Central Bureau for Astronomical Telegrams
IAUC 3161: X-RAY FLARE; X-RAY Obs OF GALAXIES; 1977g; 1977h
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Read IAUC 3162
Circular No. 3161
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK Telex: 921428
Telephone: (617) 864-5758
X-RAY FLARE
S. S. Holt and L. J. Kaluzienski, Goddard Space Flight Center,
report the observation of an x-ray nova with the Ariel 5 all-sky
monitor. The best position is R.A. = 1h14m, Decl. = +63o.4 (equinox 1950.0)
with a 90-percent-confidence error circle of radius 1o.5. The
source first appeared above the all-sky-monitor detection threshold
of 0.1 Crab (at 3-6 keV) on 1977 Dec. 30, and its intensity through
1978 Jan. 11 has steadily increased at a daily rate of ~ 0.025 Crab.
G. Clark and L. Cominsky, Massachusetts Institute of Technology,
have independently reported the detection of a hard x-ray
flare within an error circle of radius 0o.5 centered at R.A. = 1h16m.0,
Decl. = +63o15' (equinox 1950.0). They suggest that the source is a
recurrence of the transient 4U 0115+63 (Forman et al. 1976, Astrophys.
J. 206, L29). It was first detected by SAS 3 on Jan. 5.8 UT at a
flux equal to 0.17 Crab (at 2-10 keV). The x-ray emission is
pulsed with a period of ~ 3.6 seconds.
X-RAY OBSERVATIONS OF GALAXIES
K. A. Pounds, Department of Physics, University of Leicester,
Leicester LE1 7RH, England (telex 341664 LUXRAY G), communicates:
"The Ariel 5 sky-survey instrument has begun an extended observation
of four active galaxies, viz. Mk 421, NGC 4151, NGC 5548 and
NGC 7592, as well as of the group NGC 5920, all of which are known
x-ray emitters. The observations will continue for 3-5 weeks, and
overlapping optical, infrared or radio photometry would be of
considerable interest. For further information please contact me."
PERIODIC COMET ASHBROOK-JACKSON (1977g)
Continuation to the ephemeris on IAUC 3021:
1978/79 ET R. A. (1950) Decl. Delta r m2
Mar. 13 21 21.68 -24 23.8 3.263 2.545 18.1
23 21 40.72 -22 51.3
Apr. 2 21 59.27 -21 14.0 3.051 2.488 17.9
12 22 17.31 -19 32.9
22 22 34.77 -17 49.0 2.819 2.437 17.6
May 2 22 51.61 -16 03.3
12 23 07.75 -14 17.2 2.573 2.392 17.3
22 23 23.12 -12 31.5
June 1 23 37.62 -10 47.4 2.322 2.354 17.0
11 23 51.11 - 9 06.3
21 0 03.42 - 7 28.6 2.071 2.324 16.7
July 1 0 14.35 - 5 55.9
11 0 23.64 - 4 29.1 1.831 2.302 16.4
21 0 31.01 - 3 09.1
31 0 36.12 - 1 56.6 1.613 2.289 16.1
Aug. 10 0 38.66 - 0 52.4
20 0 38.41 + 0 03.3 1.435 2.284 15.9
30 0 35.30 + 0 50.3
Sept 9 0 29.59 + 1 29.2 1.323 2.289 15.7
19 0 21.92 + 2 01.5
29 0 13.31 + 2 29.4 1.301 2.302 15.7
Oct. 9 0 05.00 + 2 56.0
19 23 58.12 + 3 24.4 1.380 2.324 15.9
29 23 53.54 + 3 57.6
Nov. 8 23 51.70 + 4 37.6 1.549 2.355 16.2
18 23 52.68 + 5 25.6
28 23 56.32 + 6 21.9 1.783 2.393 16.5
Dec. 8 0 02.32 + 7 26.3
18 0 10.37 + 8 38.0 2.059 2.438 16.9
28 0 20.15 + 9 56.3
Jan. 7 0 31.38 +11 19.9 2.356 2.489 17.3
17 0 43.81 +12 47.7
27 0 57.24 +14 18.4 2.656 2.546 17.7
Feb. 6 1 11.53 +15 51.1
16 1 26.52 +17 24.3 2.949 2.607 18.0
26 1 42.12 +18 57.1
Mar. 8 1 58.25 +20 28.4 3.221 2.673 18.3
18 2 14.82 +21 57.2
28 2 31.77 +23 22.7 3.465 2.741 18.6
m2 = 11.5 + 5 log Delta + 10 log r
PERIODIC COMET WHIPPLE (1977h)
The following precise positions have been reported:
1977 UT R. A. (1950) Decl. Observer
July 12.74352 21 22 06.90 - 2 19 48.9 Jekabsons
Aug. 15.18586 21 02 37.56 - 4 11 45.1 McCrosky
P. Jekabsons (Perth Observatory, Bickley). 33-cm astrograph.
R. E. McCrosky (Harvard College Observatory, Agassiz Station). 155-cm
reflector. Measurer: J. H. Bulger.
1978 January 16 (3161) Brian G. Marsden
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