Early ToO

If there is a ToO to be observed very early in the night, be sure to acquire and download the JSON files from the ToO team (most likely via email, and discussed at the 4pm meeting) early enough that they can be installed on observer1 and checked for accuracy.

Start preparing for the observations soon after sunset. Inform the telescope operator of the plans to start observations early. Instead of performing a zero point at the zenith as usual, observer1 should ask the telescope operator to pick a bright star near the early ToO. Observer1 should provide the TO with the coordinates (in HMS, DMS; not decimal degrees) of the ToO.

Ask the telescope operator to move the telescope to the bright star and do a zero point near the object when the sun is at -10 degrees.

When the sun is at -14 degrees, begin the ToO script. Earlier than that and the background will likely be too high.

Send an email to the ToO team alerting them to the observations. Record the observations in the elog. Since the ToO team is likely ready to look at the data as soon as it is acquired, check the DECam DTS status page ( to make sure the data have begun to be transferred.