Central Bureau for Astronomical Telegrams
IAUC 5779: 1993J; GRS 1915+105 AND Her X-1; HR 1469 = NSV 1671
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Circular No. 5779
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)
SUPERNOVA 1993J IN NGC 3031
A. C. Porter, Kitt Peak National Observatory, reports: "Nightly
low-resolution (about 0.8 nm) spectroscopic monitoring of SN
1993J in the range 400-750 nm has been carried out on the KPNO 2.1-
m telescope (+ Goldcam spectrograph) on Apr. 15-19 UT by J. Stocke,
E. Perlman, and E. Ellingson (University of Colorado); on Apr. 20-
22 by T. Lauer (KPNO) and M. Postman (Space Telescope Science
Institute); and on Apr. 24-30 by F. Owen (National Radio Astronomy
Observatory) and M. Ledlow (University of New Mexico and NRAO). An
absorption feature in the peak of the broad H-alpha emission line,
which first became visible on about Apr. 19, has grown into a
prominent notch about 10 nm wide on Apr. 30. Continued and higher-
resolution spectroscopic and polarimetric observations of this
feature are urged. Observers are also advised that instrumentation
schedules may prevent regular JHK photometry or near-infrared
spectroscopy (800-1000 nm, including the calcium triplet) from being
done at KPNO during May. Other observatories should make a special
effort to fill in these gaps."
GRS 1915+105 AND HERCULES X-1
S. Brandt, A. J. Castro-Tirado, and N. Lund, Danish Space
Research Institute, report: "The x-ray transient GRS 1915+105 (IAUC
5590, 5619) has been observed by the WATCH experiment on EURECA
from Apr. 27.25 to 29.90 UT during the first of four offset pointings
of the satellite. After nearly one year, the source is still
very bright (580 +/- 60 mCrab at 6-12 keV; 160 +/- 30 mCrab at 12-
20 keV). This strengthens the case for an association between the
x-ray transient and the variable radio source recently reported
(IAUC 5773). The x-ray source Her X-1 was observed during the same
pointing with average fluxes 170 +/- 30 mCrab at 6-12 keV and 280
+/- 50 mCrab at 12-20 keV."
HR 1469 = NSV 1671
U. Bastian, Heidelberg, reports that a photograph taken by D.
Becker, Schongau, Germany, shows a star trail of HR 1469 (cf. IAUC
5656, 5675) at its normal brightness from 1992 Nov. 7.906 to 7.917
UT, suggesting that the fading reported on IAUC 5656 (if real)
lasted < 3.3 days.
1993 April 30 (5779) Daniel W. E. Green
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