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IAUC 7831: 2002aw; Aql X-1; V838 Mon

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                                                  Circular No. 7831
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 617-495-7440/7244/7444 (for emergency use only)

     T. Puckett and M. Peoples, Mountain Town, GA, report the
discovery of an apparent supernova (mag 16.6) on an unfiltered CCD
frames (limiting mag 20.0) taken with the Puckett Observatory
0.60-m automated supernova patrol telescope on Feb. 15.39 and 16.47
UT.  SN 2002aw is located at R.A. = 16h37m29s.06, Decl. =
+40o52'50".3 (equinox 2000.0), which is 1".6 west and 1".5 north of
the center of its apparent host galaxy.  S. Nakano, Sumoto, Japan,
reports that a confirming unfiltered CCD image of SN 2002aw (mag
about 15.5, includes part of galaxy) was also obtained by R.
Kushida, Yatsugatake South Base Observatory, on Feb. 16.75; Y.
Kushida provides the following position end figures: 29s.06, 49".0.
The new object was not present on nine images taken by Puckett
from 2000 June 29 to 2001 Sept. 17 (limiting mag about 20.0) or on
Palomar Sky Survey images taken on 1993 Apr. 30, 1989 May 31
(limiting mag about 21.0), and 1953 May 19 (limiting mag about

     J. H. Swank and E. A. Smith, Goddard Space Flight Center,
report:  "Rossi X-Ray Timing Explorer observations indicate that
Aquila X-1 has begun an x-ray outburst.  The ASM reported a level
of 33 mCrab during Feb. 12-15.  On Feb. 15.6 UT, the flux began a
rise at the rate of 8.3 ASM counts/s (122 mCrab) per day.  The PCA
watched as it rose from 75 to 120 mCrab during Feb. 16.03-16.25.
One x-ray burst was observed at the level of 1 Crab.  Additional
RXTE observations are scheduled."

     H. U. Kaeaufl, European Southern Observatory (ESO), reports
that observations by G. Locurto, F. Kerber, B. Heijligers, and
himself with the ESO 3.6-m telescope (+ TIMMI2) yield the following
infrared magnitudes:  Jan. 27.219 UT, [11.9 microns] = 4.38;
28.183, [11.9 microns] = 4.51; 28.195, [8.9 microns] = 4.40;
28.217, [10.4 microns] = 4.70; Feb. 9.125, [11.9 microns] = 2.65;
11.131, [11.9 microns] = 2.93; 11.140, [10.4 microns] = 3.15.  A
low-resolution spectrum (range 8.0-13.3 microns; lambda/Delta(lambda)
about 150) taken on Feb. 9.167 shows a blackbody continuum
corresponding to T about 4500 K and the following lines:  11.3
microns, PAH; 11.6 microns, --; 12.8 microns, [Ne II].  A similar
spectrum obtained on Feb. 11.104 shows a 10-15-percent broad
silicate absorption feature not present in the previous spectrum,
indicating the onset of dust formation around the object, which may
lead rapidly to high extinction at shorter wavelengths (as in V4334

                      (C) Copyright 2002 CBAT
2002 February 16               (7831)            Daniel W. E. Green

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