[IAUC] CBET 1820: 20090531 : SUPERNOVA 2009ex-2009fh AND POSSIBLE SUPERNOVAE K0905-1, K0905-2, K0905-3
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Dom Mayo 31 13:30:02 ART 2009
Electronic Telegram No. 1820
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2009ex-2009fh AND POSSIBLE SUPERNOVAE K0905-1, K0905-2, K0905-3
Editor's note: This replaces the text on CBET 1819.
Further to CBET 1783, M. M. Kasliwal, California Institute of Technology
-- together with S. R. Kulkarni, R. Quimby, P. E. Nugent, D. A. Howell, J.
Cooke, S. B. Cenko, A. Gal-Yam, N. Law, D. Levitan, E. O. Ofek, and D.
Poznanski -- report the discovery of numerous supernovae in the course of the
"Palomar Transient Factory" survey on R-band images taken during May 15-20
that were compared with reference images obtained during May 5-15. Those
transients that were confirmed via three-filter (g, r, and i) imaging with
the robotic Palomar 1.5-m reflector were spectroscopically classified a few
days later using the Double Beam Spectrograph on the Palomar Hale telescope:
on May 19 for 2009ey, 2009ez, 2009fb, 2009ff, and 2009fe; on May 21
for 2009fh, K0905-3, and 2009fg; and on May 20 for the rest. The type and
phase of the supernovae (days since maximum light) were identified using the
"Superfit" software of Howell et al. (2005): except for 2009fe (type II),
2009ex-2009fh were all found to be type-Ia events, each close to maximum
except for 2009fg and 2009fh (a few days before maximum), and 2009ex
(more than a week before maximum). The discovery observations are
tabulated below, along with the measured redshifts.
SN 2009 UT R.A. (2000.0) Decl. R Offset z
2009ex May 15.220 17 38 26.07 +53 23 00.7 20.2 4".1 E, 1".3 N 0.080
2009ey May 15.236 14 09 16.68 +53 06 12.8 20.6 0".8 W, 0".1 N 0.179
2009ez May 15.259 13 12 54.49 +43 28 35.9 19.8 0".3 E, 0".1 S 0.091
2009fa May 16.198 16 46 42.82 +75 15 28.6 17.7 0".2 S 0.042
2009fb May 17.172 14 50 00.12 +44 55 05.8 19.1 2".5 E, 5".6 N 0.08
2009fc May 17.196 15 27 48.59 +41 35 34.1 19.4 0".2 E, 1".4 S 0.082
2009fd May 17.196 15 29 10.96 +40 47 38.8 20.4 1".0 W, 0".3 S 0.139
2009fe May 17.237 16 47 34.81 +49 50 00.4 18.1 0".2 W, 0".2 S 0.047
2009ff May 17.247 16 33 10.92 +53 05 30.8 20.5 1".0 W, 0".5 S 0.17
2009fg May 20.245 12 54 23.73 +56 43 57.3 20.4 0".2 E, 0".1 N 0.153
2009fh May 20.401 15 44 38.77 +45 47 51.2 20.4 0".1 E, 0".3 S 0.123
Following are the discovery observations for three possible supernovae:
PSN 2009 UT R.A. (2000.0) Decl. R Offset z
K0905-1 May 17.229 14 57 03.10 +49 36 40.8 19.4 -- 0.064
K0905-2 May 17.244 17 36 44.27 +53 40 12.0 20.3 1".4 W, 3".5 S 0.109
K0905-3 May 20.288 14 32 14.64 +54 51 19.5 20.3 3".5 W, 2".2 N 0.123
Limiting red magnitudes from the reference images taken during May 5-15 for
these three possible supernovae: PSN K0905-1, [22.4; PSN K0905-2, [22.1;
PSN K0905-3, [22.0. Spectra of K0905-2, K0905-1, and K0905-3 each have a blue
and mostly featureless continuum and require further spectroscopic follow-up.
Some of the data above revise or add to what was posted originally at website
URL http://www.astronomerstelegram.org/?read=2055, where other information
(including additional magnitudes) is provided for the above fourteen objects
-- together with the discovery on May 17.253 UT of a cataclysmic variable of
mag 20 at R.A. = 15h06m11s.04, Decl. = +53o17'42".7 (equinox 2000.0).
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2009 CBAT
2009 May 31 (CBET 1820) Daniel W. E. Green
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