[AAVSO-HEN] GRB 090814B: Swift/UVOT Upper Limits

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html

TITLE:   GCN CIRCULAR
NUMBER:  9807
SUBJECT: GRB 090814B: Swift/UVOT Upper Limits
DATE:    09/08/14 17:39:59 GMT
FROM:    Peter Curran at MSSL  <pac at mssl.ucl.ac.uk>

P.A. Curran (MSSL-UCL) and W.H. Baumgartner (GSFC/UMBC) report on behalf
of the Swift/UVOT team:


Swift/UVOT observed the field of the INTEGRAL GRB 090814B (Beckmann et
al. GCN. Circ. 9795), gathering 950s of data in the from interval T0+9ks
to T0+14 ks.

No optical afterglow consistent with the Swift XRT position (Evans et
al., GCN 9803)  is detected in the UVOT exposures.  Preliminary 3-sigma
upper limits, using the UVOT photometric system (Poole et al. 2008,
MNRAS, 383, 627), are:

Filter   T_start(s)   T_stop(s)   Exp(s)   Mag
u        8044	      14166       506      >20.32
w2       8485	      8933        441      >20.30

The values quoted above are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 1.10 in the direction of the burst
(Schlegel et al. 1998).