Skip to main content
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 33235

Subject
GRB 230128A: AstroSat CZTI detection
Date
2023-01-30T09:22:07Z (a year 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 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.
Looking for U.S. government information and services? Visit USA.gov