[vsnet-grb-info 16831] GRB 150801A: Swift-XRT observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18112
SUBJECT: GRB 150801A: Swift-XRT observations
DATE:    15/08/03 17:53:41 GMT
FROM:    Boris Sbarufatti at INAF-OAB/IASFPA  <boris.sbarufatti at brera.inaf.it>

A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), D.N.
Burrows (PSU), T.G.R. Roegiers (PSU), L.M. McCauley (PSU), A.P.
Beardmore (U. Leicester), B.P. Gompertz (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 150801A (Ishikawa et al. GCN Circ. 18102) in a series of
observations tiled on the sky. The total exposure time is 3.8 ks,
distributed over 4 tiles; the maximum exposure at a single sky location
was 1.6 ks. The data were collected between T0+50.8 ks and T0+62.9 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
~0.006 to ~0.009 ct s^-1, corresponding to a 0.3-10 keV observed flux
of 2.4e-13 to 3.8e-13 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 http://www.swift.ac.uk/xrt_products/TILED_GRB00047.

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