TITLE: GCN CIRCULAR NUMBER: 38949 SUBJECT: GRB 250114B: Swift-XRT observations DATE: 25/01/15 10:01:45 GMT FROM: Phil Evans at U of Leicester pae9@star.le.ac.uk
M. A. Williams (PSU), S. Dichiara (PSU), J.A. Kennea (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR), B. Sbarufatti (INAF-OAB) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
Swift-XRT has performed follow-up observations of the INTEGRAL-detected burst GRB 250114B, collecting 5.3 ks of Photon Counting (PC) mode data between T0+11.3 ks and T0+44.6 ks.
One uncatalogued X-ray source has been detected within the estimated 3-sigma INTEGRAL error region (197 arcsec), 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 2: RA (J2000.0): 48.8582 = 03:15:25.96 Dec (J2000.0): -2.2940 = -02:17:38.2 Error: 7.6 arcsec (radius, 90% conf.) Count-rate: (2.62 [+1.04, -0.84])e-3 ct s^-1 Distance: 81 arcsec from INTEGRAL position. Flux: (1.33 [+0.53, -0.43])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)
Two 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/00021756.
This circular is an official product of the Swift-XRT team.
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