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GCN Circular 12649

GRB 111209A: IRTF NIR Imaging/Spectroscopy
2011-12-10T11:59:38Z (13 years ago)
Myungshin Im at Seoul Nat U <>
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.
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