GCN Circular 14721

Subject

GRB 130528A: Swift/UVOT Upper Limits

Event

Date

2013-05-29T14:39:16Z (13 years ago)

From

Massimiliano de Pasquale at MSSL-UCL <m.depasquale@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. 14711Loading...
 
 ).
No optical afterglow consistent with the enhanced XRT position
(Goad et al. GCN Circ. 14714Loading...
 
 ) 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).