2017A&A...607A..29M

Query : 2017A&A...607A..29M

2017A&A...607A..29M - Astronomy and Astrophysics, volume 607A29-29 (2017/11-1)

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., KUIN P., KURODA D., MALESANI D., MUNDELL C.G., NAPPO F., SBARUFATTI B., SMITH R.J., STEELE I.A., TOPINKA M., TROTTER A.S., 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., JELINEK M., KAWAI N., KOBAYASHI S., KOPAC D., LACLUYZE A.P., MARTIN-CARRILLO A., MURPHY D., REICHART D.E., SALVATERRA R., SALAFIA O.S., TAGLIAFERRI G. and VERGANI S.D.

Abstract (from CDS):

Aims. We present a comprehensive temporal and spectral analysis of the long Swift GRB 120327A afterglow data to investigate possible causes of the observed early-time colour variations.
Methods. 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.
Results. The ultraviolet, optical, and near-infrared light curves can be modelled with a single power-law component between 200 and 2x104 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.

Abstract Copyright: © ESO, 2017

Journal keyword(s): gamma-ray burst: individual: GRB 120327A - dust, extinction - dust, extinction

VizieR on-line data: <Available at CDS (J/A+A/607/A29): table2.dat>

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
3 GRB 120327A gB 16 27 27.49 -29 24 53.8           ~ 116 0

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