[vsnet-grb-info 14764] GRB 140402A: Swift-XRT observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16078
SUBJECT: GRB 140402A: Swift-XRT observations
DATE:    14/04/04 07:30:49 GMT
FROM:    Claudio Pagani at U of Leicester  <cp232 at star.le.ac.uk>

C. Pagani (U. Leicester) reports on behalf of the Swift team:

We report on Swift-XRT observations of the Fermi/GBM and Fermi/LAT-detected GRB 140402A (Jenke, GCN Circ. 16070, Bissaldi, GCN Circ. 16069).

The XRT observations consist of two pointings, the first centered on the reported Fermi/LAT GRB position (Bissaldi, GCN Circ. 16069), the second on the position derived from ground analysis of Swift-BAT data (Cummings, GCN Circ. 16071).

The first XRT pointing consists of 4.5 ks of Photon Counting (PC) mode data, from 33.3 ks to 51.2 ks after the Fermi/LAT trigger and are centered on the LAT position. No source is detected in the XRT data. The 3-sigma upper limit on the count rate is 3.6E-03 cts/s, which is 1.8E-13 erg cm^-2  s^-1  using a typical flux conversion of 5E-11 erg cm^-2 count^-1. These data only partially cover the BAT refined error circle (Cummings, GCN Circ. 16073).

The second XRT pointing consists of 4.9 ks of PC mode data, from 56 ks to 107 ks after the Fermi/LAT trigger and are centered on the BAT position. No source is detected in the XRT data. The 3-sigma upper limit on the count rate is 3.0E-03 cts/s, which is 1.5E-13 erg cm^-2 s^-1  using a typical flux conversion of 5E-11 erg cm^-2 count^-1.

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