SALT Calibration Plan

○ will be produced for every observable night
○ will be produced without PI request
○ PI will not be charged
○ will be done during day or morning time, possibly twilight and nighttime

○ will be produced at some regular interval, not every observable night
○ will be produced without PI request
○ PI will not be charged
○ will be done during day-time, possibly twilight and nighttime

○ will be produced by PI request
○ will be done during nighttime
○ PI will be charged

○ will be produced by PI request
○ will be done during daytime and/or twilight
○ PI will not be charged

○ 5 screen flats per detector and camera setup
○ 11 biases per detector setup

i. Observations of any reference arc spectra before/in between/after science observations. For each reference arc spectrum the PI will be charged approximately 120 sec because of the time it takes to configure the calibration system and the integration time required to obtain a good arc spectrum (often 60 sec). For increased efficiency, we recommend the arc observation to occur after the science. Arcs are normally taken for every program.
ii. Observations of 5 spectral flats before/in between/after science observations. For each set of 5 spectral flats the PI will be charged approximately 120 sec, which includes the setup, integrations and readouts. We recommend spectral flats be taken after science for efficiency. For clarity, we ask that the PI clearly mentions in both phase-1 and phase-2 whether or not flats are needed.

i. Observations of one spectrophotometric standard star (3 exposures) per detector and spectrograph setup. These observations will be taken with the widest available long-slit (normally 4”). The star will be placed in the middle of the slit. This data will be acquired during the next available twilight. Note that arcs and flats are not normally taken for spectrophotometric standards (the sets coming with the science exposures should be sufficient). For clarity, we ask that the PI clearly mentions in both phase-1 and phase-2 whether or not spectrophotometric standards are needed for the science. Finally, note that if a specific standard star needs to be observed, or the PI wants arcs/flats with the star, these are charged.
ii. Observations of one Lick standard star (3 exposures) per detector and spectrograph setup. The star will be placed in the middle of the slit. These data will be acquired during the next available twilight. See comments above.
iii. 5 spectral flats per detector and spectrograph setup taken during the day or twilight. These can be requested instead of, or in
addition to, the charged UCC flats taken during the night time after the science frames.

i. 5 calibration screen flats per detector and camera setup taken during twilight or day.
ii. 11 biases per detector setup.