A hot and fast ultra-stripped supernova that likely formed a compact neutron star binary by De, K, Kasliwal, MM, Ofek, EO, Moriya, TJ, Burke, J, Cao, Y, Cenko, SB, Doran, GB, Duggan, GE, Fender, RP, Fransson, C, Gal-Yam, A, Horesh, A, Kulkarni, SR, Laher, RR, Lunnan, R, Manulis, I, Masci, F, Mazzali, PA, Nugent, PE, Perley, DA, Petrushevska, T, Piro, AL, Rumsey, C, Sollerman, J, Sullivan, M, Taddia, F