TITLE: GCN CIRCULAR NUMBER: 39362 SUBJECT: GRB 250213A: Swift-XRT observations DATE: 25/02/18 15:33:01 GMT FROM: Phil Evans at U of Leicester pae9@star.le.ac.uk
J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), M. Capalbi (INAF-IASFPA), M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR), M. A. Williams (PSU), S. Dichiara (PSU), J.A. Kennea (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/ECLAIRs-detected burst GRB 250213A, collecting 3.3 ks of Photon Counting (PC) mode data between T0+26.1 ks and T0+50.5 ks.
Three uncatalogued X-ray sources have been detected, 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 2: RA (J2000.0): 112.5572 = 07:30:13.74 Dec (J2000.0): -19.9494 = -19:56:57.9 Error: 9.1 arcsec (radius, 90% conf. [Enhanced position]) Count-rate: (5.8 [+2.0, -1.6])e-3 ct s^-1 Distance: 578 arcsec from SVOM/ECLAIRs position. Flux: (4.2 [+1.4, -1.2])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)
Source 3: RA (J2000.0): 112.5390 = 07:30:9.37 Dec (J2000.0): -20.1093 = -20:06:33.6 Error: 6.4 arcsec (radius, 90% conf.) Count-rate: (3.4 [+1.4, -1.2])e-3 ct s^-1 Distance: 175 arcsec from SVOM/ECLAIRs position. Flux: (6.4 [+2.7, -2.2])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV)
Source 4: RA (J2000.0): 112.2781 = 07:29:6.75 Dec (J2000.0): -20.0889 = -20:05:19.9 Error: 6.3 arcsec (radius, 90% conf.) Count-rate: (3.0 [+1.6, -1.2])e-3 ct s^-1 Distance: 712 arcsec from SVOM/ECLAIRs position. Flux: (5.9 [+3.1, -2.3])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV)
A catalogued source was also detected.
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/00021777.
This circular is an official product of the Swift-XRT team.
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