TITLE:   GCN CIRCULAR
NUMBER:  35782
SUBJECT: GRB 240222A: GECAM detection of a burst
DATE:    24/02/23 06:22:36 GMT
FROM:    wenlongzhang2018@163.com

Sheng-Lun Xie, Shao-Lin Xiong, Wen-Long Zhang report on behalf of the GECAM team:

GECAM-B was triggered in-flight and on-ground by a short burst, GRB 240222A, at 2024-02-22T08:51:31.500 UTC (T0), which was also observed by Fermi/GBM (GCN #35769 and GCN #35778) and Swift/BAT (GCN #35770 and GCN #35781). 

According to the GECAM-B light curve, this burst consists of roughly a pulse with a total duration of ~3 sec. 

The GECAM-B ground calculated location (J2000) is:
Ra: 169.76 deg   
Dec: -71.58 deg
Err: 14.01 deg (1-sigma, statistical only)
This GECAM-B localization is consistent with that of Swift/BAT within the error.

We note that these results are very preliminary. Refined analysis will be reported later.

Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor(GECAM) mission originally consists of two microsatellites (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).