GRB 231122A
GCN Circular 35156
Subject
GRB 231122A: Fermi GBM Final Real-time Localization
Date
2023-11-22T12:55:01Z (2 years ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely LONG GRB
At 12:44:22 UT on 22 Nov 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231122A (trigger 722349867.684022 / 231122531).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 108.4, Dec = -5.5 (J2000 degrees, equivalent to J2000 07h 13m, -5d 30'), with a statistical uncertainty of 3.8 degrees.
The angle from the Fermi LAT boresight is 87.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231122531/quicklook/glg_skymap_all_bn231122531.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231122531/quicklook/glg_healpix_all_bn231122531.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231122531/quicklook/glg_lc_medres34_bn231122531.gif
GCN Circular 35158
Subject
GRB 231122A: GECAM detection
Date
2023-11-22T16:40:17Z (2 years ago)
From
Chenwei Wang at IHEP <cwwang@ihep.ac.cn>
Via
Web form
Chen-Wei Wang, Shao-Lin Xiong report on behalf of the GECAM team:
GECAM-C was triggered in-flight by a long burst, GRB 231122A
at 2023-11-22T12:44:26.350 UTC (denoted as T0),
which was also detected by Fermi/GBM (GCN #35156).
According to the realtime alert data of GECAM-C, this burst mainly consists of many pulses
with a duration of about 50 s. The time-averaged spectrum from T0 to T0+4 s
could be adequately fit by a power law with high energy exponential cutoff function
with a fluence of about 6.8E-6 erg/cm2 in 20-1000 keV.
Using the automatic on-ground localization pipeline with the realtime alert data,
GECAM-C localized this burst to the following position (J2000):
Ra: 106.1 deg
Dec: -7.8 deg
Err: 14.2 deg (1-sigma, statistical only)
GECAM location is consistent with that of Fermi/GBM within the error.
We note that this analysis is based on realtime alert data and thus very preliminary.
Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor
(GECAM) mission originally consists of two micro-satellites (GECAM-A and GECAM-B)
launched in Dec. 2020. As the third member of GECAM constellation,
GECAM-C was launched onboard SATech-01 experimental satellite in July 2022.
GECAM mission is funded by the Chinese Academy of Sciences (CAS).