The relation of the colors of the optical afterglow of GRB030329/SN 2003dh to other afterglows

Šimon, V. and Hudec, R. and Pizzichini, G. (2005) The relation of the colors of the optical afterglow of GRB030329/SN 2003dh to other afterglows. Il nuovo cimento C, 28 (4\5). pp. 545-548. ISSN 1826-9885

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We find that the color indices (B−V )0, (V −R)0, (R−I)0, (I −J)0 in the observer frame of the optical afterglow (OA) of GRB030329 during t−T0 < 10 days are consistent with those of a uniform group of 25 OAs of GRBs (ˇSimon V. et al. A&A 377 (2001) 450; AIP Conf. Proc., 727 (2004) 487). Large color variations of this OA for t − T0 > 12 days are plausibly matched only by those of SN 1998bw although SN 2003dh develops an excess light in the red/IR spectral region. We also emphasize the discordance with other Type-Ic SNe which are not known to be associated with GRBs. The colors thus can help us to resolve the synchrotron component from the contribution of SN and to discriminate between various types of SN (especially important for faint OAs). We also note that the strong concentration of color indices of the ensemble of 26 OAs (including GRB030329) suggests that the local reddening inside their host galaxies is quite similar and relatively small for these events.

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 17:08
Last Modified: 16 Mar 2020 17:08

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