[vsnet-grb-info 13684] GRB 130708A: Swift XRT and UVOT Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15001
SUBJECT: GRB 130708A: Swift XRT and UVOT Observations
DATE:    13/07/10 20:07:37 GMT
FROM:    Alessandro Maselli at INAF/IASF Palermo  <maselli at ifc.inaf.it>

A. Maselli (INAF-IASF Palermo) and A. Breeveld (MSSL-UCL) report on behalf of the Swift XRT and UVOT teams:

The Swift/XRT started observing the field of the BAT ground-detected GRB 130708A (Cummings, GCN Circ. 14997) on 2013-07-09 at 14:49:07 UT, 97564 s after the BAT trigger. In 3881 s of XRT data in Photon Counting mode we detected no significant X-ray source within the BAT error circle. The 3-sigma upper limit at the reported BAT position is 4.0E-03 cts/s.

The Swift/UVOT began settled observations of the field of GRB 130708A 97557 s after the BAT trigger. No optical afterglow consistent with the BAT position is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white            97741       107968         1001         >21.6
v                97926       103874         1037         >20.1
u                97557       107909         1804         >21.4

The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.03 in the direction of the burst (Schlegel et al. 1998).

This circular is an official product of the Swift XRT and UVOT teams.