Advanced Light Source April 1997
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D ec 1 99 7 The decay of optical emission from the γ - ray burst GRB 970228
We present the Rc 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 slowing down of the decay of the optical brightness. However, the HST observations in September 1997 show that the light curve of the point source is well represented by a single power law, with a “dip”, about a wee...
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The hard X-ray emission from Cygnus X-1 has been monitored continually by BATSE since the launch of CGRO in April 1991. We present the hard X-ray intensity and spectral history of the source covering a period of more than five years. Power spectral analysis shows a significant peak at the binary orbital period. The 20–100 keV orbital light curve is roughly sinusoidal with a minimum near superio...
متن کاملLong-Term Stability of the APS Storage Ring
The Advanced Photon Source (APS), a third-generation synchrotron light source, was commissioned in 1995 at Argonne National Laboratory and has been fully operational for beamline users since 1997. The APS storage ring can accommodate up to 68 user beamlines (Figure 1); about 70% of the available beamlines are currently in use by various collaborative access teams (CATs). The 7-GeV synchrotron l...
متن کاملDetection of Vhe Gamma-rays from Mrk 501 with the Cat Imaging Telescope
The CAT imaging telescope on the site on the former solar plant Thémis has been observing γ-rays from Mrk501 above 220 GeV in March and April 1997. This source is shown to be highly variable and the light curve is presented. The detected γ-ray rate for the most intense flare is in excess of 10 per minute. INTRODUCTION The CAT imaging telescope was recently built on the site of the former solar ...
متن کاملOrigin of the energy bandgap in epitaxial graphene.
S.Y. Zhou, 2 D.A. Siegel, 2 A.V. Fedorov, F. El Gabaly, A. K. Schmid, A.H. Castro Neto, and A. Lanzara 2 Department of Physics, University of California, Berkeley, CA 94720, USA Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA Department of Physics, Boston Uni...
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تاریخ انتشار 2013