B737-900 captain reported GPWS callout made while on downwind vector.

Attributes
ACN	1618935
Time
Date	201902
Local Time Of Day	1801-2400
Place
Locale Reference	SAT.Airport
State Reference	TX
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B737-900
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Route In Use	Vectors
Flight Plan	IFR
Component
Aircraft Component	GPWS
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Commercial
Experience	Flight Crew Last 90 Days 112 Flight Crew Type 56
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT

Narrative:

Downwind vectoring off braun arrival for 13R. 2500 foot GPWS callout made on downwind; no approach clearance issued yet.

Original NASA ASRS Text

Title: B737-900 Captain reported GPWS callout made while on downwind vector.

Narrative: Downwind vectoring off BRAUN Arrival for 13R. 2500 foot GPWS callout made on downwind; no approach clearance issued yet.

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.