Paper:	Implications of Aging in Young Supernovae
Volume:	342, 1604-2004: Supernovae as Cosmological Lighthouses
Page:	430
Authors:	Chandra, P.; Ray, A.
Abstract:	We present here the combined radio spectrum from the Giant Metrewave Radio Telescope and Very Large Array of type IIb SN 1993J (age 11 years) and a type Ic SN 2003bg (age 1 year). In SN 1993J, we find a break in the spectrum at 4 GHz and associate it with Synchrotron cooling break. Hence, we determine the magnetic field independent of equipartition assumption between relativistic electrons and magnetic energy. We also see a hint of break in the spectrum of SN 2003bg between 22-40 GHz. The spectrum of SN 2003bg is well described by the synchrotron self absorption model.

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