[vsnet-grb-info 26366] GRB 200914A: Swift-XRT further observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  28466
SUBJECT: GRB 200914A: Swift-XRT further observations
DATE:    20/09/21 17:19:16 GMT
FROM:    Paolo D'Avanzo at INAF-OAB  <pda.davanzo at gmail.com>

P. D’Avanzo (INAF-OAB), T. Sbarrato (INAF-OAB), M. G. Bernardini (INAF-OAB), 
A. Melandri  (INAF-OAB) and P.A. Evans (U. Leicester) report on behalf of the 
Swift-XRT team:

Swift-XRT has performed further follow-up observations of the INTEGRAL-detected
burst GRB 200914A (Mereghetti et al. GCN Circ. 28419), collecting 5.7 ks of Photon 
Counting (PC) mode data between T0+325 ks and T0+395 ks. 

The only uncatalogued source in the field, Source 1 (Perri et al., GCN Circ. 28425), 
is not detected anymore down to a 3sigma count rate limit of 2.1e-3 ct s^-1. 
>From a re-analysis of the first XRT observation, consisting in 1.2 ks of data collected between 
T+9.0 ks and T+10.2 ks, we measure a count rate of 6.6e-3 (+3.3e-3, -2.5e-3) ct s^-1. 

Although there is moderate evidence for fading between these two epochs, we cannot exclude 
that the observed X-ray emission is coming from the bright IR source reported in Perri et al. 
(GCN Circ. 28425), possibly unrelated to GRB 200914A. 


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