Colour variations in the GRB 120327A afterglow

Melandri, A.; Covino, S.; Zaninoni, E.; Campana, S.; Bolmer, J.; Cobb, B. E.; Gorosabel, J.; Kim, J.W.; Kuindersma, S.; Kuroda, D.; Malesani, D.; Mundell, C. G.; Nappo, F.; Sbarufatti, B.; Smith, R. J.; Steele, I.A.; Topinka, M.; Trotter, G.; Virgili, F. J.; Bernardini, M. G.; D'Avanzo, P.; D'Elia, V.; Fugazza, D.; Ghirlanda, G.; Gomboc, A.; Greiner, J.; Guidorzi, C.; Haislip, J.B.; Hanayama, H.; Hanlon, L.; Im, M.; Ivarsen, K.M.; Japelj, J.; Jelínek, Martin; Kawai, N.; Kobayashi, S.; Kopac, D.; LaCluyze, A.; Martin-Carrillo, A.; Murphy, D.; Reichart, D. E.; Salvaterra, R.; Salafia, O. S.; Tagliaferri, G.; Vergani, S. D.

doi:https://dx.doi.org/10.1051/0004-6361/201731759

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Colour variations in the GRB 120327A afterglow

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SYSNO ASEP	0485446
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Colour variations in the GRB 120327A afterglow
Author(s)	Melandri, A. (IT) Covino, S. (IT) Zaninoni, E. (BR) Campana, S. (IT) Bolmer, J. (DE) Cobb, B. E. (US) Gorosabel, J. (US) Kim, J.W. (KR) Kuindersma, S. (NL) Kuroda, D. (JP) Malesani, D. (IT) Mundell, C. G. (GB) Nappo, F. (IT) Sbarufatti, B. (US) Smith, R. J. (GB) Steele, I.A. (GB) Topinka, M. (IE) Trotter, G. (FR) Virgili, F. J. (GB) Bernardini, M. G. (FR) D'Avanzo, P. (IT) D'Elia, V. (IT) Fugazza, D. (IT) Ghirlanda, G. (IT) Gomboc, A. (SI) Greiner, J. (DE) Guidorzi, C. (IT) Haislip, J.B. (US) Hanayama, H. (JP) Hanlon, L. (IE) Im, M. (KR) Ivarsen, K.M. (US) Japelj, J. (SI) Jelínek, Martin (ASU-R)_ORCID Kawai, N. (JP) Kobayashi, S. (JP) Kopac, D. (SI) LaCluyze, A. (US) Martin-Carrillo, A. (IE) Murphy, D. (IE) Reichart, D. E. (US) Salvaterra, R. (IT) Salafia, O. S. (IT) Tagliaferri, G. (IT) Vergani, S. D. (KR)
Number of authors	45
Source Title	Astronomy & Astrophysics. - : EDP Sciences - ISSN 0004-6361 Roč. 607, October (2017), A29/1-A29/5
Number of pages	5 s.
Publication form	Online - E
Language	eng - English
Country	FR - France
Keywords	gamma-ray burst ; time-dependent photoionization ; early optical afterglow
Subject RIV	BN - Astronomy, Celestial Mechanics, Astrophysics
OECD category	Astronomy (including astrophysics,space science)
Institutional support	ASU-R - RVO:67985815
UT WOS	000414181400011
EID SCOPUS	85032641680
DOI	10.1051/0004-6361/201731759
Annotation	We present a comprehensive temporal and spectral analysis of the long Swift GRB120327A afterglow data to investigate possible causes of the observed early-time colour variations. We collected data from various instruments and telescopes in X-ray, ultraviolet, optical, and near-infrared bands, and determined the shapes of the afterglow early-time light curves. We studied the overall temporal behaviour and the spectral energy distributions from early to late times. The ultraviolet, optical, and near-infrared light curves can be modelled with a single power-law component between 200 and 2 x 10(4) s after the burst event. The X-ray light curve shows a canonical steep-shallow-steep behaviour that is typical of long gamma-ray bursts. At early times a colour variation is observed in the ultraviolet/optical bands, while at very late times a hint of a re-brightening is visible. The observed early-time colour change can be explained as a variation in the intrinsic optical spectral index, rather than an evolution of the optical extinction.
Workplace	Astronomical Institute
Contact	Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326
Year of Publishing	2018

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