Is G7.7-3.7 the remnant of a low-luminosity historical supernova in 386 CE

We propose a 72 ks XMMNewton EPIC observation toward G7.73.7, a candidatehistorical supernova remnant (SNR), with the aim of pinning down its associationto the guest star which appeared in 386 CE for 24 months. If confirmed,G7.73.7 would be one of four historical TypeII SNRs, enlarging the smallsample that is used for studying the endpoints of massive stars. G7.73.7 may bethe only known SNR to be produced from a rare, lowluminosity TypeIIP SN (5% ofall TypeII SNe) and is therefore worthy of detailed study. The proposedXMMNewton observation will greatly improve the accuracy of the SNR/shock ageand allow us to study the SNR s properties and search for synchrotron emission. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]