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THE ASTRONOMER Electronic Circular No 2378      2007 Sep 20 16.20UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074
INTERNET: GUY@TAHQ.DEMON.CO.UK      Backup: gmh@wdcc1.bnsc.rl.ac.uk
WORLD WIDE WEB                         http://www.theastronomer.org
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SUPERNOVAE 2007hq, 2007hr, 2007hs, 2007ht
Further supernova discoveries by The "Nearby Supernova Factory" 
collaboration. The R-band discovery magnitudes and astrometry were 
derived from comparison with the USNO-B1.0 catalogue (CBET 1054):
SN       2007 UT       R.A. (2000.0) Decl.      Mag.    z      Type
2007hq   Sept. 1.3    0 10 06.68  -16 16 24.3   19.7   0.09    Ia
2007hr   Sept. 1.5    4 12 07.14  - 7 35 13.2   18.6   0.03    II
2007hs   Sept. 2.2   17 11 40.31  +36 30 03.7   19.4   0.07    II
2007ht   Sept. 2.3    0 34 33.81  - 1 13 03.1   19.2   0.07    Ia

SUPERNOVA 2007hu IN NGC 6261
Discovery by A. Sehgal and T. Puckett (USA) of a possible supernova 
(CBET 1056):
SN      2006 UT      R.A.  (2000.0)  Decl.    Mag.     Offset
2007hu  Sep  9.09   16 56 29.96  +27 58 40.4  17.7    1.3"W, 1.4"N
Giovanni Sostero reports a magnitude of 17.3 on Sept 9.9.
Reddened type Ia after maximum light (S. Blondin).

SUPERNOVA 2007hv IN UGC 2858
Discovery by A. Sehgal and T. Puckett (USA) of a possible supernova 
(CBET 1056):
SN      2006 UT      R.A.  (2000.0)  Decl.    Mag.     Offset
2007hv  Sep. 9.37   03 47 23.90  +45 58 13.2  18.1    9.4"E,22.7"N
Type II 1-2 weeks past explosion (S. Blondin)

SUPERNOVAE 2007hw-2007ie
Sloan Digital Sky Survey (SDSS) II collaboration, report the discovery 
of nine supernovae (CBET 1057);
SN       Discov.       R.A. (2000.0) Decl.     Mag.  Tyoe Peak Date
2007hw   Sept. 3     2 03 35.16  + 0 47 10.3   20.4  II
2007hx   Sept. 3     2 06 27.08  - 0 53 58.3   19.5  Ia
2007hy   Sept. 3     3 39 42.33  + 1 05 32.2   20.9  Ia
2007hz   Sept. 3    21 03 08.95  - 1 01 45.1   19.7  Ia
2007ia   Sept. 4     3 43 10.06  + 0 06 08.9   20.0  Ia
2007ib   Sept. 4    23 15 44.56  + 0 27 25.6   20.4  II
2007ic   Sept. 5     0 05 57.98  + 1 06 11.1   20.0  Ia
2007id   Sept. 5    21 46 00.49  - 1 13 03.9   20.2  Ia
2007ie   Sept. 5    22 17 36.69  + 0 36 48.0   20.1  Ia?

SUPERNOVA 2007if (SUPER-CHANDRASEKHAR-MASS)
ROTSE collaboration, reported the discovery of a variable object (mag 
19.5) in Pisces on unfiltered CCD images taken on Aug. 16.29 UT with the 
0.45-m ROTSE-IIIb telescope at McDonald Observatory. The new object is 
located at:
RA 01h 10m 51.37s DEC+15 27' 39.9" (2000).
No object (including a possible host galaxy) is seen at this position in 
the Sloan Digital Sky Survey images, a Digitised Sky Survey image, or 
any USNO archive plates.
A spectrum was taken with the MDM 2.4-m telescope by C. Peters and J. 
Thorstensen (Dartmouth College) of Aug 22.4 UT but the nature was 
inconclusive. Yuan and Quimby et. al., report that the variable is 
spectroscopically similar to the possibly "super-Chandrasekhar-mass" 
type-Ia supernova 2003fg. Assuming z = 0.07 and the magnitudes reported 
as bright as mag 17, it is noted that 2007if is clearly overluminous 
(absolute magnitude M < -20) for a type-Ia supernova, agreeing well with 
the spectroscopic results and suggesting a "super-Chandrasekhar-mass" 
event. (CBET 1059)
Guy M Hurst