TITLE: GCN CIRCULAR NUMBER: 36145 SUBJECT: GRB 240415B: GECAM-B detection DATE: 24/04/17 09:39:18 GMT FROM: xiesl@mails.ccnu.edu.cn

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

GECAM-B was triggered in-flight and on-ground by a short burst, GRB 240415B, at 2024-04-15T03:10:49.150 UTC (T0), which was also observed by Swift/BAT (GCN #36125).

According to the GECAM-B light curve, this burst consists of roughly a pulse with a total duration of ~250 ms.

The GECAM-B ground calculated location (J2000) is: Ra: 156.77 deg Dec: -20.78 deg Err: 11.16 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).

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