Supernova 1999gn in M61

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This page is devoted to information on Supernova 1999gn in NGC 4303 (= M61) Basic information on this SN, including the last reported brightness, on this Supernova can be found on the main supernova page. Information on the original web pages for many of these images can be found on the Supernova links web page.

Amateur Alessandro Dimai reported via ISN his discovery of a new star in M61. According to the rules, amateurs need two observations on two different nights to confirm a new supernova. Thus, ISN activated its' "isn_alert" SIG, which puts us in contact with amateur and professional supernova hunters around the world. Within hours, Weidong Li from LOSS had confirmed his observations and it was off to IAU for an official designation.

Web pages dedicated to this SN.

AUDE has a 1999gn page in French [Translate]

SEDS has a Supernova 1999gn page.

AAVSO issued aavso-alert 268 with information on this SN and some very nice finder charts

Seiichi Yoshida has a 1999gn page

Discovery of supernova in M61 in Italian [Translate]

ESA Science story Armchair astronomy - catch a supernova from home? Relinked 7/26/00

Odd Trondal's 1999gn page

Kopernik's M61 and supernova 1999gn page

The following is a list of images of this SN, in chronological order. Click on the name in the "observer" column to see the image. Times and dates are in UT unless otherwise noted. If you know of any others, please tell me!

Observer Date Mag Filter Comments

Alessandro Dimai image 12/17.219/99 C Discovery

CROSS image 12/17.22/99 C color, (tiff version)

Odd Trondal image 12/20.173/99 16.0: C Air turbulent

KenIchi Kadota
Seiichi Yoshida image 12/20/99 1:44 JST 15.7 C

KenIchi Kadota
Seiichi Yoshida image 12/22/99 5:53 JST 15.7 C

Larry Robinson image 12/25/99 C

Arno van Werven image 12/26.349/99 C

Rok Palcic image 12/31/99 C mirror

K. SАrneczky, L. Kiss
K. SzilАdi image 1/1.171/00 16.0 C Big

Ramon Naves image 1/1.850/00 C

Rafael Ferrando image 1/2.140/00 15.5 C

S. Moretti image 1/3.1/00 C

L Brunetto image 1/3/00 14.6 C

Marko Moilanen
Arto Oksanen image 1/9.094/00 C

Arno van Werven image 1/11.401/00 C

Odd Trondal image 1/28.147/00 16.5 C

Ron Wodaski image 1/28/00 C

KenIchi Kadota
Seiichi Yoshida image 1/29/00 2:30 JST 16.2 C

Don Dillinger image 2/10/00 16.3 C

Johannes Walter image 2/12.073/00 C

Odd Trondal image 2/14.0208/00 16.8 C

Stephen M. Brincat image 2/25.935/00 16.2 V

Rafael Ferrando image 2/27.099/00 16: C

KenIchi Kadota
Seiichi Yoshida image 2/29/00 1:21 JST 16.2 C

P Pinel image 3/5.029/00 15.7 C

Fred Ewalt image 3/6.950/00 16.06 C

JM Llapasset image 3/9.926/00 15.4 C

Rafael Ferrando image 3/11.095/00 16: C mirror

Fred Ewalt image 3/24.090/00 15.62 CR

Chris Spratt image 3/31.268/00 C

Kopernik image 4/1.243/00 15.5 C

Tom Davis image 4/5.146/00 C

Chris Spratt image 4/5.213/00 C

JM Llapasset image 4/24.920/00 C

Observer	Date	Mag	Filter	Comments
Alessandro Dimai image	12/17.219/99		C	Discovery
CROSS image	12/17.22/99		C	color, (tiff version)
Odd Trondal image	12/20.173/99	16.0:	C	Air turbulent
KenIchi Kadota Seiichi Yoshida image	12/20/99 1:44 JST	15.7	C
KenIchi Kadota Seiichi Yoshida image	12/22/99 5:53 JST	15.7	C
Larry Robinson image	12/25/99		C
Arno van Werven image	12/26.349/99		C
Rok Palcic image	12/31/99		C	mirror
K. SАrneczky, L. Kiss K. SzilАdi image	1/1.171/00	16.0	C	Big
Ramon Naves image	1/1.850/00		C
Rafael Ferrando image	1/2.140/00	15.5	C
S. Moretti image	1/3.1/00		C
L Brunetto image	1/3/00	14.6	C
Marko Moilanen Arto Oksanen image	1/9.094/00		C
Arno van Werven image	1/11.401/00		C
Odd Trondal image	1/28.147/00	16.5	C
Ron Wodaski image	1/28/00		C
KenIchi Kadota Seiichi Yoshida image	1/29/00 2:30 JST	16.2	C
Don Dillinger image	2/10/00	16.3	C
Johannes Walter image	2/12.073/00		C
Odd Trondal image	2/14.0208/00	16.8	C
Stephen M. Brincat image	2/25.935/00	16.2	V
Rafael Ferrando image	2/27.099/00	16:	C
KenIchi Kadota Seiichi Yoshida image	2/29/00 1:21 JST	16.2	C
P Pinel image	3/5.029/00	15.7	C
Fred Ewalt image	3/6.950/00	16.06	C
JM Llapasset image	3/9.926/00	15.4	C
Rafael Ferrando image	3/11.095/00	16:	C	mirror
Fred Ewalt image	3/24.090/00	15.62	CR
Chris Spratt image	3/31.268/00		C
Kopernik image	4/1.243/00	15.5	C
Tom Davis image	4/5.146/00		C
Chris Spratt image	4/5.213/00		C
JM Llapasset image	4/24.920/00		C

Light curves and Spectra:

VSNET Light curve (requires JAVA).

If you have observations of this Supernova, please send them to vsnet-obs@kusastro.kyoto-u.ac.jp. Use this VSNet data query to see what information has been reported so far. Other VSNet data on this SN:

[vsnet-alert 3835] SN 1999gn in NGC 4303 = Messier 61

[vsnet-chat 2469] Host galaxy of SN1999gn

[vsnet-alert 3842] Spectroscopy of SN 1999gn

[vsnet-alert 3845] T&B sequence for M61

Latest Photometry:

[vsnet-alert 3847] SN1999gn early photometry (update)

[vsnet-alert 3860] SN1999gn rising!

[vsnet-recent 48577] SN1999gn recent (cont'd)

[vsnet-recent 52603] SN1999gn recent (cont'd)

Back to 1999 Supernovae
Back to Bright Supernovae.

David Bishop

Last modified: Wed Jul 18 12:52:31 EDT 2001