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25 papers · 1 filter
An Improved Cluster Richness Estimator
Eduardo Rozo, Eli S. Rykoff, Benjamin P. Koester +11
Minimizing the scatter between cluster mass and accessible observables is an important goal for cluster cosmology. In this work, we introduce a new matched filter richness estimato…
Constraining the Scatter in the Mass-Richness Relation of maxBCG Clusters With Weak Lensing and X-ray Data
Eduardo Rozo, Eli S. Rykoff, August Evrard +10
We measure the logarithmic scatter in mass at fixed richness for clusters in the maxBCG cluster catalog, an optically selected cluster sample drawn from SDSS imaging data. Our meas…
Photometry and spectroscopy of GRB 060526: A detailed study of the afterglow and host galaxy of a z=3.2 gamma-ray burst
C. C. Thöne, D. A. Kann, G. Jóhannesson +58
Aims: With this paper we want to investigate the highly variable afterglow light curve and environment of gamma-ray burst (GRB) 060526 at . Methods: We present one of the…
The L_X--M relation of Clusters of Galaxies
E. S. Rykoff, A. E. Evrard, T. A. McKay +8
We present a new measurement of the scaling relation between X-ray luminosity and total mass for 17,000 galaxy clusters in the maxBCG cluster sample. Stacking sub-samples within fi…
SN 2005ap: A Most Brilliant Explosion
Robert M. Quimby, Greg Aldering, J. Craig Wheeler +3
We present unfiltered photometric observations with ROTSE-III and optical spectroscopic follow-up with the HET and Keck of the most luminous supernova yet identified, SN 2005ap. Th…
Measuring the mean and scatter of the X-ray luminosity -- optical richness relation for maxBCG galaxy clusters
E. S. Rykoff, T. A. McKay, M. R. Becker +6
Determining the scaling relations between galaxy cluster observables requires large samples of uniformly observed clusters. We measure the mean X-ray luminosity--optical richness (…
The Dark Side of ROTSE-III Prompt GRB Observations
S. A. Yost, F. Aharonian, C. W. Akerlof +22
We present several cases of optical observations during gamma-ray bursts (GRBs) which resulted in prompt limits but no detection of optical emission. These limits constrain the pro…
SN 2006bp: Probing the Shock Breakout of a Type II-P Supernova
Robert M. Quimby, J. Craig Wheeler, Peter Höflich +3
HET optical spectroscopy and unfiltered ROTSE-III photometry spanning the first 11 months since explosion of the Type II-P SN 2006bp are presented. Flux limits from the days before…
Swift Observations of the Cooling Accretion Disk of XTE J1817-330
E. S. Rykoff, J. M. Miller, D. Steeghs +1
The black hole candidate X-ray transient XTE J1817-330 was observed by the Swift satellite over 160 days of its 2006 outburst with the XRT and UVOT instruments. At the start of the…
Exploring Broadband GRB Behavior During gamma-ray Emission
S. A. Yost, H. F. Swan, E. S. Rykoff +44
The robotic ROTSE-III telescope network detected prompt optical emission contemporaneous with the gamma-ray emission of Swift events GRB051109A and GRB051111. Both datasets have co…
The Anomalous Early Afterglow of GRB 050801
E. S. Rykoff, V. Mangano, S. A. Yost +24
The ROTSE-IIIc telescope at the H.E.S.S. site, Namibia, obtained the earliest detection of optical emission from a Gamma-Ray Burst (GRB), beginning only 21.8 s from the onset of Sw…
Early-Time Observations of the GRB 050319 Optical Transient
R. M. Quimby, E. S. Rykoff, S. A. Yost +18
We present the unfiltered ROTSE-III light curve of the optical transient associated with GRB 050319 beginning 4 s after the cessation of gamma-ray activity. We fit a power-law func…
Optical Lightcurve & Cooling Break of GRB 050502A
S. A. Yost, K. Alatalo, E. S. Rykoff +29
We present lightcurves of the afterglow of GRB050502A, including very early data at t-t_{GRB} < 60s. The lightcurve is composed of unfiltered ROTSE-IIIb optical observations from 4…
SN 2005cg: Explosion Physics and Circumstellar Interaction of a Normal Type Ia Supernova in a Low-Luminosity Host
Robert Quimby, Peter Hoeflich, Sheila J. Kannappan +5
We present the spectral evolution, light curve, and corresponding interpretation for the "normal-bright" Type Ia Supernova 2005cg discovered by ROTSE-IIIc. The host is a low-lumino…
Prompt Optical Detection of GRB 050401 with ROTSE-IIIa
E. S. Rykoff, S. A. Yost, H. A. Krimm +20
The ROTSE-IIIa telescope at Siding Spring Observatory, Australia, detected prompt optical emission from Swift GRB 050401. In this letter, we present observations of the early optic…
A Search for Untriggered GRB Afterglows with ROTSE-III
E. S. Rykoff, F. Aharonian, C. W. Akerlof +17
We present the results of a search for untriggered gamma-ray burst (GRB) afterglows with the Robotic Optical Transient Search Experiment-III (ROTSE-III) telescope array. This searc…
Northern Sky Variability Survey (NSVS): Public data release
P. R. Wozniak, W. T. Vestrand, C. W. Akerlof +15
The Northern Sky Variability Survey (NSVS) is a temporal record of the sky over the optical magnitude range from 8 to 15.5. It was conducted in the course of the first generation R…
The Early Optical Afterglow of GRB 030418 and Progenitor Mass Loss
E. S. Rykoff, D. A. Smith, P. A. Price +13
The ROTSE-IIIa telescope and the SSO-40 inch telescope, both located at Siding Spring Observatory, imaged the early time afterglow of GRB 030418. In this report we present observat…
ROTSE-III Observations of the Early Afterglow From GRB 030329
D. A. Smith, E. S. Rykoff, C. W. Akerlof +12
Using two identical telescopes at widely separated longitudes, the ROTSE-III network observed decaying emission from the remarkably bright afterglow of GRB 030329. In this report w…
The ROTSE-III Robotic Telescope System
C. W. Akerlof, M. C. B. Ashley, D. E. Casperson +12
The observation of a prompt optical flash from GRB990123 convincingly demonstrated the value of autonomous robotic telescope systems. Pursuing a program of rapid follow-up observat…
An Untriggered Search for Optical Bursts
Robert Kehoe, Carl Akerlof, Richard Balsano +11
We present an untriggered search for optical bursts with the ROTSE-I telephoto array. Observations were taken which monitor an effective 256 square degree field continuously over 1…
The ROTSE-IIIa Telescope System
D. A. Smith, C. Akerlof, M. C. B. Ashley +11
We report on the current operating status of the ROTSE-IIIa telescope, currently undergoing testing at Los Alamos National Laboratories in New Mexico. It will be shipped to Siding…
Discovery of the CV ROTSE3 J015118.59-022300.1
D. A. Smith, C. Akerlof, M. C. B. Ashley +11
We report on the discovery of an outburst from a previously unknown high- latitude CV we designate ROTSE3 J015118.59-022300.1. The object was first detected on 2001 Oct 13.291 at m…
Observations of the Optical Counterpart to XTE J1118+480 During Outburst by the ROTSE-I Telescope
J. Wren, C. Akerlof, R. Balsano +13
The X-ray nova XTE J1118+480 exhibited two outbursts in the early part of 2000. As detected by the Rossi X-ray Timing Explorer (RXTE), the first outburst began in early January and…