All-Sky Earth Occultation Observations with the Fermi Gamma Ray Burst Monitor

Details All-Sky Earth Occultation Observations with the Fermi Gamma Ray Burst Monitor All-Sky Earth Occultation Observations with the Fermi Gamma Ray Burst Monitor

2009-12-18

arxiv.org/abs/0912.3831v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

2009 Fermi Symposium, eConf Proceedings C091122 6 pages, 9 Figures

Scientific paper

Using the Gamma Ray Burst Monitor (GBM) on-board Fermi, we are monitoring the hard X-ray/soft gamma ray sky using the Earth occultation technique. Each time a source in our catalog enters or exits occultation by the Earth, we measure its flux using the change in count rates due to the occultation. Currently we are using CTIME data with 8 energy channels spanning 8 keV to 1 MeV for the GBM NaI detectors and spanning 150 keV to 40 MeV for the GBM BGO detectors. Our preliminary catalog consists of galactic X-ray binaries, the Crab Nebula, and active galactic nuclei. In addition, to Earth occultations, we have observed numerous occultations with Fermi's solar panels. We will present early results. Regularly updated results can be found on our website http://gammaray.nsstc.nasa.gov/gbm/science/occultation

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