Details

Autor(en) / Beteiligte

• Stratta, G
• Gendre, B
• Atteia, J L
• Boer, M
• Coward, D M
• De Pasquale, M
• Howell, E
• Klotz, A
• Oates, S
• Piro, L

Titel

THE ULTRA-LONG GRB 111209A. II. PROMPT TO AFTERGLOW AND AFTERGLOW PROPERTIES

Ist Teil von

• The Astrophysical journal, 2013-12, Vol.779 (1), p.1-14

Ort / Verlag

United States

Erscheinungsjahr

2013

Link zum Volltext

Quelle

Electronic Journals Library

Beschreibungen/Notizen

• In this article we further constrain the phenomenology and progenitor properties of this peculiar GRB by performing a multiband temporal and spectral analysis of both the prompt and the afterglow emission. We use proprietary and publicly available data from Swift, Konus WIND, XMM-Newton, and TAROT, as well as from other ground-based optical and radio telescopes. We find some peculiar properties that are possibly connected to the exceptional nature of this burst, namely: (1) an unprecedented large optical delay of 410 + or - 50 s between the peak time in gamma-rays and the peak time in the optical of a marked multiwavelength flare; (2) multiwavelength prompt emission spectral modeling requires a certain amount of dust in the circumburst environment. (3) we detect the presence of a hard spectral extra power-law component at the end of the X-ray steep steep decay phase and before the start of the X-ray afterglow, which has never been revealed thus far in past GRBs.