Bibcode
DOI
Pedersen, H.; Jaunsen, A. O.; Østensen, R.; Grav, T.; Wold, M.; Lacy, M.; Kristen, H.; Broeils, A.; Castro-Tirado, A. J.; Gorosabel, J.; Rodriguez Espinosa, J. M.; Perez, A. M.; Näslund, M.; Fransson, C.; Andersen, M. I.; Wolf, C.; Fockenbrock, R.; Piro, L.; Feroci, M.; Costa, E.; Nicastro, L.; Palazzi, E.; Frontera, F.; Monaldi, L.; Heise, J.; Hjorth, J.
Bibliographical reference
Fourth Huntsville gamma-ray burst symposium. AIP Conference Proceedings, Volume 428, pp. 530-534 (1998).
Advertised on:
5
1998
Citations
2
Refereed citations
0
Description
Using the Nordic Optical Telescope, La Palma, Spain, optical studies of
OT/GRB970508 were initiated 3 hours 5 minutes after the high energy
event (This appears to be sooner than achieved elsewhere, for any
optical transient). The OT was clearly detected in the earliest images.
The last observation was done August 13-15, i.e. 95-97 days after the
event. We have combined the NOT R and unfiltered data with similar
photometry from elsewhere. We conclude that the observed source
brightness cannot easily be modeled by theories predicting a monotonic
rise to maximum. Also the post-maximum power-law decay, albeit predicted
by several models, is no longer valid at the moment of our last
observation. The contribution of a constant source, mR=25.5
is indicated, but this does not show up in the image profile.