[vsnet-grb-info 17324] GRB151212A: Swift/UVOT observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18689
SUBJECT: GRB151212A: Swift/UVOT observations
DATE:    15/12/13 18:49:23 GMT
FROM:    Massimiliano de Pasquale at IASF-Palermo  <m.depasquale at ucl.ac.uk>

M. De Pasquale (PSU) and P. Evans (U. Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began observing the field of MAXI-detected GRB 151212A
(Nahakira et al., GCN Circ. 18685) 42183 s after the trigger.
No optical afterglow consistent with the XRT source given by Evans
et al. (GCN Circ 18687) is detected in the UVOT exposures.

Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the summed UVOT
exposures is:

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

u              42183       48392          2939 >21.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.04 in the direction of the burst
(Schlegel et al. 1998).