Central Bureau for Astronomical Telegrams
IAUC 2915: X-RAY BURST FROM Aql; 1976 AA; 1975d; NOTICE TO Tlgm SUBSCRIBERS IN NORTH AMERICA
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Read IAUC 2916
Circular No. 2915
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
Western Union: RAPID SATELLITE CAMBMASS
X-RAY BURST FROM AQUILA
G. Clark, Massachusetts Institute of Technology, reports that
the SAS-3 Group has detected a brief, intense burst of x-rays from
a source in a region far from the galactic center and within a circle
of radius 12o centered at R.A. = 19h29m, Decl. = +7o.9 (l = 44o.6, b =
-5o.1). The burst occurred on 1975 July 15 17h33m14s UT; it rose in
less than 2s to an intensity comparable to that of the Crab Nebula
in the energy range 1-10 keV and decayed in about 10s. The average
spectrum was harder than that of the Crab. The burst resembles
those reported from the globular cluster NGC 6624 (IAUC 2879, 2907)
and from a direction near the galactic center (IAUC 2911).
1976 AA
Further precise positions have been reported as follows:
1976 UT R. A. (1950) Decl. Mag. Observer
Jan. 21.50000 5 13 57.97 +45 51 05.3 14.5 Urata
21.50139 5 13 57.17 +45 51 14.9 "
23.41200 4 57 50.72 +48 50 23.3 15 "
23.41866 4 57 47.27 +48 50 59.2 "
28.18611 4 17 43.68 +54 39 35.8 Giclas
28.20417 4 17 34.15 +54 40 37.8 "
Feb. 3.19375 3 31 30.02 +59 19 58.3 Helin
3.30382 3 30 40.54 +59 23 35.0 "
T. Urata (JCPM Jakiimo Sta.). From Nihondaira Obs. Circ. No. 732.
H. L. Giclas (Lowell Observatory). Measurer: M. L. Kantz.
E. Helin (Palomar Mountain Observatory). Measurer: S. J. Bus.
The following improved orbital elements, by the undersigned,
are from 46 observations Jan. 7 to Feb. 3:
T = 1976 May 20.1283 ET
Peri. = 147.7204 e = 0.183139
Node = 108.0836 1950.0 a = 0.966801 AU
Incl. = 19.0549 n = 1.036808
q = 0.789742 AU P = 0.951 year
1976 ET R. A. (1950) Decl. Delta r Mag.
Mar. 13 0 39.12 +66 42.0 0.312 0.939 17.4
18 0 22.99 +66 20.3
23 0 07.92 +65 35.4 0.329 0.907 17.6
28 23 54.53 +64 24.7
Apr. 2 23 43.43 +62 45.9 0.339 0.875 17.7
7 23 35.13 +60 36.9
12 23 30.00 +57 56.3 0.343 0.847 17.8
17 23 28.25 +54 44.3
22 23 29.90 +51 02.6 0.346 0.822 17.9
27 23 34.73 +46 55.0
May 2 23 42.42 +42 26.8 0.353 0.804 17.9
7 23 52.61 +37 45.2
12 0 04.93 +32 59.3 0.369 0.793 18.0
17 0 19.02 +28 19.1
22 0 34.54 +23 53.9 0.399 0.799 18.1
Mag. = 18.0 + 5 log Delta + 5 log r + 0.023 (phase angle)
COMET BRADFIELD (1975d)
Extension of the ephemeris on IAUC 2842:
1976 ET R. A. (1950) Decl. Delta r m2
Mar. 23 11 49.93 +25 58.5 3.680 4.589 19.4
Apr. 2 11 43.00 +26 59.7
12 11 37.05 +27 41.9 4.011 4.783 19.8
22 11 32.35 +28 06.7
May 2 11 29.06 +28 16.2 4.430 4.974 20.2
12 11 27.21 +28 13.1
22 11 26.76 +27 59.7 4.899 5.162 20.6
m2 = 10.0 + 5 log Delta + 10 log r
NOTICE TO TELEGRAM SUBSCRIBERS IN NORTH AMERICA
Several subscribers appear to have misunderstood the remark on
IAUC 2911, which refers to our telegram service, rather than to
these postcard Circulars. In any case, it appears to be impracticable
to use night letters, because collect service requires a 100-word
minimum. Telegram subscribers will have noticed that Western
Union's domestic service has deteriorated recently, and while we
have taken this matter up with the Company, there is obviously
nothing we can do about the costs, which have risen enormously (overseas
cablegrams can often be sent more cheaply!). For this reason,
we recommend that telegram subscribers attempt to acquire access to
TWX or telex facilities. Another possibility would be to make
greater use of the telephone, although we stress that it would be
quite impossible for the Central Bureau to contact more than four
subscribers in this way; we could select those subscribers on the
basis of their willingness to pass on the messages to other subscribers.
We are aware that some amateur groups relay information
in this way but would welcome participation by professionals. We
hereby solicit advice on the subject and any offers of assistance.
1976 February 24 (2915) Brian G. Marsden
Read IAUC 2916
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