Since our system does not have tick level data, “close” and “ltp” are always same. So you can use close or ltp. For example if intraday snap is taken at 1:30 PM. Close will be the LTP available at
Alerts are run intraday as well and “close” in intraday corresponds to last traded price when the intraday snap was taken. So to answer your question - The original alert will be triggered when LTP goes below 1.32 * LTP of GSPL even if it happens during market hours.
If you use “<” instead of “crosses_below” make sure you put the trigger to “only once”. Otherwise, you will keep getting alerts till the time Last Traded Price of Gujarat Gas < 1.32 * Last Traded Price of GSPL.