TITLE: GCN CIRCULAR NUMBER: 42307 SUBJECT: GRB 251014A: Swift-XRT observations DATE: 25/10/16 13:51:56 GMT FROM: Phil Evans at U of Leicester pae9@star.le.ac.uk
A.P. Beardmore (U. Leicester), A. Melandri (INAF-OAR), T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB), J.A. Kennea (PSU), D.N. Burrows (PSU), S. Lanava (PSU), J.P. Osborne (U. Leicester) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
We have analysed 6.2 ks of Photon Counting (PC) mode XRT data for GRB 251014A, collected between T0+101.1 ks and T0+174.7 ks.
Three uncatalogued X-ray sources have been detected within the estimated 3-sigma Swift-BAT error region (296 arcsec), however none of them is above the RASS limit or shows definitive signs of fading. Therefore, at the present time we cannot identify which, if any, is the afterglow. Details of these sources are given below:
Source 5: RA (J2000.0): 111.7316 = 07h 26m 55.58s Dec (J2000.0): +6.4150 = +06d 24' 53.9" Error: 6.7 arcsec (radius, 90% conf.) Count-rate: (2.33 [+0.88, -0.72])e-3 ct s^-1 Distance: 1 arcsec from Swift-BAT position. Flux: (1.11 [+0.42, -0.34])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)
Source 8: RA (J2000.0): 111.6918 = 07h 26m 46.04s Dec (J2000.0): +6.4252 = +06d 25' 30.7" Error: 6.1 arcsec (radius, 90% conf.) Count-rate: (2.25 [+0.88, -0.72])e-3 ct s^-1 Distance: 148 arcsec from Swift-BAT position. Flux: (7.1 [+2.8, -2.3])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV)
Source 9: RA (J2000.0): 111.7868 = 07h 27m 08.82s Dec (J2000.0): +6.3731 = +06d 22' 23.3" Error: 5.6 arcsec (radius, 90% conf.) Count-rate: (1.42 [+0.73, -0.56])e-3 ct s^-1 Distance: 247 arcsec from Swift-BAT position. Flux: (4.8 [+2.5, -1.9])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV)
Seven uncatalogued sources were also detected too far from the GRB position to be likely afterglow candidates.
The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/ToO_GRBs/01403878.
This circular is an official product of the Swift-XRT team.
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