GRB 230703A
GCN Circular 34188
Subject
GRB 230703A detected with multiple GRID detectors
Date
2023-07-10T06:21:09Z (2 years ago)
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.
GCN Circular 34210
Subject
GRB 230703A: CALET Gamma-Ray Burst Monitor detection
Date
2023-07-13T06:33:14Z (2 years ago)
From
Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>
Y. Akaike (Waseda U), A. Yoshida, T. Sakamoto, S. Sugita (AGU),
Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA),
Y. Asaoka (ICRR), S. Torii, K. Kobayashi (Waseda U),
Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC),
M. L. Cherry (LSU), S. Ricciarini (U of Florence),
P. S. Marrocchesi (U of Siena),
and the CALET collaboration:
The long GRB 230703A (Fermi GBM Trigger Number 710117592;
GRID detection: Wang et al., GCN Circ. 34188) triggered the
CALET Gamma-ray Burst Monitor (CGBM) at 22:53:04.92 UTC
on 3 July 2023
(http://cgbm.calet.jp/cgbm_trigger/flight/1372459956/index.html).
The burst signal was seen by all CGBM detectors.
The burst light curve shows a double-peaked structure that starts
at T+2.1 sec, peaks at T+4.0 sec, and ends at T+17.5 sec.
The T90 and T50 durations measured by the SGM data are 13.5 +/- 0.6 sec
and 7.9 +/- 0.4 sec (40-1000 keV), respectively.
The ground-processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1372459956/
The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at Waseda University.