[vsnet-grb-info 9104] GRB 100413A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  10591
SUBJECT: GRB 100413A: Swift/UVOT Upper Limits
DATE:    10/04/14 17:07:25 GMT
FROM:    Frank Marshall at GSFC  <marshall at milkyway.gsfc.nasa.gov>

F.E. Marshall (NASA/GSFC) and S.T. Holland (CRESST/USRA/GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 100413A
150 s after the BAT trigger (Holland et al., GCN Circ. 10581).
No optical afterglow consistent with the enhanced XRT position
(Goad et al., GCN Circ. 10584) is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Poole et al. 2008, MNRAS, 383, 627) for the first finding chart (FC)
exposures and subsequent exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC           150          300          147         >20.5
u_FC               308          558          246         >20.5
white              150         6231          589         >21.8
v                  639         6641          490         >20.4
b                  564         7321          353         >20.7
u                  308         7256          717         >20.7
w1                 688         7051          471         >20.5
m2                 663         6846          490         >20.4
w2                 614         6436          491         >20.8

The values quoted above are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.11 in the direction of the burst
(Schlegel et al. 1998).