The variable X-ray light curve of GRB 050713A: The case of refreshed shocks

D. Guetta, F. Fiore, V. D'Elia, R. Perna, L. A. Antonelli, S. Piranomonte, S. Puccetti, L. Stella, L. Angelini, N. Schartel, S. Campana, G. Chincarini, S. Covino, G. Tagliaferri, D. Malesani, C. Guidorzi, A. Monfardini, C. G. Mundell, J. De León Cruz, A. J. Castro-TiradoS. Guzly, J. Gorosabel, M. Jelinek, A. Gomboc

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

We present a detailed study of the spectral and temporal properties of the X-ray and optical emission of GRB050713a up to 0.5 day after the main Gamma Ray Burst (GRB) event. The X-ray light curve exhibits large amplitude variations with several rebrightenings superposed on the underlying three-segment broken power-law that is often seen in Swift GRBs. Our time-resolved spectral analysis supports the interpretation of a long-lived central engine, with rebrightenings consistent with energy injection in refreshed shocks as slower shells generated in the central engine prompt phase catch up with the afterglow shock at later times. Our sparsely sampled light curve of the optical afterglow can be fitted with a single power-law without large flares. The optical decay index appears flatter than the X-ray one, especially at later times.

Original languageEnglish
Pages (from-to)95-101
Number of pages7
JournalAstronomy and Astrophysics
Volume461
Issue number1
Early online date27 Sep 2006
DOIs
Publication statusPublished - 1 Jan 2007

Keywords

  • Gamma ray: bursts
  • X-ray: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Guetta, D., Fiore, F., D'Elia, V., Perna, R., Antonelli, L. A., Piranomonte, S., ... Gomboc, A. (2007). The variable X-ray light curve of GRB 050713A: The case of refreshed shocks. Astronomy and Astrophysics, 461(1), 95-101. https://doi.org/10.1051/0004-6361:20065038