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SN 2008iy: An Unusual Type IIn Supernova with an Enduring 400 Day Rise Time
A. A. Miller, J. M. Silverman, N. R. Butler +9
We present spectroscopic and photometric observations of the Type IIn supernova (SN) 2008iy. SN 2008iy showed an unprecedentedly long rise time of ~400 days, making it the first SN…
The long rapid decay phase of the extended emission from the short GRB 080503
Franck Genet, Nathaniel R. Butler, Jonathan Granot
GRB080503 was classified as a short GRB with extended emission (Perley et al. 2009). The origin of such extended emission (found in about a quarter of Swift short GRBs) is still un…
The Cosmic Rate, Luminosity Function and Intrinsic Correlations of Long GRBs
Nathaniel R. Butler, Joshua S. Bloom, Dovi Poznanski
We calculate durations and spectral parameters for 207 Swift bursts detected by the BAT instrument from April 2007 to August 2009, including 67 events with measured redshifts. This…
Limits on Radioactive-Powered Emission Associated With a Short-Hard GRB 070724A in a Star-Forming Galaxy
Daniel Kocevski, Christina C Thone, Enrico Ramirez-Ruiz +10
We present results of an extensive observing campaign of the short duration, hard spectrum gamma-ray burst (GRB) 070724A, aimed at detecting the radioactively-powered emission that…
GRB 090426: The Environment of a Rest-Frame 0.35-second Gamma-Ray Burst at Redshift z=2.609
Emily M. Levesque, Joshua S. Bloom, Nathaniel R. Butler +14
We present the discovery of an absorption-line redshift of z = 2.609 for GRB 090426, establishing the first firm lower limit to a redshift for a gamma-ray burst with an observed du…
The Collimation and Energetics of the Brightest Swift Gamma-Ray Bursts
S. B. Cenko, D. A. Frail, F. A. Harrison +22
Long-duration gamma-ray bursts (GRBs) are widely believed to be highly-collimated explosions (opening angle theta ~ 1-10 deg). As a result of this beaming factor, the true energy r…