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IAUC 7908: 2002dc; SAX J1819.3-2525; 2002db

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                                                  Circular No. 7908
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)

     D. Magee, R. Bouwens, and G. Illingworth, University of
California, Santa Cruz; H. Ford, N. Benitez, J. Blakeslee, N.
Cross, C. Gronwall, and Z. Tsvetanov, John Hopkins University; M.
Clampin and G. Hartig, Space Telescope Science Institute; and the
Advanced Camera for Surveys (ACS) Science Team report the discovery
of an apparent supernova (m_AB = 22.70 +/- 0.15; cf. Oke 1974,
Ap.J. Suppl. 27, 21) in the Hubble Deep Field North (HDFN),
detected in exposures obtained with the Hubble Space Telescope's
ACS (+ F775W filter) on May 11.39 UT.  SN 2002dc is located 0".8
east of the center of the galaxy 2-264.1 [as designated by Williams
et al. (1996, A.J. 112, 1335), who give its position as R.A. =
12h36m49s.756, Decl. = +62o13'13".09 (equinox J2000.0); Cohen et
al. (1996, Ap.J. 471, L5) reported its redshift as 0.475].  The new
object is not present in HST WFPC2 F814W images of the HDFN taken
in Dec. 1995 (10-sigma limiting mag m_AB = 27.60, determined by
Williams et al.).  Tsvetanov, Blakeslee, Ford, Magee, Bouwens,
Illingworth; A. Riess, Space Telescope Science Institute; and the
ACS Science Team further report that SN 2002dc was detected in ACS
HDFN exposures (+ F850LP filter), at m_AB = 23.15 +/- 0.15
(photometric calibration not yet completed), on May 21.17 UT and in
the G800L grism on May 11.52; the grism spectrum is consistent with
that of a type-I supernova (and most likely a type-Ia event) at
this redshift, a month or more after maximum and having well-
developed nebular emission.

SAX J1819.3-2525
     D. Campbell-Wilson and R.W. Hunstead, University of Sydney,
report with the Molonglo Observatory Synthesis Telescope the
detection of a radio counterpart of the x-ray transient SAX
J1819.3-2525 = V4641 Sgr (IAUC 7906).  Short observations on May
21.89 and 22.80 UT (mid-exposure) yielded 843-MHz flux densities of
32 +/- 5 and 133 +/- 4 mJy, respectively, coincident with the
optical position (IAUC 7277).

SUPERNOVA 2002db IN NGC 5683
     S. Nakano, Sumoto, Japan, reports an independent discovery of
SN 2002db (cf. IAUC 7906) by R. Kushida at Yatsugatake South Base
Observatory, who notes unfiltered mag 16.9 and the following
position end figures from a CCD frame taken on May 24.729 UT:
51s.66, 53".3.

                      (C) Copyright 2002 CBAT
2002 May 25                    (7908)            Daniel W. E. Green

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