[vsnet-grb-info 13692] GRB 130716A: UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15007
SUBJECT: GRB 130716A: UVOT Upper Limits
DATE:    13/07/17 02:01:03 GMT
FROM:    Mike Siegel at PSU/Swift MOC  <siegel at swift.psu.edu>

M. H. Siegel (PSU) and S. Immler (GSFC) report on behalf of the
Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 130716A
120s after the BAT trigger (Cummings et al., GCN Circ. 15006).  No
optical afterglow consistent with the XRT position 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)     120       270         147    >20.47 
white          888      1038         147    >20.90 
v             5858      6057         196    >19.17 
b             5242      5442         196    >20.01
u (fc)         334       583         245    >19.86
uvw1          4832      5032         196    >19.61
uvm2          4627      4827         196    >19.64
uvw2          5653      5853         196    >20.05

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).