Skip to main content
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 33679

GRB 230423A: Swift-XRT afterglow detection
2023-04-24T14:11:56Z (a year ago)
Chiara Salvaggio at INAF OABrera <>
C. Salvaggio (INAF-OAB), P. D’avanzo (INAF-OAB), T. Sbarrato (INAF-OAB), R.
Brivio (INAF-OAB), M. Ferro (INAF-OAB), M.G. Bernardini (INAF-OAB), A. Y.
Lien (U Tampa), K.L. Page (U. Leicester), P.A. Evans (U. Leicester) report
on behalf of the Swift-XRT team:

We have analysed 852s of Swift/XRT data for GRB 230423A (R.Brivio et al.,
GCN CIrc. 33677), from t-t0=704.5 s to t+t0=4893.3 s after the BAT trigger
1165354. The trigger was previously indicated as non-burst due to a low BAT
significance detection and the absence of an XRT counterpart (GCN circ.

We found an uncatalogued fading source with coordinates:

RA (J2000): 08h 10m 19.94s

DEC (J2000): -21d 55’ 33.5”

with an uncertainty of 3.8” (radius, 90% confidence).

We propose this source as the X-ray afterglow of GRB 230423A.

The results of the XRT-team automatic analysis are available at

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

Looking for U.S. government information and services? Visit