Extended Data Fig. 1: Position of GN 069 as inferred from optical, X-ray and radio images.
From: Nine-hour X-ray quasi-periodic eruptions from a low-mass black hole galactic nucleus
a, A 12′ × 12′ region from the Digitized Sky Survey centred on the 2MASS position of GSN 069 (RA 01 h 19 min 08.663 s, dec. −34° 11ʹ 30.52″). The galaxy to the north of GSN 069 and close to the edge of the field is ESO 352−G41. The two bright stars in the field are CD-34 503 and CD-34 498. The red box size is 1.7′ × 1.7′. b, c, The same 1.7′ × 1.7′ region as imaged by the VLA at 6 GHz and by Chandra in the 0.4–2 keV band, respectively. The blue box size in b and c is 12″ × 12″. d, The Chandra X-ray image of the blue box region, with superimposed VLA contours (white) and the 2MASS position (red cross) as reference. No boresight correction was applied to the Chandra data.
