Near-infrared detection and optical follow-up of the GRB990705 afterglow

Masetti, N; Palazzi, E; Pian, E; Hunt, LK; Méndez M.; Frontera F.; Amati, L; Vreeswijk, PM; Rol E.; Galama, TJ; van Paradijs, J; Antonelli, LA; Nicastro, L; Feroci M.; Marconi G.; et. al.

Abstract

Optical and near-infrared observations of the GRB990705 error box were carried out with ESO telescopes at La Silla and Paranal in Chile and with the NOAO SPIREX 0.6-meter telescope in Antarctica. We detected the counterpart of this GRB in the near-infrared H band and optical V band. The power-law decline of the near-infrared lightcurve is rather steep with a decay index alpha similar or equal to 1.7 in the first hours, and a possible steepening after one day. Broadband spectral analysis of the optical/near-infrared afterglow suggests that this GRB took place in a high density environment. A deep optical image obtained at Antu (VLT-UT1) about 5 days after the GRB trigger shows at the position of the transient an extended object which might be the host galaxy of GRB990705.

Más información

Título según WOS: Near-infrared detection and optical follow-up of the GRB990705 afterglow
Título según SCOPUS: Near-infrared detection and optical follow-up of the GRB990705 afterglow
Título de la Revista: ASTRONOMY & ASTROPHYSICS
Volumen: 354
Número: 2
Editorial: EDP SCIENCES S A
Fecha de publicación: 2000
Página de inicio: 473
Página final: 479
Idioma: English
Notas: ISI, SCOPUS