GRB 211229B
GCN Circular 31379
Subject
GRB 211229B: Fermi GBM observation
Date
2022-01-03T22:56:35Z (4 years ago)
From
Cori Fletcher at USRA <cfletcher@usra.edu>
C. Fletcher (USRA) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 22:18:43.10 UT on 29 December 2021, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 211229B (trigger 662509128 / 211229930)
which was also detected by the Swift/BAT-GUANO (Raman et al. 2022, GCN 31375),
GECAM (Zhao et al. 2021, GCN 31339), AGILE (Ursi et al. 2021, GCN 31344)
and INTEGRAL/SPI-ACS (#9581). The Fermi GBM Final Real-time Localization (GCN 31336)
is consistent with the GECAM position.
The angle from the Fermi LAT boresight at the GBM trigger time is 59 degrees.
The GBM light curve consists of a single peak
with a duration (T90) of about 24 s (50-300 keV).
The time-averaged spectrum from T0-15 s to T0+8.6 s is
best fit by a power law function with an exponential
high-energy cutoff. The power law index is -1.14 +/- 0.05 and
the cutoff energy, parameterized as Epeak, is 565 +/- 110 keV.
The event fluence (10-1000 keV) in this time interval is
(8.8 +/- 0.4)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+1.3 s in the 10-1000 keV band
is 12.4 +/- 0.3 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 31375
Subject
GRB 211229B: Swift/BAT-GUANO detection outside the coded FOV
Date
2022-01-03T17:54:26Z (4 years ago)
From
Aaron Tohuvavohu at U Toronto <aaron.tohu@gmail.com>
Gayathri Raman (PSU), Aaron Tohuvavohu (U Toronto), James DeLaunay
(UAlabama), Jamie A. Kennea (PSU), report:
Swift/BAT did not localize GRB 211229B (T0: 2021-12-29T22:18:43 UTC,
Fermi/GBM GCN 31336, GECAM GCN 31339, AGILE GCN 31344,
INTEGRAL/SPI-ACS #9581).
The INTEGRAL, Fermi, 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 12.4 in a
4.096 s analysis time bin.
NITRATES results are consistent with a burst coming from outside the
coded FOV, with DeltaLLHOut of 5.
An out of FOV origin is consistent with the Fermi/GBM and GECAM 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 31344
Subject
GRB 211229B: AGILE detection
Date
2021-12-31T14:35:32Z (4 years ago)
From
Alessandro Ursi at INAF/IAPS <alessandro.ursi@gmail.com>
A. Ursi (INAF/IAPS), C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), M.
Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, C.
Casentini, Y. Evangelista, E. Menegoni, L. Foffano, G. Piano (INAF/IAPS),
F. Lucarelli (SSDC, and INAF/OAR), A. Bulgarelli, A. Di Piano, V. Fioretti,
F. Fuschino, N. Parmiggiani (INAF/OAS-Bologna), M. Marisaldi
(INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois
(INAF/OA-Cagliari), I. Donnarumma (ASI), F. Longo (Univ. Trieste and INFN
Trieste), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team:
The AGILE satellite detected the long GRB 211229B at T0 = 2021-12-29
22:18:43 (UTC), reported by Fermi GBM (GCN #31336) and GECAM (GCN #31339).
The burst is clearly visible in the AGILE scientific ratemeters of the
SuperAGILE (SA; 20-60 keV), MiniCALorimeter (MCAL; 0.4-100 MeV), and
AntiCoincidence (AC; 50-200 keV) detectors. The event lasted about 40 s and
it released a total number of 5440 counts in the SA detector (above a
background rate of 120 Hz), 48230 counts in the MCAL detector (above a
background rate of 1170 Hz), and 141030 counts in the AC detector (above a
background rate of 3440 Hz). The AGILE ratemeters light curves can be found
at http://www.agilescienceapp.it/notices/GRB211229B_AGILE_RM.png .
The event also triggered a partial high time resolution MCAL data
acquisition, covering the main peak of the burst, from T1 = 2021-12-29
22:18:45.12 s +/- 0.01 (UTC) to T2 = 2021-12-29 22:18:48.83 +/- 0.01 s
(UTC), and released 2354 counts in the detector, above a background rate of
620 Hz. The time-integrated spectrum of the burst in this time interval can
be fitted in the energy range 0.4-20 MeV with a power-law with ph. ind. =
-2.45 (-0.82/+1.53), resulting in a reduced chi-squared of 1.40 (34 d.o.f.)
and a fluence of 1.8e-06 ergs/cm^2 (90% confidence level), in the same
energy range. The MCAL light curve can be found at:
http://www.agilescienceapp.it/notices/GRB211229B_AGILE_MCAL.png .
Additional analysis of AGILE data is in progress. Automatic MCAL GRB alert
Notices can be found at: https://gcn.gsfc.nasa.gov/agile_mcal.html.
GCN Circular 31339
Subject
GRB 211229B: GECAM detection
Date
2021-12-30T03:35:18Z (4 years ago)
From
Guoying Zhao at IHEP <gyzhao@ihep.ac.cn>
G. Y. Zhao, S. L. Xiong, X. L. Zhang , S. Xiao, C. Cai, J. J. He, Y. Huang,
Z. W. Guo, C. Y. Li, X. B. Li, J. C. Liu, X. Y. Song,Y. Zhao, P. Wang,
S. L. Xie, W. C. Xue,Q. B. Yi, Y. Q. Zhang, X. Y. Zhao, C. Zheng, Y. Q. Du,
D. Y. Guo, J. Liang, F. J. Lu, Q. Luo, X. Ma, W. X. Peng, R. Qiao, L. M. Song,
J. Wang, H. Wu, P. Zhang, S. N. Zhang, Z. Zhang,C. W. Wang, S. J. Zheng (IHEP),
report on behalf of GECAM team:
During the commissioning phase, GECAM-B was triggered in-flight by a
long bright burst, GRB 211229B, at 2021-12-29T22:18:43.150 UTC (denoted as T0)���
which was also observed by Fermi/GBM (GCN #31336).
This burst mainly consists of multiple pulses with duration of about 15 s.
The GECAM light curve could be found here:
http://twiki.ihep.ac.cn/pub/GECAM/GRBList/211229B_LightCurve.png
The GECAM preliminary location could be found here:
http://twiki.ihep.ac.cn/pub/GECAM/GRBList/SkyMap.png
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 31337
Subject
Fermi GRB 211229B: Global MASTER-Net observations report
Date
2021-12-29T22:45:22Z (4 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),
B.L.Carrasco, J.R.Valdes,V.Chavushyan, C.J.Martinez, V.M.Patino Alvarez,
M.L.H.Rodriguez (INAOE, OAGH)
A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov
(Blagoveschensk Educational State University)
MASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 211229B ( Fermi GBM team, GCN 31336) errorbox 706 sec after notice time and 746 sec after trigger time at 2021-12-29 22:31:09 UT, with upper limit up to 15.0 mag. The observations began at zenith distance = 86 deg. The sun altitude is -64.4 deg.
The galactic latitude b = 44 deg., longitude l = 293 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=1832170
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
822 | 2021-12-29 22:31:09 | MASTER-Kislovodsk | (12h 18m 50.50s , -18d 16m 56.8s) | P- | 150 | 14.6 |
1007 | 2021-12-29 22:34:00 | MASTER-Kislovodsk | (12h 18m 40.48s , -18d 41m 39.4s) | C | 180 | 15.0 |
1208 | 2021-12-29 22:37:21 | MASTER-Kislovodsk | (12h 18m 41.80s , -18d 40m 33.5s) | C | 180 | 14.8 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 31336
Subject
GRB 211229B: Fermi GBM Final Real-time Localization
Date
2021-12-29T22:29:19Z (4 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 22:18:43 UT on 29 Dec 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 211229B (trigger 662509128.09648 / 211229930).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 185.0, Dec = -18.4 (J2000 degrees, equivalent to J2000 12h 20m, -18d 23'), with a statistical uncertainty of 1.1 degrees.
The angle from the Fermi LAT boresight is 59.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211229930/quicklook/glg_skymap_all_bn211229930.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/bn211229930/quicklook/glg_healpix_all_bn211229930.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211229930/quicklook/glg_lc_medres34_bn211229930.gif