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Calibrated griz magnitudes of Tycho stars: All-sky photometric calibration using bright stars
E. O. Ofek
Photometric calibration to 5% accuracy is frequently needed at arbitrary celestial locations; however, existing all-sky astronomical catalogs do not reach this accuracy and time co…
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…
Pulsations of the Low Mass ZZ Ceti Star HS 1824+6000
Justin D. R. Steinfadt, Lars Bildsten, Eran O. Ofek +1
Measuring g-mode pulsations of isolated white dwarfs can reveal their interior properties to high precision. With a spectroscopic mass of ~0.51 M_{\odot} (log g = 7.82), the DAV wh…
Spectroscopic Confirmation of the Fifth Image of SDSS J1004+4112 and Implications for the M_BH-sigma_* Relation at z=0.68
Naohisa Inada, Masamune Oguri, Emilio E. Falco +5
We present the results of deep spectroscopy for the central region of the cluster lens SDSS J1004+4112 with the Subaru telescope. A secure detection of an emission line of the fain…
SDSS J120923.7+264047: A new massive galaxy cluster with a bright giant arc
Eran O. Ofek, Stella Seitz, Felix Klein
Highly magnified lensed galaxies allow us to probe the morphological and spectroscopic properties of high-redshift stellar systems in great detail. However, such objects are rare,…
SN2007ax : An Extremely Faint Type Ia Supernova
M. M. Kasliwal, E. O. Ofek, A. Gal-Yam +8
We present multi-band photometric and optical spectroscopic observations of SN2007ax, the faintest and reddest Type Ia supernova (SNIa) yet observed. With M_B = -15.9 and (B-V)max…
GALEX Spectroscopy of SN 2005ay suggests a UV spectral uniformity among type II-P supernovae
A. Gal-Yam, F. Bufano, T. Barlow +24
We present the first results from our GALEX program designed to obtain ultraviolet (UV) spectroscopy of nearby core-collapse supernovae (SNe). Our first target, SN 2005ay in the ne…
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 Rate of Type Ia Supernovae at z~0.2 from SDSS-I Overlapping Fields
Assaf Horesh, Dovi Poznanski, Eran O. Ofek +1
In the course of the Sloan Digital Sky Survey (SDSS-I), a large fraction of the surveyed area was observed more than once due to field tiling overlap, usually at different epochs.…
OGLE-2005-BLG-071Lb, the Most Massive M-Dwarf Planetary Companion?
Subo Dong, Andrew Gould, Andrzej Udalski +81
We combine all available information to constrain the nature of OGLE-2005-BLG-071Lb, the second planet discovered by microlensing and the first in a high-magnification event. These…
ULAS J234311.93-005034.0: A gravitational lens system selected from UKIDSS and SDSS
Neal Jackson, Eran O. Ofek, Masamune Oguri
We report the discovery of a new gravitational lens system. This object, ULAS J234311.93-005034.0, is the first to be selected by using the new UKIRT Infrared Deep Sky Survey (UKID…
GRBs 070429B and 070714B: The High End of the Short-Duration Gamma-Ray Burst Redshift Distribution
S. Bradley Cenko, Edo Berger, Ehud Nakar +11
We present optical spectra of the host galaxies of the short-duration gamma-ray burst GRB 070429B and the likely short-duration with extended emission GRB 070714B. In both cases, w…
A comprehensive study of GRB 070125, a most energetic gamma ray burst
Poonam Chandra, S. Bradley Cenko, Dale Frail +21
We present a comprehensive multiwavelength analysis of the bright, long duration gamma-ray burst GRB 070125, comprised of observations in -ray, X-ray, optical, millimeter and ce…
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…
The Third Image of the Large-Separation Lensed Quasar SDSS J1029+2623
Masamune Oguri, Eran O. Ofek, Naohisa Inada +6
We identify a third image in the unique quasar lens SDSS J1029+2623, the second known quasar lens produced by a massive cluster of galaxies. The spectrum of the third image shows s…
Massive stars exploding in a He-rich circumstellar medium. I. Type Ibn (SN 2006jc-like) events
A. Pastorello, S. Mattila, L. Zampieri +26
We present new spectroscopic and photometric data of the type Ibn supernovae 2006jc, 2000er and 2002ao. We discuss the general properties of this recently proposed supernova family…
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…
GRB070125: The First Long-Duration Gamma-Ray Burst in a Halo Environment
S. B. Cenko, D. B. Fox, B. E. Penprase +15
We present the discovery and high signal-to-noise spectroscopic observations of the optical afterglow of the long-duration gamma-ray burst GRB070125. Unlike all previously observed…
The Broad-lined Type Ic SN 2003jd
S. Valenti, S. Benetti, E. Cappellaro +27
The results of a world-wide coordinated observational campaign on the broad-lined Type Ic SN 2003jd are presented. In total, 74 photometric data points and 26 spectra were collecte…
The Environment of M85 optical transient 2006-1: constraints on the progenitor age and mass
E. O. Ofek, S. R. Kulkarni, A. Rau +11
M85 optical transient 2006-1 (M85 OT 2006-1) is the most luminous member of the small family of V838 Mon-like objects, whose nature is still a mystery. This event took place in the…
SDSS J131339.98+515128.3: A new gravitationally lensed quasar selected based on near-infrared excess
E. O. Ofek, M. Oguri, N. Jackson +2
We report the discovery of a new gravitationally lensed quasar, SDSS J131339.98+515128.3, at a redshift of 1.875 with an image separation of 1.24". The lensing galaxy is clearly de…
GRB070610 : A Curious Galactic Transient
M. M. Kasliwal, S. B. Cenko, S. R. Kulkarni +23
GRB 070610 is a typical high-energy event with a duration of 5s.Yet within the burst localization we detect a highly unusual X-ray and optical transient, SwiftJ195509.6+261406. We…
An unusually brilliant transient in the galaxy Messier 85
S. R. Kulkarni, E. O. Ofek, A. Rau +11
Historically, variable and transient sources have both surprised astronomers and provided new views of the heavens. Here we report the discovery of an optical transient in the outs…
GRB 060505: A possible short-duration gamma-ray burst in a star forming region at redshift of 0.09
E. O. Ofek, S. B. Cenko, A. Gal-Yam +26
On 2006 May 5, a four second duration, low energy, ~10^49 erg, Gamma-Ray Burst (GRB) was observed, spatially associated with a z=0.0894 galaxy. Here, we report the discovery of the…