TITLE:   GCN CIRCULAR
NUMBER:  35117
SUBJECT: GRB 231117A: GECAM-C detection
DATE:    23/11/19 06:27:53 GMT
FROM:    Wang-Chen Xue <wcxuemail@gmail.com>

Wang-Chen Xue, Shao-Lin Xiong and Chen-Wei Wang
report on behalf of the GECAM team:

GECAM-C was triggered on ground by a short burst, GRB 231117A at
2023-11-17T03:03:19.210 UTC (denoted as T0), which has been 
detected by Swift (GCN 35071), AstroSat (GCN 35072), AGILE (GCN 35075),
Konus-Wind (GCN 35079), Glowbug (GCN 35081), and GRBalpha (GCN 35095).

According to the ground data of GECAM-C, this burst mainly consists
of a short pulse with a duration (T90) of 0.59 +/- 0.04 sec (15-4000 keV).

The GECAM-C localization is consistent with the Swift/BAT localization
(GCN 35074) within the error.

The time-averaged spectrum of GECAM-C data from T0 to T0+1.3 s could be
adequately fit by a cut-off power-law with photon index alpha of -1.52 (-0.07, +0.09),
and peak energy Ep of 437 (-174, +556) keV. The corresponding burst fluence is
8.40 (-1.64, +2.70) * 10^-6 erg/cm^2 in 15-4000 keV.

We note that these results are preliminary and refined analysis will be reported later.

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).