TITLE:   GCN CIRCULAR
NUMBER:  37973
SUBJECT: EP 241021a: further Swift-XRT observations and X-ray counterpart detection
DATE:    24/10/30 14:47:43 GMT
FROM:    Valerio D'Elia at ASDC <valerio.delia@ssdc.asi.it>

V. D’Elia (ASI-SSDC & INAF-OAR) reports on behalf of the Swift-XRT team:

After the rebrightening reported by Quirola-Vasquez et al. (GCN 37930) 6.7 day post trigger, a further Swift follow-up observation was performed. 

The observation was secured between 8.1 and 8.5 days after the EP detection (Hu et al., GCN 37834). The new dataset has an exposure of 4.4 ks. An X-ray source is now detected at the position of the optical transient (see, e.g., Fu et al., GCN 37840) with a S/N of about 3. The count rate of the X-ray counterpart is (3+/-1)E-3 cts s^-1, corresponding to a 0.3-10 keV
observed flux of (1.3+/-0.4)E-13 erg cm^-2 s^-1 (assuming a typical GRB spectrum).

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