TITLE:   GCN CIRCULAR
NUMBER:  34168
SUBJECT: GRB 230707A: Swift-XRT observations
DATE:    23/07/08 09:04:40 GMT
FROM:    Phil Evans at U of Leicester <pae9@star.le.ac.uk>

A. Tohuvavohu (U. Toronto), A.P. Beardmore (U. Leicester), J.P. Osborne
(U. Leicester), M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC &
INAF-OAR), B. Sbarufatti (INAF-OAB), D.N. Burrows (PSU), J. D. Gropp
(PSU) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT
team:

Swift-XRT has performed follow-up observations of the
Swift/BAT-GUANO-detected burst GRB 230707A, collecting 4.7 ks of Photon
Counting (PC) mode data between T0+32.7 ks and T0+51.0 ks. 

No X-ray sources have been detected consistent with being within 197
arcsec of the Swift/BAT-GUANO position. The 3-sigma upper limit in the
field ranges from ~0.002 to ~0.003 ct s^-1, corresponding to a 0.3-10
keV observed flux of 9.4e-14 to 1.3e-13 erg cm^-2 s^-1 (assuming a
typical GRB spectrum).

Three uncatalogued sources were detected too far from the GRB position
to be likely afterglow candidates.

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/00021587.

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