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IAUC 5761: GRO J0422+32; 1993J; 1955S

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IAUC number

                                                  Circular No. 5761
Central Bureau for Astronomical Telegrams
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

GRO J0422+32
     A. V. Filippenko and T. Matheson, University of California,
Berkeley, communicate:  "The brightness of GRO J0422+32 appears to
have dropped precipitously during the past month, after having
declined slowly prior to this.  Very rough estimates made on Apr. 14
UT with the Shane 3-m reflector at Lick Observatory yield V = 17.5-
18, as compared with V = 14.6 on Mar. 13 (IAUC 5734).  The spectrum
(range 300-1000 nm), although noisy, seems rather featureless
except for prominent H-alpha emission."

     M. Centurion, Instituto de Astrofisica de Canarias; and G.
Vladilo, Osservatorio Astronomico di Trieste, write:  "During Apr.
6-9, while observing SN 1993J at high spectral resolution (FWHM =
0.015 nm) with the Utrecht echelle spectrograph on the William
Herschel telescope at La Palma, we detected the K I (neutral potassium)
doublet at 767.6 nm, finding K I absorptions at heliocentric
velocities of -6 (EW = 0.004 nm), +118 (0.001 nm), and +135 km/s
(0.001 nm), in agreement with the velocities of three of the
strongest Na I components reported by King (IAUC 5755)."
     D. R. Zurek, R. M. Robb, and D. D. Balam, University of Victoria,
report:  "We have obtained BVRI observations of SN 1993J using
the 0.5-m reflector (+ CCD) as follows:  Apr. 12.22 UT, V =
11.18 +/- 0.05, B-V = +0.53, V-R = +0.35, V-I = +0.48; 13.18, 11.01
+/- 0.05, +0.49, +0.35, +0.35.  Re-analysis of photometric data
reported on IAUC 5731 using the photometric standards of Corwin (IAUC
5742) yields V = 10.74 +/- 0.05, B-V = -0.11, V-R = +0.09, V-I =
+0.10 on Mar. 30.25.  Photometry in R and I obtained on Apr. 12.22
shows that the supernova has reached a brightness consistent with
that obtained on Mar. 30.25."

     Jean Mueller reports her discovery of an apparent supernova on
Palomar Sky Survey plates taken 1955 Apr. 1 by G. Abell.  SN 1955S
was then at mag about 17.5 and located 17" west and 17" north of
the center of UGC 9933 (R.A. = 15h35m.0, Decl. = +43 43', equinox
1950.0).  There is no object at this position on a J plate taken
1993 Mar. 21 by C. Brewer and J. D. Mendenhall in the course of the
second Palomar Sky Survey.

1993 April 14                  (5761)            Daniel W. E. Green

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