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IAUC 8077: 2003av, 2003aw; IGR J16320-4751, IGR J16318-4848; R CrB

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                                                  Circular No. 8077
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


SUPERNOVAE 2003av AND 2003aw
     Further to IAUC 8071, W. M. Wood-Vasey, G. Aldering, P.
Nugent, and K. Li report the discovery of two apparent supernova on
unfiltered NEAT images taken with the Palomar 1.2-m Schmidt
telescope.

SN      2003 UT      R.A.  (2000.0)  Decl.    Mag.      Offset
2003av  Feb. 4.28    8 01 32.57  + 2 48 27.9  19.6   3".5 E, 1".2 N
2003aw  Feb. 6.26    9 05 54.79  - 5 36 08.6  17.8   0".2 E, 1" N

Additional magnitudes:  SN 2003av, Jan. 16 UT, [21.0; Feb. 10,
19.5; 18, 19.7; 19, 20.0.  SN 2003aw, Jan. 14, [21.0; Feb. 10,
17.6; 19, 17.8.


IGR J16320-4751 AND IGR J16318-4848
     J. J. M. in 't Zand, Space Research Organization Netherlands;
and P. Ubertini, F. Capitanio, and M. Del Santo, Istituto
Astrofisica Spaziale e Fisica Cosmica, Rome, report on their
analysis of archival BeppoSAX-WFC data.  IGR J16320-4751 = AX
J1631.9-4752 (IAUC 8076) was consistently detected during 1996-2002,
at a flux that varied between 10 and 16 mCrab (5-10 keV; 2-month
averages); with the ASCA detection, this suggests that the source
has been persistently active for at least 8 years.  Based on three
broad channels (2-5, 5-10, and 10-28 keV) and averaged over all
data, an absorbed power model describes the data well with a photon
index of 2.5 +/- 0.3 and N_H = (2 +/- 1) x 10**23 cm**-2.  The
average unabsorbed 0.7-10-keV flux is 4 x 10**-10 erg cm**-2 s**-1.
If the source is a high-mass x-ray binary (cf. IAUC 8076), the
persistently bright emission would be more in line with the mass
donor being a (super)giant than a Be star.  The position in the
combined WFC data is R.A. = 16h32m05s.4, Decl. = -47o52'07"
(equinox 2000.0; 99-percent-confidence error radius 1'.7), which
is 1'.1 from the centroid of AX J1631.9-4752 and 1' from IGR
J16320-4751.  IGR J16318-4848 (IAUC 8063, 8076) was never detected
in any accumulation of WFC data, with an upper limit of 5 mCrab per
visibility window.


R CORONAE BOREALIS
     J. Mattei, AAVSO, reports that R CrB last faded in late Nov.
2000, reaching minimum m_vis = 12.4 (mean maximum m_vis = 6.3 in
Feb. 2001).  Visual magnitude estimates:  2003 Feb. 4.14 UT, 6.2
(A. Baransky, Bucha, Ukraine); 11.12, 6.6 (Baransky); 13.98, 7.0
(K. Hornoch, Lelekovice, Czech Rep.); 15.02, 7.2 (Hornoch);
17.11, 7.8 (Baransky); 21.12, 9.1 (Baransky).

                      (C) Copyright 2003 CBAT
2003 February 21               (8077)            Daniel W. E. Green

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