Central Bureau for Astronomical Telegrams
IAUC 5594: NEW HIGH-LATITUDE GAMMA-RAY SOURCES; GRO J0422+32
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Read IAUC 5595
Circular No. 5594
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)
NEW HIGH-LATITUDE GAMMA-RAY SOURCES
The Compton Observatory EGRET Team (S. D. Hunter, D. L.
Bertsch, C. E. Fichtel, R. C. Hartman, P. W. Kwok, J. R. Mattox, B.
G. Piner, P. Sreekumar, and D. J. Thompson, Goddard Space Flight
Center, NASA; D. A. Kniffen, Hampden-Sydney College; J. Chiang, Y.
C. Lin, P. F. Michelson, and P. L. Nolan, Stanford University; E.
Schneid, Grumman Aerospace Corporation; and G. Kanbach, H. A. Mayer-
Hasselwander, C. von Montigny, K. Pinkau, H. Rothermel, and M.
Sommer, Max-Planck-Institut fur Extraterrestrische Physik) communicates:
"We report the tentative identification of two additional
active galactic nuclei in the gamma-ray energy range above 100 MeV.
Both sources have a pre-trial significance above 5 standard
deviations. PKS 0454-463 was detected during the period 1991 July 25-
Aug. 8 but was not detected during 1991 Sept. 19-Oct. 3 or in two
later observations. PKS 1606+106 (= 4C +10.45) was detected during
1992 Jan. 12-27 and Apr. 2-23; however, during the earlier period
1991 Sept. 12-19, only an upper limit was obtained. According
to the current CGRO Phase II Plan, PKS 1606+106 will again be in
the EGRET field of view during 1993 July 8-13."
GRO J0422+32
V. I. Pronik, O. V. Kozlova, and S. G. Sergeev, Crimean
Astrophysical Observatory, report: "On Aug. 20.02 UT, we observed the
H-alpha region of GRO J0422+32 with the 2.6-m Shajn telescope (+
CCD spectrograph). The spectrum (resolution 0.3 nm) shows the
emission line with a width of 1400 km/s at zero intensity level and
equivalent width of 0.26 nm. The radial velocity of the center of
gravity of the line is close to zero."
E. P. Pavlenko and A. A. Shlyapnikov, Crimean Astrophysical
Observatory; and A. J. Castro-Tirado, Danish Space Research Institute,
report: "Review of the blue Palomar Sky Survey chart shows
that at the place of GRO J0422+32 there is only a clustering of
photographic grains that do not permit a statement on the existence
of a star. On the red chart, we found a weak star of estimated
magnitude 16.5 +/- 0.7; if this was indeed the progenitor, the
amplitude of the flare in the R band is about 3.7 mag."
Corrigendum. On IAUC 5588, line 2, for P. Pavlenko, A.
Salyapikov read E. P. Pavlenko, A. A. Shlyapnikov
1992 August 24 (5594) Daniel W. E. Green
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