GCN Circular 33401
Subject
GRB 230304C: AstroSat CZTI detection
Date
2023-03-06T06:43:30Z (2 years ago)
From
Gaurav Waratkar at IIT,Bombay <gauravwaratkar@iitb.ac.in>
P K. Navaneeth (IUCAA), R. Gopalakrishnan (IUCAA), G. Waratkar (IITB),
A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka
University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report
on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al.,
2021, JApA, 42, 73) showed the detection of a GRB 230304C which was also
detected by Fermi-GBM (Fermi GBM team, GCN Circ. 33397).
The source was clearly detected in the 20-200 keV energy range. The
light curve peaks at 2023-03-04 22:01:39.5 UTC. The measured peak count
rate associated with the burst is 93 (+42, -15) counts/s above the
background in the combined data of three quadrants (out of four), with a
total of 410 (+138, -140) counts. The local mean background count rate
was 374 (+2, -3) counts/s. Using cumulative rates, we measure a T90 of
9.34 (+2, -4) s.
It was also detected in the CsI anticoincidence (Veto) detector in the
100-500 keV energy range.
CZTI GRB detections are reported regularly on the payload site at
http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led
consortium of institutes across India, including VSSC, URSC, IUCAA, SAC,
and PRL. The Indian Space Research Organisation funded, managed, and
facilitated the project.