Gamma-ray Burst 200716A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 16 Jul 20 01:27:02 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      48
TRIGGER_NUM:     616555602
GRB_RA:          131.250d {+08h 45m 00s} (J2000),
                 131.467d {+08h 45m 52s} (current),
                 130.722d {+08h 42m 53s} (1950)
GRB_DEC:         -28.267d {-28d 16' 00"} (J2000),
                 -28.342d {-28d 20' 31"} (current),
                 -28.084d {-28d 05' 02"} (1950)
GRB_ERROR:       15.75 [deg radius, statistical plus systematic]
GRB_INTEN:       212 [cnts/sec]
DATA_SIGNIF:     10.30 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        19046 TJD;   198 DOY;   20/07/16
GRB_TIME:        5197.76 SOD {01:26:37.76} UT
GRB_PHI:         306.00 [deg]
GRB_THETA:        70.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.66
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,0, 1,1,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       115.88d {+07h 43m 31s}  +21.31d {+21d 18' 24"}
SUN_DIST:         51.88 [deg]   Sun_angle= -1.0 [hr] (East of Sun)
MOON_POSTN:       56.35d {+03h 45m 23s}  +17.02d {+17d 01' 25"}
MOON_DIST:        85.58 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      251.26,  9.02 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      144.18,-44.26 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200716060/quicklook/glg_lc_medres34_bn200716060.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 110.57,8.67 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 16 Jul 20 01:27:11 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      59
TRIGGER_NUM:     616555602
GRB_RA:          131.483d {+08h 45m 56s} (J2000),
                 131.700d {+08h 46m 48s} (current),
                 130.955d {+08h 43m 49s} (1950)
GRB_DEC:         -28.217d {-28d 13' 00"} (J2000),
                 -28.293d {-28d 17' 32"} (current),
                 -28.033d {-28d 01' 59"} (1950)
GRB_ERROR:       7.28 [deg radius, statistical plus systematic]
GRB_INTEN:       266 [cnts/sec]
DATA_SIGNIF:     26.50 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        19046 TJD;   198 DOY;   20/07/16
GRB_TIME:        5197.76 SOD {01:26:37.76} UT
GRB_PHI:         306.00 [deg]
GRB_THETA:        70.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.82
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       0,0,0, 1,1,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       115.88d {+07h 43m 31s}  +21.31d {+21d 18' 24"}
SUN_DIST:         51.90 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:       56.35d {+03h 45m 23s}  +17.02d {+17d 01' 26"}
MOON_DIST:        85.75 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      251.34,  9.21 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      144.42,-44.14 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200716060/quicklook/glg_lc_medres34_bn200716060.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 110.57,8.67 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 16 Jul 20 01:27:21 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     616555602
GRB_RA:          135.130d {+09h 00m 31s} (J2000),
                 135.370d {+09h 01m 29s} (current),
                 134.546d {+08h 58m 11s} (1950)
GRB_DEC:         -16.060d {-16d 03' 35"} (J2000),
                 -16.141d {-16d 08' 27"} (current),
                 -15.864d {-15d 51' 48"} (1950)
GRB_ERROR:       3.13 [deg radius, statistical only]
DATA_SIGNIF:     25.40 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        19046 TJD;   198 DOY;   20/07/16
GRB_TIME:        5197.76 SOD {01:26:37.76} UT
GRB_PHI:         317.00 [deg]
GRB_THETA:        77.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       115.88d {+07h 43m 31s}  +21.31d {+21d 18' 24"}
SUN_DIST:         42.05 [deg]   Sun_angle= -1.3 [hr] (East of Sun)
MOON_POSTN:       56.35d {+03h 45m 24s}  +17.02d {+17d 01' 28"}
MOON_DIST:        84.63 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      243.51, 19.30 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      143.07,-31.57 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200716060/quicklook/glg_lc_medres34_bn200716060.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_616555602.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
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:     Thu 16 Jul 20 01:27:34 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      88
TRIGGER_NUM:     616555602
GRB_RA:          132.800d {+08h 51m 12s} (J2000),
                 133.019d {+08h 52m 05s} (current),
                 132.268d {+08h 49m 04s} (1950)
GRB_DEC:         -27.867d {-27d 52' 00"} (J2000),
                 -27.945d {-27d 56' 39"} (current),
                 -27.678d {-27d 40' 42"} (1950)
GRB_ERROR:       3.98 [deg radius, statistical plus systematic]
GRB_INTEN:       1433 [cnts/sec]
DATA_SIGNIF:     50.20 [sigma]
INTEG_TIME:      0.512 [sec]
GRB_DATE:        19046 TJD;   198 DOY;   20/07/16
GRB_TIME:        5197.76 SOD {01:26:37.76} UT
GRB_PHI:         306.00 [deg]
GRB_THETA:        70.00 [deg]
DATA_TIME_SCALE: 0.5120 [sec]
HARD_RATIO:      0.44
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,0, 1,1,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       115.88d {+07h 43m 31s}  +21.31d {+21d 18' 24"}
SUN_DIST:         51.96 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
MOON_POSTN:       56.35d {+03h 45m 24s}  +17.02d {+17d 01' 30"}
MOON_DIST:        86.70 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      251.79, 10.34 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      145.74,-43.38 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200716060/quicklook/glg_lc_medres34_bn200716060.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 110.57,8.67 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 16 Jul 20 01:27:41 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      92
TRIGGER_NUM:     616555602
GRB_RA:          133.000d {+08h 52m 00s} (J2000),
                 133.219d {+08h 52m 53s} (current),
                 132.467d {+08h 49m 52s} (1950)
GRB_DEC:         -27.817d {-27d 49' 00"} (J2000),
                 -27.895d {-27d 53' 40"} (current),
                 -27.628d {-27d 37' 39"} (1950)
GRB_ERROR:       3.93 [deg radius, statistical plus systematic]
GRB_INTEN:       1512 [cnts/sec]
DATA_SIGNIF:     144.70 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        19046 TJD;   198 DOY;   20/07/16
GRB_TIME:        5197.76 SOD {01:26:37.76} UT
GRB_PHI:         306.00 [deg]
GRB_THETA:        70.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.56
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,0, 1,1,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       115.88d {+07h 43m 31s}  +21.31d {+21d 18' 24"}
SUN_DIST:         51.98 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:       56.35d {+03h 45m 24s}  +17.03d {+17d 01' 31"}
MOON_DIST:        86.85 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      251.86, 10.51 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      145.94,-43.27 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200716060/quicklook/glg_lc_medres34_bn200716060.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 110.57,8.67 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 16 Jul 20 01:28:08 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      1
TRIGGER_NUM:     616555602
GRB_RA:          144.050d {+09h 36m 12s} (J2000),
                 144.297d {+09h 37m 11s} (current),
                 143.450d {+09h 33m 48s} (1950)
GRB_DEC:         -13.840d {-13d 50' 23"} (J2000),
                 -13.933d {-13d 55' 57"} (current),
                 -13.615d {-13d 36' 55"} (1950)
GRB_ERROR:       1.82 [deg radius, statistical only]
DATA_SIGNIF:     26.60 [sigma]
DATA_INTERVAL:   8.192 [sec]
GRB_DATE:        19046 TJD;   198 DOY;   20/07/16
GRB_TIME:        5197.76 SOD {01:26:37.76} UT
GRB_PHI:         316.00 [deg]
GRB_THETA:        86.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       115.88d {+07h 43m 31s}  +21.31d {+21d 18' 23"}
SUN_DIST:         44.95 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:       56.36d {+03h 45m 25s}  +17.03d {+17d 01' 35"}
MOON_DIST:        92.13 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      247.55, 27.39 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      151.44,-26.50 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200716060/quicklook/glg_lc_medres34_bn200716060.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_616555602.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
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:     Thu 16 Jul 20 01:28:43 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      3
TRIGGER_NUM:     616555602
GRB_RA:          144.640d {+09h 38m 34s} (J2000),
                 144.886d {+09h 39m 33s} (current),
                 144.041d {+09h 36m 10s} (1950)
GRB_DEC:         -14.600d {-14d 35' 59"} (J2000),
                 -14.693d {-14d 41' 35"} (current),
                 -14.374d {-14d 22' 25"} (1950)
GRB_ERROR:       1.41 [deg radius, statistical only]
DATA_SIGNIF:     28.40 [sigma]
DATA_INTERVAL:   19.456 [sec]
GRB_DATE:        19046 TJD;   198 DOY;   20/07/16
GRB_TIME:        5197.76 SOD {01:26:37.76} UT
GRB_PHI:         315.00 [deg]
GRB_THETA:        86.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       115.88d {+07h 43m 31s}  +21.31d {+21d 18' 23"}
SUN_DIST:         45.90 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:       56.36d {+03h 45m 26s}  +17.03d {+17d 01' 40"}
MOON_DIST:        92.89 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      248.62, 27.32 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      152.35,-27.00 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200716060/quicklook/glg_lc_medres34_bn200716060.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_616555602.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
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:     Thu 16 Jul 20 01:35:59 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     616555602
GRB_RA:          134.830d {+08h 59m 19s} (J2000),
                 135.071d {+09h 00m 17s} (current),
                 134.242d {+08h 56m 58s} (1950)
GRB_DEC:         -15.020d {-15d 01' 11"} (J2000),
                 -15.101d {-15d 06' 02"} (current),
                 -14.825d {-14d 49' 28"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
GRB_DATE:        19046 TJD;   198 DOY;   20/07/16
GRB_TIME:        5197.76 SOD {01:26:37.76} UT
GRB_PHI:         318.00 [deg]
GRB_THETA:        76.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       115.88d {+07h 43m 32s}  +21.31d {+21d 18' 20"}
SUN_DIST:         40.99 [deg]   Sun_angle= -1.3 [hr] (East of Sun)
MOON_POSTN:       56.42d {+03h 45m 41s}  +17.05d {+17d 02' 46"}
MOON_DIST:        83.96 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:      242.45, 19.69 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      142.35,-30.68 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200716060/quicklook/glg_lc_medres34_bn200716060.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200716060/quicklook/glg_locplot_all_bn200716060.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:        This is likely a Long GRB.

GCN Circular #28109
The Fermi GBM team reports the detection of a likely LONG GRB
At 01:26:37 UT on 16 Jul 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200716A (trigger 616555602.759372 / 200716060).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 134.8, Dec = -15.0 (J2000 degrees, equivalent to J2000 08h 59m, -15d 00'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 76.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200716060/quicklook/glg_skymap_all_bn200716060.png
The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200716060/quicklook/glg_healpix_all_bn200716060.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200716060/quicklook/glg_lc_medres34_bn200716060.gif
GCN Circular #28112
B. Biltzinger, F. Kunzweiler, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger 616555602 at 01:26:37 on 16 July 2020 were automatically fitted for spectrum and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427; Berlato et al. 2019, ApJ 873, 60).
The best-fit position (1 sigma statistical errors) is:
```
RA(2000.0) = 137.4+/-0.6 deg
Decl.(2000.0) = -16.2+/-0.8 deg
```
We estimate an additional systematic error of 1 deg.
Further details are available at: https://grb.mpe.mpg.de/grb/GRB200716060/
The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB200716060/healpix
The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB200716060/json
GCN Circular #28116
A. Ursi (INAF/IAPS), C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), P. Tempesta (TeleSpazio), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), F. Lucarelli (SSDC, and INAF/OAR), A. Argan, M. Cardillo, C. Casentini, Y. Evangelista, G. Piano (INAF/IAPS), A. Bulgarelli, V. Fioretti, F. Fuschino, N. Parmiggiani (INAF/OAS-Bologna), M. Marisaldi (INAF/OAS-Bologna, and Bergen University), F. Longo (Univ. Trieste and INFN Trieste), M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team:
The AGILE satellite detected the long GRB 200716A reported by Fermi-GBM (GCN #28109, trigger 616555602.759372 / 200716060), occurring at T0 = 2020-07-16 01:26:37 s (UTC).
The event is clearly visible in the scientific ratemeters (RMs) of the SuperAGILE (SA, 18-60 keV), MiniCALorimeter (MCAL, 0.4-100 MeV), and Anti-Coincidence (50-200 keV) detectors. Their light curves show a multi-peaked profile, lasting about ~60 s and releasing ~4200 counts in the SA detector (above a background rate of 60 Hz), ~75200 counts in the MCAL detector (above a background rate of 1200 Hz), and ~225000 counts in the AC detector (above a background rate of 3700 Hz). The AGILE RMs light curves can be found at http://www.agilescienceapp.it/notices/GRB200716A_AGILE_RMs.png .
The intense episode occurring at about T0 + 30 s triggered a MCAL high time resolution data acquisition. The time-integrated spectrum of this episode in ~7 s can be fitted in the energy range 0.4-10 MeV with a single power-law with ph.ind. = 1.51 -0.05/+0.05, resulting in a reduced chi-squared of 1.6 (48 d.o.f.). The episode fluence in the same energy range and time interval is 3.5e-05 ergs/cm^2 (90% confidence level).
Additional analysis of AGILE data is in progress.
GCN Circular #28117
S. Gupta, V. Sharma and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (IUCAA/TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data showed the detection of a long GRB 200716A, which was also detected by Fermi GBM (GCN #28109), BALROG (Biltzinge B. et al., GCN #28112) and AGILE (Ursi A. et al., GCN #28116).
The source was clearly detected in the 40-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2020-07-16 01:27:08.646 UT. The measured peak count rate associated with the burst is 641 +/- 30 cts/s above the background in the combined data of four quadrants, with a total of 5950 +/- 52 cts. The local mean background count rate was 480 +/- 1 cts/s. Using cumulative rates, we measure a T90 of 44.029 +/- 0.032 s. In preliminary analysis, we find that 637 Compton events are associated with this event.
It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2020-07-16 01:27:07.277 UT. The measured peak count rate is 641 +/- 30 cts/s above the background in the combined Veto data of four quadrants, with a total of 6218 +/- 72 cts. The local mean background count rate was 1442 +/- 1.4 cts/s. We measure a T90 of 43.651 +/- 0.024 s from the cumulative Veto light curve.
CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project.
GCN Circular #28120
C. Malacaria (NASA-MSFC/USRA), E. Bissaldi (Politecnico and INFN Bari), R. Dunwoody (UCD), J. Mangan (UCD) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 01:26:37.76 UT on 16 July 2020, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 200716A (trigger 616555602 / 200716060) , which also triggered AGILE (Ursi A. et al., GCN #28116) and AstroSat (Gupta et al., GCN #28117).
The Fermi GBM Final Real-time Localization is reported in GCN #28109.
The angle from the Fermi LAT boresight at the GBM trigger time is 76 degrees.
The GBM light curve shows multiple peaks with a duration (T90) of about 45 s (50-300 keV). The time-averaged spectrum from T0-9.5 s to T0+59.1 s is best fit by a Comptonized model with Epeak = 456 +/- 17 keV and alpha = -0.97 +/- 0.01 . The event fluence (10-1000 keV) in this time interval is (5.986 +/- 0.041)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+31 s in the 10-1000 keV band is 24.0 +/- 0.4 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/"
GCN Circular #28121
K. Hurley, on behalf of the IPN,
I. G. Mitrofanov, D. V. Golovin, A. S. Kozyrev, M. L. Litvak, and A. B. Sanin, on behalf of the HEND-Odyssey GRB team,
A. Ridnaia, S. Golenetskii, R. Aptekar, D. Frederiks, D. Svinkin, and T. Cline on behalf of the Konus-Wind team,
A. Goldstein, M. S. Briggs, and C. Wilson-Hodge on behalf of the Fermi GBM team,
A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,
S. Barthelmy, J. Cummings, H. Krimm, and D. Palmer, on behalf of the Swift-BAT team,
and
W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team, report:
The intense long-duration GRB 200716A (Fermi-GBM detection: The Fermi GBM team, GCN Circ. 28109, Malacaria et al., GCN Circ. 28120; BALROG localization: Biltzinger et al., GCN Circ. 28112; AGILE detection: Ursi et al., GCN Circ. 28116; AstroSat CZTI detection: Gupta et al., GCN Circ. 28117) was detected by Fermi (GBM trigger 616555602), Konus-Wind, INTEGRAL (SPI-ACS), Mars-Odyssey (HEND), AGILE, AstoSat (CZTI), and Swift (BAT) at about 5195 s UT (01:26:35). The burst was outside the coded field of view of the BAT.
We have triangulated it to a preliminary, 3 sigma error box whose coordinates are:
```
 ---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
  139.332 (09h 17m 20s) -16.730 (-16d 43' 46")
 Corners:
  138.969 (09h 15m 53s) -16.190 (-16d 11' 23")
  139.223 (09h 16m 54s) -17.334 (-17d 20' 01")
  139.702 (09h 18m 48s) -17.266 (-17d 15' 58")
  139.445 (09h 17m 47s) -16.124 (-16d 07' 25")
 ---------------------------------------------
```
The error box area is 1939 sq. arcmin, and its maximum dimension is 1.3 deg (the minimum one is 28 arcmin). The Sun distance was 44 deg.
This box may be improved.
The localization is consistent with, but reduces the area of, the final Fermi-GBM (GCN Circ. 28109) and BALROG (GCN Circ. 28112) localizations.
A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB200716_T05194/IPN/
The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.
GCN Circular #28134
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),
H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),
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 GRB 200716A ( Fermi GBM team, GCN 28109) errorbox 55482 sec after notice time and 55509 sec after trigger time at 2020-07-16 16:51:47 UT, with upper limit up to 19.0 mag. Observations started at twilight. The observations began at zenith distance = 63 deg. The sun altitude is -12.5 deg.
The galactic latitude b = 9 deg., longitude l = 252 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1402195
We obtain a following upper limits.
```
Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________


   55539 | 2020-07-16 16:51:47 |         MASTER-SAAO | (09h 17m 38.83s , -17d 56m 49.4s) |   C |    60 | 18.4 |        
   55539 | 2020-07-16 16:51:47 |         MASTER-SAAO | (09h 10m 28.60s , -17d 57m 40.1s) |   C |    60 | 18.1 |        
   56058 | 2020-07-16 17:00:25 |         MASTER-SAAO | (09h 17m 34.76s , -17d 54m 58.7s) |   C |    60 | 19.0 |        
   56058 | 2020-07-16 17:00:25 |         MASTER-SAAO | (09h 10m 24.70s , -17d 55m 50.1s) |   C |    60 | 18.6 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #29984
James DeLaunay (PSU), Aaron Tohuvavohu (U Toronto), Jamie A. Kennea (PSU) report:
Swift/BAT did not trigger on GRB 200716A (T0: 2020-07-16 01:26:37.76 UTC), Fermi/GBM team (GCNs 28109, 28120), BALROG (GCN 28112), AGILE (GCN 28116), AstroSat CZTI (GCN 28117), IPN (GCN 28121).
The Fermi/GBM notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).
Upon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.
The burst is detected in BAT with a duration of at least 60 seconds.
This burst was not localized in our low-latency analysis at the time. An updated and improved version of the targeted search pipeline was recently re-run on archival data and this burst was recovered.
With a maximum likelihood analysis (DeLaunay et al. 2021, in prep.) on the event-mode data we detect a location for the burst with a square root of the test statistic, sqrt(TS), of 110.96. The sqrt(TS) behaves similarly to SNR. Using the normal BAT imaging technique, we find the same location for the GRB with an SNR of 8.5.
The partial coding fraction for this burst was 1%. The SNR in the image is significantly lower than the sqrt(TS) as the maximum likelihood analysis is capable of considering counts from the burst deposited on the detector that arrive via lines of sight that do not pass through the coded mask. For the case of bursts at low partial coding fractions, this yields a substantial sensitivity improvement over imaging.
The BAT position is RA, Dec = 139.348, -16.712 deg which is
```
   RA(J2000)  = 09h 17m 23.5s
   Dec(J2000) =  -16d 42′ 43.2″
```
with an estimated uncertainty of 5 arcmin.
This position is consistent with the ~1/2 square degree IPN localization (GCN 28121).
GUANO is a fully autonomous, extremely low latency, spacecraft commanding pipeline designed for targeted recovery of BAT event mode data around the times of compelling astrophysical events to enable more sensitive GRB searches.
A live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/

Back to JG's homepage

Jochen Greiner, last update: 10-May-2021 [Disclaimer]