Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 16313

GRB 140516A: further Swift-XRT analysis
2014-05-21T23:42:20Z (10 years ago)
Paolo D'Avanzo at INAF-OAB <>
M. G. Bernardini, P. D'Avanzo, A. Melandri, S. Campana (INAF-OAB), P. A. Evans, K. L. Page (U. Leicester), 
E. Troja (NASA/GSFC/UMCP) report on behalf of the Swift-XRT team:

We have analysed 24.4 ks of XRT data for GRB 140516A (Bernardini et al. GCN Circ. 16285),  
from 92 s to 397.8 ks after the  BAT trigger, in Photon Counting (PC) mode. 

The X-ray counterpart reported by Bernardini et al. (GCN Circ. 16285) and Gompertz 
et al. (GCN Circ. 16291) apparently disappeared in the data collected from t-t0=92.8 ks onwards. 
However, in the same dataset we find evidence for the presence of an unrelated source at 
the position RA, Dec = 252.99269, +39.95659 which is equivalent to:

RA (J2000): 16h 51m 58.25s
Dec (J2000): +39d 57' 23.7"

with an uncertainty of 4.0 arcsec (radius, 90% confidence).

This position is 24" away from the enhanced position for this burst reported by
Osborne et al. (GCN Circ. 16289) while it is consistent with the source
165158.53+395728.9 reported in the Krawczyk et al. (2013; ApJS, 206, 4) QSO
We therefore caution that this field source is likely contaminating the automated late-time 
X-ray light curve of GRB 140516A, given the spatial proximity to its transient 
X-ray counterpart.

[GCN OPS NOTE(22may14): Per author's request, the word "automated" was added 
to the last sentence.]
Looking for U.S. government information and services? Visit