[AAVSO-HEN] GRB 090621B: Gemini spectrum of afterglow candidate

[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:  9559
SUBJECT: GRB 090621B: Gemini spectrum of afterglow candidate
DATE:    09/06/22 19:42:32 GMT
FROM:    Edo Berger at Harvard  <eberger at cfa.harvard.edu>

E. Berger (Harvard), A. Cucchiara, D.B. Fox (Penn State), and A.J. Levan 
(U. Warwick) report:

"On 2009 June 22.41 UT we used the GMOS instrument mounted on the 
Gemini-North 8-m telescope to obtain spectroscopic observations of the 
candidate optical afterglow (GCN #9547) of the short GRB 090621B (GCN 
#9545).  A pair of 1800 sec exposures were obtained with a wavelength 
coverage of 4500-7500A.  The combined spectrum of the source reveals 
broad features typical of an early M dwarf star.  We therefore conclude 
that this object is unrelated to the GRB."