Four epochs of VLBA/HSA observations of SN 2001em

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

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Citation (Scopus)


    SN 2001em 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 2 sigma 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 my 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
    Subtitle of host publicationAIP Conference Proceedings
    EditorsM Galassi, D Palmer, E Fenimore
    Place of PublicationMelville
    PublisherAmerican Institute of Physics (AIP)
    Number of pages4
    ISBN (Print)978-0-7354-0533-2
    Publication statusPublished - 2008
    EventGAMMA-RAY BURSTS 2007 - Santa Fe, United States
    Duration: 5 Nov 20079 Nov 2007

    Publication series

    NameAIP Conference Proceedings
    PublisherAmerican Institute of Physics


    ConferenceGAMMA-RAY BURSTS 2007
    Country/TerritoryUnited States
    CitySanta Fe


    • supernova : core collapse
    • type IIn
    • sn2001em
    • techniques : image processing
    • VLBI
    • instruments : VLBA


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