== P3.20	Instrumental background for science == 
•	**Phase**		:	3  
•	**Status**		: 	Draft	 
•	**Category**		: 	Daytime calibration (C3)
•	**Recurrence**	: 	every day starting from commissioning.
•	**Duration**		: 	20 minutes
**Description**
•	Take instrumental background for the same night setup with closed dome and instrument. Note that there are no lights for this testing. The purpose is to remove the instrumental background from science images.
**Prerequisites**
**Procedure**
•	Observe the instrumental background in the same setup of the night with all nights off and dome and instrument (shutter) closed.
**Success criteria**
•	Accuracy better than 10%. 
**Notes**
•	Same as activity 7.7 in AD4
**LBTO support**
•	Support from LBTI/LBTO?
**Associated SHARK-NIR personnel**
•	JF, LM, MdP
**Date performed and by whom**