.50 [deg] galactic lon,lat of the burst
ECL_COORDS:      101.49,-58.52 [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 0.11% < P(seren) < 0.58%.

GCN Circular #30447
B. Sbarufatti (PSU), H. A. Krimm (NSF) and K. L. Page (U Leicester) report on behalf of the Neil Gehrels Swift Observatory Team:
At 09:43:11 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 210712A (trigger=1059881). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 97.337, -35.393 which is
```
   RA(J2000) = 06h 29m 21s
   Dec(J2000) = -35d 23' 33"
```
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 20 sec, followed by lower-level extended emission. The peak count rate was ~2600 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 09:44:32.5 UT, 80.6 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source with an enhanced position: RA, Dec 97.3319, -35.3717 which is equivalent to:
```
   RA(J2000)  = 06h 29m 19.66s
   Dec(J2000) = -35d 22' 18.0"
```
with an uncertainty of 1.9 arcseconds (radius, 90% containment). 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 (8.88 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 6.5 (+5.28/-4.30) x 10^21 cm^-2 (90% confidence).
The initial flux in the 2.5 s image was 3.52e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 90 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 none of the XRT error circle. 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 0.076.
Burst Advocate for this burst is B. Sbarufatti (bxs60 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 Circular #30448
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (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, O.Ershova (Irkutsk State University, API),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University)
MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB210712.40 (trigger No 647775795,07h 28m 31.20s , -32d 25m 12.0s, R=6.44) errorbox 3249 sec after notice time and 3283 sec after trigger time at 2021-07-12 10:37:54 UT, with upper limit up to 16.8 mag. Observations started at twilight. The observations began at zenith distance = 74 deg. The sun altitude is -11.6 deg.
The galactic latitude b = -7 deg., longitude l = 246 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1658321
We obtain a following upper limits.
```
Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

    3313 | 2021-07-12 10:37:54 |         MASTER-OAFA | (07h 24m 58.96s , -33d 38m 36.1s) |   C |    60 | 16.8 |        
    3393 | 2021-07-12 10:39:13 |         MASTER-OAFA | (07h 34m 24.93s , -33d 39m 15.2s) |   C |    60 | 16.6 |        
    3473 | 2021-07-12 10:40:33 |         MASTER-OAFA | (07h 15m 41.23s , -31d 44m 10.0s) |   C |    60 | 16.5 |        
    3552 | 2021-07-12 10:41:53 |         MASTER-OAFA | (07h 25m 01.46s , -31d 45m 07.0s) |   C |    60 | 16.3 |        
    3632 | 2021-07-12 10:43:12 |         MASTER-OAFA | (07h 16m 28.78s , -35d 32m 43.2s) |   C |    60 | 16.4 |        
    3714 | 2021-07-12 10:44:34 |         MASTER-OAFA | (07h 26m 14.12s , -35d 31m 23.3s) |   C |    60 | 16.0 |        
    3793 | 2021-07-12 10:45:53 |         MASTER-OAFA | (07h 06m 44.72s , -33d 40m 00.9s) |   C |    60 | 16.4 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Jul 21 09:49:04 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1059881,   Seg_Num: 0
POINT_RA:         97.344d {+06h 29m 22s} (J2000)
POINT_DEC:       -35.413d {-35d 24' 47"} (J2000)
ROLL:            15.847d
IMG_START_DATE:  19407 TJD;   193 DOY;   21/07/12
IMG_START_TIME:  35082.05 SOD {09:44:42.05} UT,   90.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     647775909
X_OFFSET:        947 [pixels]
Y_OFFSET:        602 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1107
Y_GRB_POS:       762
BINNING_INDEX:   1
IM_URL:          sw01059881000msuni0118.fits
SUN_POSTN:       111.94d {+07h 27m 44s}  +21.90d {+21d 54' 18"}
SUN_DIST:         58.94 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      141.88d {+09h 27m 32s}  +20.00d {+20d 00' 08"}
MOON_DIST:        69.56 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      243.54,-19.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      101.52,-58.56 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Jul 21 09:49:16 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1059881,   Seg_Num: 0
POINT_RA:         97.344d {+06h 29m 22s} (J2000)
POINT_DEC:       -35.413d {-35d 24' 47"} (J2000)
ROLL:            15.847d
IMG_START_DATE:  19407 TJD;   193 DOY;   21/07/12
IMG_START_TIME:  35082.05 SOD {09:44:42.05} UT,   90.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     647775909
X_OFFSET:        947 [pixels]
Y_OFFSET:        602 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1107
Y_GRB_POS:       762
BINNING_INDEX:   1
IM_URL:          sw01059881000msuni0118.fits
SUN_POSTN:       111.94d {+07h 27m 45s}  +21.90d {+21d 54' 18"}
SUN_DIST:         58.94 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      141.88d {+09h 27m 32s}  +20.00d {+20d 00' 06"}
MOON_DIST:        69.56 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      243.54,-19.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      101.52,-58.56 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Jul 21 09:57:42 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1059881,   Seg_Num: 0
POINT_RA:         97.345d {+06h 29m 23s} (J2000)
POINT_DEC:       -35.415d {-35d 24' 54"} (J2000)
ROLL:            15.845d
IMG_START_DATE:  19407 TJD;   193 DOY;   21/07/12
IMG_START_TIME:  35295.33 SOD {09:48:15.33} UT,   303.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     647776122
X_OFFSET:        947 [pixels]
Y_OFFSET:        602 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1107
Y_GRB_POS:       762
BINNING_INDEX:   1
IM_URL:          sw01059881000msuni0331.fits
SUN_POSTN:       111.94d {+07h 27m 46s}  +21.90d {+21d 54' 15"}
SUN_DIST:         58.94 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      141.96d {+09h 27m 51s}  +19.98d {+19d 58' 51"}
MOON_DIST:        69.59 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      243.55,-19.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      101.52,-58.56 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Jul 21 09:48:22 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1059881,   Seg_Num: 0
POINT_RA:         97.344d {+06h 29m 22s} (J2000)
POINT_DEC:       -35.413d {-35d 24' 47"} (J2000)
POINT_ROLL:      15.847d
IMG_START_DATE:  19407 TJD;   193 DOY;   21/07/12
IMG_START_TIME:  35082.05 SOD {09:44:42.05} UT,   90.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.202
N_STARS:         104
X_OFFSET:        560 [pixels]
Y_OFFSET:        400 [pixels]
X_MAX:           1519 [pixels]
Y_MAX:           1359 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    10
SL_URL:          sw01059881000msufc0090.fits
SUN_POSTN:       111.93d {+07h 27m 44s}  +21.90d {+21d 54' 18"}
SUN_DIST:         58.94 [deg]   Sun_angle= 1.0 [hr] (West of Sun)
MOON_POSTN:      141.88d {+09h 27m 30s}  +20.00d {+20d 00' 14"}
MOON_DIST:        69.56 [deg]
MOON_ILLUM:      6 [%]
GAL_COORDS:      243.54,-19.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      101.52,-58.56 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #30453
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 1702 s of XRT Photon Counting mode data and 4 UVOT images for GRB 210712A, 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 = 97.33177, -35.37165 which is equivalent to:
```
RA (J2000): 06h 29m 19.63s
Dec (J2000): -35d 22' 18.0"
```
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 #30455
Y.-D. Hu, E. Fernandez-Garcia, T.-R. Sun, A. J. Castro-Tirado, M. D. Caballero-Garcia, M. A. Castro Tirado (IAA-CSIC), I. Carrasco and C. Perez del Pulgar (Univ. de Malaga), and R. Querel (NIWA), on behalf of a larger collaboration, report:
The 60cm BOOTES-3/YA robotic telescope at NIWA Lauder in Otago (New Zealand) automatically responded to the Swift trigger of GRB 210712A (Sbarufatti et al. GCNC 30447). Images were taken starting at 15:01 UT, but due to poor weather conditions, only images taken after 17:32 UT (~7.8 hrs after trigger) could be used. In the co-added image (30 exposures 60s each), no source is found at the position reported by Swift/XRT (Evans et al. GCNC 30453) down to 19.6 mag which is consistent with the non-detection by Swift/UVOT (Sbarufatti et al. GCNC 30447). Further observations are ongoing.
We thank the staff at NIWA for its excellent support.
GCN Circular #30456
M. H. Siegel (PSU) and B. Sbarufatti (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 210712A 91 s after the BAT trigger (Sbarufatti et al., GCN Circ. 30447). No optical afterglow consistent with the enhanced XRT position (Evans et al. GCN Circ. 30453) 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            91          241          147         >19.5
u_FC               304          554          246         >19.6
white               91          604          167         >19.5
b                  560          579           19         >18.0
u                  304          554          246         >19.6
w2                 609          614            4         >17.5
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.076 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #30457
D.N. Burrows (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , J. D. Gropp (PSU), J.A. Kennea (PSU) and B. Sbarufatti report on behalf of the Swift-XRT team:
We have analysed 8.5 ks of XRT data for GRB 210712A (Sbarufatti et al. GCN Circ. 30447), from 86 s to 44.8 ks after the BAT trigger. The data comprise 164 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN Circ. 30453).
The late-time light curve (from T0+5.4 ks) can be modelled with a power-law decay with a decay index of alpha=1.06 (+0.10, -0.09).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.52 (+/-0.06). The best-fitting absorption column is 1.10 (+0.22, -0.21) x 10^21 cm^-2, consistent with the Galactic value of 8.9 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.98 (+0.13, -0.09) and a best-fitting absorption column consistent with the Galactic value. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.3 x 10^-11 (4.0 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     8.9 (+2.9, -0.0) x 10^20 cm^-2
Galactic foreground: 8.9 x 10^20 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.98 (+0.13, -0.09)
```
If the light curve continues to decay with a power-law decay index of 1.06, 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 4.9 x 10^-13 (5.9 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/01059881.
This circular is an official product of the Swift-XRT team.
GCN Circular #30460
T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), B. Sbarufatti (PSU), M. Stamatikos (OSU), (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 210712A (trigger #1059881) (Sbarufatti, et al., GCN Circ. 30447). The BAT ground-calculated position is RA, Dec = 97.322, -35.376 deg which is
```
  RA(J2000)  =  06h 29m 17.3s 
  Dec(J2000) = -35d 22' 32.2" 
```
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 71%.
The mask-weighted light curve shows a series of peaks. The first is from roughly T-40 to T-30. Then the strongest peak is from T-5 to T+15. This is followed by a string of weaker peaks from T+20 to T+120. The spacecraft slewed away from the burst location by T+700 sec. T90 (15-350 keV) is 136.41 +- 63.58 sec (estimated error including systematics).
The time-averaged spectrum from -39.76 to 174.18 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.00 +- 0.53, and Epeak of 51.8 +- 11.6 keV (chi squared 70.95 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 3.0 +- 0.3 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+0.09 sec in the 15-150 keV band is 2.3 +- 0.3 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.85 +- 0.11 (chi squared 80.11 for 57 d.o.f.). 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/1059881/BA/
GCN Circular #30643
E. Bissaldi (Politecnico and INFN Bari) reports on behalf of the Fermi GBM Team:
"At 09:43:10.98 UT on 12 July 2021, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 210712A (trigger 647775795 / 210712405), which was also detected by the Swift/BAT (Sbarufatti et al. 2021, GCN 30447). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 36 degrees.
The GBM light curve consists of an emission episode with a duration (T90) of about 8 s (50-300 keV). The time-averaged spectrum from T0-0.3 s to T0+6.6 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -1.04 +/- 0.13 and the cutoff energy, parameterized as Epeak, is 230 +/- 50 keV.
The event fluence (10-1000 keV) in this time interval is (1.51 +/- 0.17)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+1.1 s in the 10-1000 keV band is 3.1 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"

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Jochen Greiner, last update: 13-Aug-2021 [Disclaimer]