Air carrier flight crew reported a GPWS alert while in IMC conditions on radar vectors.

Attributes
ACN	1507924
Time
Date	201712
Place
Locale Reference	BOI.TRACON
State Reference	ID
Environment
Flight Conditions	IMC
Aircraft 1
Make Model Name	Large Transport
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Person 1
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Type 922
Person 2
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	ATC Issue All Types Inflight Event / Encounter CFTT / CFIT

Narrative:

During the arrival phase into bzn at an ATC assigned altitude of 11;000 ft; we received a GPWS 'pull-up' warning while in IMC conditions. I was the flying pilot; and we were on an ATC assigned vector. We complied with the GPWS recovery procedures of the SOP; climbed to approximately 12;000 ft; and reported the altitude deviation to ATC. The flight then continued to bzn without further incident.

Original NASA ASRS Text

Title: Air Carrier flight crew reported a GPWS alert while in IMC conditions on radar vectors.

Narrative: During the arrival phase into BZN at an ATC assigned altitude of 11;000 ft; we received a GPWS 'Pull-up' warning while in IMC conditions. I was the flying pilot; and we were on an ATC assigned vector. We complied with the GPWS recovery procedures of the SOP; climbed to approximately 12;000 ft; and reported the altitude deviation to ATC. The flight then continued to BZN without further incident.

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.