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Title:
Early-Time Photometry and Spectroscopy of the Fast Evolving SN 2006aj Associated with GRB 060218
Authors:
Modjaz, M.; Stanek, K. Z.; Garnavich, P. M.; Berlind, P.; Blondin, S.; Brown, W.; Calkins, M.; Challis, P.; Diamond-Stanic, A. M.; Hao, H.; Hicken, M.; Kirshner, R. P.; Prieto, J. L.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , , , , .), AB(Department of Astronomy, Ohio State University, Columbus, OH 43210; , .), AC(Department of Physics, 225 Nieuwland Science Hall, University of Notre Dame, Notre Dame, IN 46556; .), AD(Smithsonian Institution, Fred Lawrence Whipple Observatory, 670 Mount Hopkins Road, P.O. Box 97, Amado, AZ 85645.), AE(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , , , , .), AF(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , , , , .), AG(Smithsonian Institution, Fred Lawrence Whipple Observatory, 670 Mount Hopkins Road, P.O. Box 97, Amado, AZ 85645.), AH(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , , , , .), AI(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721.), AJ(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , , , , .), AK(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , , , , .), AL(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , , , , .), AM(Department of Astronomy, Ohio State University, Columbus, OH 43210; , .)
Publication:
The Astrophysical Journal, Volume 645, Issue 1, pp. L21-L24. (ApJ Homepage)
Publication Date:
07/2006
Origin:
UCP
ApJ Keywords:
Galaxies: Distances and Redshifts, Gamma Rays: Bursts, Stars: Supernovae: General, supernovae: individual (SN 2006aj)
DOI:
10.1086/505906
Bibliographic Code:
2006ApJ...645L..21M

Abstract

We present early photometric and spectroscopic data on the afterglow of GRB 060218 and report the evolution of the underlying supernova SN 2006aj. Our data span a time range of 4-23 days after the GRB and clearly establish that SN 2006aj is a fast-evolving broad-lined Type Ic SN with an extremely short rise time (~10 days) and a large optical peak luminosity (MV=-18.7 mag). The supernova properties are deduced well since the gamma-ray burst (GRB) afterglow does not contribute a significant amount to the total light output. The spectra show broad lines indicative of large expansion velocities but are better matched by those of SN 2002ap and SN 1997ef (not associated with a GRB) than those of the prototypical GRB-related SN 1998bw. We refine the redshift estimate to z=0.03351+/-0.00007. The host galaxy is a low-metallicity dwarf galaxy (with MV,host=-16.0 mag), similar to host galaxies of other GRB-associated SNe.

Observations reported here were obtained at the MMT Observatory, a joint facility of the Smithsonian Institution and the University of Arizona.

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