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Deep Photometry of GRB 041006 Afterglow: Hypernova Bump at Redshift z = 0.716

Stanek, K. Z. and Garnavich, P. M. and Nutzman, P. A. and Hartman, J. D. and Garg, A. and Adelberger, K. and Berlind, P. and Bonanos, A. Z. and Calkins, M. L. and Challis, P. and Gaudi, B. S. and Holman, M. J. and Kirshner, R. P. and McLeod, B. A. and Osip, D. and Pimenova, T. and Reiprich, T. H. and Romanishin, W. and Spahr, T. and Tegler, S. C. and Zhao, X. (2005) Deep Photometry of GRB 041006 Afterglow: Hypernova Bump at Redshift z = 0.716. The Astrophysical Journal Letters, 626 (1). L5-L9. ISSN 1538-4357

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Publisher’s or external URL: http://dx.doi.org/10.1086/431361

Abstract

We present deep optical photometry of the afterglow of gamma-ray burst (GRB) 041006 and its associated hypernova obtained over 65 days after detection (55 R-band epochs on 10 different nights). Our early data (t < 4 days) joined with published GCN data indicate a steepening decay, approaching Fν t-0.6 at early times (t 1 day) and Fν t-1.3 at late times. The break at tb = 0.16 ± 0.04 days is the earliest reported jet break among all GRB afterglows. During our first night, we obtained 39 exposures spanning 2.15 hr from 0.62 to 0.71 days after the burst that reveal a smooth afterglow, with an rms deviation of 0.024 mag from the local power-law fit, consistent with photometric errors. After t ~ 4 days, the decay slows considerably, and the light curve remains approximately flat at R ~ 24 mag for a month before decaying by another magnitude to reach R ~ 25 mag 2 months after the burst. This bump is well fit by a k-corrected light curve of supernova SN 1998bw, but only if stretched by a factor of 1.38 in time. In comparison with the other GRB-related SN bumps, GRB 041006 stakes out new parameter space for GRBs/SNe, with a very bright and significantly stretched late-time SN light curve. Within a small sample of fairly well observed GRB/SN bumps, we see a hint of a possible correlation between their peak luminosity and their stretch factor, broadly similar to the well-studied Phillips relation for the Type Ia supernovae.

Item Type: Article
Publisher’s Statement: Copyright 2005. The American Astronomical Society.
ID number or DOI: 10.1086/431361
Keywords: discovery; galaxies : distances and redshifts; gamma-ray burst; gamma rays : bursts; grb-011121; grb-030329; light-curve; optical afterglow; spectrum; supernova 2003dh; supernovae : general
Subjects: Q Science > QB Astronomy
NAU Depositing Author Academic Status: Faculty/Staff
Department/Unit: College of Engineering, Forestry, and Natural Science > Physics and Astronomy
Date Deposited: 28 Mar 2016 21:09
URI: http://openknowledge.nau.edu/id/eprint/1842

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