Center controller reported an airspace violation.

Attributes
ACN	1598262
Time
Date	201811
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	Enroute
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 12
Person 2
Function	Enroute
Qualification	Air Traffic Control Developmental
Events
Anomaly	ATC Issue All Types Airspace Violation All Types Deviation - Procedural Published Material / Policy

Narrative:

FL360 is the bottom of [other center] sector 45; FL350 and below is [other center] sector 47. These 2 sectors are often combined. [Reporters center] has control for descent from [other center]; but point out is required to [other center] sector 47 if 45 and 47 are split. [Other center] sector 45 and 47 were split. OJT in progress at the d-side. Aircraft X at FL360 westbound in [other center] 45 airspace getting a bad ride; lower was better. Aircraft requested lower and r-side descended aircraft to FL340. No point out was made to [other center] 47. We were not aware of this event until 4 hours later. I do not recall what was happening at the time other than listening to the replay.I think we could use the draw function to note on the scope when 45 is open.

Original NASA ASRS Text

Title: Center Controller reported an airspace violation.

Narrative: FL360 is the bottom of [Other Center] Sector 45; FL350 and below is [Other Center] Sector 47. These 2 sectors are often combined. [Reporters Center] has control for descent from [Other Center]; but point out is required to [Other Center] Sector 47 if 45 and 47 are split. [Other Center] Sector 45 and 47 were split. OJT in progress at the D-side. Aircraft X at FL360 westbound in [Other Center] 45 airspace getting a bad ride; lower was better. Aircraft requested lower and R-side descended aircraft to FL340. No point out was made to [Other Center] 47. We were not aware of this event until 4 hours later. I do not recall what was happening at the time other than listening to the replay.I think we could use the draw function to note on the scope when 45 is open.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.