GCN Circular 37876
Subject
EP 241021a: Swift-XRT observations
Date
2024-10-25T14:42:21Z (2 months ago)
From
Phil Evans at U of Leicester <pae9@star.le.ac.uk>
Via
email
J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A. Melandri
(INAF-OAR), T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB), M. A.
Williams (PSU), S. Dichiara (PSU), J.A. Kennea (PSU), A.P. Beardmore
(U. Leicester) and P.A. Evans (U. Leicester) reports on behalf of the
Swift-XRT team:
Swift-XRT has performed follow-up observations of the Einstein
Probe-detected fast X-ray transient EP 241021a, collecting 2.6 ks of
Photon Counting (PC) mode data between T0+315.9 ks and T0+327.3 ks.
No X-ray sources have been detected consistent with being within 2.0
arcsec of the Einstein Probe position. The 3-sigma upper limit at the
transient position is ~0.003 ct s^-1, corresponding to a 0.3-10 keV
observed flux of 1.3e-13 erg cm^-2 s^-1 (assuming a typical GRB
spectrum).
We note that GCN Circ. 37870 initially incorrectly referred to this
source as GRB 241021A. The results of the XRT-team automatic analysis
of the XRT observations, including a position-specific upper limit
calculator, are available at https://www.swift.ac.uk/ToO_GRBs/00021725.
This circular is an official product of the Swift-XRT team.