[vsnet-grb-info 8925] GRB 100213A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  10420
SUBJECT: GRB 100213A: Swift/UVOT Upper Limits
DATE:    10/02/14 12:39:40 GMT
FROM:    Peter Curran at MSSL  <pac at mssl.ucl.ac.uk>

P.A. Curran (MSSL-UCL) and D. Grupe (PSU) report on behalf of the
Swift/UVOT team:


The Swift/UVOT began settled observations of the field of GRB 100213A
77s after the BAT trigger (Grupe et al., GCN 10411). No optical
afterglow consistent with the XRT position (Beardmore et al., GCN 10418) 
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 exposures are:

Filter    T_start(s)   T_stop(s)  Exp(s)  Mag
------------------------------------------------
white     77           227        147     >20.20
v         59           68         9       >17.19
u         289          366        75      >19.7


The values quoted above are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.31 in the direction of the burst
(Schlegel et al. 1998).