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GCN Circular 30622

Subject

GRB 210802A: Further Swift/XRT observation and afterglow confirmation

Date

2021-08-09T13:55:33Z (3 years ago)

From

Valerio D'Elia at ASDC <valerio.delia@ssdc.asi.it>

V. D'Elia (ASI-SSDC & INAF-OAR) and S.B. Cenko (GSFC) report on behalf of the Swift-XRT team:


Swift-XRT has performed further follow-up observations of the Fermi burst (Longo et al., GCN Circ. 30589Not found
 
 
; Roberts et al., GCN Circ. 30590Not found
 
 
).

The possible afterglow reported in Sbarufatti et al. (GCN Circ. 30591Not found
 
 
, "source 7") is no longer detected in a 4 ks observation, down to a three sigma upper limit of 4.8E-3 cts/s (corresponding to 1.28E-13 erg/cm^2/s) at the position of the transient. This value is significantly below the previously reported flux value for the candidate, thus confirming ���source 7��� as the afterglow of GRB 210802A.

The results of the full analysis of the XRT observations are available at https://www.swift.ac.uk/xrt_curves/00021456/.

This circular is an official product of the Swift-XRT team.