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IAUC 5527: Prob. N IN Sco; QSO 1741-038; 1991K; N Pup 1991; N Cyg 1992

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IAUC number 

                                                  Circular No. 5527
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)


PROBABLE NOVA IN SCORPIUS
     P. M. Kilmartin communicates the following photometry of this
object (cf. IAUC 5526) obtained by A. C. Gilmore at Mount John
Observatory under marginal conditions:  May 26.40 UT, V = 7.26 +/-
0.08, B-V = +1.19 +/- 0.03, U-B = +0.79 +/- 0.05, V-R = +0.72 +/-
0.02, V-I = +1.52 +/- 0.03.


QSO 1741-038
     R. L. Fiedler, K. J. Johnston, and E. B. Waltman, Naval
Research Laboratory; and F. Ghigo, National Radio Astronomy
Observatory, report:  "The NRL-GBI Monitoring Program has observed that
the quasar 1741-038 is currently going through an Extreme Scattering
Event (ESE).  The flux density at 2.25 GHz has fallen from 2.2
to 0.85 Jy in 50 days.  The minimum or mid-point of the ESE may
have just occurred.  We are suggesting that multi-frequency observations
be scheduled at this time.  The object is located at R.A. =
17h41m20s.60, Decl. = -3 48'48".9 (equinox 1950.0)."


SUPERNOVA 1991K IN NGC 2851
     C. Pollas, Observatoire de la Cote d'Azur, reports that C.
Buil has found a pre-discovery image of SN 1991K (cf. IAUC 5196) is
present at mR about 17 on a CCD image taken 1990 Dec. 15.26 UT,
which can be found in Buil and Thouvenot's Atlas of Deep-Sky Objects.


NOVA PUPPIS 1991
     Gilmore reports the following Mount John photometry (+/- 0.01
unless otherwise noted):  Apr. 9.36 UT, V = 11.07, B-V = +0.19, U-B
= -0.64, V-R = +1.46, V-I = +1.42 +/- 0.05; Apr. 19.40, 11.15,
+0.13, -0.75, +1.40, +1.26 +/- 0.03.
     N. M. Ashok, T. Chandrasekhar, and S. Ragland, Physical
Research Laboratory, Ahmedabad, communicate:  "Infrared observations
were made as described by Ashok et al. on IAUC 5525.  N Pup 1991
was in an optically thin phase on Apr. 12.62 UT, when we measured J
= 8.11, H = 8.69, and K = 8.78."


NOVA CYGNI 1992
     Corrigendum.  On IAUC 5526, last line, the observation by A.
Jones was of the 'Probable Nova in Scorpius', not N Cyg 1992.


1992 May 26                    (5527)            Daniel W. E. Green

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