The Swift Burst Alert Telescope (BAT) hard X-ray transient monitor tracks more than 700 galactic and extragalactic sources on time scales ranging from a single Swift pointing (approximately 20 minutes) to one day. The monitored sources include all objects from the Fermi LAT bright source list which are either identified or which have a 95% error confidence radius of less than eight arc minutes. We report on the detection statistics of these sources in the BAT monitor both before and after the launch of Fermi.
@article{arxiv.0912.3498,
title = {Swift/BAT monitoring of Fermi/LAT sources},
author = {Hans A. Krimm and Scott D. Barthelmy and Neil Gehrels and Jack Tueller and Wayne H. Baumgartner and Jay R. Cummings and Taka Sakamoto and Edward E. Fenimore and David M. Palmer and Craig B. Markwardt and Gerald K. Skinner and Michael Stamatikos},
journal= {arXiv preprint arXiv:0912.3498},
year = {2009}
}