GRB 200716A
GCN Circular 28109
Subject
GRB 200716A: Fermi GBM Final Real-time Localization
Date
2020-07-16T01:36:55Z (5 years ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
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
Subject
GRB 200716A: BALROG localization (Fermi Trigger 616555602 / GRB 200716060)
Date
2020-07-16T05:50:07Z (5 years ago)
From
Jochen Greiner at MPE,Garching <jcg@mpe.mpg.de>
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
Subject
GRB 200716A: AGILE detection
Date
2020-07-16T12:56:58Z (5 years ago)
From
Alessandro Ursi at INAF/IAPS <alessandro.ursi@gmail.com>
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
Subject
GRB 200716A: AstroSat CZTI detection
Date
2020-07-16T16:53:57Z (5 years ago)
From
Soumya Gupta at IUCAA/ASTROSAT <soumya@iucaa>
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
Subject
GRB 200716A: Fermi GBM detection
Date
2020-07-16T20:57:27Z (5 years ago)
From
Christian Malacaria at NASA-MSFC/USRA <cmalacaria@usra.edu>
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
Subject
IPN triangulation of GRB 200716A
Date
2020-07-16T21:32:56Z (5 years ago)
From
Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>
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
Subject
Fermi GRB 200716A: Global MASTER-Net observations report
Date
2020-07-17T11:30:20Z (5 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
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
Subject
GRB 200716A: Swift/BAT-GUANO archival detection and arcminute localization
Date
2021-05-10T21:02:08Z (4 years ago)
From
Aaron Tohuvavohu at U Toronto <aaron.tohu@gmail.com>
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/