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M31N 2007-11d: A Slowly-Rising, Luminous Nova in M31
A. W. Shafter, A. Rau, R. M. Quimby +4
We report a series of extensive photometric and spectroscopic observations of the luminous M31 nova M31N 2007-11d. Our photometric observations coupled with previous measurements s…
Dark Bursts in the Swift Era: The Palomar 60 inch-Swift Early Optical Afterglow Catalog
S. B. Cenko, J. Kelemen, F. A. Harrison +8
We present multi-color optical observations of long-duration gamma-ray bursts (GRBs) made over a three year period with the robotic Palomar 60 inch telescope (P60). Our sample cons…
The type IIb SN 2008ax: spectral and light curve evolution
A. Pastorello, M. M. Kasliwal, R. M. Crockett +12
We present spectroscopy and photometry of the He-rich supernova (SN) 2008ax. The early-time spectra show prominent P-Cygni H lines, which decrease with time and disappear completel…
The type IIb SN 2008ax: the nature of the progenitor
R. M. Crockett, J. J. Eldridge, S. J. Smartt +9
A source coincident with the position of the type IIb supernova (SN) 2008ax is identified in pre-explosion Hubble Space Telescope (HST) Wide Field Planetary Camera 2 observations i…
An extremely luminous X-ray outburst at the birth of a supernova
A. M. Soderberg, E. Berger, K. L. Page +40
Massive stars end their short lives in spectacular explosions, supernovae, that synthesize new elements and drive galaxy evolution. Throughout history supernovae were discovered ch…
GRB 070201: A possible Soft Gamma Ray Repeater in M31
E. O. Ofek, M. Muno, R. Quimby +13
The gamma-ray burst (GRB) 070201 was a bright short-duration hard-spectrum GRB detected by the Inter-Planetary Network (IPN). Its error quadrilateral, which has an area of 0.124 sq…