Central Bureau for Astronomical Telegrams
IAUC 6185: 1995S; PKS 1622-297
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Circular No. 6185
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
Phone 617-495-7244/7440/7444 (for emergency use only)
SUPERNOVA 1995S IN NGC 4456
R. H. McNaught, Anglo-Australian Observatory, reports his
discovery of a supernova (mag about 17.5) on an R survey film taken
by K. S. Russell with the U.K. Schmidt telescope (UKST) on July 3.4
UT. A confirming unfiltered CCD image was obtained by G. J.
Garradd and McNaught with the 1.0-m reflector at Siding Spring on
July 6. SN 1995S is located at R.A. = 12h27m53s.30, Decl. =
-30o05'55".4 (equinox 2000.0, uncertainty 0".4 in each coordinate),
which is 12" east and 3" south of the center of NGC 4456. SN 1995S
is offset from a star of mag 20 (clearly present on the ESO R and
SERC J surveys) by about 7" in p.a. 200 deg; this star and another
further south both lie on a spiral arm, and the supernova lies
inside this arm. SN 1995S is not present on UKST R plates taken by
Russell on Feb. 7 (limiting mag 21) and May 28 (limiting mag 20),
nor on an I survey plate taken on Mar. 11 by M. J. Drinkwater;
likewise, no image appears at the given position on several ESO and
SERC B, J, R, and I survey films. A nearby star of mag about 15.5
has position end figures 50s.88, 06'08".0.
PKS 1622-297
J. D. Kurfess, J. E. Grove, K. McNaron-Brown, and W. N.
Johnson, Naval Research Laboratory, on behalf of the OSSE team; J.
R. Mattox, University of Maryland and Universities Space Research
Association; S. Wagner, Landessternwarte Heidelberg; and J. R. Webb,
Florida International University, communicate: "Optical
observations of PKS 1622-297 at Calar Alto, at La Silla, and with
the SARA telescope on Kitt Peak indicate that PKS 1622-297 is now
at mag about 17 (at least 3 mag brighter than its historical value).
The OSSE instrument aboard Compton detects this quasar from 50-200
keV at a significance of 6 sigma during the interval June 30-July 6,
with an indication that the flux is somewhat higher on July 5-6.
The EGRET instrument aboard the Compton Observatory continues to
detect PKS 1622-297. The high-energy gamma-ray flux peaked on June
25 and has declined since then. The Compton observations of PKS
1622-297 were extended until July 10, and the OSSE instrument will
continue monitoring the source through July 24. Observations at
other wavelengths continue to be very important."
1995 July 11 (6185) Daniel W. E. Green
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