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GCN Circular 33969

Subject
GRB 230614C: AstroSat CZTI detection
Date
2023-06-15T18:30:32Z (10 months ago)
From
Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>
P K. Navaneeth (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 GRB 230614C which was also detected by Fermi GBM (Lesage et al., GCN Circ. 33966), and INTEGRAL SPI-ACS (Trigger 10284).

The source was clearly detected in the 20-200 keV energy range. The light curve peaks at 2023-06-14 10:10:33.25 UTC. The measured peak count rate associated with the burst is 2133 (+308, -123) counts/s above the background in the combined data of all quadrants, with a total of 5394 (+562, -588) counts. The local mean background count rate was 456 (+9, -12) counts/s. Using cumulative rates, we measure a T90 of 5.1 (+1.3, -1.2) s. In the preliminary analysis, we find 423 Compton events associated with this event.

The source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2023-06-14 10:10:33.25 UTC. The measured peak count rate associated with the burst is 2148 (+98, -105) counts/s above the background in the combined data of all quadrants, with a total of 5536 (+476, -514) counts. The local mean background count rate was 1459 (+7, -8) counts/s. We measure a T90 of 5.2 (+4.1, -1.5) s from the cumulative Veto light curve.

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.

CZTI GRB detections are reported regularly on the payload site at:
http://astrosat.iucaa.in/czti/?q=grb

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