[vsnet-grb-info 9325] GRB 100526B: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  10808
SUBJECT: GRB 100526B: Swift/UVOT Upper Limits
DATE:    10/05/27 18:26:17 GMT
FROM:    Tyler Pritchard at PSU  <tapritchard at astro.psu.edu>

T. A. Pritchard (PSU) and Siegel (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 100526B
3288 s after the BAT trigger (Siegel et al., GCN Circ. 10799).
No optical afterglow consistent with the XRT position
(Kennea et al., GCN Circ. 10802) 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) exposure and subsequent exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag
--------------------------------------------------------------
white (FC)        3288         3438          147         >21.3
white             3288         4669          344         >21.7
v                 3445         5080          393         >20.2
b                 4265         5880          372         >20.7
u                 4060         5695          393         >20.5
w1                3855         5491          393         >20.7
m2                3650         3849          197         >19.9
w2                4675         4875          197         >20.3

The values quoted above 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).