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The obscured hyper-energetic GRB 120624B hosted by a luminous compact galaxy at z=2.20
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de Ugarte Postigo, A., Campana, S., Thöne, C. C., D’Avanzo, P., Sánchez-Ramírez, R., Melandri, A., Gorosabel, J., Ghirlanda, G., Veres, P., Martín, S., Petitpas, G., Covino, S., Fynbo, J. P. U. and Levan, Andrew J. (2013) The obscured hyper-energetic GRB 120624B hosted by a luminous compact galaxy at z=2.20. Astronomy & Astrophysics, Volume 557 . Article number L18. doi:10.1051/0004-6361/201322065
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Official URL: http://dx.doi.org/10.1051/0004-6361/201322065
Abstract
Context. Gamma-ray bursts (GRBs) are the most luminous explosions that we can witness in the Universe. Studying the most extreme cases of these phenomena allows us to constrain the limits for the progenitor models.
Aims. In this Letter, we study the prompt emission, afterglow, and host galaxy of GRB 120624B, one of the brightest GRBs detected by Fermi, to derive the energetics of the event and characterise the host galaxy in which it was produced.
Methods. Following the high-energy detection we conducted a multi-wavelength follow-up campaign, including near-infrared imaging from HAWKI/VLT, optical from OSIRIS/GTC, X-ray observations from the Chandra X-ray Observatory and at submillimetre/millimetre wavelengths from SMA. Optical/NIR spectroscopy was performed with X-shooter/VLT.
Results. We detect the X-ray and NIR afterglow of the burst and determine a redshift of z = 2.1974 ± 0.0002 through identification of emission lines of [O ii], [O iii] and H-α from the host galaxy of the GRB. This implies an energy release of Eiso,γ = (3.0 ± 0.2) × 1054 erg, amongst the most luminous ever detected. The observations of the afterglow indicate high obscuration with AV > 1.5. The host galaxy is compact, with R1/2 < 1.6 kpc, but luminous, at L ~ 1.5 L∗ and has a star formation rate of 91 ± 6 M⊙/yr as derived from Hα.
Conclusions. As for other highly obscured GRBs, GRB 120624B is hosted by a luminous galaxy, which we also prove to be compact, with very intense star formation. It is one of the most luminous host galaxies associated with a GRB, showing that the host galaxies of long GRBs are not always blue dwarf galaxies, as previously thought.
| Item Type: | Journal Article | ||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||
| Divisions: | Faculty of Science > Physics | ||||||||
| Library of Congress Subject Headings (LCSH): | Gamma ray bursts | ||||||||
| Journal or Publication Title: | Astronomy & Astrophysics | ||||||||
| Publisher: | EDP Sciences | ||||||||
| ISSN: | 0004-6361 | ||||||||
| Official Date: | September 2013 | ||||||||
| Dates: |
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| Volume: | Volume 557 | ||||||||
| Number of Pages: | 6 | ||||||||
| Article Number: | Article number L18 | ||||||||
| DOI: | 10.1051/0004-6361/201322065 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Description: | Appendix A-D available. |
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| Funder: | Marie Curie Fellowship Association (MCFA), Unidad Asociada, Ikerbasque Basque Foundation for Science, United States. National Aeronautics and Space Administration (NASA), Országos Tudományos Kutatási Alapprogramok (OTKA), Danmarks Grundforskningsfond [Danish National Research Foundation], Agenzia spaziale italiana [Italian Space Agency] (ASI), Italy. Ministero dell'istruzione, dell'università e della ricerca (MIUR) | ||||||||
| Grant number: | AYA2012-39362-C02-02, FP7-PEOPLE-2012-CIG 322307 (MCFA), IAA-CSIC_ETSI-UPV/EHU (UA), NNX13AH50G (NASA), K077795 (OTKA), I/011/07/0 (ASI), 2009ERC3HT (MIUR) |
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