Analysis of the late phase of three optical afterglows of GRBs using color indices

Šimon, V. and Hudec, R. and Pizzichini, G. (2005) Analysis of the late phase of three optical afterglows of GRBs using color indices. Il nuovo cimento C, 28 (4\5). pp. 549-552. ISSN 1826-9885

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We find that although the absolute magnitude of the optical afterglow (OA) of GRB011121 in the late phase (t − T0 > 10 days) is approximately consistent with that of the SN 1998bw-type supernova SN 2001ke, previously found by Garnavich P. M. et al. (ApJ, 582 (2003) 924), a good match of their colors occurs only for t − T0 = 13–23 days in the observer frame of GRB011121. We are able to constrain the possible SN in the OA of GRB010222 to be of the peculiar SN 1998bw or SN 2002ap type, but not of SNe classified as Type Ic in the database of Poznanski D. et al. (PASP, 114 (2002) 833). Neither colors nor absolute magnitude of the OA of GRB970508 in the late phase are consistent with those of any of the above-mentioned (sub)types of SN. These results imply that the bumps in the late phase of the OAs can be caused by several mechanisms. Color indices thus appear to be a powerful tool in the analysis of these phenomena, even for archival data of OAs.

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 ; Supernovae ; Radiation mechanisms; polarization ; Visible (390–750 nm)
Subjects: 500 Scienze naturali e Matematica > 520 Astronomia e scienze connesse
Depositing User: Marina Spanti
Date Deposited: 16 Mar 2020 17:09
Last Modified: 16 Mar 2020 17:09

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