GCN Circular 36305
Subject
LIGO/Virgo/KAGRA S240422ed: 2.5m PRL Telescope follow-up of the Swift/XRT source S240422ed_X190
Date
2024-04-25T15:46:41Z (13 days ago)
From
Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>
Via
Web form
V. Swain (IITB), G. Waratkar (IITB), A. Salgundi (IITB), R. Kumar (IITB), A. Suresh (IITB), U. Pathak (IITB), V. Bhalerao (IITB), S. Wadawale (PRL), P. Neelam (PRL), K. Dhakar (PRL), A. Chakraborty (PRL):
We observed the field of the rank 2 source S240422ed_X190 detected by Swift/XRT (Evans et al., GCN Circ. 36278) with the PRL 2.5m telescope (arXiv:2401.07715). The observation started at 2024-04-24 15:00:17 UT, i.e., 1.73 days after the LVK trigger (GCN Circ. 36236). We obtained a single exposure of 40 min in the Bessel V filter. Photometric calibration was performed with respect to field stars from the NOMAD catalogue.
We did not detect any source within the Swift/XRT uncertainty circle. We obtain an upper limit of 19.9 mag (5 sigma) in our image, where the sensitivity was limited due to the high airmass of observations. This is consistent with the upper limits reported in Ducoin et al., GCN Circ. 36299.
We thank the PRL team for their support during the observation. The 2.5m telescope at the Mt. Abu observatory is operated by the Physical Research Laboratory (PRL) Ahmedabad, supported by the Department of Space, Government of India.