Four epochs of VLBA/HSA observations of SN 2001 em

Details Four epochs of VLBA/HSA observations of SN 2001 em Four epochs of VLBA/HSA observations of SN 2001 em

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1000..509s&link_type=abstract

GAMMA-RAY BURSTS 2007: Proceedings of the Santa Fe Conference. AIP Conference Proceedings, Volume 1000, pp. 509-512 (2008).

Physics

Gamma-Ray Sources, Gamma-Ray Bursts, Supernova Remnants, Jets And Bursts, Galactic Winds And Fountains

Scientific paper

SN 2001 em is a peculiar supernova (SN) which has been reclassified from Type Ib/c to IIn. We deduced the limits for its proper motion as well as the expansion velocity by analysing four epochs of VLBI observations. Our 2σ upper limit of its proper motion is (23,000+/-30,000) km s-1 and for the expansion velocity is 9000 km s-1 with 95% confidence. Thus we confirm the analysis of Bietenholz & Bartel that this was not a jet-driven gamma ray burst event. The supernova is unresolved 6 years after the explosion. We find no evidence for the existence of a jet. These values suggest interaction of the SN ejecta with a dense circumstellar medium. VLA observations of the flux density over 4 years of observations show a power law decay.

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