[vsnet-grb-info 23443] GRB 190828A: Swift-XRT observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  25542
SUBJECT: GRB 190828A: Swift-XRT observations
DATE:    19/08/29 09:46:09 GMT
FROM:    Paolo D'Avanzo at INAF - OAB  <paolo.davanzo at inaf.it>

J.A. Kennea (PSU), A.P. Beardmore (U. Leicester), J.P. Osborne (U.
Leicester), M.G. Bernardini (INAF-OAB), E. Ambrosi  (INAF-IASFPA) , M.
Capalbi (INAF-IASFPA), B. Sbarufatti (PSU), D.N. Burrows (PSU) 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 190828A (Sugita et al. GCN Circ. 25502) 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 393 s. The data were collected between T0+48.4 ks and T0+49.8 ks,
and are entirely in Photon Counting (PC) mode. 

No X-ray sources have been detected. The 3-sigma upper limit in the
field (not including the regions where the tiles overlap) ranges from
~0.02 to ~0.15 ct s^-1, corresponding to a 0.3-10 keV observed flux of
9.9e-13 to 5.8e-12 erg cm^-2 s^-1 (assuming a typical GRB spectrum).

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_GRB00086.

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