[vsnet-grb-info 16727] GRB 150710A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18008
SUBJECT: GRB 150710A: Swift/UVOT Upper Limits
DATE:    15/07/10 20:15:24 GMT
FROM:    Massimiliano de Pasquale at IASF-Palermo  <m.depasquale at ucl.ac.uk>

M. De Pasquale (UCL-MSSL) and M.G. Bernardini (INAF/OAB)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 150710A
54 s after the BAT trigger (Bernardini et al., GCN Circ. 18000).
No optical afterglow consistent with the position of the XRT sources
(Bernardini et al., GCN Circ 18005) 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            54          204          147         >20.6
u_FC               266          516          246         >19.9

white               54         1017          334         >21.1
v                  595         1050           41         >18.1
b                  521          714           39         >19.1
u                  266          516          285         >20.0
uw1                645          837           39         >18.5
um2                620          812           39 >18.2
uw2                571         1043           58         >19.0

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).