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Explaining the Gamma-Ray Burst E_peak Distribution
Bradley E. Schaefer
The characteristic photon energy for Gamma Ray Bursts, E_peak, has a remarkably narrow distribution for bursts of similar peak flux, with values between 150 and 600 keV for most fa…
Gamma-Ray Burst Hubble Diagram to z=4.5
Bradley E. Schaefer
Gamma-ray bursts (GRBs) are tremendous explosions visible across most of the Universe, certainly out to redshifts of z=4.5 and likely out to z~10. Recently, GRBs have been found to…
GRB 021004: a Massive Progenitor Star Surrounded by Shells
Bradley E. Schaefer, C. L. Gerardy, P. Hoflich +13
We present spectra of the optical transient of GRB021004 obtained with the Hobby-Eberly telescope starting 15.48, 20.31 hours, and 4.84 days after the burst and a spectrum obtained…
The Shape of Nereid's Phase Function Changed From 1998 To 1999 and 2000
Bradley E. Schaefer, Suzanne W. Tourtellotte
We present well-sampled light curves of Nereid for 1999 and 2000 which show symmetric shapes centered on opposition as is characteristic of a large opposition surge. Surprisingly,…
Photometric Light Curve for the Kuiper Belt Object 2000 EB173 on 78 Nights
Bradley E. Schaefer, David L. Rabinowitz
Kuiper Belt Objects (KBOs) are generally very faint and cannot in practice be monitored with a well-sampled long-term light curve; so our discovery of the bright KBO 2000 EB173 off…
An HST study of three very faint GRB host galaxies
A. O. Jaunsen, M. I. Andersen, J. Hjorth +8
As part of the HST/STIS GRB host survey program we present the detection of three faint gamma-ray burst (GRB) host galaxies based on an accurate localisation using ground-based dat…
A Large Area CCD Camera for the Schmidt Telescope at the Venezuelan National Astronomical Observatory
C. Baltay, J. A. Snyder, P. Andrews +25
We have designed, constructed and put into operation a large area CCD camera that covers a large fraction of the image plane of the 1 meter Schmidt telescope at Llano del Hato in V…