TITLE: GCN CIRCULAR NUMBER: 41086 SUBJECT: GRB 250713A: Swift-XRT observations DATE: 25/07/14 05:58:35 GMT FROM: Phil Evans at U of Leicester pae9@star.le.ac.uk
P.A. Evans (U. Leicester), J.A. Kennea (PSU), E. Ambrosi (INAF-IASFPA) , A.P. Beardmore (U. Leicester), M.G. Bernardini (INAF-OAB), R. Brivio (INAF-OAB), D.N. Burrows (PSU), S. Campana (INAF-OAB), M. Capalbi (INAF-OAR), A. D'Ai (INAF-IASFPA), P. D'Avanzo (INAF-OAB), V. D'Elia (SSDC & INAF-OAR), S. Dichiara (PSU), M. Ferro (INAF-OAB), A. Melandri (INAF-OAR), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), M. Perri (SSDC & INAF-OAR), C. Salvaggio (INAF-OAB), T. Sbarrato (INAF-OAB), B. Sbarufatti (INAF-OAB), M.A. Williams (PSU) report on behalf of the Swift-XRT team:
Swift-XRT has performed follow-up observations of the SVOM/ECLAIRs-detected source GRB 250713A, collecting 2.0 ks of Photon Counting (PC) mode data between T0+429 s and T0+6.4 ks after the trigger. We have detected 1 source. This has been automatically classified as an uncatalogued X-ray source.
Uncatalogued X-ray sources --------------------------
Source 1 (SWIFT J222820.3+385214): ================================== RA (J2000.0): 337.0847 = 22h 28m 20.33s Dec (J2000.0): +38.8706 = +38d 52' 14.2" Error: 7.0 (arcsec, radius, 90% confidence). Detect flag: GOOD Distance: 8.2 arcmin from the SVOM/ECLAIRs position. Mean rate: (7.7 [+2.8, -2.3])e-3 ct s^-1 Mean flux: (2.94 [+1.07, -0.88])e-13 erg cm^-2 s^-1 Peak rate: (7.7 [+2.8, -2.3])e-3 ct s^-1 Peak flux: (2.94 [+1.07, -0.88])e-13 erg cm^-2 s^-1 ECF: 3.84e-11 erg cm^-2 ct^-1, assuming NH=1.27e+21 cm^-2, gamma=1.63; determined from a spectral fit. XMM UL: 2.2e-12 erg cm^-2 s^-1, (0.3-10 keV) so the source is 19.2-sigma above this 3-sigma upper limit. There is no evidence for fading.
This source is not spatially consistent with any of those detected by EP-FXT (Circ. 41085).
All fluxes are 0.3-10 keV, observed. For all flux conversions and comparisons with catalogues and upper limits from other missions, we assumed a power-law spectrum with NH=3x10^20 cm^-2 and photon index (Gamma)=1.7 unless otherwise stated.
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/SVOM.
This circular is an officicial product of the Swift-XRT team.
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