Is spectroscopic mode (1-fiber or 2-fibers) specified in the proposal instrument resource list?
Is your choice of spectroscopic mode give appropriate spectral resolution? If you choose the 1-fiber mode, is your target bright enough to neglect sky-subtraction? If you choose the 2-fiber mode, is the spectral resolution high enough for your science goal(s)?
Telescope peripheral wavefront sensors:
It is not recommended to use the peripheral wavefront sensors for GRACES in most cases. Have you made sure that an OIWFS guide star is selected?
Note that peripheral wavefront sensors can be used for non-siderial targets.
Calibrations:
Are the baseline calibrations sufficient? If not, what additional calibration data are required for your program?
Is absolute spectrophotometric calibration needed? If so, have appropriate spectroscopic standard star observations been included?
Is accurate removal of telluric lines needed? If so, have telluric standard stars been included?
Has sufficient observing time been requested for additional calibrations?
Observing time:
Did you confirm the exposure time and S/N using the GRACES exposure time calculator?
Did you adjust the observing conditions specified to match your requested conditions?
Are overheads included in the time requested in your proposal?
Have overheads been included for additional calibrations?
If many very short exposures are needed, you may need to include larger overheads to account for the lower observing efficiency.
Note the product of the probabilities of each of the conditions listed above. You might wish to reconsider the minimum requirements of your program, and/or consider submitting your project as a queue-scheduled observation.