A ``Snapshot'' Survey of the Gamma Ray Sky at GeV Energies
W. T. Vestrand
The giant outbursts of GeV emission observed from some blazars pose a
significant challenge to our understanding of blazar emission
mechanisms. Unfortunately, the giant outbursts of GeV emission from
blazars are not always predictable from monitoring observations in other energy
bands. We discuss a new strategy to search the sky for intense
outbursts of GeV emission that we will implement during Cycle 9 of the
CGRO observing program. The new strategy employs 1-day activation of
the EGRET spark chamber to take a ``snapshot'' of the sky at the
beginning of each Viewing Period for which the satellite Z-axis is
pointing toward high galactic latitude. We show that tests on
recent EGRET data indicate that a 1-day snapshot can unambiguously
detect bursts out to nearly 15° from the CGRO pointing
direction when the > 100 MeV flux exceeds 10-6 cm-2s-1. If
a major outburst is detected, a follow-up multiwavelength campaign
will be conducted to follow the burst development.
File translated from TEX by TTH, version 2.32.
On 3 Aug 1999, 10:41.