[vsnet-grb-info 6606] GRB 080906: Refined Swift/UVOT Photometric
Redshift
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Thu Sep 11 23:38:38 JST 2008
TITLE: GCN CIRCULAR
NUMBER: 8212
SUBJECT: GRB 080906: Refined Swift/UVOT Photometric Redshift
DATE: 08/09/11 14:38:23 GMT
FROM: Stephen Holland at USRA/NASA/GSFC/SSC <Stephen.T.Holland at nasa.gov>
Stephen Holland (CRESST/USRA/GSFC) reports, on behalf of the
Swift/UVOT team:
We have performed UVOT photometry on the optical afterglow of GRB
080906 (Vetere et al., 2008, GCNC 8186) at approximately 6000 s after
the BAT trigger. This data was used to estimate the photometric
redshift of the afterglow assuming a reddened power-law spectrum with
a Lyman cut-off. We find a best-fit value for the photometric
redshift of z = 2.0 +/- 0.4 (90% confidence). Combining this redshift
with the BAT fluence given in Stamatikos et al. (2008, GCNC 8196)
yields a total energy of (8.4 +/- 0.5) x 10^51 erg (90% confidence) in
the observed energy range 15-150 keV. The assumed cosmology is
(H_0,Omega_matter,Omega_lambda) = (70,0.3,0.7).
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