Early emission of rising optical afterglows: the case of GRB 060904B and GRB 070420

A. Klotz; B. Gendre; G. Stratta; A. Galli; A. Corsi; B. Preger; S. Cutini; A. Pélangeon; J. L. Atteia; M. Boër; L. Piro

HAL : hal-00286257, version 1

arXiv : 0803.0505

Code Bibliographique ADS : 2008A&A...483..847K

DOI : 10.1051/0004-6361:20078677

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Early emission of rising optical afterglows: the case of GRB 060904B and GRB 070420
Klotz A., Gendre B., Stratta G., Galli A., Corsi A., Preger B., Cutini S., Pélangeon A., Atteia J.L., Boër M. et al
Astronomy and Astrophysics 483 (2008) 847-855 - http://hal.archives-ouvertes.fr/hal-00286257

Type de publication :

Articles dans des revues avec comité de lecture

Domaine :

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Titre :

Early emission of rising optical afterglows: the case of GRB 060904B and GRB 070420

Auteur(s) :

A. Klotz, B. Gendre, G. Stratta ¹, A. Galli, A. Corsi, B. Preger, S. Cutini, A. Pélangeon ¹, J. L. Atteia ², M. Boër, L. Piro

Laboratoire :

1 :	Laboratoire d'Astrophysique de l'Observatoire Midi-Pyrénées (LATT)

	http://webast.ast.obs-mip.fr

	CNRS : UMR5572 – INSU – Observatoire Midi-Pyrénées – Université Paul Sabatier [UPS] - Toulouse III

	14, avenue Edouard Belin 31400 Toulouse

	France

2 :	Laboratoire Astrophysique de Toulouse-Tarbes (LATT)

	http://webast.ast.obs-mip.fr

	CNRS : UMR5572 – INSU – Observatoire Midi-Pyrénées – Université Paul Sabatier [UPS] - Toulouse III

	14, avenue Edouard Belin 31400 Toulouse

	France

Résumé :

Aims. We present the time-resolved optical emission of gamma-ray bursts GRB 060904B and GRB 070420 during their prompt and early afterglow phases. Methods: 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. Results: 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. Based on observations performed with TAROT at the Calern/OCA and La Silla/ESO observatories, GCN data archive and Swift public data archive.

Langue du texte
intégral :

Anglais

Date de production,
écriture :

04/03/2008

Journal :

Astronomy and Astrophysics (Astron. Astrophys.)
Publisher	EDP Sciences
ISSN	0004-6361 (eISSN : 1432-0756)

Audience :

internationale

Date de publication :

06/2008

Volume :

483

Page, identifiant, ... :

847-855

Mots Clés :

gamma ray : bursts

Commentaire :

11 pages, 5 color figues, 2 b&w figures, accepted for publication by Astronomy and Astrophysics

Lien vers le texte intégral :

http://fr.arXiv.org/abs/0803.0505


hal-00286257, version 1
http://hal.archives-ouvertes.fr/hal-00286257
oai:hal.archives-ouvertes.fr:hal-00286257
Contributeur : Dominique Lullier <>
Soumis le : Lundi 9 Juin 2008, 09:37:15
Dernière modification le : Lundi 9 Juin 2008, 09:37:15