[vsnet-grb-info 16788] GRB 150724B: Swift-XRT observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18069
SUBJECT: GRB 150724B: Swift-XRT observations
DATE:    15/07/26 05:24:25 GMT
FROM:    Kim Page at U.of Leicester  <kpa at star.le.ac.uk>

J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), C. Pagani (U.
Leicester), V. D'Elia (ASDC), A. D'ai (INAF-IASFPA), A. Maselli 
(INAF-IASFPA), L.M. McCauley (PSU), J.A. Kennea (PSU), B. Sbarufatti
(INAF-OAB/PSU) and P.A. Evans (U. Leicester) report on behalf of the
Swift-XRT team:

Swift-XRT has performed follow-up observations of the
Fermi/LAT-detected burst GRB 150724B (Bissaldi et al. GCN Circ. 18065),
collecting 1.8 ks of Photon Counting (PC) mode data between T0+94.4 ks
and T0+96.2 ks. 

One uncatalogued X-ray source has been detected, it is below the RASS
limit and shows no definitive signs of fading. Therefore, at the
present time we cannot confirm this as the afterglow. Details of this
source are given below:

Source 1:
  RA (J2000.0):  351.8904  =  23:27:33.70
  Dec (J2000.0): +3.8186  =  +03:49:06.8
  Error: 4.3 arcsec (radius, 90% conf.)
  Count-rate: 0.0143 +/- 0.0033 ct s^-1
  Flux: (4.6 +/- 1.1)e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)

The results of the XRT-team automatic analysis of the XRT observations,
including a position-specific upper limit calculator, are available at
http://www.swift.ac.uk/ToO_GRBs/00020543.

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