TITLE:   GCN CIRCULAR
NUMBER:  32807
SUBJECT: GRB 221017A: Swift-XRT observations
DATE:    22/10/20 14:42:17 GMT
FROM:    Phil Evans at U of Leicester  <pae9@leicester.ac.uk>

J.P. Osborne (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), K.L. Page (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 MAXI-detected
burst GRB 221017A (Nawa et al. GCN Circ. 32777), collecting 1.9 ks of
Photon Counting (PC) mode data between T0+196.7 ks and T0+225.8 ks. 

Two uncatalogued sources are detected:

- Source 1
RA (J2000.0): 116.8816 = 07:47:31.58
Dec (J2000.0): 39.3449 = +39:20:41.5
Error: 10.7" (radius, 90% confidence)
Avg. XRT count-rate: 5.4(+2.6,-2.0)x10^(-3) cts/s

- Source 2 
RA (J2000.0): 116.9220 = 07:47:41.27
Dec (J2000.0): 39.2614 = +39:15:41.2
Error: 10.0" (radius, 90% confidence)
Avg. XRT count-rate: 3.3(+2.1,-1.5)x10^(-3) cts/s

Both sources lie inside the overlap of the MAXI localization error box
(Nawa et al. GCN Circ. 32777) and the IPN triangulation region (Kozyrev
et al. GCN Circ. 32787).


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/00021529.

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