[vsnet-grb-info 13002] GRB 130327A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14339
SUBJECT: GRB 130327A: Swift/UVOT Upper Limits
DATE:    13/03/27 14:22:35 GMT
FROM:    Craig Swenson at PSU/Swift  <cswenson at astro.psu.edu>

C. A. Swenson (PSU) and T. N. Ukwatta (MSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 130327A
104 s after the BAT trigger (Ukwatta et al., GCN Circ. 14331).
No optical afterglow consistent with the XRT position
(Osborne et al. GCN Circ. 14335)
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           104          254          147         >21.2
u_FC               317          567          246         >20.0
white              104         6491          727         >21.8
v                  646         6877          428         >19.8
b                  572         6286          432         >20.7
u                  317         6081          659         >20.4
w1                 695        12014         1111         >21.6
m2                 671        11107         1141         >21.0
w2                 622         6696          452         >21.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.13 in the direction of the burst
(Schlegel et al. 1998).