[vsnet-grb-info 18100] BAT trigger 700791 (possible GRB 160622A) is SNR RCW 103

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19548
SUBJECT: BAT trigger 700791 (possible GRB 160622A) is SNR RCW 103
DATE:    16/06/22 14:20:36 GMT
FROM:    Phil Evans at U of Leicester  <pae9 at leicester.ac.uk>

A. D'A^(INAF-IASFPA), P.Evans (U. Leicester), N. Gehrels (NASA/GSFC), C. 
Gronwall (PSU), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), F. E. 
Marshall (NASA/GSFC), A. Maselli (INAF-IASFPA), T. Sakamoto (AGU) and M. 
H. Siegel (PSU) report on behalf of the Swift Team:

Swift has gathered 5.8 ks of WT mode data and 463 s of PC mode data on 
the field of the BAT trigger 700791 (= possible GRB 160622A, GCN 19547).

The XRT image is dominated by diffuse emission from the supernova 
remnant RCW 103 (Frank et al., ApJ, 2015, 810,113), with a bright 
central source at RA,Dec. = 244.40282,  -51.03916,  which is equivalent to:

RA (J2000.0) = 16h 17m 36.68s
Dec (J2000.0) = 51d 02' 21.0"

with an uncertainty of 3.5" (radius, 90% confidence). This is consistent 
with the catalogued X-ray source 3XMM J161736.1-510224. Analysis is 
complicated by the presence of the diffuse emission from the SNR, 
however the source count rate is ~2 ct/sec, with a flux of approximately 
9.1 (+2.0, -1.6) × 10^-11 erg cm^-2 s^-1 (derived from a power-law 
spectrum with NH=7.0 (+3.6, -2.5)e21 cm^-2, and a photon index of 2.2 
(+/- 0.4). This is substantially above the 3XMM count rate of 2.567 (+/- 
0.020)e-12 erg cm^-2 s^-1.

Observations and analysis are ongoing.

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