Bibcode
Rossi, A.; de Ugarte Postigo, A.; Ferrero, P.; Kann, D. A.; Klose, S.; Schulze, S.; Greiner, J.; Schady, P.; Filgas, R.; Gonsalves, E. E.; Küpcü Yoldaş, A.; Krühler, T.; Szokoly, G.; Yoldaş, A.; Afonso, P. M. J.; Clemens, C.; Bloom, J. S.; Perley, D. A.; Fynbo, J. P. U.; Castro-Tirado, A. J.; Gorosabel, J.; Kubánek, P.; Updike, A. C.; Hartmann, D. H.; Giuliani, A.; Holland, S. T.; Hanlon, L.; Bremer, M.; French, J.; Melady, G.; García-Hernández, D. A.
Bibliographical reference
Astronomy and Astrophysics, Volume 491, Issue 2, 2008, pp.L29-L32
Advertised on:
11
2008
Journal
Citations
22
Refereed citations
16
Description
The AGILE gamma-ray burst GRB 080514B is the first detected to have
emission above 30 MeV and an optical afterglow. However, no
spectroscopic redshift for this burst is known. We report on our
ground-based optical/NIR and millimeter follow-up observations of this
event at several observatories, including the multi-channel imager GROND
on La Silla, supplemented by Swift UVOT and Swift XRT data. The spectral
energy distribution (SED) of the optical/NIR afterglow is found to
decline sharply bluewards to the UV bands, which can be utilized in
estimating the redshift. Fitting the SED from the Swift UVOT uvw2 band
to the H band, we estimate a photometric redshift of
z=1.8+0.4-0.3, which is consistent with the
reported pseudo-redshift based on gamma-ray data. We find that the
afterglow properties of GRB 080514B do not differ from those exhibited
by the global sample of long bursts. Compared with the long burst
sample, we conclude that this burst was special because of its
high-energy emission properties, even though both its afterglow and host
galaxy are not remarkable in any way. Obviously, high-energy emission in
the gamma-ray band does not automatically correlate with the occurrence
of special features in the corresponding afterglow light.
Appendix A is only available in electronic form at http://www.aanda.org
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