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 long GRB230128A which was
also detected by Fermi GBM (GCN Circ. 33231).
It was clearly detected in the CsI anticoincidence (Veto) detector in
the 100-500 keV energy range. The light curve peaks at 2023-01-28
22:48:33.09 UTC. The measured peak count rate is 669 (+68, -52) counts/s
above the background in the combined Veto data of all quadrants, with a
total of 9446 (+1558, -2165) counts. The local mean background count
rate was 2912 (+3, -5) counts/s. We measure a T90 of 53 (+12, -16) s
from the cumulative Veto light curve.
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.