TITLE:   GCN CIRCULAR
NUMBER:  34188
SUBJECT: GRB 230703A detected with multiple GRID detectors
DATE:    23/07/10 06:21:09 GMT
FROM:    GRID Student Team at Tsinghua University <grid@tsinghua.edu.cn>

Chenyu Wang and Zirui Yang report on behalf of the GRID Collaboration:

The long-duration GRB 230703A (Fermi GBM Trigger Number bn230703954) was also detected with three GRID detectors, GRID-03B, GRID-04, and GRID-07, onboard two different CubeSats. 

The event was triggered by GRID on 2023-07-03 at 22:53:07.4 UTC.  The GRID light curves show a two-pulse temporal structure, each with a fast rise exponential decay like shape. The measured burst duration (T90) in the 30-2000 keV range is approximately 18.6 +/- 1.2 seconds. The GRB position derived from the GRID data is consistent with the burst location reported by Fermi/GBM (GCN Notice #710117592). An origin from Cygnus X-1 can be ruled out as the source is occulted by Earth in the view of GRID-03B. Further analysis of the data is currently in progress. 

GRID is a student-led project to monitor the transient gamma-ray sky with multiple detectors onboard different nanosatellites in the era of multi-messenger astronomy. For more information about GRID, please refer to the following references: https://doi.org/10.1007/s10686-019-09636-w and https://doi.org/10.1007/s10686-021-09819-4.