GCN Circular 36981
Subject
GRB 240715A: Swift-XRT afterglow detection
Date
2024-07-30T16:04:49Z (4 months ago)
From
Chiara Salvaggio at INAF OABrera <chiara.salvaggio@inaf.it>
Via
email
C. Salvaggio (INAF-OAB), K. L. Page (U. Leicester) and P.A. Evans (U.
Leicester) reports on behalf of the Swift-XRT team:
Swift-XRT has performed further follow-up observations of the IPN-detected
burst GRB 240715A (Kozyrev et al., GCN Circ. 36872). The data were
collected between T0+36.0 ks ks and T0+1270 ks, for a total exposure time
of 17.7 ks.
The uncatalogued X-ray source reported by D'Elia et al. ("Source 3"; GCN
Circ. 36890), with a count-rate of 4.0 [+1.4, -1.2]e-3 ct s^-1, is no more
detected: we derive an upper limit of 1.4e-3 ct s^-1. Source 3 shows
significant signs of fading, and is therefore likely the GRB afterglow.
The X-ray afterglow light curve can be modelled with a power-law with no
breaks and decay index alpha > 0.63.
The results of the XRT-team automatic analysis are available at
https://www.swift.ac.uk/xrt_products/00021699.
This circular is an official product of the Swift-XRT team.