IAA authors:
Castro-Tirado A.J.;Sánchez E.
Authors:
Castro-Tirado A.J., Gorosabel J., Davies J., Leggett S., Greiner J., Birkle K., Thompson D., Hagen H.-J., Trapero J., Sánchez E., Campos A., Metcalfe N., Béjar V., Cairós L.M., Corradi R., Guerrero M., Gutiérrez C., Iglesias J., Kemp S., Licandro J., Mora A., Oscoz A., Sabalisk N., Vílchez J., Villaver E., Zapatero-Osorio M.R., Guziy S., Shlyapnikov A., Pedersen H.
Journal:
Astrophysical Letters and Communications
Abstract:
Optical/IR follow-up observations have been performed for GRB 970616, GRB 970815, GRB 970828 and GRB 980703. With the exception on GRB 980703, no optical/IR counterparts have been found. In the case of GRB 970828, the absence of the optical/IR afterglow, together with the rather high hydrogen column density towards the source, at a high galactic latitude, indicates an intrinsic absorption. For GRB 980703, a fading optical/IR object was detected, and further imagery revealed the GRB host galaxy, the brightest so far detected. These results would support the existence of a dense and rich-gas medium in which the GRBs occurred, thus linking these events to star forming regions, favouring the hypernova model scenarios. © 1999 OPA (Overseas Publishers Association) N.V. Published by license under the Gordon and Breach Science Publishers imprint.