[vsnet-grb-info 4233] GRB 070125: Lick 3m Spectroscopy

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6031
SUBJECT: GRB 070125: Lick 3m Spectroscopy 
DATE:    07/01/26 07:29:04 GMT
FROM:    Jason Prochaska at UCO/Lick Obs  <xavier at ucolick.org>

Jason X. Prochaska (UCSC), Ryan Foley (UCB), Daniel Perley (UCB), and
Thea Steele (UCB) on behalf of GRAASP reports:

"We observed the afterglow of GRB 070125 with the Kast
dual spectrometer for 4800s total starting at UT 05:41
under variable conditions.  Our low-resolution
spectrum covers 3400-8000A and reveals no significant absorption
or emission lines.   We place these constraints on the
redshift (in order of descending confidence):

(1) The absence of a Lyman limit implies z<2.7.
(2) The absence of a damped Lya profile or obvious Lya forest
implies z<1.8.
(3) The absence of obvious MgII absorption implies z<0.4.

Further analysis is in progress."


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