2020RNAAS...4..242T

Here I report the appearance of a new nebula in the constellation Puppis. The nebula was discovered in archived DECam images from 2017 January. Additionally the central source shows an outburst between 2015 February and 2015 April in archived unWISE images. The outburst reached the current brightness in 2016 November (W1 ∼ 3.6 mag, W2 ∼ 1.5 mag). The pre-outburst images from the VST (2012 March) and PanSTARRS (2015 February) do not show any nebulosity around this source. The appearance of reflection nebulae overlapping with the outburst of the central source is known for pre-main sequence stars, such as FU Orionis variables. Follow-up spectroscopy is desired for the central source.