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The decay of optical emission from the Gamma-Ray Burst GRB 970228
Titus J. Galama, Paul J. Groot, Jan van Paradijs +6
We present the R_c band light curve of the optical transient (OT) associated with GRB970228, based on re-evaluation of existing photometry. Data obtained until April 1997 suggested…
A Search for Optical Afterglow from GRB970828
Paul J. Groot, T. Galama, J. van Paradijs +1
We report on the results of R band observations of the error box of the gamma-ray burst of August 28, 1997, made between 4 hours and 8 days after this burst occurred. No counterpar…
Using STIS to find Gamma-Ray Burst Redshifts
Joshua S. Bloom, Steinn Sigurdsson, Ralph A. M. J. Wijers +3
A recent spectrum of the optical afterglow of GRB 970508 suggests that gamma-ray bursts (GRBs) are cosmological in origin and it is of crucial importance to derive an accurate dist…
Testing for Extragalactic Correlations of Gamma-Ray Bursts
Joshua S. Bloom, Nial R. Tanvir, Ralph A. M. J. Wijers
If gamma-ray bursts (GRBs) are cosmological they need not necessarily be spatially coincident with a host galaxy--in many cosmological models the progenitors are ejected to large d…
Calibration of the Fundamental Plane Zero-point in the Leo-I Group and an Estimate of the Hubble Constant
Jens Hjorth, Nial R. Tanvir
We derive new effective radii and total magnitudes for 5 E and S0 galaxies in the Leo-I group from wide-field CCD images. These are used in conjunction with recent literature veloc…