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Severe Limits on Variations of the Speed of Light with Frequency
Bradley E. Schaefer
Explosive astrophysical events at high red shift can be used to place severe limits on the fractional variation in the speed of light (), the photon mass (), and the ene…
Severe New Limits on the Host Galaxies of Gamma Ray Bursts
Bradley E. Schaefer
The nature of Gamma Ray Bursts (GRBs) remains a complete mystery, despite the recent breakthrough discovery of low energy counterparts, although it is now generally believed that a…
Gamma Ray Bursts Have Millisecond Variability
Katharine C. Walker, Bradley E. Schaefer, E. E. Fenimore
We have performed searches for isolated flares and for steady flickering in Gamma Ray Burst light curves on the microsecond to millisecond time scales. Two bursts out of our sample…
A Gamma Ray Burst with a 220 Microsecond Rise Time and a Sharp Spectral Cutoff
Bradley E. Schaefer, Katharine C. Walker
The Gamma Ray Burst GRB920229 has four extreme and unprecedented properties; a rise in brightness with an e-folding time scale of , a fall in brightness with an e-fo…
The Peak Brightness of SN1974G in NGC4414 and the Hubble Constant
Bradley E. Schaefer
The light curve of the Type Ia supernova SN1974G (in NGC4414) is important because the Hubble Space Telescope has measured the distance to the host galaxy by means of Cepheid varia…
Time Dilation in the Peak-to-Peak Time Scale of GRBs
Ming Deng, Bradley E. Schaefer
We present strong evidence of time stretching in the peak-to-peak time scales in the light curves of BATSE Gamma Ray Bursts (GRBs). Extensive tests are performed on artificially di…