The Remarkable Afterglow of GRB 061007 Implications for Optical Flashes and GRB Fireballs.pdf

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The Remarkable Afterglow of GRB 061007 Implications for Optical Flashes and GRB Fireballs.pdf

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The Remarkable Afterglow of GRB 061007 Implications for Optical Flashes and GRB Fireballs

a r X i v : a s t r o - p h / 0 6 1 0 6 6 0 v 2 6 J a n 2 0 0 7 The Remarkable Afterglow of GRB 061007: Implications for Optical Flashes and GRB Fireballs C. G. Mundell1, A. Melandri1, C. Guidorzi1,2,3, S. Kobayashi1, I. A. Steele1, D. Malesani4, L. Amati5, P. D’Avanzo3,6, D. F. Bersier1, A. Gomboc1,7, E. Rol8, M. F. Bode1, D. Carter1, C. J. Mottram1, A. Monfardini1,9, R. J. Smith1, S. Malhotra10, J. Wang11, N. Bannister8, P. T. O’Brien8, N. R. Tanvir8. (cgm)@astro.livjm.ac.uk ABSTRACT We present a multiwavelength analysis of Swift GRB 061007. The 2-m robotic Faulkes Telescope South (FTS) began observing 137 s after the onset of the γ-ray emission, when the optical counterpart was already decaying from R～10.3 mag, and continued observing for the next 5.5 hours. These observations begin during the final γ-ray flare and continue through and beyond a long, soft tail of γ-ray emission whose flux shows an underlying simple power-law decay identical to that seen at optical and X-ray wavelengths, with temporal slope α ～ 1.7 (F ∝ t?α). This remarkably simple decay in all of these bands is rare for Swift bursts, which 1Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Birkenhead, CH41 1LD, UK 2Dipartimento di Fisica, Universita? di Milano-Bicocca, Piazza delle Scienze 3, 20126 Milano, Italy 3INAF-Osservatorio Astronomico di Brera, via Bianchi 46, 23807 Merate (LC), Italy 4International School for Advanced Studies (SISSA-ISAS), via Beirut 2-4, I-34014 Trieste, Italy 5INAF - IASF Bologna, via P. Gobetti 101, Bologna, Italy 6Universita? dell’Insubria, Dipartimento di Fisica e Matematica, via Valleggio 11, I-22100 Como, Italy 7FMF, University in Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia. 8Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK 9CNRS-CTBT, 25 Avenue des Martyrs, 38000 Grenoble, France 10School of Earth and Space Exploration, Arizona State University, P.O. Box 871404, Te