@inproceedings{3da34bee1af24e668a781989bfa9bc86,
title = "Four epochs of VLBA/HSA observations of SN 2001 em",
abstract = "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)kms-1 and for the expansion velocity is 9000kms-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.",
keywords = "VLBA-HSA-VLA, core collapse-type Iln-sn2001em-techniques, image processing-VLBI-instruments, supernova",
author = "Schinzel, {F. K.} and Taylor, {G. B.} and Stockdale, {C. J.} and J. Granot and E. Ramirez-Ruiz",
note = "Copyright: Copyright 2013 Elsevier B.V., All rights reserved.; Santa Fe Conference on Gamma-Ray Bursts 2007, GRB 2007 ; Conference date: 05-11-2007 Through 09-11-2007",
year = "2008",
doi = "10.1063/1.2943520",
language = "אנגלית",
isbn = "9780735405332",
series = "AIP Conference Proceedings",
pages = "509--512",
booktitle = "Gamma-Ray Bursts 2007 - Proceedings of the Santa Fe Conference",
}