[vsnet-grb-info 3630] GRB060814: Break in the XRT light curve

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  5464
SUBJECT: GRB060814: Break in the XRT light curve 
DATE:    06/08/17 17:21:36 GMT
FROM:    Alberto Moretti at Obs Brera Merate  <alberto.moretti at brera.inaf.it>

A. Moretti (INAF-OAB), C. Guidorzi (Univ. Bicocca & INAF-OAB),
P. Romano (INAF-OAB), D.N. Burrows (PSU), N. Gehrels (GSFC)
report on behalf of the Swift-XRT team:

Based on the most recent downlinked data on GRB060814 (trigger number
224552) we find clear evidence of a break in the light curve at
42(+/-6) ks from the burst trigger (see the light curve at
http://www.brera.inaf.it/~moretti/grbplot/xrt060814.gif )
which could be a jet break.
The light curve slope steepens from 1.04+/-0.05 to 1.9+/-0.3
(errors are quoted at 90% confidence level).
In order to convert the XRT count rate to absorbed (unabsorbed)
flux the conversion factor is 4.9E-11 (8.5E-11)

Therefore we encourage optical data collection on this GRB in order to
measure the redshift and to test whether this break is achromatic.

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