GCN Circular 36887

Wen-Long Zhang, Shao-Lin Xiong, Wen-Jun Tan, Ce Cai, Chen-Wei Wang, Shi-Jie Zheng, Cheng-Kui Li and Peng Zhang report on behalf of the GECAM team:

GECAM-C detected a bright short burst, GRB 240715A, at 2024-07-15T05:44:03.300 UTC (T0), which was also detected by Fermi/GBM (GCN #36866
Not found
 
 
), SVOM/GRM (GCN #36881
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), INTEGRAL/SPI-ACS (TrigID 10791), Konus-Wind (GCN #36886
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). 

The light curve of GECAM-C shows a total duration of ~0.2 sec (30-300 keV). 

Based on the GECAM-C data and the IPN triangulation location (GCN #36872
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) of this burst, the GECAM-C time-averaged spectrum from T0-0.1 to T0+0.1 could be adequately fit by a power law with high energy exponential cutoff function with a fluence of about (2.73 +0.33/-0.30) E-6 erg/cm^2 in 10-1000 keV. The power law index is -0.91 +0.11/-0.09 and the Epeak is 2105 +950/-583 keV. 

The GECAM-C light curve can be found here:
https://twikinew.ihep.ac.cn/pubgecam/Sandbox/GRB/GRB240715A_LightCurve_v01.png

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).