TITLE:   GCN CIRCULAR
NUMBER:  29230
SUBJECT: GRB 210102B: Swift-XRT observations
DATE:    21/01/03 13:44:24 GMT
FROM:    Paolo D'Avanzo at INAF - OAB  <paolo.davanzo@inaf.it>

D.N. Burrows (PSU), J. D. Gropp (PSU), J.A. Kennea (PSU), J.P. Osborne
(U. Leicester), K.L. Page (U. Leicester), A. Melandri (INAF-OAB), T.
Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB) 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 210102B (Guo et al. GCN Circ. 29223) in a series of
observations tiled on the sky. The total exposure time is 1.3 ks,
distributed over 7 tiles; the maximum exposure at a single sky location
was 406 s. The data were collected between T0+19.7 ks and T0+26.0 ks,
and are entirely in Photon Counting (PC) mode. 

One uncatalogued X-ray source has been detected, it is below the RASS
limit and shows no definitive signs of fading. Therefore, at the
present time we cannot confirm this as the afterglow. Details of this
source are given below:

Source 1:
  RA (J2000.0):  353.8173  =  23:35:16.14
  Dec (J2000.0): -21.0821  =  -21:04:55.6
  Error: 5.5 arcsec (radius, 90% conf.)
  Count-rate: 0.030 [+0.016, -0.012] ct s^-1   
  Distance: 1289 arcsec from MAXI position.

The results of the XRT-team automatic analysis of the tiled XRT
observations, including a position-specific upper limit calculator, are
available at https://www.swift.ac.uk/xrt_products/TILED_GRB00097.

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