CL600 captain reported tower issued a low altitude alert on a visual approach to aus.

Attributes
ACN	1638203
Time
Date	201904
Local Time Of Day	0001-0600
Place
Locale Reference	AUS.Airport
State Reference	TX
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Challenger CL600
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	Visual Approach
Flight Plan	IFR
Person 1
Function	Captain
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 200 Flight Crew Total 15000 Flight Crew Type 5000
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Inflight Event / Encounter CFTT / CFIT

Narrative:

While approaching to land at aus via radar vectors; houston approach cleared us for the visual 17L after informing them that we had the airport in sight and they informed us to contact tower.after being cleared for the visual 17L and maintaining visual references; we descended from 2;000 feet to 1;600 feet for the glide slope intercept altitude at ddtoo as a backup reference for the visual approach to 17L.visual separation and VFR conditions were maintained during the approach and tower informed us about a low altitude alert; we informed them that we had the field in sight and visual separation was being maintained during the final phase. After the alert; we informed tower that we were climbing back to 2;000 feet and completed the approach. Tower informed us to contact them after landing to talk to them about the alert. Tower supervisor was contacted and informed us about the altitude alert and that everything was ok.

Original NASA ASRS Text

Title: CL600 Captain reported Tower issued a low altitude alert on a visual approach to AUS.

Narrative: While approaching to land at AUS via radar vectors; Houston Approach cleared us for the visual 17L after informing them that we had the airport in sight and they informed us to contact Tower.After being cleared for the visual 17L and maintaining visual references; we descended from 2;000 feet to 1;600 feet for the glide slope intercept altitude at DDTOO as a backup reference for the Visual Approach to 17L.Visual separation and VFR conditions were maintained during the approach and Tower informed us about a Low Altitude Alert; we informed them that we had the field in sight and visual separation was being maintained during the final phase. After the alert; we informed Tower that we were climbing back to 2;000 feet and completed the approach. Tower informed us to contact them after landing to talk to them about the alert. Tower supervisor was contacted and informed us about the altitude alert and that everything was ok.

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.