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SN 1997cy/GRB 970514: A New Piece in the Gamma-Ray Burst Puzzle?

Germany, Lisa, Reiss, David J, Sadler, Elaine M, Schmidt, Brian P and Stubbs, Christopher (2000) SN 1997cy/GRB 970514: A New Piece in the Gamma-Ray Burst Puzzle? The Astrophysical Journal, 533 (1). pp. 320-328. ISSN 0004-637X (print) 1538-4357 (online)

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We present observations of SN 1997cy, a supernova (SN) discovered as part of the Mount Stromlo Abell Cluster SN Search (Reiss et al.), which does not easily fit into the traditional classification scheme for supernovae. This object's extraordinary optical properties and coincidence with GRB 970514, a short duration gamma-ray burst (GRB), suggest a second case, after SN 1998bw/GRB 980425, for a SN-GRB association. SN 1997cy is among the most luminous SNe yet discovered (MR ll -20.1, H0 = 65) and has a peculiar spectrum. We present evidence that SN 1997cy ejected approximately 2.6 M☉ of 56Ni, supported by its late-time light curve and Fe II/[Fe III] lines in its spectrum, although it is possible that both these observations can be explained via circumstellar interaction. While SN 1998bw and SN 1997cy appear to be very different objects with respect to both their gamma-ray and optical properties, SN 1997cy and the optical transient associated with GRB 970508 have roughly similar late-time optical behavior. This similarity may indicate that the late-time optical output of these two intrinsically bright transient events have a common physical process. Although the connection between GRB 970514 and SN 1997cy is suggestive, it is not conclusive. However, if this association is real, follow-up of short duration GRBs detected with BATSE or HETE2 should reveal objects similar to SN 1997cy.

Item Type: Article
Uncontrolled Keywords: gamma rays, bursts, supernovae, images, stars, galaxies, magnitudes, luminosity, photometric observations, photometry, spectra, light curve, GRB 970514, telescopes, Mount Stromlo Abell Cluster Supernova search, MSSSO, Australia
Subjects: Current > FOR Classification > 0201 Astronomical and Space Sciences
Current > Division/Research > Other
Depositing User: Ms Julie Gardner
Date Deposited: 25 Jun 2014 03:41
Last Modified: 25 Jun 2014 04:47
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Citations in Scopus: 90 - View on Scopus

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