TITLE:   GCN CIRCULAR
NUMBER:  39829
SUBJECT: GRB 250312A: GECAM-A detection
DATE:    25/03/22 05:44:25 GMT
FROM:    zhengchao_astro@foxmail.com

Jia-Cong Liu, Shao-Lin Xiong, Peng Zhang, Yan-Qiu Zhang,  Chen-Wei Wang (IHEP) report on behalf of the GECAM team:

GECAM-A detected a long burst, GRB 250312A, at 2025-03-12T13:24:17 UTC (denoted as T0), which was also observed by Swift/BAT (A. Melandri et al. 2025, GCN 39686). 

According to the GECAM-A light curves in about 50-200 keV, this burst mainly consists of a pulse with a T90 of about 5.0 ± 0.2 s.

The GECAM light curve can be found here:
https://www.bursthub.cn//admin/static/gecamgrb250312A.png

We note that these results are preliminary. Refined 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).