B737-700 captain reported dispatch airborne notification of onboard hazmat shipment.

Attributes
ACN	1600984
Time
Date	201812
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	IMC
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 542
Events
Anomaly	Deviation - Procedural Hazardous Material Violation Deviation - Procedural Published Material / Policy

Narrative:

On climbout we received an ACARS message from dispatch approximately 15 minutes into the flight. Crew was made aware of hazmat onboard by dispatch. Ground ops failed to provide knowledge and paperwork of said hazmat to crew. We never knew it was onboard.

Original NASA ASRS Text

Title: B737-700 Captain reported Dispatch airborne notification of onboard hazmat shipment.

Narrative: On climbout we received an ACARS message from Dispatch approximately 15 minutes into the flight. Crew was made aware of hazmat onboard by Dispatch. Ground Ops failed to provide knowledge and paperwork of said hazmat to crew. We never knew it was onboard.

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.