[vsnet-grb-info 13387] GRB 130528A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14721
SUBJECT: GRB 130528A: Swift/UVOT Upper Limits
DATE:    13/05/29 14:39:16 GMT
FROM:    Massimiliano de Pasquale at MSSL-UCL  <m.depasquale at ucl.ac.uk>

M. De Pasquale (MSSL-UCL) and V. D'Elia (ASDC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB
130528A 75 s after the BAT trigger (D'Elia et al., GCN Circ. 14711).
No optical afterglow consistent with the enhanced XRT position
(Goad et al. GCN Circ. 14714) 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            75          225          147         >20.3
u_FC               287          537          246         >19.5
white               75        18737         1239         >21.7
v                  617        11553         1245         >19.9
b                  543        18247         1356         >20.8
u                  287        17334         1583         >21.0
w1                 667        22765         1443         >20.7
m2                 641        12459         1179         >20.7
w2                 592         7143          491         >20.5

The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.16 in the direction
of the burst (Schlegel et al. 1998).