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GCN Circular 18069

Subject

GRB 150724B: Swift-XRT observations

Date

2015-07-26T05:24:25Z (9 years ago)

From

Kim Page at U.of Leicester <kpa@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. 18065Not found
 
 
),
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.