Four epochs of VLBA/HSA observations of SN 2001 em

F. K. Schinzel, G. B. Taylor, C. J. Stockdale, J. Granot, E. Ramirez-Ruiz

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


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.

Original languageEnglish
Title of host publicationGamma-Ray Bursts 2007 - Proceedings of the Santa Fe Conference
Number of pages4
StatePublished - 2008
Externally publishedYes
EventSanta Fe Conference on Gamma-Ray Bursts 2007, GRB 2007 - Santa Fe, NM, United States
Duration: 5 Nov 20079 Nov 2007

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


ConferenceSanta Fe Conference on Gamma-Ray Bursts 2007, GRB 2007
Country/TerritoryUnited States
CitySanta Fe, NM


  • core collapse-type Iln-sn2001em-techniques
  • image processing-VLBI-instruments
  • supernova


Dive into the research topics of 'Four epochs of VLBA/HSA observations of SN 2001 em'. Together they form a unique fingerprint.

Cite this