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GCN Circular 35157

GRB 231122B: GECAM detection
2023-11-22T16:23:45Z (3 months ago)
Chenwei Wang at IHEP <>
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Chen-Wei Wang, Shao-Lin Xiong report on behalf of the GECAM team:
GECAM-B was triggered in-flight by a long burst, GRB 231122B 
at 2023-11-22T15:12:41.050 UTC (denoted as T0), 
which was also detected by CALET/GBM (trigger num 1384701074).

According to the realtime alert data of GECAM-B, this burst mainly consists of many pulses
with a duration of about 50 s. The time-averaged spectrum from T0 to T0+17 s 
could be adequately fit by a power law with high energy exponential cutoff function 
with a fluence of about 9.8E-6 erg/cm2 in 20-1000 keV.

Using the automatic on-ground localization pipeline with the realtime alert data, 
GECAM-B localized this burst to the following position (J2000): 
Ra: 106.2 deg 
Dec: -21.3 deg
Err: 1.5 deg (1-sigma, statistical only)

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).
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