SN1999bw in NGC 3198, 05/03/99, jpeg, 17k

POSSIBLE SUPERNOVA IN NGC 3198
     W. D. Li, University of California at Berkeley, on behalf of the Lick Observatory Supernova Search (cf. IAUC 6627, 7126),
reports the discovery on unfiltered CCD images taken on Apr. 20.2 UT with the 0.8-m Katzman Automatic Imaging Telescope (KAIT) of a variable star (mag about 17.8) near NGC 3198.  Inspection of earlier images taken by KAIT reveals that the object was clearly present on Apr. 15.2 (mag about 18.4) and 19.2 (mag about 18.0).
The new object is located at R.A. = 10h19m46s.81, Decl. = +45o31'35".0 (equinox 2000.0), which is about 85".8 west and 83".8 south of the nucleus of NGC 3198.  KAIT images of the same field on Apr. 3.2 (limiting mag about 17.5), Mar. 29.2 (limiting mag about 17.5), and Mar. 24.2 (limiting mag about 19.0) showed nothing at the position of the new object.  SN 1966J, one of the prototype-Ib supernovae, also occurred in NGC 3198 and had a peak magnitude of B = 11.2.

The designation shows, that this SN is dated earlier than the one above, but it stand to far south in the sky to be imaged from my home site. During my holidays I stayed in France and it was possible to take this image.

  SN1999br in NGC 4900, 05/16/99, Newton 8" f/4.6, jpeg, 6k
 

The original announcement for this SN from IAU-Circular 7141 follows below:

SUPERNOVA 1999br IN NGC 4900
     J. Y. King, University of California at Berkeley, reports the discovery of an apparent supernova during the course of the Lick
Observatory Supernova Search (cf. IAUC 6627, 7126) with the 0.8-m Katzman Automatic Imaging Telescope (KAIT).  SN 1999br was
discovered and confirmed on unfiltered images taken on Apr. 12.4 and 13.2 UT (both with mag about 17.5).  The new object is located
at R.A. = 13h00m41s.80, Decl. = +2o29'45".8 (equinox 2000.0), which is about 40" east and 19" south of the nucleus of NGC 4900.  A KAIT
image of the same field on Jan. 6.6 (limiting mag about 18.5) shows nothing at the position of the supernova.  There is a bright
foreground star (mag about 11.3) located 12".5 west and 15".6 south of SN 1999br.

Faint galaxy and bright supernova.

  SN1999bg in Ic758, 05/16/99, 8 f/4.6, jpeg, xk

The original announcement for this SN from IAU-Circular 7135 follows below:

SUPERNOVA 1999bg IN IC 758

W. Li, University of California at Berkeley, reports the discovery of an apparent supernova by the
Lick Observatory Supernova Search (LOSS; cf. IAUC 6627, 7126) with the 0.8-m Katzman
Automatic Imaging Telescope (KAIT). SN 1999bg was found and confirmed on unfiltered CCD
frames taken on Mar. 28.3 and 29.3 UT (mag about 15.5 on both dates). The new object is located
at R.A. = 12h04m07s.30, Decl. = +62o30'01".2 (equinox 2000.0), which is about 33" west and 20"
south of the nucleus of IC 758. A KAIT image of the same field on Feb. 28.4 (limiting mag about
18.0) showed nothing at the position of SN 1999bg.
 

This bright SN in NGC 2841 was an easy target.

  SN1999by in NGC 2841, 05/17/99, Newton 8" f/4.6, jpeg, 10k

The original announcement for this SN from IAU-Circular 7156 follows below:

SUPERNOVA 1999by IN NGC 2841
     A new apparent supernova has been reported independently by R.Arbour, South Wonston, Hampshire, England, and by the Lick
Observatory Supernova Search (LOSS; cf. IAUC 6627, 7126).  On behalf of LOSS, M. Papenkova, W. D. Li, and A. V. Filippenko,
University of California at Berkeley, report that SN 1999by was found and confirmed on unfiltered CCD images taken with the 0.8-m
Katzman Automatic Imaging Telescope (KAIT) on Apr. 30.2 (mag about 15.7) and May 1.2 UT (mag about 15.0).  Arbour's unfiltered CCD discovery image (limiting mag about 17.5), taken on Apr. 30.8749 with a 0.3-m f/6.3 Schmidt-Cassegrain reflector in the course of
his supernova patrol, yields an estimate of the new star's magnitude to be 15.1 and its offset to be 96" west and 86" north of the center of NGC 2841.  Arbour forwards the following position obtained by M. Armstrong from an image obtained on Apr. 30.904: R.A. = h21m52s.07, Decl. = +51o00'06".6 (equinox 2000.0). Papenkova et al. provide position end figures 52s.18, 07".2, which is about 100" west and 91" north of the galaxy nucleus; they add that there is a bright star (mag about 11.1) located 11".7 west and 29".5 north of the supernova.  A KAIT image of the same field on Apr. 25.2 (limiting mag about 19.3) showed nothing at the position of the new star.  Arbour found a prediscovery image taken on Apr. 28.8786 that shows SN 1999by at mag about 16.0-16.5, though the supernova was not visible on images taken on Apr. 10, 14, 22, 23, or 27 (limiting mag about 17.5).  Papenkova et al. note that NGC 2841 is a well-known Sb galaxy and the host of three past supernovae (1912A, 1957A, 1972R), and they urge spectroscopic and photometric observations for this early and potentially bright supernova.

More on this SN-Page of David Bishop
 

Comments welcome, contact: