Melandri, A. and Gendre, B. and Antonelli, L. A. and Grazian, A. and de Ugarte Postigo, A. and Gorosabel, J. and Piro, L. and Kosugi, G. and Kaway, N. (2005) Multiwavelength chase of GRB 031220 afterglow. Il nuovo cimento C, 28 (4\5). pp. 537-540. ISSN 1826-9885
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Abstract
Several gamma ray bursts (GRBs) with X-ray afterglow do not show any optical-IR afterglow. The nature of this class of events, the so-called Dark Bursts, is still not clear. The optical absorption could be due to the interstellar dust or to the high redshift of the event. Or, more simply, the non-detection of the optical transient should be due to the delay in the observation or to the rapid energy decaying of these events. High spatial resolution X-ray observations are the most promising tool to investigate on such kind of events. We have collected and analyzed X-ray data and images taken in different spectral bands (optical and infrared) for GRB 031220 and we present the results of the analysis of multiband observations on the field of this burst. Comparison between images taken at different epochs in the same filters did not reveal any strongly variable sources. Photometric analysis and photometric redshift estimation of all possible afterglow candidates suggest that this GRB can be classifie d as a Dark Burst.
| Item Type: | Article |
|---|---|
| Additional Information: | Paper presented at the “4th Workshop on Gamma-Ray Burst in the Afterglow Era”, Rome, October 18-22, 2004. |
| Uncontrolled Keywords: | γ-ray sources; γ-ray bursts ; Astronomical observations ; Image processing |
| Subjects: | 500 Scienze naturali e Matematica > 520 Astronomia e scienze connesse |
| Depositing User: | Marina Spanti |
| Date Deposited: | 16 Mar 2020 17:02 |
| Last Modified: | 16 Mar 2020 17:02 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/15773 |
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