[vsnet-grb-info 11237] GRB 111209A: IRTF NIR Imaging/Spectroscopy

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  12649
SUBJECT: GRB 111209A: IRTF NIR Imaging/Spectroscopy
DATE:    11/12/10 11:59:38 GMT
FROM:    Myungshin Im at Seoul Nat U  <mim at astro.snu.ac.kr>

Myungshin Im, Hyunsung Jun, and Dohyeong Kim (CEOU/Seoul National Univ)

We observed GRB 111209A (Hoversten et al., GCN 12632) using SpeX
on IRTF. The observation started at 12-09-07:42:13 UT, or about 0.5 hrs 
after the BAT alert. H-band images were taken using a guider camera
revealing a bright NIR counterpart with its flux at H~12 mag.
Note that calibration is done by an observation of a standard star 
next night and needs a further refinement.
NIR spectra were taken at 0.8-2.5 micron with R=750 for 
about 24 min, starting at ~35 min after the BAT alert,
showing good S/N but no obvious features in raw spectra. 
Analysis of the spectral/imaging data is onging.