[vsnet-grb-info 15892] GRB 141212A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17180
SUBJECT: GRB 141212A: Swift/UVOT Upper Limits
DATE:    14/12/13 10:59:10 GMT
FROM:    Samantha Oates at MSSL  <sro at mssl.ucl.ac.uk>

S. R. Oates (IAA-CSIC/UCL-MSSL) and T. N. Ukwatta (LANL)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 141212A
72 s after the BAT trigger (Ukwatta et al., GCN Circ. 17158).
No optical afterglow consistent with the XRT position
(Osborne et al. GCN Circ. 17164)
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 first
finding chart (FC) exposure and subsequent exposures are:

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

white_FC            72          222          147         >20.6
u_FC               286          535          246         >19.9
white               72         1531          392         >21.2
v                  615         1581          117         >18.8
b                  541         1681          117         >19.8
u                  286         1655          343         >20.1
w1                 664         1631          117         >19.3
w2                 591         1210           39         >18.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.10 in the direction of the burst
(Schlegel et al. 1998).