[vsnet-grb-info 12763] GRB 121229A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14122
SUBJECT: GRB 121229A: Swift/UVOT Upper Limits
DATE:    12/12/29 19:01:22 GMT
FROM:    Samantha Oates at MSSL  <sro at mssl.ucl.ac.uk>

S. R. Oates (MSSL-UCL) and E. Sonbas (NASA/GSFC/Adiyaman Univ.)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 121229A
155 s after the BAT trigger (Sonbas et al., GCN Circ. 14115).
No optical afterglow consistent with the optical position
(Varela et al. GCN Circ. 14117)
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           155          305          147         >20.9
u_FC               314          563          246         >19.9
white              155         6156          363         >21.2
v                  644         6466          116         >18.9
b                  570         5952          216         >20.5
u                  314         5747          442         >20.1
w1                3947         4136          186         >20.0
m2                 670          690           19         >17.6
w2                 620         6362          216         >20.1

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.16 in the direction of the burst
(Schlegel et al. 1998).