Central Bureau for Astronomical Telegrams
IAUC 5519: PKS 0202+149, PKS 0235+164, PKS 0420-014; 1H 0857-242; 1991a1
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Circular No. 5519
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)
PKS 0202+149, PKS 0235+164, PKS 0420-014
The Compton Observatory EGRET Team (R. C. Hartman, D. L.
Bertsch, C. E. Fichtel, S. D. Hunter, P. W. Kwok, J. R. Mattox, 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 three additional
active galactic nuclei (AGN) in the gamma-ray energy range above
100 MeV. PKS 0202+149, PKS 0235+164, and PKS 0420-014 were detected
during Feb. 20-Mar. 5. We note that several EGRET-detected AGN
will soon be again in the EGRET field of view, including PKS
0202+149, PKS 0235+164, PKS 2230+114, and PKS 2251+158 during Apr.
23-May 14, and PKS 0420-014 and PKS 0537-441 during May 14-June 4.
Contemporaneous VLBI, optical, and radio measurements should be of
value for understanding blazar production of gamma rays. Please
notify R. Hartman (rch@sage0.gsfc.nasa.gov) or J. Mattox
(GROSSC::jrm) if you have questions, or if you succeed in making
observations."
1H 0857-242
K. Kasturirangan, ISRO Satellite Centre, Bangalore, communicates:
"This recently discovered dwarf nova was observed by B. N.
Ashoka, S. Seetha, and T. M. K. Marar in its outburst state during
Apr. 4-12. High-speed photometry using the 1-m telescope at Uttar
Pradesh State Observatory, Naini Tal, revealed its orbital modulation
at the known period of about 114 min. The star remained nearly
constant in brightness during Apr. 4.68-5.67 UT and faded 0.1
mag by Apr. 6.62. The decline rate measured on Apr. 6 was about
0.02 mag/hr. Between Apr. 6.71 and 12.647, the star faded by 1.2
mag. This outburst is presumably the next one after the Mar. 6-9
outburst reported on IAUC 5481."
COMET SHOEMAKER-LEVY (1991a1)
Total visual magnitude estimates: May 7.40 UT, 11.7 (G. W.
Kronk, Troy, IL, 0.33-m reflector); 11.46, 11.7 (A. Hale, Las
Cruces, NM, 0.41-m reflector).
1992 May 11 (5519) Daniel W. E. Green
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