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- Goddard Space Flight CenterUS884 papers
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61 papers · 1 filter
LOTIS, Super-LOTIS, SDSS and Tautenburg Observations of GRB 010921
H. S. Park, G. G. Williams, D. H. Hartmann +36
We present multi-instrument optical observations of the High Energy Transient Explorer (HETE-2)/Interplanetary Network (IPN) error box of GRB 010921. This event was the first gamma…
The Effect of Changes in the ASCA Calibration on the Fe-Kalpha Lines in Active Galaxies
T. Yaqoob, U. Padmanabhan, T. Dotani +1
The ASCA calibration has evolved considerably since launch and indeed, is still evolving. There have been concerns in the literature that changes in the ASCA calibration have resul…
Initial low/hard state, multiple jet ejections and X-ray/radio correlations during the outburst of XTE J1859+226
C. Brocksopp, R. P. Fender, M. McCollough +8
We have studied the 1999 soft X-ray transient outburst of XTE J1859+226 at radio and X-ray wavelengths. The event was characterised by strong variability in the disc, corona and je…
Limits from CGRO/EGRET Data on the Use of Antimatter as a Power Source by Extraterrestrial Civilizations
Michael J. Harris
I argue that the existence of cold antimatter in bulk is not permitted by the Standard Model, so that if a gamma-ray signature from antiproton annihilation were to be detected, it…
The Detection of Circumnuclear X-ray Emission from the Seyfert Galaxy NGC 3516
I. M. George, T. J. Turner, H. Netzer +7
We present the first high-resolution, X-ray image of the circumnuclear regions of the Seyfert 1 galaxy NGC 3516, using the Chandra X-ray Observatory (CXO). All three of the CXO obs…
Observational Signatures of Black Holes: Spectral and Temporal Features of XTE J1550-564
Lev Titarchuk, Chris Shrader
The theoretical predictions of the converging inflow, or Bulk-Motion Comptonization model are discussed and some predictions are compared to X- and gamma-ray observations of the hi…