TITLE: GCN CIRCULAR NUMBER: 40378 SUBJECT: GRB 250506A: Swift-XRT observations DATE: 25/05/07 09:35:26 GMT FROM: Phil Evans at U of Leicester pae9@star.le.ac.uk
D.N. Burrows (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), M. A. Williams (PSU), S. Dichiara (PSU) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
Swift-XRT has performed follow-up observations of the SVOM/MXT-detected burst GRB 250506A at the revised position given in GCN Circ. 40364, collecting 2.9 ks of Photon Counting (PC) mode data between T0+63.2 ks and T0+70.1 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): 219.28269 = 14:37:7.85 Dec (J2000.0): +28.87835 = +28:52:42.1 Error: 2.6 arcsec (radius, 90% conf. [Enhanced position]) Count-rate: 0.0586 +/- 0.0052 ct s^-1 Distance: 84 arcsec from SVOM/MXT position. Flux: (2.16 +/- 0.19)e-12 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 https://www.swift.ac.uk/ToO_GRBs/00021828.
This circular is an official product of the Swift-XRT team.
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