[vsnet-grb-info 21237] GRB 181013A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23336
SUBJECT: GRB 181013A: Swift/UVOT Upper Limits
DATE:    18/10/14 00:31:04 GMT
FROM:    Paul Kuin at MSSL  <npkuin at gmail.com>

N. P. M. Kuin (UCL-MSSL) and P. D'Avanzo (INAF-OAB)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 181013A 106 s
after
the BAT trigger (D'Avanzo et al., GCN Circ. 23332). No optical afterglow
consistent
with the XRT position (Osborne et al. GCN Circ. 23334) 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           867         1017          147         >20.2
u_FC               266          516          246         >19.1
white              867         1017          147         >20.2
u                  266          516          246         >19.1
w1                 818         7875          471         >20.4
m2                6035         7669          393         >19.6
w2                5624         7260          393         >20.8

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).