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The Owens Valley Radio Observatory 40 meter telescope is currently monitoringa sample of about 1700 blazars every three days at 15 GHz, with the mainscientific goal of determining the relation between the variability of blazarsat radio and gamma-rays as observed with the Fermi Gamma-ray Space Telescope.The time domain relation between radio and gamma-ray emission, in particularits correlation and time lag, can help us determine the location of thehigh-energy emission site in blazars, a current open question in blazarresearch. To achieve this goal, continuous observation of a large sample ofblazars in a time scale of less than a week is indispensable. Since we onlylook at bright targets, the time available for target observations is mostlylimited by source observability, calibration requirements and slewing of thetelescope. Here I describe the implementation of a practical solution to thisscheduling, calibration, and slewing time minimization problem. This solutioncombines ideas from optimization, in particular the traveling salesman problem,with astronomical and instrumental constraints. A heuristic solution using wellstablished optimization techniques and astronomical insights particular to thissituation, allow us to observe all the sources in the required three dayscadence while obtaining reliable calibration of the radio flux densities.Problems of this nature will only be more common in the future and the ideaspresented here can be relevant for other observing programs.

Scheduling and calibration strategy for continuous radio monitoring of 1700 sources every three days