EXO 165228+3930.3

L. Bassani, E. Caroli, J. B. Stephen, and G. Di Cocco, Istituto TESRE, Consiglio Nazionale delle Ricerche, Bologna, report: "We have found a new source, EXO 165228+3930.3, at high galactic latitude (R.A. = 16h52m27.9, Decl. = +39 30'20.2, equinox 1950.0, error radius 20"). The source, which lies about 20' south of the observed target (Markarian 501), was detected in only 3 observations (at > 5 sigma confidence level) out of a total of 8 measurements taken by the Low Energy Experiment (LE1/CMA) on board EXOSAT during 1984. The object was found on exposures taken with the thin Lexan (0.0113 +/- 0.0014 cts/s) and Al/Parylene (0.0045 +/- 0.0015 cts/s) filters. The same object was detected previously as a serendipitous Einstein source (at R.A. = 16h52m27.5, Decl. = +39 30'43.9, equinox 1950.0, error radius 60"), but its detection was never reported in the literature. Two Imaging Proportional Counter (IPC) observations included this object in the field of view of the instrument: Sequence No. I5210, made on 1980 Jan. 19-20, gave a source intensity of 0.038 +/- 0.005 IPC cts/s, and Sequence No. I5211, made on 1980 Aug. 15, gave a source intensity of 0.042 +/- 0.009 IPC cts/s. The interest in the object lies in its possible association with the far-infrared source IRAS 1652+39.5 (Bassani et al. 1986, ESA SP-260, 151)."