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Although the connection of the Chinese "guest" star of 393 AD with theGalactic supernova remnant RX J1713.7-3946 (G347.3-0.5) made by Wang et al. in1997 is consistent with the remnant's relatively young properties and the gueststar's projected position within the `tail' of the constellation Scorpius,there are difficulties with such an association. The brief Chinese textsconcerning the 393 AD guest star make no comment about its apparent brightnessstating only that it disappeared after 8 months. However, at the remnant'scurrent estimated 1 - 1.3 kpc distance and A_v ~ 3 mag, its supernova shouldhave been a visually bright object at maximum light (-3.5 to -5.0 mag) andwould have remained visible for over a year. The peak brightness ~ 0 magnitudeadopted by Wang et al. and others would require the RX J1713.7-3946 supernovato have been a very subluminous supernova event similar to or fainter thanCCSNe like SN 2005cs. We also note problems connecting SN 393 with a Europeanrecord in which the Roman poet Claudian describes a visually brilliant star inthe heavens around 393 AD that could be readily seen even in midday. Althoughseveral authors have suggested this account may be a reference to the Chinesesupernova of 393, Scorpius would not be visible near midday in March when theChinese first reported the 393 guest star. We review both the Chinese and Romanaccounts and calculate probable visual brightnesses for a range of supernovasubtypes and conclude that neither the Chinese nor the Roman descriptions areeasily reconciled with an expected RX J1713.7-3946 supernova brightness andduration.

The SN 393 -- SNR RX J1713.7-3946 (G347.3-0.5) Connection