Circular No. 5860
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)



GRO J0422+32
     P. Zhao, P. Callanan, M. Garcia, and J. McClintock, Smithson-
ian Astrophysical Observatory, write:  "CCD photometry obtained at
the F. L. Whipple Observatory 1.2-m telescope gives the following R
magnitudes:  Sept. 8.37 UT, 18.1 +/- 0.5; 9.48, 17.7 +/- 0.2.
Thus, GRO J0422+32 has dimmed by about 2-3 mag since its unexpected
brightening on Aug. 10-16 (cf. IAUC 5842, 5844).  This may help ex-
plain the faintness of the x-ray source observed on Aug. 26 UT
(IAUC 5851).  Since the optical counterpart's rapid decline in Mar.-
Apr., we have obtained photometry on 16 nights during Apr. 13-28 (V,
R), July 18-29 (R), and Sept. 8-9 (R); all these low-state data are
consistent with V = 17.6 +/- 0.3 and R = 17.8 +/- 0.3.  We have mon-
itored V and R on 58 nights since 1992 Nov. 18."



1993 September 11              (5860)            Daniel W. E. Green