TITLE:   GCN CIRCULAR
NUMBER:  27775
SUBJECT: GRB 200517A: Swift-XRT Confirmation of afterglow
DATE:    20/05/21 16:04:22 GMT
FROM:    Jeffrey Gropp at PSU  <jdg44@psu.edu>

J. Gropp (PSU) reports on behalf of the Swift-XRT team:

We provide an update on the XRT light curve evolution of the candidate
X-ray afterglow of GRB 200517A (GCN Circ. 27750).

The XRT light curve now comprises data up to 300 ks from the MAXI trigger
(GCN Circs. 27750). There is a firm indication of fading with respect to
the first observation as reported previously (GCN Circ 27754), with a decay
index of 1.04 (+0.21, -0.18). We thus confirm that this is indeed the
afterglow of GRB 200517A.
The latest results can be viewed via:
https://www.swift.ac.uk/xrt_curves/00020993/

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