[vsnet-grb-info 17847] GRB 160411A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19291
SUBJECT: GRB 160411A: Swift/UVOT Upper Limits
DATE:    16/04/11 17:40:56 GMT
FROM:    Mike Siegel at PSU/Swift MOC  <siegel at swift.psu.edu>

M. H. Siegel (PSU) and K. L. Page (U Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 160411A
3139 s after the BAT trigger (Page et al., GCN Circ. 19279).
No optical afterglow consistent with the XRT position
(Perri et al. GCN Circ. 19281)
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          3139         3289          147         >20.5
white             3139         4521          344         >21.0
v                 3295         4931          393         >19.4
b                 4116         4316          197         >19.9
u                 3910         5546          393         >20.0
w1                3705         5342          393         >20.2
m2                3500         5136          393         >20.1
w2                4527         4726          197         >20.0

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).