Gamma-ray Burst 210802A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 02 Aug 21 20:08:10 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     649627691
GRB_RA:          225.683d {+15h 02m 44s} (J2000),
                 225.906d {+15h 03m 37s} (current),
                 225.168d {+15h 00m 40s} (1950)
GRB_DEC:         +32.100d {+32d 06' 00"} (J2000),
                 +32.016d {+32d 00' 58"} (current),
                 +32.295d {+32d 17' 43"} (1950)
GRB_ERROR:       5.83 [deg radius, statistical plus systematic]
GRB_INTEN:       458 [cnts/sec]
DATA_SIGNIF:     20.90 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        19428 TJD;   214 DOY;   21/08/02
GRB_TIME:        72486.49 SOD {20:08:06.49} UT
GRB_PHI:          85.00 [deg]
GRB_THETA:        50.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.54
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       1,1,1, 0,1,0, 0,0,0, 0,1,0, 0,0,
SUN_POSTN:       133.20d {+08h 52m 48s}  +17.54d {+17d 32' 13"}
SUN_DIST:         83.02 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:       63.76d {+04h 15m 03s}  +20.90d {+20d 53' 58"}
MOON_DIST:       124.39 [deg]
MOON_ILLUM:      29 [%]
GAL_COORDS:       50.83, 61.15 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      210.22, 46.77 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210802839/quicklook/glg_lc_medres34_bn210802839.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 18.37,25.50 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 02 Aug 21 20:08:20 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      59
TRIGGER_NUM:     649627691
GRB_RA:          228.300d {+15h 13m 12s} (J2000),
                 228.509d {+15h 14m 02s} (current),
                 227.815d {+15h 11m 16s} (1950)
GRB_DEC:         +36.817d {+36d 49' 00"} (J2000),
                 +36.737d {+36d 44' 13"} (current),
                 +37.003d {+37d 00' 10"} (1950)
GRB_ERROR:       4.37 [deg radius, statistical plus systematic]
GRB_INTEN:       904 [cnts/sec]
DATA_SIGNIF:     60.10 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        19428 TJD;   214 DOY;   21/08/02
GRB_TIME:        72486.49 SOD {20:08:06.49} UT
GRB_PHI:          86.00 [deg]
GRB_THETA:        45.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.44
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       1,1,1, 0,1,0, 0,0,0, 0,1,0, 0,0,
SUN_POSTN:       133.20d {+08h 52m 48s}  +17.54d {+17d 32' 13"}
SUN_DIST:         83.71 [deg]   Sun_angle= -6.4 [hr] (East of Sun)
MOON_POSTN:       63.77d {+04h 15m 04s}  +20.90d {+20d 53' 59"}
MOON_DIST:       120.59 [deg]
MOON_ILLUM:      29 [%]
GAL_COORDS:       59.87, 58.62 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      210.21, 51.96 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210802839/quicklook/glg_lc_medres34_bn210802839.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 18.37,25.50 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 02 Aug 21 20:08:25 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     649627691
GRB_RA:          233.280d {+15h 33m 07s} (J2000),
                 233.495d {+15h 33m 59s} (current),
                 232.782d {+15h 31m 08s} (1950)
GRB_DEC:         +32.570d {+32d 34' 12"} (J2000),
                 +32.498d {+32d 29' 54"} (current),
                 +32.737d {+32d 44' 15"} (1950)
GRB_ERROR:       2.06 [deg radius, statistical only]
DATA_SIGNIF:     58.00 [sigma]
DATA_INTERVAL:   1.024 [sec]
GRB_DATE:        19428 TJD;   214 DOY;   21/08/02
GRB_TIME:        72486.49 SOD {20:08:06.49} UT
GRB_PHI:          93.00 [deg]
GRB_THETA:        48.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       133.20d {+08h 52m 48s}  +17.54d {+17d 32' 13"}
SUN_DIST:         88.96 [deg]   Sun_angle= -6.7 [hr] (East of Sun)
MOON_POSTN:       63.77d {+04h 15m 04s}  +20.90d {+20d 53' 60"}
MOON_DIST:       125.71 [deg]
MOON_ILLUM:      29 [%]
GAL_COORDS:       51.78, 54.73 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      218.83, 49.69 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210802839/quicklook/glg_lc_medres34_bn210802839.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_649627691.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        Bright hard burst in the GBM.  
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.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 02 Aug 21 20:09:02 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      2
TRIGGER_NUM:     649627691
GRB_RA:          230.360d {+15h 21m 26s} (J2000),
                 230.578d {+15h 22m 19s} (current),
                 229.854d {+15h 19m 25s} (1950)
GRB_DEC:         +32.120d {+32d 07' 12"} (J2000),
                 +32.044d {+32d 02' 37"} (current),
                 +32.299d {+32d 17' 55"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
DATA_SIGNIF:     52.00 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        19428 TJD;   214 DOY;   21/08/02
GRB_TIME:        72486.49 SOD {20:08:06.49} UT
GRB_PHI:          90.00 [deg]
GRB_THETA:        49.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       133.20d {+08h 52m 48s}  +17.54d {+17d 32' 12"}
SUN_DIST:         86.79 [deg]   Sun_angle= -6.5 [hr] (East of Sun)
MOON_POSTN:       63.77d {+04h 15m 05s}  +20.90d {+20d 54' 04"}
MOON_DIST:       125.57 [deg]
MOON_ILLUM:      29 [%]
GAL_COORDS:       50.86, 57.19 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      215.60, 48.35 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210802839/quicklook/glg_lc_medres34_bn210802839.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_649627691.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.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 02 Aug 21 20:17:15 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     649627691
GRB_RA:          229.890d {+15h 19m 34s} (J2000),
                 230.113d {+15h 20m 27s} (current),
                 229.374d {+15h 17m 30s} (1950)
GRB_DEC:         +30.270d {+30d 16' 12"} (J2000),
                 +30.193d {+30d 11' 34"} (current),
                 +30.450d {+30d 27' 01"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
GRB_DATE:        19428 TJD;   214 DOY;   21/08/02
GRB_TIME:        72486.49 SOD {20:08:06.49} UT
GRB_PHI:          90.00 [deg]
GRB_THETA:        51.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       133.21d {+08h 52m 49s}  +17.54d {+17d 32' 07"}
SUN_DIST:         87.00 [deg]   Sun_angle= -6.5 [hr] (East of Sun)
MOON_POSTN:       63.84d {+04h 15m 22s}  +20.92d {+20d 55' 08"}
MOON_DIST:       127.21 [deg]
MOON_ILLUM:      29 [%]
GAL_COORDS:       47.40, 57.51 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      216.08, 46.49 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210802839/quicklook/glg_lc_medres34_bn210802839.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210802839/quicklook/glg_locplot_all_bn210802839.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 INTEGRAL_SPIACS event (trignum=9328).

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Mon 02 Aug 21 20:09:04 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    9328,   Sub_Num: 0
GRB_INTEN:      9.23 [sigma]
GRB_TIME:       72485.62 SOD {20:08:05.62} UT
GRB_DATE:       19428 TJD;   214 DOY;   21/08/02
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.  
COMMENTS:       Time_Scale=0.8000 and Time_Error=0.4000.  
COMMENTS:          
COMMENTS:       NOTE: This SPIACS event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=649627691).  
COMMENTS:          
COMMENTS:       The SPIACS lightcurve can be found at:  
COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2021-08/2021-08-02T20-08-05.4499-11513-48016-0.lc

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 02 Aug 21 23:25:53 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     649627691
GRB_RA:          225.683d {+15h 02m 44s} (J2000),
                 225.906d {+15h 03m 37s} (current),
                 225.168d {+15h 00m 40s} (1950)
GRB_DEC:         +32.100d {+32d 06' 00"} (J2000),
                 +32.016d {+32d 00' 58"} (current),
                 +32.295d {+32d 17' 43"} (1950)
GRB_ERROR:       5.83 [deg radius, statistical plus systematic]
GRB_INTEN:       458 [cnts/sec]
DATA_SIGNIF:     20.90 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        19428 TJD;   214 DOY;   21/08/02
GRB_TIME:        72486.49 SOD {20:08:06.49} UT
GRB_PHI:          85.00 [deg]
GRB_THETA:        50.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.54
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       1,1,1, 0,1,0, 0,0,0, 0,1,0, 0,0,
SUN_POSTN:       133.33d {+08h 53m 20s}  +17.50d {+17d 30' 04"}
SUN_DIST:         82.93 [deg]   Sun_angle= -6.2 [hr] (East of Sun)
MOON_POSTN:       65.45d {+04h 21m 48s}  +21.32d {+21d 18' 56"}
MOON_DIST:       123.48 [deg]
MOON_ILLUM:      28 [%]
GAL_COORDS:       50.83, 61.15 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      210.22, 46.77 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210802839/quicklook/glg_lc_medres34_bn210802839.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 18.37,25.50 [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 INTEGRAL_SPIACS event (trignum=9328).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 02 Aug 21 23:25:56 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      59
TRIGGER_NUM:     649627691
GRB_RA:          228.300d {+15h 13m 12s} (J2000),
                 228.509d {+15h 14m 02s} (current),
                 227.815d {+15h 11m 16s} (1950)
GRB_DEC:         +36.817d {+36d 49' 00"} (J2000),
                 +36.737d {+36d 44' 13"} (current),
                 +37.003d {+37d 00' 10"} (1950)
GRB_ERROR:       4.37 [deg radius, statistical plus systematic]
GRB_INTEN:       904 [cnts/sec]
DATA_SIGNIF:     60.10 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        19428 TJD;   214 DOY;   21/08/02
GRB_TIME:        72486.49 SOD {20:08:06.49} UT
GRB_PHI:          86.00 [deg]
GRB_THETA:        45.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.44
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       1,1,1, 0,1,0, 0,0,0, 0,1,0, 0,0,
SUN_POSTN:       133.33d {+08h 53m 20s}  +17.50d {+17d 30' 04"}
SUN_DIST:         83.63 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:       65.45d {+04h 21m 48s}  +21.32d {+21d 18' 57"}
MOON_DIST:       119.79 [deg]
MOON_ILLUM:      28 [%]
GAL_COORDS:       59.87, 58.62 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      210.21, 51.96 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210802839/quicklook/glg_lc_medres34_bn210802839.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 18.37,25.50 [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 INTEGRAL_SPIACS event (trignum=9328).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 03 Aug 21 00:17:37 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     649627691
GRB_RA:          229.920d {+15h 19m 41s} (J2000),
                 230.143d {+15h 20m 34s} (current),
                 229.404d {+15h 17m 37s} (1950)
GRB_DEC:         +30.300d {+30d 18' 00"} (J2000),
                 +30.223d {+30d 13' 22"} (current),
                 +30.480d {+30d 28' 49"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
GRB_DATE:        19428 TJD;   214 DOY;   21/08/02
GRB_TIME:        72486.49 SOD {20:08:06.49} UT
GRB_PHI:          90.16 [deg]
GRB_THETA:        50.80 [deg]
E_RANGE:         50.000 - 300.000 [keV]
LOC_ALGORITHM:   415 (Gnd S/W Version number)
SUN_POSTN:       133.37d {+08h 53m 28s}  +17.49d {+17d 29' 30"}
SUN_DIST:         86.90 [deg]   Sun_angle= -6.5 [hr] (East of Sun)
MOON_POSTN:       65.89d {+04h 23m 34s}  +21.42d {+21d 25' 18"}
MOON_DIST:       126.18 [deg]
MOON_ILLUM:      28 [%]
GAL_COORDS:       47.46, 57.48 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      216.10, 46.53 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210802839/quicklook/glg_lc_medres34_bn210802839.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210802839/quicklook/glg_locplot_all_bn210802839.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 has human-in-the-loop processing.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=9328).

GCN Circular #30586
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-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) started inspect of the Fermi GRB210802.84 (trigger No 649627691,15h 21m 26.40s , +32d 07m 12.0s, R=1) errorbox 44 sec after notice time and 56 sec after trigger time at 2021-08-02 20:09:03 UT, with upper limit up to 17.7 mag. The observations began at zenith distance = 75 deg. The sun altitude is -52.1 deg.
MASTER-Tavrida robotic telescope located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB210802.84 errorbox 99 sec after notice time and 111 sec after trigger time at 2021-08-02 20:09:58 UT, with upper limit up to 18.2 mag. The observations began at zenith distance = 44 deg. The sun altitude is -24.3 deg.
The galactic latitude b = 57 deg., longitude l = 51 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1678958
We obtain a following upper limits.
```
Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

      62 | 2021-08-02 20:09:03 |         MASTER-SAAO | (15h 32m 49.34s , +32d 39m 18.2s) |   C |    10 | 17.1 |        
      96 | 2021-08-02 20:09:32 |         MASTER-SAAO | (15h 32m 55.22s , +32d 38m 20.3s) |   C |    20 | 17.7 |        
     122 | 2021-08-02 20:09:58 |      MASTER-Tavrida | (15h 34m 32.89s , +32d 26m 04.8s) |   C |    20 | 18.2 |        
     135 | 2021-08-02 20:10:11 |         MASTER-SAAO | (15h 21m 09.74s , +32d 11m 08.8s) | P\  |    20 | 15.8 |        
     166 | 2021-08-02 20:10:37 |      MASTER-Tavrida | (15h 22m 58.48s , +31d 57m 51.2s) |  P\ |    30 | 16.0 |        
     180 | 2021-08-02 20:10:51 |         MASTER-SAAO | (15h 21m 16.80s , +32d 11m 21.8s) | P\  |    30 | 15.8 |        
     220 | 2021-08-02 20:11:26 |      MASTER-Tavrida | (15h 22m 51.94s , +31d 56m 46.2s) |  P\ |    40 | 16.0 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 03 Aug 21 06:33:02 UT
NOTICE_TYPE:     Fermi-LAT Offline Position
TRIGGER_NUM:     210802839
GRB_RA:          230.900d {+15h 23m 36s} (J2000),
                 231.123d {+15h 24m 30s} (current),
                 230.383d {+15h 21m 32s} (1950)
GRB_DEC:         +29.846d {+29d 50' 46"} (J2000),
                 +29.770d {+29d 46' 13"} (current),
                 +30.023d {+30d 01' 21"} (1950)
GRB_ERROR:       21.11 [arcmin radius, 90% containment, statistical only]
GRB_DATE:        19428 TJD;   214 DOY;   21/08/02
GRB_TIME:        72486.00 SOD {20:08:06.00} UT
TRIGGER_ID:      0x20000000
MISC:            0x40000000
SUN_POSTN:       133.62d {+08h 54m 28s}  +17.42d {+17d 25' 24"}
SUN_DIST:         87.68 [deg]   Sun_angle= -6.5 [hr] (East of Sun)
MOON_POSTN:       69.12d {+04h 36m 30s}  +22.16d {+22d 09' 28"}
MOON_DIST:       125.26 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:       46.75, 56.60 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      217.49, 46.42 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi LAT Offline position.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        It is the result of human-in-the-loop processing.  
COMMENTS:        This is a human generated position of a LAT ground detection.  
COMMENTS:        This source corresponds to GBM trigger.

GCN Circular #30587
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a series of observations, tiled on the sky, of the Fermi/LAT GRB 210802A. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/xrt_products/TILED_GRB00100
Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. The probability of finding serendipitous sources, unrelated to the Fermi/LAT event is high: any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration.
Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).
This circular is an official product of the Swift-XRT team.
GCN Circular #30589
F. Longo (University and INFN, Trieste), M. Arimoto (Kanazawa Univ.), E. Bissaldi (Politecnico and INFN, Bari), M. Axelsson (KTH & Stockholm Univ.) and M. Ohno (Hiroshima Univ. & E�tv�s Univ.) report on behalf of the Fermi-LAT Collaboration:
On 2 August 2021, Fermi-LAT detected high-energy emission from GRB 210802A which was also detected by Fermi-GBM (trigger 649627691/210802839). The best LAT on-ground location is found to be
RA, Dec = 230.9, 29.8 (degrees, J2000)
with an error radius of 0.35 deg (90% containment, statistical error only). This was 51 deg from the LAT boresight at the time of the GBM trigger:
T0 = 20:08:06.49 UT.
The data from the Fermi-LAT show a significant increase in the event rate after the GBM trigger that is spatially and temporally correlated with the GBM emission with high significance.
The photon flux above 100 MeV in the time interval 0-1000 s after the GBM trigger is (1.0 +/- 0.3) E-5 ph/cm2/s. The estimated photon index above 100 MeV is -2.3 +/- 0.3. The highest-energy photon is a 1.4 GeV event which is observed 3 seconds after the GBM trigger.
A Swift ToO has been approved for this burst.
The Fermi-LAT point of contact for this burst is Elisabetta Bissaldi (elisabetta.bissaldi@ba.infn.it).
The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.
GCN Circular #30590
O.J. Roberts (USRA/NASA-MSFC) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 20:08:06.49 UT on 02 August 2021, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 210802A (trigger 649627691 / 210802839), which was also detected by Fermi-LAT (F. Longo et al. 2021, GCN 30589). The Fermi GBM on-ground location is consistent with the LAT position.
The angle from the Fermi LAT boresight at the GBM trigger time is 51 degrees.
The GBM light curve consists of multiple bright pulses with a duration (T90) of about 11 s (50-300 keV). The time-averaged spectrum from T0-0.3 s to T0+12.8 s is well fit by a power law function with an exponential high-energy cutoff. The power law index is -0.66 +/- 0.02 and the cutoff energy, parameterized as Epeak, is 372 +/- 12 keV.
The event fluence (10-1000 keV) in this time interval is (2.10 +/- 0.03)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+6.6 s in the 10-1000 keV band is 16.4 +/- 0.3 ph/s/cm^2.
A Band function fits the spectrum equally well with Epeak= 365 +/- 15 keV, alpha = -0.65 +/- 0.03 and beta = -3.22 +/- 0.75.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
GCN Circular #30591
B. Sbarufatti (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , D.N. Burrows (PSU), J. D. Gropp (PSU) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:
Swift-XRT has performed follow-up observations of the Fermi/LAT-detected burst GRB 210802A (Longo et al. GCN Circ. 30589) in a series of observations tiled on the sky. The total exposure time is 5.2 ks, distributed over 4 tiles; the maximum exposure at a single sky location was 2.3 ks. The data were collected between T0+41.7 ks and T0+43.0 ks, and are entirely in Photon Counting (PC) mode.
Twenty-eight uncatalogued X-ray sources are detected. Many of these sources are in the bottom tile (likely a high background effect), and in the left tile (possibly an extended emission related to a nearby cluster of galaxies). One of the most significant sources ("Source 7") is above the 2SXPS 3-sigma upper limit at this position, and is therefore likely the GRB afterglow. Using 1246 s of PC mode data and 1 UVOT image, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 230.72285, +29.90180 which is equivalent to:
```
RA (J2000): 15h 22m 53.48s
Dec(J2000): +29d 54' 06.5"
```
with an uncertainty of 3.5 arcsec (radius, 90% confidence). This position is 9.8 arcmin from the Fermi/LAT position. While we cannot determine at the present time whether the source is fading, we note that a previous 1 ks Swift-XRT visit of the field showed no sign of Source 7 (https://www.swift.ac.uk/2SXPS/Fields/10000004351).
The results of the XRT-team automatic analysis of the likely afterglow are at https://www.swift.ac.uk/xrt_products/TILED_GRB00100/Source7.php.
The results of the full analysis of the tiled XRT observations are available at https://www.swift.ac.uk/xrt_products/TILED_GRB00100.
This circular is an official product of the Swift-XRT team.
GCN Circular #30592
Y.-D. Hu, T.-R. Sun, E. Fernandez-Garcia, A. J. Castro-Tirado, M.D. Caballero-Garcia (IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco (Univ. de Malaga), R. Fernandez-Munoz (IHSM/UMA-CSIC) and M. Jelinek (ASU-CAS), on behalf of a larger collaboration, report:
Following the Fermi trigger of GRB 210802A (Longo GCNC 30589, Roberts et al. GCNC 30590), we triggered the 60cm BOOTES-2/TELMA robotic telescope at IHSM La Mayora (UMA-CSIC) in Algarrobo Costa (Malaga, Spain) after the twilight as soon as it was possible. Useful images were taken only after 20:12 UT on 03 Aug (~1 day after trigger). In the co-added 12 x 60 s exposure image (clear filter), no optical afterglow is detected within the X-ary afterglow position reported by XRT/Swift (Sbarufatti et al. GCNC 30591) down to 20.3 mag.
We thank the staff at La Mayora for its excellent support.
GCN Circular #30593
Alan M. Watson (UNAM), Nat Butler (ASU), Eleonora Troja (GSFC/UMD), Rosa L. Becerra (UNAM), Simone Dichiara (GSFC/UMD), Alexander Kutyrev (GSFC/UMD), William H. Lee (UNAM), Diego Gonzalez (UNAM), Oc�lotl Lopez (UNAM), Margarita Pereyra (UNAM), and Srihari Ravi (ASU) report:
We observed the field of the Fermi GBM/LAT event GRB 210802A (Longo et al., GCN Circ., 30589; Roberts et al., GCN Circ., 30590) with the DDOTI wide-field imager at the Observatorio Astron�mico Nacional on Sierra San Pedro Martir ( http://ddoti.astroscu.unam.mx) from 2021-08-03 03:35 to 07:37 UTC (7.45 to 11.48 hours after the trigger).
We observed a region of about 14 degrees in RA by 10 degrees in declination, with a 1 x 2 grid of pointings centered on the Fermi GBM Final Position 15:19:40.80 +30:18:00.0 (J2000) and including the entire LAT uncertainty region (Longo et al., GCN Circ., 30589). We obtained about 105 minutes exposure on the LAT uncertainty region. We obtained AB photometry by calibration against the APASS catalog.
Comparing to the Pan-STARRS DR1 catalog, we detect no uncatalogued point sources in the LAT uncertainty region to a 10-sigma limiting magnitude of w = 21.0.
At the position of the candidate X-ray afterglow (Sbarufatti et al., GCN Circ., 30591), we detect no point source to a 5-sigma limiting magnitude of w = 21.8.
We thank the staff of the Observatorio Astron�mico Nacional in San Pedro M�rtir.
GCN Circular #30596
R. Hosokawa, N. Ito, Y. Imai, K. L. Murata, M. Niwano, H. Takamatsu, R. Noto, S. Sato, M. Takaku, R. Yamaguchi, Y. Yatsu, and N. Kawai (TokyoTech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 210802A (V. Lipunov et al. GCN Circular #30586, P. A. Evans et al. GCN Circular #30587, F. Longo et al. GCN Circular #30589, O.J. Roberts et al. GCN Circular #30590, B. Sbarufatti et al. GCN Circular #30591, Y.-D. Hu et al. GCN Circular #30592, Alan M. Watson et al. GCN Circular #30593) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope Okayama. The observation with a series of 60 sec exposures started at 2021-08-03 10:34:24 UT (14.4 hours after Fermi trigger). We stacked the images with good conditions. We did not detect any uncatalogued sources within the XRT error region (B. Sbarufatti et al. GCN Circular #30591). We obtained the 5-sigma limits of the stacked images as follows.
```
T0+[hour] MID-UT T-EXP[sec] 5-sigma limits
------------------------------------------------------------------------------------------------
15.8 2021-08-03 11:54:24 1080 Rc>17.2, Ic>16.9
------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
```
We used PS1 catalog for flux calibration. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al. 2021, PASJ, Vol.73, Issue 1, Pages 4-24; https://github.com/MNiwano/Eclaire).
GCN Circular #30622
V. D'Elia (ASI-SSDC & INAF-OAR) and S.B. Cenko (GSFC) report on behalf of the Swift-XRT team:
Swift-XRT has performed further follow-up observations of the Fermi burst (Longo et al., GCN Circ. 30589; Roberts et al., GCN Circ. 30590).
The possible afterglow reported in Sbarufatti et al. (GCN Circ. 30591, "source 7") is no longer detected in a 4 ks observation, down to a three sigma upper limit of 4.8E-3 cts/s (corresponding to 1.28E-13 erg/cm^2/s) at the position of the transient. This value is significantly below the previously reported flux value for the candidate, thus confirming “source 7” as the afterglow of GRB 210802A.
The results of the full analysis of the XRT observations are available at https://www.swift.ac.uk/xrt_curves/00021456/.
This circular is an official product of the Swift-XRT team.

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Jochen Greiner, last update: 09-Aug-2021 [Disclaimer]