4U 1608-52

Kaluzienski and Holt also report that the flaring source 4U 1608-52 was still bright in early September (cf. IAUC 3099), factor-of-two variations in flux on timescales of hours to days being evident. Ariel 5 observations yielded 3-6 keV fluxes (half-day averages) of 0.68 +/- 0.07 and 0.35 +/- 0.07 times the Crab on Sept. 3 and 5, respectively. M. Duldig, J. Greenhill and R. Thomas, University of Tasmania; R. Haynes and L. Simons, C.S.I.R.O. Radiophysics; and P. Murdin, Anglo-Australian Observatory, observing during a 13-min interval on Aug. 20.4 UT with the Parkes 64-m telescope at a wavelength of 2 cm, obtained an upper limit (2-sigma) of 16 mJy for any radio source in the x-ray error box.