TITLE: GCN CIRCULAR NUMBER: 38728 SUBJECT: GRB 241229A: Swift-XRT observations DATE: 24/12/30 15:20:30 GMT FROM: Phil Evans at U of Leicester <pae9@star.le.ac.uk> M. A. Williams (PSU), S. Dichiara (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), R. Brivio (INAF-OAB), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAR), 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 241229A, collecting 1.9 ks of Photon Counting (PC) mode data between T0+65.5 ks and T0+72.9 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. This source is 7.1 arc-seconds from the 2nd source in the list of the afterglow candidates reported by Einstein Probe/FXT (GCN #38726). Details of this source are given below: Source 1: RA (J2000.0): 192.8735 = 12:51:29.63 Dec (J2000.0): +31.7474 = +31:44:50.6 Error: 4.3 arcsec (radius, 90% conf. [Enhanced position]) Count-rate: 0.0172 +/- 0.0038 ct s^-1 Distance: 399 arcsec from SVOM/ECLAIRs position. Flux: (4.32 +/- 0.96)e-13 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/00021751. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/38728. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...