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In 2010 May, an intermediate luminosity optical transient was discovered inthe nearby galaxy NGC 300 by a South African amateur astronomer. In the decadesince its discovery, multi-wavelength observations of the misnamed ``SN2010da'' have continually re-shaped our understanding of this high mass X-raybinary system. In this review, we present an overview of the multi-wavelengthobservations and attempts to understand the 2010 transient event and, later,the re-classification of this system as NGC~300 ULX-1: a red supergiant +neutron star ultraluminous X-ray source.

From SN2010da to NGC 300 ULX-1: Ten Years of Observations of an Unusual High Mass X-ray Binary in NGC 300