Testing gamma-ray burst models with the afterglow of GRB 090102

B. Gendre, A. Klotz, E. Palazzi, T. Kruehler, S. Covino, P. Afonso, L. A. Antonelli, J. L. Atteia, P. D'Avanzo, M. Boer, J. Greiner, S. Klose

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

We present the observations of the afterglow of gamma-ray burst GRB 090102. Optical data taken by the Telescope a Action Rapide pour les Objets Transitoires (TAROT), Rapid Eye Mount (REM), Gamma-Ray burst Optical/Near-Infrared Detector (GROND), together with publicly available data from Palomar, Instituto de Astrofisica de Canarias (IAC) and Nordic Optical Telescope (NOT) telescopes, and X-ray data taken by the XRT instrument on board the Swift spacecraft were used. This event features an unusual light curve. In X-rays, it presents a constant decrease with no hint of temporal break from 0.005 to 6 d after the burst. In the optical, the light curve presents a flattening after 1 ks. Before this break, the optical light curve is steeper than that of the X-ray. In the optical, no further break is observed up to 10 d after the burst. We failed to explain these observations in light of the standard fireball model. Several other models, including the cannonball model were investigated. The explanation of the broad-band data by any model requires some fine-tuning when taking into account both optical and X-ray bands.

Original languageEnglish
Pages (from-to)2372-2380
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume405
Issue number4
DOIs
Publication statusPublished - 11 Jul 2010
Externally publishedYes

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