Central Bureau for Astronomical Telegrams
IAUC 6411: GRS 1915+105; GRO J1655-40; 1996ae
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Circular No. 6411
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
Phone 617-495-7244/7440/7444 (for emergency use only)
GRS 1915+105
S. N. Zhang, C. R. Robinson, B. A. Harmon, W. S. Paciesas, and
G. J. Fishman, Marshall Space Flight Center, NASA, report for the
Compton Gamma Ray Observatory BATSE team: "A hard x-ray outburst
from GRS 1915+105 is being detected by BATSE/CGRO. Its 20- to 100-
keV flux has increased almost linearly from an upper limit of about
50 mCrab on May 15-18 to about 250 mCrab on May 24 and remained
bright with significant day-to-day variations of 20-50 percent as
of May 27. This flux level is slightly below the average peak flux
(about 300 mCrab) of this source during previous outbursts."
G. Pooley, Mullard Radio Astronomy Observatory, Cambridge,
writes: "After four months of apparent inactivity in the radio
band, GRS 1915+105 has shown a bright flare at 15 GHz. The Ryle
Telescope has been monitoring the source intermittently since the
outburst at the end of 1995 (IAUC 6269). The only significant
detections since 1996 Jan. 20 were on the four days May 23-26, when
peak flux densities near 100 mJy were observed. Strong
quasiperiodic oscillations were observed, with periods near 40 min
(cf. IAUC 6269) and 25 min, and possibly others. The source was
only marginally detected on May 27 (4 mJy) and not detected on May
28."
GRO J1655-40
R. M. Hjellming and M. P. Rupen report recurrence of radio
emission from the x-ray transient GRO J1655-40: "A Very Large
Array observation at 4.8 GHz on May 29.25 UT showed the presence of
a 19-mJy radio source at the position of the radio, optical, and x-
ray source first detected in 1994. The radio source was not
present (with upper limits of 0.5 mJy) in VLA observations from
1995 Jan. through 1996 May 20. This radio source is probably
related to the recurrence of x-ray and optical activity reported on
IAUC 6393 and 6406."
SUPERNOVA 1996ae IN NGC 5775
R. M. Rich and R. A. Mendez report the following rough CCD
magnitudes of SN 1996ae obtained on May 28.0 UT with the Cerro
Tololo 0.9-m telescope: U = 18.7 +/- 0.1, B = 18.8, V = 17.4, R =
18.3, I = 17.6 +/- 0.05.
(C) Copyright 1996 CBAT
1996 May 31 (6411) Daniel W. E. Green
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