[vsnet-grb-info 1994] GRB 050820: High Resolution Spectroscopy from Keck

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3833
SUBJECT: GRB 050820: High Resolution Spectroscopy from Keck
DATE:    05/08/20 09:51:16 GMT
FROM:    Jason Prochaska at UCO/Lick Obs  <xavier at ucolick.org>

--Apple-Mail-126-195385893
Content-Transfer-Encoding: 7bit
Content-Type: text/plain;
	charset=US-ASCII;
	format=flowed

J. X. Prochaska (UCO/Lick), J. S. Bloom, J. T. Wright (UC Berkeley),
R. Paul Butler (DTM, Carnegie), H. W. Chen (MIT), S.S. Vogt (UCO/Lick),
and G.W. Marcy (UC Berkeley) report:

"Starting at 07h28m59s 20 Aug 2005 UTC, we began spectroscopic 
observations
of the optical transient (Fox & Cenko GCN #3829) of GRB 050820
(Page et al. GCN #3830) with HIRES/Keck I. In a series of 900 sec 
exposures
the continuum from the afterglow is well detected as are many absorption
lines.  Based on the identification of a damped Ly alpha feature, SiII 
1304, OI 1302, and numerous fine structure lines we measure the GRB 
redshift to be
z=2.612 +/- 0.002."

We are grateful to Derek Fox for his assistance in helping us acquire 
this data.

This message may be cited.


----------------------------------------------
Jason X. Prochaska
UCO/Lick Observatory
UC Santa Cruz
Santa Cruz, CA 95064

xavier at ucolick.org
http://www.ucolick.org/~xavier/
831-459-2135 (Direct)
831-459-2991 (UCO/Lick Main)
831-459-5244 (Fax)

--Apple-Mail-126-195385893
Content-Transfer-Encoding: 7bit
Content-Type: text/enriched;
	charset=US-ASCII

J. X. Prochaska (UCO/Lick), J. S. Bloom, J. T. Wright (UC Berkeley),

R. Paul Butler (DTM, Carnegie), H. W. Chen (MIT), S.S. Vogt (UCO/Lick),

and G.W. Marcy (UC Berkeley) report:


"Starting at 07h28m59s 20 Aug 2005 UTC, we began spectroscopic
observations

of the optical transient (Fox & Cenko GCN #3829) of GRB 050820

(Page et al. GCN #3830) with HIRES/Keck I. In a series of 900 sec
exposures

the continuum from the afterglow is well detected as are many
absorption

lines.  Based on the identification of a damped Ly alpha feature, SiII
1304, OI 1302, and numerous fine structure lines we measure the GRB
redshift to be 

z=2.612 +/- 0.002."


We are grateful to Derek Fox for his assistance in helping us acquire
this data.


This message may be cited.



<fontfamily><param>Helvetica</param><smaller><smaller>----------------------------------------------

Jason X. Prochaska

UCO/Lick Observatory

UC Santa Cruz

Santa Cruz, CA 95064


xavier at ucolick.org

http://www.ucolick.org/~xavier/

831-459-2135 (Direct)

831-459-2991 (UCO/Lick Main)

831-459-5244 (Fax)

</smaller></smaller></fontfamily>
--Apple-Mail-126-195385893--