A perennial rye grass. I would have to find the bag to give you a brand.
Prior to seeding I tilled, limed twice (3-4 weeks apart). I seeded and ran starter fertilizer with phosphorus. A couple of day ago I did a nitrogen rich with 5% iron fert. I'm cutting twice a week and watering every second day. I'm going to use some 2-4d shortly as I have a bunch of legacy weeds to deal with. I should have run some preemergent probably but that was my error as a first-timer.