GRB 070311: a direct link between the prompt emission and the afterglow

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dc.creatorGuidorzi, C.
dc.creatorVergani, S. D.
dc.creatorSazonov, S.
dc.creatorCovino, S.
dc.creatorMalesani, D.
dc.creatorMolkov, S.
dc.creatorPalazzi, E.
dc.creatorRomano, P.
dc.creatorCampana, S.
dc.creatorChincarini, G.
dc.creatorFugazza, D.
dc.creatorMoretti, A.
dc.creatorTagliaferri, G.
dc.creatorLlorente, A.
dc.creatorGorosabel, J.
dc.creatorAntonelli, L. A.
dc.creatorCapalbi, M.
dc.creatorCusumano, G.
dc.creatorD'Avanzo, P.
dc.creatorMangano, V.
dc.creatorMasetti, N.
dc.creatorMeurs, E.
dc.creatorMineo, T.
dc.creatorMolinari, E.
dc.creatorMorris, D. C.
dc.creatorNicastro, L.
dc.creatorPage, K. L.
dc.creatorPerri, M.
dc.creatorSbarufatti, B.
dc.creatorStratta, G.
dc.creatorSunyaev, R.
dc.creatorTroja, E.
dc.creatorZerbi, F. M.
dc.date2007-08-10
dc.date.accessioned2026-07-07T08:38:40Z
dc.date.available2026-07-07T08:38:40Z
dc.descriptionWe present prompt gamma-ray, early NIR/optical, late optical and X-ray observations of the peculiar GRB 070311 discovered by INTEGRAL, in order to gain clues on the mechanisms responsible for the prompt gamma-ray pulse as well as for the early and late multi-band afterglow of GRB 070311. We fitted with empirical functions the gamma-ray and optical light curves and scaled the result to the late time X-rays. The H-band light curve taken by REM shows two pulses peaking 80 and 140 s after the peak of the gamma-ray burst and possibly accompanied by a faint gamma-ray tail. Remarkably, the late optical and X-ray afterglow underwent a major rebrightening between 3x10^4 and 2x10^5 s after the burst with an X-ray fluence comparable with that of the prompt emission extrapolated in the same band. Notably, the time profile of the late rebrightening can be described as the combination of a time-rescaled version of the prompt gamma-ray pulse and an underlying power law. This result supports a common origin for both prompt and late X-ray/optical afterglow rebrightening of GRB 070311 within the external shock scenario. The main fireball would be responsible for the prompt emission, while a second shell would produce the rebrightening when impacting the leading blastwave in a refreshed shock (abridged).
dc.description14 pages, 11 figures, 4 tables, accepted to A&A
dc.identifierhttps://arxiv.org/abs/0708.1383
dc.identifierhttp://arxiv.org/abs/0708.1383
dc.identifierAstron.Astrophys. 474 (2007) 793-805
dc.identifierdoi:10.1051/0004-6361:20078254
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/140810
dc.subjectAstrophysics
dc.titleGRB 070311: a direct link between the prompt emission and the afterglow
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