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We report the discovery of PSR J1555-2908, a 1.79 ms radio and gamma-raypulsar in a 5.6 hr binary system with a minimum companion mass of 0.052$M_\odot$. This fast and energetic ($\dot E = 3 \times 10^{35}$ erg/s)millisecond pulsar was first detected as a gamma-ray point source in Fermi LATsky survey observations. Guided by a steep spectrum radio point source in theFermi error region, we performed a search at 820 MHz with the Green BankTelescope that first discovered the pulsations. The initial radio pulse timingobservations provided enough information to seed a search for gamma-raypulsations in the LAT data, from which we derive a timing solution valid forthe full Fermi mission. In addition to the radio and gamma-ray pulsationdiscovery and timing, we searched for X-ray pulsations using NICER but nosignificant pulsations were detected. We also obtained time-series r-bandphotometry that indicates strong heating of the companion star by the pulsarwind. Material blown off the heated companion eclipses the 820 MHz radio pulseduring inferior conjunction of the companion for ~10% of the orbit, which istwice the angle subtended by its Roche lobe in an edge-on system.

Discovery, Timing, and Multiwavelength Observations of the Black Widow Millisecond Pulsar PSR J1555-2908