Discovery of the Low-Redshift Afterglow of GRB 011121 and Its Progenitor Supernova 2001ke

Details Discovery of the Low-Redshift Afterglow of GRB 011121 and Its Progenitor Supernova 2001ke Discovery of the Low-Redshift Afterglow of GRB 011121 and Its Progenitor Supernova 2001ke

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.2505g&link_type=abstract

American Astronomical Society, 200th AAS Meeting, #25.05; Bulletin of the American Astronomical Society, Vol. 34, p.677

Astronomy and Astrophysics

Astronomy

Scientific paper

We identify and present the first optical observations of the afterglow of the Gamma-Ray Burst (GRB) 011121. Images were obtained with the OGLE 1.3m telescope in BVRI passbands, starting 10.3;hours after the burst. The temporal analysis of our data indicates a steep decay, independent of wavelength with Fν t{-1.72+/- 0.05}. There is no evidence for a break in the light curve earlier than 2.5 days after the burst. The spectral energy distribution determined from the early broad-band photometry is a power-law with Fν ν {-0.46+/- 0.10} after correcting for a large Galactic extinction. Spectra, obtained with the Magellan 6.5m Baade telescope, reveal narrow emission lines from the host galaxy and these provide a redshift of z=0.36, which is the lowest measured redshift for an optical afterglow. We also present late R and J-band observations of the afterglow ~ 14;days after the burst. The late-time photometry shows a large deviation from the initial decline and our data combined with Hubble Space Telescope photometry provide strong evidence for a supernova peaking less than 10 rest-frame days after the GRB. This is the best evidence to date that classical, long gamma-ray bursts are generated by core-collapse supernovae. This work is partially supported by NASA LTSA grant NAG5-9364.

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