The Discovery Image:


Here is the official report we filed with the IAU:

T. Puckett, Mountain Town, GA, A. Sehgal, Woodinville, WA,
report their discovery of an apparent supernova (mag 16.9) on an 

unfiltered CCD frame (limiting mag 20.5) taken with the Puckett Observatory 

0.60-m automated supernova patrol telescope on May. 9.23 UT. The candidate 

is located at R.A. = 15h52m56s.19, Decl. = +65o56'12".7 (equinox 2000.0), 

which is 3".06 east and 4".3 north of the center of MCG +11-19-25 . The new
object was also present on an unfiltered CCD frame taken on May
10.05, but it was not present on a frame taken on 2000 Mar. 7.36 --
nor does candidate appear on a Palomar Sky Survey images taken on
1994 Jun. 1 (limiting mag about 21.0) or 1955 May 17 (limiting
mag about 20.0).

Image available to aid observers at:
The candidate is located at R.A. = 15h52m56s.19, Decl. = +65o56'12".7
(equinox 2000.0), which is 571".80 east and 25".2 south of star GSC 4188:512
R.A. = 15h52m18s.07, Decl. = +65o56'37".9 (equinox 2000.0),

Astrometric Positions:

SN                    15 52 56.19 +65 56 12.7        
GX                    15 52 55.69 +65 56 08.4         
GSC 4188:512   15 52 18.07 +65 56 37.9

The official IAU Circular:


The follow up spectrum report:

SUPERNOVA 2000cf IN MCG +11-19-25
S. Jha, P. Challis, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum of SN 2000cf (cf.
IAUC 7421), taken by M. Calkins on May 11.33 UT with the F. L.
Whipple Observatory (FLWO) 1.5-m telescope (+ FAST spectrograph),
shows it to be a type-Ia supernova just past maximum light. The
spectrum exhibits a blue continuum with broad Si II, S II, Mg II,
Fe II, and Ca II features. Cross-correlation of the host-galaxy
spectrum with an emission-line template yields a recession velocity
of 10 920 +/- 20 km/s for MCG +11-19-25. The supernova expansion
velocity, measured with the Si II (rest 635.5 nm) profile, is 9300
km/s. The age of the supernova, based on its spectral features
(Riess et al. 1997, A.J. 114, 722), is 5 +/- 3 days after maximum

Here is the discovery sequence:

The original image in the scan set was shot on the 7th of March at the Puckett Observatory:


The discovery image was take on the morning of May 9th 2000:


The confirming images were shot at astronomical twilight in Georgia by Tim Puckett: