[vsnet-grb-info 13266] GRB 130504C: Swift-XRT afterglow confirmation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14603
SUBJECT: GRB 130504C: Swift-XRT afterglow confirmation
DATE:    13/05/08 15:13:43 GMT
FROM:    Paolo D'Avanzo at INAF-OAB  <paolo.davanzo at brera.inaf.it>

P. D'Avanzo (INAF-OAB), A.Y. Lien (NASA-GSFC), P.A. Evans (U. Leicester)
report on behalf of the Swift-XRT team:

We have analysed 12.3 ks of XRT data for the Fermi-LAT-detected burst GRB
130504C (Kocevski et al. GCn Circ 14574),  from 65.6 ks to 278.7 ks after
the  Fermi-LAT trigger. The data are entirely in Photon Counting (PC)
mode.  The X-ray source reported by D'Avanzo et al. (GCN Circ. 14584,
14588) displays a fading behaviour.

The overall light curve can be modelled with a power-law decay with a
decay index of alpha=1.39 (+0.32, -0.25).

We confirm it as the X-ray afterglow of GRB 130504C.

The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00020267.