GCN Circular 37311
Subject
GRB 240819A: Swift afterglow confirmation
Date
2024-08-27T16:41:54Z (2 months ago)
From
Antonino D'Ai' at IASF-PA <antonino.dai@inaf.it>
Via
Web form
Antonino D’Ai, Elena Ambrosi (INAF/IASF-PA) report on behalf of the Swift-XRT team:
Swift performed a second epoch follow-up observation for Source2 (D’Avanzo et al., GCN 37218), the likely counterpart for the SVOM/Eclairs-detected X-ray transient GRB 240819A (Coleiro et al., GCN 37208). We collected 3.4 ks of Photon Counting (PC) mode data between T0+6.01 days and T0+7.67 days.
At the position of Source2 (previously detected at rate 11(+3.5, -2.9) x 10^-3 ct/sec), no source is detected with a 3-sigma upper limit of 3.5 x 10^-3 ct/sec.
The upper limit is evidence for the lightcurve fading of this source, confirming the afterglow association with GRB 240819A.
This circular is an official product of the Swift-XRT team.