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A Search for Short Time-Scale Optical Variability in the GRB 030329 Afterglow
N. Mirabal, J. P. Halpern, M. Bureau +1
We present a densely sampled R-band light curve of the optical afterglow of GRB 030329 obtained during the period 15.5-23 hours after the burst. This dataset allows us to search fo…
GRB 021004: A Possible Shell Nebula around a Wolf-Rayet Star Gamma-Ray Burst Progenitor
N. Mirabal, J. P. Halpern, R. Chornock +2
The rapid localization of GRB 021004 by the HETE-2 satellite allowed nearly continuous monitoring of its early optical afterglow decay, as well as high-quality optical spectra that…
Was the X-ray Afterglow of GRB 970815 Detected?
N. Mirabal, J. P. Halpern, E. V. Gotthelf +1
GRB 970815 was a well-localized gamma-ray burst (GRB) detected by the All-Sky Monitor (ASM) on the Rossi X-Ray Timing Explorer (RXTE) for which no afterglow was identified despite…
A Redshift Determination for XRF 020903: First Spectroscopic Observations of an X-Ray Flash
A. M. Soderberg, S. R. Kulkarni, E. Berger +10
We report the discovery of optical and radio afterglow emission from the extremely soft X-ray flash, XRF 020903. Our spectroscopic observations provide the first redshift for an X-…
Long Term Profile Variability of Double-Peaked Emission Lines in AGNs
Karen T. Lewis, Michael Eracleous, Jules P. Halpern +1
An increasing number of AGNs exhibit broad, double-peaked Balmer emission lines, which are thought to arise from the outer regions of the accretion disk which fuels the AGN. The li…
Accurate Redshifts and Classifications for 110 Radio-Loud AGNs
Michael Eracleous, Jules P. Halpern
We report accurate redshifts of 110 active galaxies (mostly radio-loud objects at z<0.4) observed in the course of a survey to find broad, double-peaked emission lines. These redsh…