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GCN Circular 38728

Subject

GRB 241229A: Swift-XRT observations

Date

2024-12-30T15:20:30Z (3 days ago)

From

Phil Evans at U of Leicester <pae9@star.le.ac.uk>

Via

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 #38726Loading...
 
 ).


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.