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IAUC 7429: V1333 Aql; 2000ce

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                                                  Circular No. 7429
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)

     R. Jain, C. Bailyn, and P. Coppi, Yale University; M. Garcia,
Harvard-Smithsonian Center for Astrophysics; A. Levine,
Massachusetts Institute of Technology; J. Orosz, Utrecht
University; P. Lu, Western Connecticut State University; and J.
Espinoza and D. Gonzalez, Cerro Tololo Interamerican Observatory
(CTIO), report YALO consortium observations:  "The optical outburst
of V1333 Aql = Aquila X-1, which began on May 11.23 UT (IAUC 7423),
did not develop into a full outburst.  By May 17.25, the object was
back to quiescence.  The peak amplitude of the outburst was 0.34
+/- 0.02 mag brighter than the quiescent mean in R and occurred on
May 12.37.  Two observations with the PCA instrument on RXTE
lasting 1500 and 2500 s were taken on May 14.38 and 16.91,
respectively.  There is an indication that the source was detected
with the PCA, but the count rates were heavily background-dominated
and low enough that preliminary analysis does not allow a
definitive determination of the flux.  We therefore quote an upper
limit of 4 x 10**-11 erg cm**-2 s**-1 (2.5-20 keV).  A similar
truncated 'mini-outburst' also occurred in Sept. 1998 (IAUC 7017,

SUPERNOVA 2000ce IN UGC 4195
     K. Krisciunas and A. Rest, University of Washington, report
preliminary photometry obtained by Rest, R. McMillan, and N. C.
Hastings using the Apache Point Observatory 3.5-m telescope (and
software aperture of diameter 4".5):  May 11.12 UT, V = 16.92, B-V
= +0.74, V-R = +0.35, V-I = +0.33 (uncertainties +/- 0.03 mag).  On
May 20.12, V = 17.45 +/- 0.03, B-V = +1.15 +/- 0.07, V-R = +0.39
+/- 0.04, V-I = +0.63 +/- 0.04 (software aperture of diameter 5".6).
On May 11.25, they found infrared magnitudes J = 16.65 +/- 0.07, H
= 15.85 +/- 0.07, K = 15.99 +/- 0.10 (software aperture of diameter
5".7; sky annulus of radius 5".7-9".5).  They add:  "If the
estimated time of maximum light (IAUC 7422) of May 4 is correct and
this object's V-minus-near-infrared color evolution is similar to
the supernovae studied by Krisciunas et al. (1999,
http://xxx.lanl.gov/abs/astro-ph/?9912219), then the extinction
along the line-of-sight to this object is A_V about 2.3 mag, which
would explain the red B-V color so soon after maximum."
     Additional CCD R magnitude estimates by K. Hornoch,
Lelekovice, Czech Republic (cf. IAUC 7424):  May 12.837 UT, 16.2;
13.845, 16.1; 14.846, 16.2; 15.848, 16.3; 23.857, 16.2.

                      (C) Copyright 2000 CBAT
2000 May 24                    (7429)            Daniel W. E. Green

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