GCN Circular 35026

Wen-Long Zhang, Shao-Lin Xiong, Yan-Ting Zhang, Chen-Wei Wang, Wang-Chen Xue, Ce Cai, Ping Wang, Yue Huang, Jin Wang report on behalf of the GECAM team:

A short burst was triggered at 2023-11-11T21:35:11.400 UTC (T0) during the routine on-ground search of GECAM-B data, which was also detected by Swift/BAT (GCN #35022) and Fermi/GBM (trigger number 721431316). 

According to the GECAM-B light curve in about 40-300 keV, this burst mainly consists of a short pulse with duration of about 25 ms.

The time-integrated spectrum of GECAM-B data from T0-0.05 s to T0+0.05 s can be fitted by the blackbody function, with the best fit parameters kT = 17.3 +/- 2.3 keV. The energy fluence is about 5.9E-8 erg/cm^2 in 40-300 keV.

GECAM-B localized this burst to the following position (J2000): 
Ra: 235 deg 
Dec: -45 deg
Err: 5 deg (1-sigma, statistical only)
This GECAM-B localization is consistent with SGR J1555-5402 within the error, which is confirmed by the Swift/BAT-GUANO arcminute localization (GCN #35022).

Please note that all GECAM results here are preliminary. The final analysis will be reported.

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).