Central Bureau for Astronomical Telegrams
IAUC 5193: 1991 DA; GRS 1406+598
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Circular No. 5193
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 or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
1991 DA
R. H. McNaught, University of Adelaide, reports his discovery
of a fast-moving asteroidal object on a Feb. 18 U.K. Schmidt Telescope
plate taken by P. McKenzie. Follow-up observations were made
by McNaught with the Uppsala Southern Schmidt:
1991 UT R.A. (1950) Decl. V
Feb. 18.52973 9 35 23.84 -72 05 32.1 17
18.57140 9 35 07.10 -72 06 17.1
19.67361 9 27 51.01 -72 25 04.6
19.70995 9 27 36.43 -72 25 38.5
20.46894 9 22 33.06 -72 37 27.3
Very preliminary orbital elements by G. V. Williams, Center for
Astrophysics, from the above observations:
T = 1991 Sept.10.04 ET Peri. = 70.35
e = 0.2375 Node = 277.97 1950.0
q = 0.8090 AU Incl. = 36.61
a = 1.0610 AU n = 0.90185 P = 1.09 years
1991 ET R.A. (1950) Decl. Delta r V
Feb. 21 9 18.9 -72 45.0 0.770 1.313 16.8
23 9 05.0 -73 09.8
25 8 50.8 -73 28.0 0.773 1.313 16.9
27 8 36.5 -73 39.7
Mar. 1 8 22.3 -73 45.2 0.775 1.312 16.9
GRS 1406+598
N. Lund, on behalf of the WATCH/GRANAT team (Danish Space
Research Institute, Lyngby; and Space Research Institute, Moscow),
reports: "A peculiar cosmic gamma-ray burst, GRS 1406+598 (R.A. =
14h06m, Decl. = +59.8, equinox 1950.0, error radius about 1 deg;
position determined with the WATCH RMC system and limited by the
counting statistics), was recorded by WATCH on Feb. 19.49 UT. The
burst consisted of two spikes of comparable intensity, each of duration
3 s, separated by an interval of 55 s during which the flux was
very low, certainly < 5 percent of the peak flux. The total fluence
in the burst was about 10E-6 erg cmE-2, the peak flux about 10E-7
erg cmE-2 sE-1. Optical and radio follow-up are encouraged."
1991 February 21 (5193) Daniel W. E. Green
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