Study of Fast Pulsars Using Continuous Time Tagged Events from the GBM Detectors

Details Study of Fast Pulsars Using Continuous Time Tagged Events from the GBM Detectors Study of Fast Pulsars Using Continuous Time Tagged Events from the GBM Detectors

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21914903b&link_type=abstract

American Astronomical Society, AAS Meeting #219, #149.03

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The time tagged event (TTE) data from the Gamma-ray Burst Monitor (GBM) onboard the Fermi Gamma-ray Space Telescope have excellent time resolution of 2 usec. Untriggered TTE data from the 12 Sodium Iodide (NaI which operate in the gamma-ray energy range: 10-1000 keV) and 2 Bismuth Germanate (BGO which operate in the gamma-ray energy range: 0.15-40 MeV) detectors have been produced since July 2010. These are being generated only within pre-defined boxes in the Fermi orbit, which are designed for the study of Terrestrial Gamma-ray Flashes (TGF). Using these data we obtain pulse profiles for the Crab pulsar by the well known epoch folding technique. The phasogram exhibits both the main and the inter-pulse as expected. Our sensitivity calculations show that we may be able to produce similar pulse profiles for weaker fast pulsars like the Vela pulsar and Geminga using the continuous TTE data. We need to integrate the data over longer ( 106 s) exposure times in order detect weaker signals from these pulsars. This would entail the production of TTE data continuously through out the orbit. The measurement of pulsed fluxes from these pulsars in the GBM energy range will enhance the Science capability of Fermi. In addition, we can also search for untriggered weak GRBs as well as other galactic transients and investigate their location and spectral information.

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