[vsnet-grb-info 14599] GRB 140301A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15913
SUBJECT: GRB 140301A: Swift/UVOT Upper Limits
DATE:    14/03/04 04:27:15 GMT
FROM:    Mike Siegel at PSU/Swift MOC  <siegel at swift.psu.edu>

B. Porterfield (PSU) and R. Starling (U Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 140301A
95 s after the BAT trigger (Page et al., GCN Circ. 15896).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 15898)
is detected in the initial UVOT exposures. 
No counterpart consistent with the optical counterpart observed by 
NOT (Kruehler et al. GCN Circ. 15899) is detected.
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           108          258          292         >21.8
u_FC               320          744          265         >20.7
white              108          920          231         >21.1
v                  650          843           38         >18.7
v                 6583        22273          392         >20.2
b                  749          769           19         >19.2
b                27968        28212          240         >21.0
u                  320          744          265         >20.7
w1                 700          719           19         >17.9
w1               11294        45552         1408         >21.1
w2                 799          818           19         >17.8
w2                6378        58531         1122         >21.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).