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Alert Notice 446 - SUPERNOVA 2011‭fe ‬in M101‭ (‬NGC 5457‭) = ‬PSN J14030581+5416254

SUPERNOVA 2011‭fe ‬in M101‭ (‬NGC 5457‭) = ‬PSN J14030581+5416254

August 26‭, ‬2011


Discovered by‭:  ‬The Type Ia supernova science working group of the‭ ‬ Palomar Transient Factory‭:  ‬Peter Nugent‭, ‬Lawrence Berkeley National‭ ‬Laboratory‭ (‬LBL‭), ‬University of California at Berkeley‭; ‬Mark‭ ‬Sullivan‭, ‬Oxford University‭; ‬David Bersier‭, ‬Liverpool John Moores‭ ‬University‭ (‬LJMU‭); ‬D‭. ‬A‭. ‬Howell‭, ‬Las Cumbres Observatory Global‭ ‬Telescope Network Inc‭., ‬University of California at Santa Barbara‭; ‬Rollin Thomas‭, ‬LBL‭; ‬Phil James‭, ‬LJMU

(An observation of the supernova by Mathew Marulla and Tavi Grenier, SLOOH Canary Islands Observatory, Mt. Teide, was reported in CBET 2792 as an independent discovery. On re-examination by CBAT director Daniel Green of their submission date versus the date of the posting of the supernova candidate to the Transient Objects Confirmation Page, he reversed his initial interpretation of their observation as an independent discovery.)

Discovery Date‭:  ‬2011‭ ‬Aug‭. ‬24‭ ‬UT

Discovery Magnitude‭:  ‬magnitude 17.2‭ (‬g-band‭, ‬calibrated with‭ ‬respect to the USNO catalog‭)‬

Position
‭:  ‬RA‭ = ‬14:03:05.81‭   ‬Dec‭ = +‬54:16:25.4‭  (‬J2000‭)‬

Spectra‭:  ‬A preliminary spectrum obtained on 2011‭ ‬Aug‭. ‬24‭ ‬UT using FRODOSPEC on the Liverpool Telescope indicates that SN 2011fe ‬is‭ ‬probably a Type Ia supernova at a very early phase‭. ‬Broad absorption‭ ‬lines‭ (‬particularly Ca II IR triplet‭) ‬are visible‭, ‬and an H-alpha‭ feature is not seen‭.‬

Observations reported to the AAVSO
‭:‬
Observations reported to the AAVSO:
2011 Aug 25.0927 UT, 14.890 V +/- 0.07 (J. Roe, Wentzville, MO);
Aug 25.1297, 14.79 V +/-0.02 (S. Howerton, Arkansas City, KS);
Aug 25.1467, 15.149 B +/- 0.028 (R. Sabo, Bozeman, MT);
Aug 25.1520, 14.789 V +/- 0.014 (Sabo);
Aug 25.1554, 14.657 CV +/-0.01 (R. Koff, Bennett, CO);
Aug 25.1566, 14.706 CV +/-0.01 (Koff);
Aug 25.1589, 14.683 CV +/-0.01 (Koff);
Aug 25.1601, 14.690 CV +/-0.01 (Koff);
Aug 25.1612, 14.657 CV +/-0.01 (Koff);
Aug 25.1624, 14.681 CV +/-0.01 (Koff);
Aug 25.1636, 14.685 CV +/-0.01 (Koff);
Aug 25.1874, 14.593 CV +/-0.01 (Koff);
Aug 25.1887, 14.654 CV +/-0.01 (Koff);
Aug 25.200, 14.9 (J. Brimacombe, Cairns, Australia, CBET 2792);
Aug 25.2000, 14.7 (R. Royer, Springville, CA);
Aug 25.8188, 13.93 V +/-0.05 (R. Novak, Brno, Czech Reublic);
Aug 25.8233, 13.97 V +/-0.04 (Novak);
Aug 25.8294, 13.87 V +/-0.06 (Novak);
Aug 25.83, 13.8 B +/-0.3 (K. Sarneczky, Konkoly Observatory, Hungary, CBET 2792);
Aug 25.83, 13.8 V +/-0.3 (Sarneczky, CBET 2792);
Aug 25.83, 13.9 R +/-0.3 (Sarneczky, CBET 2792);
Aug 25.8342, 13.89 V +/-0.05 (Novak);
Aug 25.8391, 13.97 V +/-0.06 (Novak);
Aug 25.8441, 13.87 V +/-0.06 (Novak);
Aug 25.8492, 13.82 V +/-0.06 (Novak);
Aug 25.853, 13.4 (G. Masi, Virtual Telescope robotic facility, Ceccano, Italy, CBET 2792);
Aug 25.8541, 13.86 V +/-0.06 (Novak);
Aug 25.8592, 13.80 V +/-0.06 (Novak);
Aug 25.8642, 13.89 V +/-0.06 (Novak);
Aug 25.8693, 13.93 V +/-0.06 (Novak);
Aug 25.8744, 13.79 V +/-0.06 (Novak);
Aug 25.8793, 13.85 V +/-0.06 (Novak);
Aug 25.8819, 14.0 (P. Steffey, Daytona Beach, FL);
Aug 25.8844, 13.85 V +/-0.06 (Novak);
Aug 25.8893, 13.86 V +/-0.07 (Novak);
Aug 25.8943, 13.93 V +/-0.06 (Novak);
Aug 25.8995, 13.84 V +/-0.07 (Novak);
Aug 25.9044, 13.81 V +/-0.07 (Novak);
Aug 25.9093, 13.73 V +/-0.08 (Novak);
Aug 25.9142, 13.83 V +/-0.08 (Novak);
Aug 25.9190, 13.98 V +/-0.08 (Novak);
Aug 25.9239, 13.89 V +/-0.08 (Novak);
Aug 25.9278, 13.81 V +/-0.015 (E. Mullyaert, Oostende, Belgium);
Aug 25.9290, 13.87 V +/-0.08 (Novak);
Aug 25.9379, 13.83 V +/-0.04 (N. Stritof, Ljubljana, Slovenia);
Aug 25.9379, 14.08 B +/-0.10 (Stritof);
Aug 26.0295, 13.54 V +/-0.21 (Novak);
Aug 26.0540, 13.66 R +/-0.08 (M. Richmond, Pittsfield, NY);
Aug 26.0600, 13.75 V +/-0.08 (Richmond);
Aug 26.0764, 13.66 V +/-0.02 (H. Smith, East Lansing, MI);
Aug 26.0799, 14.12 B +/-0.02 (Smith);
Aug 26.0800, 13.63 I +/-0.11 (Richmond);
Aug 26.0840, 13.68 I +/-0.03 (Smith);
Aug 26.0960, 14.05 B +/-0.12 (Richmond);
Aug 26.1424, 13.923 B +/-0.037 (Sabo);
Aug 26.1509, 13.712 V +/-0.009 (Sabo);
Aug 26.1965, <13.4 (L. Wade, Belzoni, MS);
Aug 26.8747, 13.118 V +/-0.032 (M. Rodriguez Marco, Madrid, Spain);

Charts‭:  ‬Finder charts for SN 2011‭fe (‬AUID 000-BKD-525‭) ‬may be‭ ‬plotted by entering the name or the coordinates above into VSP‭:  ‬http‭://‬www.aavso.org/vsp

Reporting Observations‭
:  ‬Please report all observations to the‭ ‬AAVSO International Database as SN 2011‭fe.‬

Notes‭:‬
a‭. ‬Initially announced in ATEL‭ #‬3581‭ (‬Peter Nugent et al‭.), ‬AAVSO‭ ‬Special Notice‭ #‬250‭ (‬Matthew Templeton‭), ‬and Central Bureau for‭ Astronomical Telegrams ‬Electronic Telegram 2792‭ (‬Daniel W‭. ‬E‭. ‬Green‭, ‬ed‭.).‬

b‭. ‬According to Green‭, ‬the object was designated‭ ‬ PSN J14030581+5416254‭ ‬when posted on the Central Bureau for‭ ‬Astronomical Telegrams‭' ‬Transient Objects Confirmation Page‭ (‬TOCP‭) ‬webpage‭, ‬and was designated SN 2011‭fe ‬based on spectroscopic‭ ‬reports‭.‬
‭ ‬
c‭. ‬Nothing was visible down to magnitude 20.6‭ ‬at this position on‭ ‬Palomar Transient Factory images taken on 2011‭ ‬Aug‭. ‬23‭ ‬UT‭.‬

d. Image by Marulla and Grenier posted at website URL:
http://admin.slooh.com/files/m101_position.png).
Image by J. Brimacombe posted at website URL:  
http://www.flickr.com/photos/43846774@N02/6079812340/).
Image by G. Masi posted at website URL:
http://antelopehillsobservatory.org/SNpictures/PSNJ14030581+5416254final.jpg.

Congratulations to Peter Nugent‭, ‬Mark Sullivan‭, ‬David Bersier‭, ‬D.A‭. ‬Howell‭, ‬Rollin Thomas‭, ‬and Phil James on their discovery‭!‬

This AAVSO Alert Notice was compiled by Elizabeth O‭. ‬Waagen‭.‬
‭---------------------------------------------------‬
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