  At 12:07 UT (8:07 pm China Standard Time) on 2017 Oct 4, a bright bolide was
widely observed in the Shangri-La region in the Province of Yunnan, China
(Figure 1). The event was well observed by the general public as it took place
on the night of the Mid Autumn Festival which associates with moon gazing.
Sonic booms and ground shaking were reported in an area about a thousand square
kilometers wide to the northwest of the Shangri-La City. Data from the U.S.
government sensor suggested that the impact energy of the event is
approximately 0.54 kt TNT equivalent, with the terminus of the bolide
positioned at $28.1^\circ$ N, $99.4^\circ$ E. This is the largest observed
bolide event overland since the bolide event took place in Mauritania on 2016
Jun 27 (1.2 kt). In this Research Note we present a preliminary analysis of
this event.
