GCN Circular 42815

Subject

GRB 251116C: Swift-XRT confirmation of fading

Event

GRB 251116C

Date

2025-11-24T10:30:46Z (3 days ago)

From

Matteo Ferro at INAF-OAB <matteo.ferro@inaf.it>

Via

Web form

M. Ferro, M. G. Bernardini, B. Sbarufatti, C. Salvaggio, R. Brivio, A. Mei (INAF-OAB) report on behalf of the Swift-XRT team:

Swift-XRT has conducted further observations of the field of the SVOM/ECLAIRs-detected burst GRB 251116C (Pillas et al., GCN 42703Loading...
 
 ). The observations now extend from T0+10 ks to T0+452 ks and have a total exposure time of 6.1 ks. 

The previously-reported "Source 1" (Evans et al., GCN 42721Loading...
 
 ), is now found to be fading with ~3-sigma significance, and is therefore likely the GRB afterglow. 

The results of the XRT-team automatic analysis of the source are available at https://www.swift.ac.uk/SVOM/team/SVOM_FIELD00051/Source1.php. The results of the full analysis of the XRT observations are available at https://www.swift.ac.uk/SVOM/SVOM_FIELD00051/.

This circular is an official product of the Swift-XRT team.