GRB 211216A
GCN Circular 31237
Subject
GRB 211216A: Fermi GBM Final Real-time Localization
Date
2021-12-16T06:57:07Z (3 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 06:45:52 UT on 16 Dec 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 211216A (trigger 661329957.05626 / 211216282).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 44.4, Dec = -64.3 (J2000 degrees, equivalent to J2000 02h 57m, -64d 17'), with a statistical uncertainty of 1.1 degrees.
The angle from the Fermi LAT boresight is 31.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211216282/quicklook/glg_skymap_all_bn211216282.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211216282/quicklook/glg_healpix_all_bn211216282.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211216282/quicklook/glg_lc_medres34_bn211216282.gif
GCN Circular 31238
Subject
Fermi GRB 211216A: Global MASTER-Net observations report
Date
2021-12-16T07:15:07Z (3 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov,
D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, T.Pogrosheva, E.Minkina,
A.Chasovnikov, V.Topolev, V.Grinshpun, 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
(Irkutsk State University, API),
A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov
(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 GRB 211216A ( Fermi GBM team, GCN 31237) errorbox 2 sec after trigger time at 2021-12-16 06:45:54 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 56 deg. The sun altitude is -26.7 deg.
The galactic latitude b = -48 deg., longitude l = 283 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=1816175
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
12 | 2021-12-16 06:45:54 | MASTER-OAFA | (02h 53m 22.27s , -62d 10m 10.3s) | C | 20 | 17.1 |
57 | 2021-12-16 06:45:54 | MASTER-OAFA | (02h 53m 22.27s , -62d 10m 10.4s) | C | 110 | 17.7 | Coadd
57 | 2021-12-16 06:46:33 | MASTER-OAFA | (03h 00m 27.56s , -62d 56m 56.5s) | C | 30 | 17.2 |
111 | 2021-12-16 06:47:23 | MASTER-OAFA | (02h 53m 25.66s , -62d 10m 21.1s) | C | 40 | 16.5 |
176 | 2021-12-16 06:48:23 | MASTER-OAFA | (02h 53m 18.92s , -62d 10m 50.7s) | C | 50 | 17.3 |
253 | 2021-12-16 06:49:35 | MASTER-OAFA | (02h 53m 18.87s , -62d 09m 50.3s) | C | 60 | 17.6 |
420 | 2021-12-16 06:52:22 | MASTER-OAFA | (02h 40m 59.42s , -62d 49m 23.1s) | C | 60 | 17.7 |
499 | 2021-12-16 06:53:41 | MASTER-OAFA | (02h 58m 51.51s , -62d 47m 34.8s) | C | 60 | 17.7 |
614 | 2021-12-16 06:55:01 | MASTER-OAFA | (02h 57m 39.11s , -63d 45m 40.4s) | C | 130 | 18.4 |
778 | 2021-12-16 06:57:30 | MASTER-OAFA | (02h 57m 41.60s , -63d 44m 08.1s) | C | 160 | 18.4 |
968 | 2021-12-16 07:00:29 | MASTER-OAFA | (02h 57m 35.23s , -63d 45m 07.3s) | C | 180 | 18.5 |
1167 | 2021-12-16 07:03:49 | MASTER-OAFA | (02h 57m 36.92s , -63d 44m 08.1s) | C | 180 | 18.5 |
1367 | 2021-12-16 07:07:08 | MASTER-OAFA | (02h 57m 42.14s , -63d 45m 07.7s) | C | 180 | 18.5 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 31239
Subject
GRB 211216A: BALROG localization (Fermi Trigger 661329957 / GRB 211216282)
Date
2021-12-16T07:22:31Z (3 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
661329957 at 06:45:52 on 16 Dec. 2021 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) = 51.0+/-2.4 deg
Decl.(2000.0) = -62.2+/-4.0 deg
We estimate an additional systematic error of 2 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB211216282/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB211216282/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB211216282/json
GCN Circular 31240
Subject
GRB 211216A: GECAM detection
Date
2021-12-16T08:22:21Z (3 years ago)
From
Wangchen Xue at IHEP <xuewc@ihep.ac.cn>
W. C. Xue, S. Xiao, Y. Q. Zhang, S. L. Xiong, C. Cai, P. Zhang,
C. Y. Li, S. L. Xie, X. Y. Zhao, Y. Huang, X. Y. Song,
J. C. Liu, Y. Zhao, Z. W. Guo, C. Zheng, C. W. Wang,
Q. B. Yi, B. X. Zhang, W. X. Peng, R. Qiao, D. Y. Guo, X. B. Li,
X. Ma, L. M. Song, P. Wang, J. Wang, Z. Zhang, S. J. Zheng, W. Chen,
J. J. He, G. Y. Zhao, Y. Q. Du, H. Wu, J. Liang, Q. Luo, X. L. Zhang,
H. M. Zhang, Z. H. An, M. Gao, K. Gong, B. Li, C. Li, J. H. Li,
X. Q. Li, Y. G. Li, X. H. Liang, X. J. Liu, Y. Q. Liu, X. L. Sun,
Y. L. Tuo, J. Z. Wang, X. Y. Wen, Y. B. Xu, Y. P. Xu, S. Yang,
C. Y. Zhang, D. L. Zhang, Fan Zhang, Fei Zhang,
X. Zhou, F. J. Lu, S. N. Zhang (IHEP)
report on behalf of GECAM team:
During the commissioning phase, GECAM-B was triggered in-flight by a long burst,
GRB 211216A, at 2021-12-16T06:45:56.050 UTC (denoted as T0), which was also
observed by Fermi/GBM (GCN #31237).
GECAM alert data was downlinked to the ground through the short message
service of BeiDou Navigation Satellite System (BDS) within ~60 s after T0.
According to the BDS alert data, this burst mainly consists of a broad pulse
with a duration of about 20 s.
The GECAM light curve could be found here:
http://twiki.ihep.ac.cn/pub/GECAM/GRBList/gecamb_lc_grd_all_combine_93336356.png
Using the automatic on-ground localization pipeline with the BDS alert data,
GECAM-B localized this burst to the following position (J2000):
Ra: 57.22 deg
Dec: -63.04 deg
Err: 5.71 deg (1-sigma, statistical only)
The current systematic error of location is estimated to be several degrees
which could be minimized by the ongoing calibration.
GECAM location is consistent with the Fermi/GBM position within the error.
Please note that all GECAM results here are preliminary. The final analysis
will be published in journal papers or GECAM online catalog.
Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor
(GECAM) mission consists of two small satellites (GECAM-A and GECAM-B) in
Low Earth Orbit (600 km, 29 deg), launched on Dec 10, 2020 (Beijing Time),
which was funded by the Chinese Academy of Sciences (CAS).
GCN Circular 31250
Subject
GRB 211216A: Swift/BAT-GUANO detection outside the coded FOV
Date
2021-12-17T03:15:52Z (3 years ago)
From
Aaron Tohuvavohu at U Toronto <aaron.tohu@gmail.com>
Aaron Tohuvavohu (U Toronto), James DeLaunay (UAlabama), Gayathri
Raman (PSU), Jamie A. Kennea (PSU), report:
Swift/BAT did not localize GRB 211216A (T0: 2021-12-16T06:45:52 UTC,
Fermi/GBM GCN 31237, GECAM GCN 31240, BALROG GCN 31239,
INTEGRAL/SPI-ACS trig #9564).
The Fermi, INTEGRAL, and GECAM notices, 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 BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu,
arXiv:2111.01769), detects the burst with a sqrt(TS) of 11.2 in a
8.192 s analysis time bin.
NITRATES results are consistent with a burst coming from outside the
coded FOV, with DeltaLLHOut of 6.
An out of FOV origin is consistent with the Fermi/GBM RoboBA, GECAM,
and BALROG localizations.
See Section 9.1 and Figure 20 in the NITRATES paper for brief
descriptions and interpretation of sqrt(TS), DeltaLLHPeak, and
DeltaLLHOut.
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/
GCN Circular 31263
Subject
GRB 211216A: Fermi GBM observation
Date
2021-12-18T09:27:56Z (3 years ago)
From
Elisabetta Bissaldi at INFN,Bari <elisabetta.bissaldi@ba.infn.it>
E. Bissaldi (Politecnico and INFN Bari) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 06:45:52.06 UT on 16 December 2021, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 211216A (trigger 661329957 / 211216282),
which was also detected by the Swift/BAT-GUANO (Tohuvavohu et al. 2021, GCN 31250)
and by GECAM-B (Xue et al. 2021, GCN 31240).
The GBM on-ground location is reported in GCN 31237.
The GBM light curve shows a FRED-like emission episode
with a duration (T90) of about 20 s (50-300 keV).
The time-averaged spectrum from T0 to T0+20 s is
well fit by a power law function with an exponential
high-energy cutoff. The power law index is -0.47 +/- 0.05 and
the cutoff energy, parameterized as Epeak, is 208 +/- 7 keV.
The event fluence (10-1000 keV) in this time interval is
(9.16 +/- 0.02)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+6.3 s in the 10-1000 keV band
is 5.4 +/- 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/"