GCN Circular 13206

Subject

GRB 120403B: Swift/UVOT Upper Limits

Event

GRB 120403B

Date

2012-04-04T11:35:55Z (14 years ago)

From

Alice Breeveld at MSSL-UCL <aab@mssl.ucl.ac.uk>

A. A. Breeveld (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 120403B
911s after the BAT trigger (D'Elia et al., GCN Circ. 13203Loading...
 
 ).
No optical afterglow consistent with the XRT position
(Goad et al., GCN Circ. 13205Loading...
 
 ) 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           911         1061          147         >21.7
white             1190         7931          568         >22.0
v                 1068         8342          588         >20.7
b                 1166         7726          568         >21.3
u                 1141        12488          404         >21.1
w1                1117         9020          851         >21.1
m2                1092         8547          568         >20.8
w2                1216         8137          485         >21.0

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).