Central Bureau for Astronomical Telegrams
IAUC 7783: PULSARS IN M62; 2001ic; 2000cl
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Circular No. 7783
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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PULSARS IN M62
B. A. Jacoby and A. M. Chandler, California Institute of
Technology (Caltech); D. C. Backer, University of California,
Berkeley; and S. B. Anderson and S. R. Kulkarni, Caltech, report
the discovery of three new binary millisecond pulsars in the
globular cluster M62 (NGC 6266): "The discovery was made with the
recently commissioned 100-m Green Bank Telescope (GBT). M62 was
observed at a frequency of 1.4 GHz for 4 hr on 2001 Aug. 16 with
the GBT and the Berkeley-Caltech Pulsar Machine (BCPM), a flexible
2x96-channel digital filterbank. Confirmation observations were
carried out during the week of Dec. 4. We searched for pulsars at
the dispersion measure of the three previously known pulsars in the
cluster (D'Amico et al. 2001,
http://xxx.lanl.gov/abs/astro-ph/?0105122). PSR J1701-3006D has a
spin period of 3.418 ms, an orbital period of 1.118 days, and a
minimum companion mass of 0.12 solar mass. PSR J1701-3006E has a
3.234-ms spin period and is orbited by a companion of at least 0.03
solar mass every 0.16 day. PSR J1701-3006F has a 2.295-ms spin
period, an orbital period of 0.2 day, and a minimum companion mass
of 0.02 solar mass. M62 is now the third globular cluster
containing six or more known radio pulsars."
SUPERNOVA 2001ic IN NGC 7503
T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum (range
370-750 nm) of SN 2001ic (IAUC 7770), obtained by P. Berlind on
2001 Dec. 14.08 UT with the Mt. Hopkins 1.5-m telescope (+ FAST
spectrograph), shows it to be a type-Ia supernova about a week
after maximum light. Adopting the NASA/IPAC Extragalactic Database
recession velocity of 13 262 km/s for the host galaxy, the
supernova expansion velocity is about 12 500 km/s for Si II (rest
635.5 nm). The spectral-feature age (cf. IAUC 7774) of SN 2001ic
was 7 +/- 2 days past maximum light.
R. Chornock and A. V. Filippenko, University of California,
Berkeley, report that inspection of uncalibrated CCD spectra (range
330-1000 nm) obtained on Dec. 23 UT with the Keck-I telescope
reveals that SN 2001ic is of type Ia, about a month past maximum
brightness.
SUPERNOVA 2000cl IN NGC 3318
Corrigendum. On IAUC 7782, line 1, FOR he READ she
(C) Copyright 2001 CBAT
2002 January 2 (7783) Daniel W. E. Green
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