21 New Pulsar Timing Solutions from the GBNCC Pulsar Survey

We present timing solutions for 21 pulsars discovered in 350 MHz surveys using the 100-m Green Bank Telescope (GBT). These pulsars were discovered in the Green Bank North Celestial Cap (GBNCC) pulsar survey, a 350 MHz all-GBT-sky pulsar survey; except for one discovery from the GBT 350 MHz Drift-scan pulsar survey. These timing solutions are the result of a dedicated ~year-long GBT timing campaign at 820 MHz. Where applicable, we also incorporate observations from discovery, confirmation, and initial followup with the GBT at 350 MHz, additional GBT followup from 350−2000 MHz, and observations using the Arecibo radio telescope, Long Wavelength Array (LWA), and Low Frequency Array (LOFAR). PSRs J0032+6946 and J0214+5222 are mildly recycled pulsars in wide, >1-year-period binaries. PSRs J0141+6303, J1327+3423, and J1434+7257 are disrupted recycled pulsars: their spin periods ~40 ms and magnetic fields <10¹⁰ G are evidence of past accretion, but each lacks a binary companion. PSR J0636+5128 is a non-eclipsing “black widow” MSP in a 1.6-hr orbit, and is observed by pulsar timing arrays searching for low-frequency gravitational waves. PSR J1239+3239 is an MSP in a 4-day orbit with a binary companion. The “redback” PSR J1816+4510 is an eclipsing binary MSP, for which we measure the derivative of projected semimajor axis, d (a × sin(i) / c) / dt = -1.0(2) × 10^-13. The remaining pulsars are isolated, canonical pulsars, including the rotating radio transient (RRAT) PSR J0957−0619 and nulling pulsars PSRs J1530−2114, J2145+2158, and J2210+5712.