[vsnet-grb-info 5164] GRB 071010: Keck/LRIS Spectroscopy
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Wed Oct 10 16:56:45 JST 2007
TITLE: GCN CIRCULAR
NUMBER: 6864
SUBJECT: GRB 071010: Keck/LRIS Spectroscopy
DATE: 07/10/10 07:56:39 GMT
FROM: Jason Prochaska at UCO/Lick Obs <xavier at ucolick.org>
Jason X. Prochaska (UCSC), D. A. Perley, M. Modjaz, J.S. Bloom,
D. Poznanski (UC Berkeley), H.-W. Chen (U Chicago), report on behalf
of GRAASP:
"We observed the afterglow of GRB 071010 with the LRIS
dual spectrometer for a series of 900s exposures starting
at UT 05:00 under good conditions. Analysis of the blue side
reveals a strong MgII absorber and corresponding FeII lines
at z=0.98. The absence of strong features in the spectrum
redward of 5700A suggests this is the redshift of
the GRB. A more conservative upper limit is placed by
the absence of IGM signatures at 3400A which
indicates z_GRB < 1.8.
Further analysis is in progress."
This GCN may be cited.
More information about the vsnet-grb-info
mailing list