[vsnet-grb-info 18248] GRB 160712A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19696
SUBJECT: GRB 160712A: Swift/UVOT Upper Limits
DATE:    16/07/13 18:19:55 GMT
FROM:    Lea Hagen at PSU  <lea.zernow.hagen at gmail.com>

L. M. Z. Hagen (PSU) reports on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 160712A
3998 s after the BAT trigger (Hagen et al., GCN Circ. 19684). No
optical afterglow consistent with the XRT position (Beardmore et al.,
GCN Circ. 19690) or the possible optical afterglow candidate (Kruehler
et al., GCN Circ. 19693; Troja et al., GCN Circ. 19695) 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 exposures are:

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

white             3998         4148          147        >20.47
v                 4154         4354          196        >19.04
b                 4974         5027           52        >19.17
u                 4769         4969          196        >19.66
uvw1              4564         4764          196        >19.58
uvm2              4359         4559          196        >19.52

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.08 in the direction of the burst
(Schlegel et al. 1998).