GCN Circular 15229

Subject

GRB 130912A: Swift/UVOT Upper Limits

Event

Date

2013-09-15T20:52:11Z (13 years ago)

From

Margaret Chester at PSU <chester@astro.psu.edu>

M. M. Chester (PSU) and V. D'Elia (ASDC) report on behalf of the 
Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 130912A
99 s after the BAT trigger (D'Elia et al., GCN Circ. 15212Loading...
 
 ).
No optical afterglow consistent with the enhanced XRT position 
(Beardmore et al. GCN Circ. 15217Loading...
 
 ) 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) exposures and subsequent exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC            99          249          147         >20.7
u_FC               311          561          246         >20.2
white               99         6848          785         >21.4
v                  640        23984         1395         >20.3
b                  566        30470         1907         >21.6
u                  311        36236         3907         >21.6
w1                 690        35508         3836         >22.1
m2                1070        34601         2827         >21.8
w2                 616        23070         1376         >21.6

The magnitudes in the table are not corrected for the Galactic 
extinction due to the reddening of E(B-V) = 0.28 in the direction 
of the burst (Schlegel et al. 1998).