List of objects for April, 23/24 and 24/25 observations

 

object

Type

coordinates

last mag

comments

Priority

from March, 5 targets list

SN 2009ao (disc. 2009/02/04.12)

IIP

09:38:08.54

+09:31:00.7

16.6CR (Apr, 13.852)

Spectra (range 402.7-1011 nm, Mar. 16.1-16.2): SN 2009ao is a young type-IIP supernova around a week past explosion; adopting a host-galaxy recession velocity of 3339

km/s (Chengalur et al. 1993, Ap.J. 419, 30) for the host galaxy (NGC 2939), H_beta is measured to be blue-shifted by roughly 8000 km/s. (CBET#1725)

 

?

SN 2009ar = CSS090219:095526-012821 = 'css2'

(discovered 2009/02/19)

 

IIb

09:55:25.71

-01:28:21.3

20.3R (Mar, 06.35) FAINT OBJECT!

The presumed host galaxy to 2009ar, SDSS J095525.67-012821.0, has Gunn magnitudes

u = 23.2,

g = 21.7,

r = 21.5,

i = 21.6,

z = 21.9.

SN 2009ar is a type-IIb supernova at z = 0.026 and is most like SN 1996cb at one day past maximum (Feb, 25).

?

[OI],

phase ~ 70 days.

look 2008ApJ...687L...9M

SN 2009Z (disc 2009/02/02.53)

II-pec?

1993J - like

14:01:53.6

-01:20:30.2

17.25R (Mar, 25)

Stritzinger, Morrell, and M. Phillips (also LCO) add that they have obtained spectra (range 403-1011.2 nm) of 2009Z (cf. CBET 1685) on Feb. 11.1 and 15.1 with the 6.5-m Magellan I (BAADE) telecope (+ IMACS). Cross-

correlation with SNID shows these spectra to be most similar to those of SN

1993J at two days before and three days after maximum, respectively.

?

deep field

of GRB030226

 

11:33:04.9

+25:53:55.6

 

discovery of cosmological SNe using substracting of previously observed field of GRB030226

excluded

from April,3 targets list

SN 2009bw (discovered Mar, 27.871)

II

03:56:06.92

+72:55:40.9

(low)

14.8CR (Apr,16.863)

from CBET#1746:

but, in addition, H_alpha shows a narrow emission component at the host-galaxy redshift (1155 km/s; Schneider et al. 1992, Ap.J. Suppl. 81, 5)

?

to obtain the second our spectrum.

SN 2009ba (discovered Mar, 21.18)

?

09:59:01.92

+17:49:00.1(good; first part of night)

March, 29: R~18.8

 

?

SN 2009az (discovered Mar, 20.30; close to host nuclei)

I?

10:55:56.22

+36:51:43.0(good, high; first part of night)

faint, >19

 

?, possibly no cause of close host nuclei

2009by (discovered Mar, 29.28)

 

II or IIn

(CBET#1756)

11:13:56.22+4:17:58.5 (good; first part of night)

18.1R (April, 3)

not observed in SAO yet!

?

SN 2008in (disc. 2008 Dec, 26.79)

IIP

12:22:01.77+04:28:47.5(normal altitude, first part of night)

still bright

observed on April, 3/4

?

proposed by R.Roy

CSS090319:125916+271641 = 090319d = SN 2009cb (disc Mar, 19.408)

?

12:59:15.85

+27:16:41.3 (good, high)

19.8R (Mar, 29.99)

FAINT

type determ.

possibly, no

CSS090317:140750+363837=090317a = SN 2009bp (disc Mar, 17.50)

Ia

14:07:49.75

+36:38:37.1

(good, high)

>19

A. Drake wrote: I would avoid following Ia's like CSS090317:140750+363837 and CSS090319:142155+260102

?,

all range spectrum, host spectrum

CSS090319:142155+260102=090319c = SN 2009db (disc Mar, 19.408)

Ia

14:21:54.63

+26:01:02.0

(good, high)

18.55R (Apr, 4)

A. Drake wrote: I would avoid following Ia's like CSS090317:140750+363837 and CSS090319:142155+260102

?

all range spectrum, host magnitude

SN 2009bz (disc Mar, 29.48)

II

15:19:26.04

+11:03:30.1 (good;

second part of night)

16.9 (2009/03/29.48)

 

?

monitoring

CSS090319:152356-081918=090319b = SN 2009br (disc Mar, 19)

 

?

15:23:56.14

-08:19:18.3

(low)

18.2R (Mar. 21.32)

~19 (now)

 

?

type determ.

SN 2009ay (disc Mar, 20.41)

II

17:48:22.97

+54:08:54.7

(good;

second part of night)

15.8CR (Apr, 16.962)

(standards by Tsvetkov, squares)

?

monitoring

will be observed by Stefano Benetti

SN 2009dc (disc Apr, 9)

Ia

15:51:12.12 +25:42:28.0

~16.5

 

?

Ia-type

SN 2009bw (see uper)

II

03:56:06.92

+72:55:40.9

(low, z=55)

14.8CR (2009/04/16.863)

 

?

SN 2009cz (disc Apr, 6)

Ia

09:15:00.02 +29:44:07.1

~17.9

 

?

Ia-type

SN 2009dd

II

12:05:34.1

+50:32:19.4

(good, high)

13.5

 

?

SNe from Stefano Benetti's web-site http://web.oapd.inaf.it/supern/followup/

SN 2009at (disc Mar, 11.633)

II

13:46:26.68

+46:06:09.1 (good, high)

15.7C (2009/04/14.880)

Stefano wrote about it's site at the letter

?

SN 2009E (disc Jan 03; old)

II

12:09:49.56

+58:50:50.3

good, high; first half of night

16.2CR (2009/04/16.984)

Stefano wrote about it's site at the letter

?

Newly discovered objects

2009dm (discovered Apr, 19.24)

II or IIP

near max.

11:30:20.14 +44:09:49.2

17.5C (Apr., 19.24)

A narrow H_alpha emission component

corresponds with a SNID calculated z=0.024.The expansion

velocity deduced from the H_alpha absorption is about 9200 km/s (Apr.,21.2)

 

 

?

2009dn (discovered Apr, 11)

CLOSE TO NUCLEI

?

close to max

11:37:39.33

+46:57:11.3

Apr., 7 >18.3C

17.5C (Apr., 11,12,14,15,16)

16.9C (Apr., 20.17)

 

?

SN 2009de (disc Jan, 2; old)

Ic?

 

13:00:37.49 +17:50:57.0

 

19.5C (Apr, 19.2)

 

?

proposed by Andrew Drake

CSS090417:095440+191113 (disc Apr,17)

?

 

09:54:40

+19:11:13

r-i=0

To avoid Ia's I would suggest not following anything with gunn colours r-i < -0.3 (A. Drake)

?

CSS090418:081414+242340 (disc Apr,18)

?

08:14:14 +24:23:40

r-i=-0.26

 

?

CSS090421:133609+340319 (disc Apr,21)

?

13:36:09

+34:03:19

r-i=?

 

?

CSS080928:160837+041627 (discovered 2008/09/28)

 

 

 

 

 

IIn

16:08:37.23

+04:16:26.7

Mar, 21 17.6C

 

Finally, as you may have seen in our recent ATel,
CSS080928:160837+041627 may be of interest to you as
it is a type IIn that has been bright for >500 days

?

 

 

 

 

 

 

also look at non-classif. SN-candidates at http://nesssi.cacr.caltech.edu/catalina/AllSN.html

 

 

SUPERNOVA 2009by IN UGC 6260

K. Konishi, Y. Ihara, and K. Tokita, University of Tokyo; N. Morimoto,

Tohoku University; and T. Hattori, National Astronomical Observatory of Japan,

report that a spectrogram (range 370-900 nm) of 2009by (cf. CBET 1748),

obtained on Apr. 4.28 UT with the 8.2-m SUBARU Telescope (+ FOCAS), shows it

to be a type-II supernova. Their recently-developed identification code

suggests that the spectrum is best fitted to that of the type-IIP supernova

1999em at five days after the explosion (Elmhamdi et al. 2003, MNRAS 338,

938). There are narrow emission-line components of H_alpha and H_beta,

corresponding to z = 0.021 +/- 0.001; it is unclear whether these narrow

components originate from the H II region of the host galaxy or are intrinsic

to the supernova. Thus, it the possibility cannot be excluded that this

supernova is of type IIn.

 

 

NOTE: These 'Central Bureau Electronic Telegrams' are sometimes

superseded by text appearing later in the printed IAU Circulars.

 

2009 April 6 (CBET 1756) Daniel W. E. Green

 

all coordinates:

09bw 03:56:06.92 +72:55:40.9

09ba 09:59:01.92 +17:49:00.1

09az 10:55:56.22 +36:51:43.0

09by 11:13:56.22 +4:17:58.5

08gz 11:25:03.24 -09:47:51.0

08in 12:22:01.77 +04:28:47.5

 

09cb 12:59:15.85 27:16:41.3

17a 14:07:49.75 36:38:37.1

19c 14:21:54.63 26:01:02.0

09bz 15:19:26.04 +11:03:30.1

19b 15:23:56.14 -08:19:18.3

09ay 17:48:22.97 +54:08:54.7

 

09dc 15:51:12.12 +25:42:28.0

09cz 09:15:00.02 +29:44:07.1

09dd 12:05:34.1 +50:32:19.4

09at 3:46:26.68 +46:06:09.1

09E 12:09:49.56 +58:50:50.3

 

09dm 11:30:20.14 +44:09:49.2

09dn 11:37:39.33 +46:57:11.3

09de 13:00:37.49 +17:50:57.0

0417 09:54:40 +19:11:13

0418 08:14:14 +24:23:40

0421 13:36:09 +34:03:19

0928 16:08:37.23 +04:16:26.7

Unusual CRTS Transient

ATel #1768; A.J. Drake, A. Mahabal, S.G. Djorgovski, R. Williams, M.J. Graham (Caltech); E.C. Beshore, S.M. Larson (LPL; M. Catelan (PUC); E. Christensen (Gemini Observatory); E. Christensen (Gemini Observatory); E.C. Beshore, S.M. Larson (LPL/UA)
on
7 Oct 2008; 23:51 UT
Password Certification: Andrew J. Drake (ajd@cacr.caltech.edu)

Subjects: Optical, Request for Observations, Transients, Variables
Referred to by ATel #:
2010

We have detected an optical transient of unknown nature in Catalina 0.7m Schmidt telescope images from 28 Sep 2008 UT. The object has the following parameters:

CSS080928:160837+041626

2008-09-28 UT 02:50:49

RA 16:08:37.23

Dec 04:16:26.7

Mag 17.7

Type ?

A possible uncataloged match to the transient is present in SDSS images with magnitude r~22.5. The transient is visible in Catalina images dating back to Sep 13th 2007 and is gradually brightening suggesting the transient may be distant, high amplitude (~5 mags), long period variable. However, the object is not seen in archival DSS1 and DSS2, 2MASS, or PQ images covering this location. Furthermore, follow-up photometry taken with the Palomar 60" telescope on Sep. 29.12 UT gives g=18.3, g-r=1.0, r-i=-0.5 and g=18.1, g-r=0.7, r-i=-0.32 on Oct 10.12. The r-i colours fall far from the stellar locus and the colours expected for long period variables. Further follow-up is requested.

For finding charts and discovery images please see: http://voeventnet.cacr.caltech.edu/feeds/ATEL/CRTS.
CRTS optical transients are detected and published as VOEvents in real-time at
http://voeventnet.org/feeds/Catalina.shtml and in RSS here http://voeventnet.caltech.edu/feeds/Catfeed.xml

CRTS Discovery of a very energetic Type IIn Supernova

ATel #2010; A..A. Mahabal, A.J. Drake, S.G. Djorgovski, M.J. Graham, R. Williams, W. Max-Moerbeck (Caltech); M. Catelan (PUC, Chile); E.C. Beshore, S.M. Larson, A. Gibbs, R. Kowalski, A. Boattini, R. Hill (LPL/UA); E. Christensen (Gemini Observatory); V. Mohan, A.N. Ramaprakash, A.K. Kembhavi (IUCAA);
on
10 Apr 2009; 22:45 UT
Distributed as an Instant Email Notice (Request for Observations)
Password Certification: Ashish Mahabal (aam@astro.caltech.edu)

Subjects: Optical, Novae, Supernovae, Transients

The Catalina Real-time Transient Survey (CRTS) has spectroscopically characterized CSS080928:160837+041626 (ATel 1768) as a Type IIn SN at z~0.041 using the SMARTS 1.5m telescope using Observations taken on March 27th UT with the following results:

ID

RA

Dec

Type

z

Disc. ATel

CSS080928:160837+041626

16:08:37.23

04:16:26.7

IIn

0.041

ATEL#1768

The object was first marked as a transient by CRTS on 2008-09-28 (unfiltered mag=17.7). It was also present in the 2007-09-13 images, but blended with the brighter star nearby and hence not detected as a transient. Palomar-Quest images from 2007-02-24 do not reveal the presence of the SN. GALEX data from 2008-06-05 shows a well-detected source at this location (NUV 19.93+/-0.04, FUV 21.18+/-0.09). It was not seen in AIS images from 2004-05-17 indicating a brightening in NUV by at least 2.5 mags. Coadded images from SDSS (all filters) reveal the presence of a possible faint host at the location. Assuming that the galaxy has r=23, at z=0.041 it translates to M_r=~-13, almost a 100 times dimmer than the LMC.

Palomar 60-inch (P60) data form 2009-03-21 reveals that it is still bright (r=17.60+/-0.04). It has stayed bright for over 500 days, and rising much of the time. In fact the SMARTS spectrum with its Balmer lines (strong H-alpha, H-beta, H-gamma), He I lines (5876, 7065 and possibly others), and an absence of Oxygen lines reveals it to be much more like SN1994Y at T=30 days (Filipenko A.V., ARAA, 1997, 35, 309-355, Fig. 14). There is also some evidence of Fe-I emission and the H-beta shows a P-Cygni like profile. The maximum P60 r-band magnitude was ~17.2 suggesting an absolute magnitude ~-18.8. The evidence is consistent with a type IIn supernova possibly with high density circumstellar material.

Additional observations are requested.

All current candidate and confirmed SNe as well as finding charts can be found here.