[vsnet-grb-info 17240] GRB 151114A: Swift/UVOT Detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18602
SUBJECT: GRB 151114A: Swift/UVOT Detection
DATE:    15/11/14 19:34:41 GMT
FROM:    Paul Kuin at MSSL  <npkuin at gmail.com>

N. P. M. Kuin (UCL-MSSL) and M. H. Siegel (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 151114A
95 s after the BAT trigger (Siegel et al., GCN Circ. 18599).
A source consistent with the XRT position
(Siegel et al. GCN Circ. 18599)
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  08:03:46.33 = 120.94306 (deg.)
    Dec (J2000) = -61:01:40.0  = -61.02779 (deg.)
with an estimated uncertainty of 0.45 arc sec. (radius, 90% confidence).

Preliminary detections and 3-sigma upper limits 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

white               95          244          147         18.61 +/- 0.06
v                  638         1233           72        >18.4
b                  563         1164           58         19.45 +/- 0.26
u                  307          557          246         18.46 +/- 0.09
w1                 688         1115           39        >18.3
m2                 662         1090           58        >19.2
w2                 613         1215           78        >19.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.17 in the direction of the burst
(Schlegel et al. 1998).