[vsnet-grb-info 18141] GRB 160625B: Swift/UVOT Detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19589
SUBJECT: GRB 160625B: Swift/UVOT Detection
DATE:    16/06/26 11:15:45 GMT
FROM:    Samantha Oates at MSSL  <sro at mssl.ucl.ac.uk>

GRB 160625B: Swift/UVOT Detection

S. R. Oates (U. Warwick) and A. D'A� (INAF-IASFPA)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 160625B
9616 s after the LAT trigger (Dirirsa et al., GCN Circ. 19580).
A source consistent with the RATIR position (Troja et al. GCN Circ. 19588)
and the edge of the XRT position (Melandri et al. GCN Circ. 19585)
is detected in the initial UVOT exposures.

Preliminary detections using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are: 

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

u                 9616         9978          353         16.41 +/- 0.04

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.12 in the direction of the burst
(Schlegel et al. 1998).