TITLE: GCN CIRCULAR NUMBER: 40217 SUBJECT: SVOM/sb25042207: XRT observations DATE: 25/04/23 13:45:35 GMT FROM: Antonino D'Ai' at IASF-PA antonino.dai@inaf.it
Antonino D'Aì (INAF/IASFPA), J. A. Kennea (PSU), Elena Ambrosi (INAF/IASFPA), Valerio D'Elia (SSDC & INAF-OAR), Andrea Melandri (INAF-OAR) reports on behalf of the Swift-XRT team:
We have analysed 1.8 ks of XRT data for the SVOM/ECLAIRs-detected X-ray transient sb25042207 (Liang et al., GCN Circ. 40213), from T0+3.8 ks to T0+5.6 ks after the SVOM/ECLAIRs trigger. The data are entirely in Photon Counting (PC) mode.
We detect two previously known X-ray sources and two uncatalogued X-ray sources within the ECLAIRs error circle. We note that the ECLAIRs error region overlaps with the Coma cluster region, a well-known galaxy cluster that exhibits significant diffuse X-ray emission.
Details of the uncatalogued sources:
Source 2: RA (J2000): 194.93972 = 12:59:45.53 Dec (J2000): +27.8781 = +27:52:41.0 Error: 6.0 arcsec (radius, 90% confidence) Count rate: 8 (+5, -4) x 10^-3 ct/s Flux: [3.5 (+2.1, -1.9)] x 10^-13 erg/cm^2/s (observed, 0.3–10 keV)
Source 4: RA (J2000): 195.13942 = 13:00:33.46 Dec (J2000): +27.7478 = +27:44:52.0 Error: 7.5 arcsec (radius, 90% confidence) Count rate: 0.011 (+0.005, -0.004) ct/s Flux: [4.8 (+2.1, -1.8)] x 10^-13 erg/cm^2/s (observed, 0.3–10 keV)
Both sources are below the RASS limit and show no definitive signs of fading.
The results of the XRT team's automatic analysis of the tiled XRT observations, including a position-specific upper limit calculator, are available at: https://www.swift.ac.uk/SVOM/SVOM_FIELD00013/
This circular is an official product of the Swift-XRT team.
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