Quaestor

Covino, Ralph

doi:10.1002/9781444338386.wbeah20111

Cited by 1 publication

(1 citation statement)

References 5 publications

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“…Optical and NIR magnitudes, not corrected for the Galactic reddening E B−V = 0.29 (Schlafly & Finkbeiner 2011), are reported in Table 2 (Online Material). These data supersede those published in Kuin et al (2012), Covino et al (2012), Gorosabel et al (2012), LaClyuze et al (2012, Meehan et al (2012), Im et al (2012), Cobb (2012), Kuroda et al (2012a,b) and Smith & Virgili (2012). We also used in our analysis data from Sudilovsky et al (2012).…”

Section: Observationssupporting

confidence: 66%

Colour variations in the GRB 120327A afterglow

Melandri

Covino

Zaninoni

et al. 2017

A&A

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Aims. We present a comprehensive temporal and spectral analysis of the long Swift GRB 120327A afterglow data to investigate the possible causes of the observed early time colour variations. Methods. We collected data from various instruments/telescopes in different bands (X-rays, ultra-violet, optical and near-infrared) 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 ultra-violet, optical, and near-infrared light curves can be modelled with a single power-law component between 200 and 2 × 10 4 s after the burst event. The X-ray light curve shows a canonical steep-shallow-steep behaviour, typical of long gamma-ray bursts. At early times a colour variation is observed in the ultra-violet/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.

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Section: Observationssupporting

confidence: 66%