S. B. Cenko, J. S. Bloom, D. A. Perley, B. E. Cobb, A. N. Morgan, and A.
A. Miller, Maryam Modjaz (UC Berkeley) and B. James (DARK) report on
behalf of a larger collaboration:
We have obtained spectra of the likely host galaxy (Miller et al., GCN
10377) and afterglow (Levan et al., GCN 10386) of the short-hard
GRB100206A (Krimm et al, GCN 10376) with the Low Resolution Imaging
Spectrometer mounted on the 10-m Keck I telescope. Observations began at
06:17 UT on 7 February (~ 16.8 hours after the burst) and cover the
wavelength range from approximately 3500 - 10000 A.
At the location of the candidate host galaxy, we detect a strongly red
continuum consistent with the published photometry (Leloudas et al., GCN
10387). We detect strong, clearly resolved emission lines from H-alpha
and [NII] at a redshift of z = 0.41. No other obvious lines are visible
over spectral range in our preliminary reduction. The lack of H-beta,
coupled with the red spectrum and colors, suggest a relatively dusty
environment. At this redshift, the projected offset of ~ 6.8" from the
candidate afterglow corresponds to a distance of ~ 35 kpc.
No obvious trace is visible at the location of the afterglow.
Observations and reduction are ongoing.