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Radioactive decay of GRB-SNe at late-times

Published online by Cambridge University Press:  17 October 2017

Kuntal Misra  and
A. S. Fruchter
Kuntal Misra
Affiliation:
Aryabhatta Research Institute of observational sciencES, Manora Peak, Nainital India 263 002 email: [email protected]
A. S. Fruchter
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD USA 21210 email: [email protected]
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Abstract

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We present the late-time Hubble Space Telescope observations of two Gamma Ray Burst (GRB) associated supernovae (SNe), GRB 030329/SN 2003dh and XRF 060218/SN 2006aj. Using the multi-color data up to ~320 days after the burst, we constrain the late-time decay nature of these SNe. The decay rates of SN 2003dh are steeper than SN 2006aj. A comparison with two other GRB SNe, GRB 980425/SN 1998bw and the SN associated with XRF 020903, shows that the decay rates of SN 2003dh are similar to XRF 020903 and those of SN 2006aj are similar to SN 1998bw. The late-time decay rates are steeper than the 56Co→56Fe radioactive decay rate indicating that there is some leakage of gamma-rays. We also compare the late-time decay rates of nine type Ic SNe, including the SNe of long GRBs, Ic broad lined and normal Ics. The decay rates of the SNe sample show a remarkable similarity in I band at late-times with a scatter of ~10%.

Keywords

gamma ray bursts(stars:) supernovae: general(stars:) supernovae: individual (SN 2003dh, SN 2006aj)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S331: Supernova 1987A:30 years later - Cosmic Rays and Nuclei from Supernovae and their aftermaths , February 2017 , pp. 45 - 50
Copyright
Copyright © International Astronomical Union 2017 

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