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The Astrophysical Journal


We present millimeter and submillimeter wavelength observations and near-infrared K -band imaging toward the bright gamma-ray burst GRB 010222. Over seven epochs the flux density of the source was constant wit h an average flux density 3.74 ± 0.53 mJy at 350 GHz and 1.05 ± 0.22 mJy at 250 GHz, giving a spectral index α = 3 . 78 ± 0.25 (where F∝ να). We rule out the possibility that this emission originated from the burst or its afterglow and we conclu de that it is due to a dusty, high redshift starburst galaxy (SMM J14522+43 01). We argue that the host galaxy of GRB 010222 is the most plausible count erpart of SMM J14522+4301, based in part on the centimeter detection of th e host at the expected level. The optical/NIR properties of the host galaxy of GR B 010222 suggest that it is a blue, sub-L, similar to other GRB host galaxies. This contrasts with the enormous far-infrared luminosity of this galaxy based on our submillimeter detection (LBol ≈ 4 × 1012L). We suggest that this GRB host galaxy has a very high star formation rate, SFR ≈ 600 M yr−1, most of which is unseen at optical wavelengths.