GCN Circular 13161

Subject

GRB 120328A: Swift/UVOT Upper Limits

Event

GRB 120328A

Date

2012-03-28T16:02:39Z (14 years ago)

From

Erik Hoversten at Swift/Penn State <hoversten@astro.psu.edu>

E. A. Hoversten (PSU) and C. Pagani (U. Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 120328A
78 s after the BAT trigger (Pagani et al., GCN Circ. 13147Loading...
 
 ).  No optical
afterglow consistent with the enhanced XRT position (Beardmore el al.,
GCN Circ. 13153Loading...
 
 ) 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            78          228          147         >20.6
u_FC               290          540          246         >19.6
white               78          764          186         >20.5
v                  621          813           39         >18.2
b                  547          739           39         >19.1
u                  290          715          265         >19.8
w1                 670          862           39         >18.9
w2                 769          789           20         >18.6

The magnitudes in the table are not corrected for the Galactic  
extinction
due to the reddening of E(B-V) = 0.73 in the direction of the burst
(Schlegel et al. 1998).