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IAUC 7196: GRS 1915+105; V382 Vel; 1999cd, 1999cf

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IAUC number

                                                  Circular No. 7196
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)

GRS 1915+105
     E. Gerard, Observatoire de Paris-Meudon, communicates:  "The
large flare reported on June 8 (IAUC 7195) is still in progress on
June 9 at 1410 and 3300 MHz.  The flux densities measured with the
Nancay radio telescope are respectively 0.2 and 0.4 Jy (June 8.1
UT) and 0.5 and 0.5 Jy (June 9.1).  In addition, the 3300-MHz flux
density varied by nearly a factor of 2 during 40 min on June 9.1,
suggesting that quasiperiodic oscillations are superposed on the
slower flare variation."

     M. Orio, Turin Observatory and University of Wisconsin; V.
Torroni, BeppoSAX Science Operation Center, Rome; and R. Ricci,
BeppoSAX Science Data Center, Rome, report on behalf of the
BeppoSAX team:  "BeppoSAX observed N Vel 1999 from June 7.622 to
8.538 UT.  Preliminary analysis of the data show that the source is
relatively strong in x-rays with a count rate of 0.15 counts/s in
the two MECS instruments (1.6-10 keV) and 0.05 counts/s in the LECS
instrument (0.1-10 keV), corresponding to a flux at 2-10 keV of
10**-11 erg cm**-2 s**-1.  At a distance of about 2000 pc (Della
Valle and Shore 1999, private communication), this implies a
luminosity about 1.9 x 10**33 erg/s.  The x-ray emission seems to
be thermal and due to hot shocked gas, as in the case of the x-ray
detection of V838 Her, five days after the outburst (Lloyd et al.
1991, Nature 356, 222).  From the LECS/MECS ratio, we find that the
presence of a supersoft component should be relatively small, if
any.  A more detailed spectral analysis will be performed in the
next few days."
     Additional photometry of N Vel 1999 by A. C. Gilmore (cf. IAUC
7179) at Mount John (reference star HD 92518, with assumed V =
6.88, U-B = +0.03, B-V = +0.02, V-R = +0.02, V-I -0.02):  June
6.484 UT, V = 6.06, U-B = -0.96, B-V = -0.03, V-R = +1.20, V-I =

SUPERNOVAE 1999cd AND 1999cf
     R. Szabo reports CCD R magnitude estimates of two supernovae
using the 1-m telescope at Piszkesteto, Hungary (based on USNO-A1.0
R magnitudes):  SN 1999cd in NGC 3646, May 25.944 UT, 17.0; SN
1999cf in UGC 8539, May 25.837, 16.0.

                      (C) Copyright 1999 CBAT
1999 June 9                    (7196)            Daniel W. E. Green

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