[AAVSO-HEN] GRB 090417B: Galaxy redshift

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html

TITLE:   GCN CIRCULAR
NUMBER:  9156
SUBJECT: GRB 090417B:  Galaxy redshift
DATE:    09/04/18 17:49:52 GMT
FROM:    Edo Berger at Harvard  <eberger at cfa.harvard.edu>

E. Berger (Harvard) and D.B. Fox (PSU) report:

"We obtained spectroscopic observations of the SDSS galaxy located inside
the XRT error circle of GRB 090417B (GCNs 9153, 9155, 9140) with GMOS on
the Gemini-North telescope.  In a combined 1800 sec spectrum we detect
emission lines corresponding to [OII]3727, [OIII]5006, and H-alpha at a
redshift of z=0.345.  At this redshift the observed fluence of the burst
(2.3e-6 erg/cm^2; GCN 9139) translates to an isotropic-equivalent energy
of 9e50 erg."