UKIRT INTEGRATION TIME CALCULATOR

Release Notes

Usage

1. Set up the calculator by selecting instrument, filter and sky brightness and seeing/aperture (or accepting the defaults, which are chosen sensibly).
2. Perform the calculation by either (i) entering source brightness (if calculating exposure time or s/n) and entering a number in either the integration time or s/n fields (the result is then either s/n or integration time), or (ii) entering an integration time and s/n (in which case the result is the minimum source brightness required to obtain that s/n in that integration).

Known bugs

1. The "extended source" calculation is not currently returning correct values.

WFCAM

1. Short exposures in the narrow-band and Y and Z filters are not background limited. See the WFCAM user guide for details on background-limited exposures. The difference is accurately reflected here, in the sense that the readnoise dominance affects the reported sensitivity in these filters when short exposure times are used.

ITC Authors