Emb-135LR first officer reported an near midair collision event during arrival.

Attributes
ACN	1744128
Time
Date	202005
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	EMB ERJ 135 ER/LR
Flight Phase	Descent
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Plan	None
Person 1
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Conflict NMAC Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance

Narrative:

We were at 13;000 feet; 8 miles from zzzzz on the arrival into ZZZ. ATC called traffic and we responded; looking. We saw the traffic on the box showing 400 feet below us and ahead of us. We got an aural traffic alert from the box. Then got RA climb. We complied to climb and got to 13;300 feet. Then heard clear of traffic. Told ATC we got RA and had to climb. When clear; told ATC we were going back down to 13;000 feet.

Original NASA ASRS Text

Title: EMB-135LR First officer reported an NMAC event during arrival.

Narrative: We were at 13;000 feet; 8 miles from ZZZZZ on the arrival into ZZZ. ATC called traffic and we responded; looking. We saw the traffic on the box showing 400 feet below us and ahead of us. We got an aural traffic alert from the box. Then got RA CLIMB. We complied to climb and got to 13;300 feet. Then heard clear of traffic. Told ATC we got RA and had to climb. When clear; told ATC we were going back down to 13;000 feet.

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.