[vsnet-grb-info 11281] GRB 111215A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  12693
SUBJECT: GRB 111215A: Swift/UVOT Upper Limits
DATE:    11/12/16 11:29:50 GMT
FROM:    Samantha Oates at MSSL  <sro at 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. 12681).
No optical afterglow consistent with the XRT position
(Beardmore et al., GCN Circ. 12690) 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).