[vsnet-grb-info 7427] GRB 090313: Swift/UVOT upper limits
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Sat Mar 14 07:50:52 JST 2009
TITLE: GCN CIRCULAR
NUMBER: 8990
SUBJECT: GRB 090313: Swift/UVOT upper limits
DATE: 09/03/13 22:50:45 GMT
FROM: Patricia Schady at MSSL/Swift <ps at mssl.ucl.ac.uk>
P.Schady (MSSL-UCL) S.T. Holland (CRESST/GSFC/USRA) and J. Mao (INAF-OAB)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began observing the field of GRB 0903013 once it came out
of Moon constraint, 27ks after the BAT trigger (Mao et al., GCN Circ.
8980). There is no afterglow detection in any of the b, u or uvw1 UVOT
filter observations taken at the optical afterglow position reported by
Chornock et al. (GCN 8979), although by coadding all filters into a single
exposure, a source is marginally detected at the 2-sigma level.
The 3-sigma upper limits for GRB090313 within each UVOT filter are as
follows:
Filter T_mid(hrs) Exp(s) 3-sig Mag UL
u 7.98 223 > 20.81
b 7.82 885 > 21.36
uvw1 7.57 886 > 21.32
where Tmid is the weighted mean time of the observations. The values
quoted above 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).
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