Regional Jet 700 ER/LR (CRJ700)
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Communication Breakdown; Situational Awareness
ATC Issue All Types; Conflict NMAC; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew FLC complied w / Automation / Advisory; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Returned To Clearance
Human Factors
First flight of the day on day 4 of our trip. We started off in GSO departing off of Runway 23L; we were cleared for takeoff and as we rotated and began to climb through 200-300 ft. AGL; we got a Traffic Advisory alert and at that moment; the First Officer started leveling the aircraft and slowing down at about 400 ft. AGL; the target on radar was directly above us; 100 ft. above us. Looking outside and inside the whole time I was never able to get a visual on the traffic.  After the TA was over I asked Tower if there were any aircraft around us in close proximity; Tower proceeded to say no he had no one on radar around us. We were switched to Departure frequency and ATC asked if we had a TA or RA; I said TA and asked if there was in fact an aircraft around us. After that question there was silence; he never answered; after a few minutes ATC told us to contact Atlanta Center. I replied back and asked again was there another aircraft that close to us? He replied there was a VFR aircraft on vectors; and nothing else.Better communication between departure frequency and Tower frequency.
CRJ700 Captain reported a traffic conflict on departure; resulting in a TA.