GCN Circular 35591

Wen-Long Zhang, Shao-Lin Xiong, Chen-Wei Wang, Yue Wang, Yan-Qiu Zhang report on behalf of the GECAM team:

GECAM-B was triggered in-flight by a short burst, GRB 240119A, at 2024-01-19T17:29:07.700 UTC (T0), which was also detected by Fermi/GBM (GCN #35583) and AstroSat CZTI (GCN #35589). At the same time, GECAM-C was also triggered on-ground by this burst. 

According to the light curves, this burst shows a total duration of ~0.1 sec (20-1000 keV). 

According to the in-flight software, GECAM-B localized this burst to the following position (J2000): 
Ra: 355.51 deg   
Dec: -81.39 deg
Err: 5.76 deg (1-sigma, statistical only)
This GECAM-B localization is consistent with that of Fermi/GBM 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).