GCN Circular 33072

K.L. Page (U. Leicester), M.G. Bernardini (INAF-OAB), E. Ambrosi 
(INAF-IASFPA) , M. Capalbi (INAF-IASFPA), J. D. Gropp (PSU), S.
Dichiara (PSU), J.A. Kennea (PSU), A.P. Beardmore (U. Leicester) and
P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:

Swift-XRT has performed follow-up observations of the
Swift/BAT-GUANO-detected burst GRB 221215A, collecting 2.8 ks of Photon
Counting (PC) mode data between T0+97.3 ks and T0+113.8 ks. 

No X-ray sources have been detected consistent with being within 296
arcsec of the Swift/BAT-GUANO position. The 3-sigma upper limit in the
field is 0.005 ct  s^-1, corresponding to a 0.3-10 keV observed flux of
1.9e-13 erg cm^-2 s^-1 (assuming a typical GRB spectrum).

An uncatalogued was detected, however this was too far from the GRB
position to be the afterglow.

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/00021533.

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