Klotz 2008 GRB 060904B and GRB 070420的早期光学余辉

主要内容:


精彩摘抄:
GRB 060904B 光学和X射线
GRB 070420 光学和X射线 光变曲线

文章信息:

· arXiv e-print (arXiv:0803.0505)

· References in the Article

·

· Translate This Page

Title:		Early emission of rising optical afterglows: The case of GRB 060904B and GRB 070420
Authors:		Klotz, A.; Gendre, B.; Stratta, G.; Galli, A.; Corsi, A.; Preger, B.; Cutini, S.; Pelangeon, A.; Atteia, J. L.; Boer, M.; Piro, L.
Publication:		eprint arXiv:0803.0505
Publication Date:		03/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		11 pages, 5 color figues, 2 b&w figures, accepted for publication by Astronomy and Astrophysics
Bibliographic Code:		2008arXiv0803.0505K

Abstract

We present the time-resolved optical emission of gamma-ray bursts GRB 060904B and GRB 070420 during their prompt and early afterglow phases. We used time resolved photometry from optical data taken by the TAROT telescope and time resolved spectroscopy at high energies from the Swift spacecraft instrument. The optical emissions of both GRBs are found to increase from the end of the prompt phase, passing to a maximum of brightness at t_{peak}=9.2 min and 3.3 min for GRB 060904B and GRB 070420 respectively and then decrease. GRB 060904B presents a large optical plateau and a very large X-ray flare. We argue that the very large X-flare occurring near t_{peak} is produced by an extended internal engine activity and is only a coincidence with the optical emission. GRB 070420 observations would support this idea because there was no X-flare during the optical peak. The nature of the optical plateau of GRB 060904B is less clear and might be related to the late energy injection.

---

Bibtex entry for this abstract Preferred format for this abstract