GCN Circular 12693

Subject

GRB 111215A: Swift/UVOT Upper Limits

Event

Date

2011-12-16T11:29:50Z (14 years ago)

From

Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>

S. R. Oates (MSSL-UCL) reports on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 111215A
426 s after the BAT trigger (Oates et al., GCN Circ. 12681Loading...
 
 ).
No optical afterglow consistent with the XRT position
(Beardmore et al., GCN Circ. 12690Loading...
 
 ) 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           426          576          147         >21.7
white              426        19036          645         >22.0
v                  732        13257          608         >20.1
b                  657        18972         1198         >21.6
u                  632         6983          313         >20.7
w1                 608        22616          593         >20.6
m2                 583         6572          313         >20.7
w2                 708        12928         1260         >21.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.06 in the direction of the burst
(Schlegel et al. 1998).