TITLE: GCN CIRCULAR NUMBER: 40721 SUBJECT: sb25061218: Swift-XRT observations DATE: 25/06/13 15:59:11 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 sb25061218, collecting 1.7 ks of Photon Counting (PC) mode data between T0+5.9 ks and T0+7.7 ks after the trigger. We have detected 2 sources. These have been automatically classified as follows: * 0 likely counterparts * 0 candidate counterparts * 2 uncatalogued X-ray sources * 0 known X-ray sources
Uncatalogued X-ray sources --------------------------
Source 1 (SWIFT J131445.9+544759): ================================== RA (J2000.0): 198.6914 = 13h 14m 45.94s Dec (J2000.0): +54.7999 = +54d 47' 59.6" Error: 11.2 (arcsec, radius, 90% confidence). Detect flag: GOOD Distance: 10.7 arcmin from the SVOM/ECLAIRs position. Mean rate: (9.8 [+3.7, -3.0])e-3 ct s^-1 Mean flux: (4.8 [+1.8, -1.4])e-13 erg cm^-2 s^-1 Peak rate: (9.8 [+3.7, -3.0])e-3 ct s^-1 Peak flux: (4.8 [+1.8, -1.4])e-13 erg cm^-2 s^-1 ECF: 4.85e-11 erg cm^-2 ct^-1, assuming NH=2.15e+20 cm^-2, gamma=1.50; determined from a spectral fit. XMM UL: 2.1e-12 erg cm^-2 s^-1, (0.3-10 keV) so the source is 10.0-sigma above this 3-sigma upper limit. There is no evidence for fading. A SIMBAD object `[VV2006] J131446.6+544804' is 6.6" away.
Source 2 (SWIFT J131433.3+544329): ================================== RA (J2000.0): 198.6390 = 13h 14m 33.36s Dec (J2000.0): +54.7249 = +54d 43' 29.6" Error: 9.7 (arcsec, radius, 90% confidence). Detect flag: GOOD Distance: 6.2 arcmin from the SVOM/ECLAIRs position. Mean rate: (5.9 [+2.8, -2.1])e-3 ct s^-1 Mean flux: (1.01 [+0.47, -0.37])e-13 erg cm^-2 s^-1 Peak rate: (5.9 [+2.8, -2.1])e-3 ct s^-1 Peak flux: (1.01 [+0.47, -0.37])e-13 erg cm^-2 s^-1 ECF: 1.71e-11 erg cm^-2 ct^-1, assuming NH=1.76e+22 cm^-2, gamma=7.90; determined from a spectral fit. XMM UL: 2.4e-12 erg cm^-2 s^-1, (0.3-10 keV) so the source is 54.2-sigma above this 3-sigma upper limit. There is no evidence for fading. A SIMBAD object `SDSS J131433.74+544331.8' is 3.9" away. There is 1 2MASS object within the source's 3-sigma error radius.
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 official product of the Swift-XRT team.
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