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Calculating with a 30.7 distant modulus, a Type Ia supernova in NGC 7331 can brighten up to 11.4 magnitudes.
This morning (around 02:18UT) there was nothing wisible down to 14.3TG at the position of the PSN on my 20x30s co-added images taken with a 300mm (zoom) focus telephoto lens + Canons EOS 1000D DSLR camera.
An Ia type SN in NGC 7331 can possible reach 11.4 mag. So it is realy worth to follow this PSN.
PSN J01125492+0058457: a bright (mag 12.2) supernova in NGC 428?
http://www.cbat.eps.harvard.edu/unconf/followups/J01125492+0058457.html
http://www.bosssupernova.com/-%20New%20Folder/NGC428%20discovery.jpg
Would be in range of visual observers...
The distance modulus from NED is 30.8 and a type Ia gets to about -19, so at peak brightness, a SN Ia would be 12, which is about what we see. NGC 428 itself is a known nearby starforming galaxy. The object's classification is unknown, and will remain so until spectra are taken.
This is a good object to follow until we know its character, and then rethink. At only 12arcsec from the nucleus, it will be difficult as it fades, and there are many clumps/stars in the same area, making photometry even more difficult. Perhaps some of the southern observers can get spectra?
Arne
Confirmed by Alain Maury and Arto Oksanan (via Patrick Schmeer). Bright (V=12.1)! See previous message for position and discovery image.
Koichi Itagaki discovered another nova candidate:
PNV J19150199+0719471
Checking seqplot it seems APASS photometry for this field is available. Started creating new AAVSO sequence for this PNV. Stay tuned!
Clear skies,
Robert Fidrich (FRF)
Astrometry from AAVSOnet W30:
19:15:02.03 +07:19:46.7
Photometry from W30 on HJD 2456444.8707
V = 10.642
(B-V) = -0.081
(V-Rc) = -0.003
(Rc-Ic) = -0.035
I have seen novae with this color (basically A0), and the field does not look heavily reddened to me from inspection of a few field stars (I haven't looked at the APASS photometry). I'd wait until spectroscopic confirmation before deciding nova/WZ Sge classification. I added Rc/Ic magnitudes to the 96 sequence star, and checked that the APASS and W30 magnitudes track within a few hundredths in this region. The large errors for Rc/Ic on the APASS photometry can be ignored; the actual offset is perhaps 0.03mag (one bad night must be present in the catalog means).
I will leave this object on the W30 queue until its nature is fully established. If anyone wants to "adopt" this star, and submit new photometry to the AID, let me know.
Arne
http://www.aavso.org/low-resolution-spectrum-pnv-j191501990719471#comment-5906
Robin
A relatively nearby supernova, if confirmed in 4414
http://www.cbat.eps.harvard.edu/unconf/followups/J12262933+3113383.html
----Andy
A vsnet_alert has been put up on old nova V841 Oph, with an observer reporting brightening by nearly two magnitudes from its quiescent state. This nova was discovered in outburst in 1848 by J R Hind. Maximum brightness observed was 4.3.
http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-alert/15820
http://www.aavso.org/lcotw/v841-ophiuchi
http://www.aavso.org/vsx/index.php?view=detail.top&oid=21327
Confirmation is urgently sought. Cloudy here...
Rob Kaufman, KBJ
Using UCAC3 reference magnitudes, I measure V841 Oph at 13.6 V at 2013-06-10 05:27:50
Sky cleared late here and I got a similar result to mgw from the green channel of a DSLR image. There is a sequence for this obtainable in VSP. Here's the image, resized x2 with relevant AAVSO comp stars marked:
http://i727.photobucket.com/albums/ww271/Rob_Kau/V841Oph10June2013text…
Rob
Observations in the AAVSO International Database going back to 1970 show that the old nova V841 Oph varies between ~12.3 and 14.2 visual. Thus, the current magnitudes of ~13.5V do not indicate an outburst.
Elizabeth Waagen, AAVSO HQ
A possible nova in Aquila has been put up on CBAT's Transient Objects Confirmation page. Needs confirmation & a spectrum. Quite bright at discovery mag 10.0 unfiltered, and it was reported by prolific nova discoverer John Seach of NSW, Australia. Wall-to-wall clouds in my neck of the woods and a spell of bad weather ahead... http://www.cbat.eps.harvard.edu/unconf/followups/J19033200+0054100.html
Cheers -
Rob Kaufman (KBJ)
The PNV in Aquila report has just been withdrawn - m.p. 41 Daphne.
Rob
For those that monitor this thread by e-mail, there is a probable nova in Delphinus, currently 6.5 mag. There are two threads on the AAVSO discussion board about this:
http://www.aavso.org/bright-68u-possible-nova-del
http://www.aavso.org/nova-delphinus
The CBAT TOCP entry is here: http://t.co/sRSxZo7zCR
Hi everyone,
Swift has detected a GRB with a relatively bright optical counterpart, mag(U-band)=14.56, at the time of burst -- around 13:06 UT. Faulkes measured it at R=14.1 about five minutes post-burst (GCN 15140).
The transient is at RA 23:54:29.89 , Dec +29:25:46.2 (J2000). See GCN Circular 15139 for details.
Matt
Hi Matt
Thanks for the news. I managed to get some images with T17 from Siding Spring. First I used the Clear Filter to check if something could be seen. Then I took three images with the R filter. I hope I found the right object ....
I tried to use VPhot on the image, but no comparison stars could be found in the catalogues. How should I proceed to get some more informations?
Image can also be found on: http://astrob.in/54536/
Raymond
Hi Raymond,
For time-critical observations like these, check Seqplot:
http://www.aavso.org/seqplot/
for possible comparison stars. This includes most of the APASS calibrations, and there are several stars in your field of view that can be used. You can pick out one, say, and use it in VPHOT, and then give coordinates and magnitudes used for that star in your report.
Congratulations! It looks like you have a nice detection of the afterglow.
Arne
The UG star HS 0218+3229 is in outburst.
HS 0218+3229,2456540.82661,13.359,0.063,V,
Jim Roe [ROE]
Interesting flaring Blazar:
http://www.astronomerstelegram.org/?read=5423
An object has been posted to the CBAT TOCP page:
TCP J23382254-2049518
date: 2013 09 28.6383
Coordinates: 23 38 22.54 -20 49 51.8 (2000.0)
magnitude: 13.6 U
It has been confirmed by S. Kiyota (Kamagaya, Japan), by P. Camilleri (Warners Bay, NSW, Australia), and by T. Noguchi (Chiba-ken, Japan). Astrometry and image links by these
observers and by T. Yusa (Osaki, Japan) available on TOCP follow-up page at
www.cbat.eps.harvard.edu/unconf/followups/J23382254-2049518.html.
Photometry reported directly to the AAVSO includes:
2013 Sep. 29.5563 UT, 13.654 V ± 0.005 (haze/poor seeing, P. Nelson, Ellinbank Observatory, VIC, Australia)
29.58330, 13.513 B (J. Oey, P. Camilleri & H. Williams, Blue Mountains Observatory, Leura, NSW, Australia)
29.58750, 13.498 V (Oey et al.)
29.59176, 13.592 R (Oey et al.)
29.59610, 13.581 I (Oey et al.)
29.60039, 13.811 CV (Oey et al.)
Patrick Schmeer (Bischmisheim, Germany) reports that the variable appears to be identical to the following objects, and says that if this identification is correct, then the outburst amplitude is (at least) 8 magnitudes:
SBPO006897 in GSC2.3
R.A. 23h38m22.436s, Decl. -20o49'51.92" (J2000.0)
j= 21.96 mag
SDSS J233822.48-204952.2
R.A. 23h38m22.483s, Decl. -20o49'52.21" (J2000.0)
g= 21.586, r= 21.389, i= 21.720, u= 21.688 mag
GALEX J233822.5-204951 (ultraviolet source)
R.A. 23h38m22.503s, Decl. -20o49'51.71" (J2000.0)
NUV magnitude 22.7
Photometry and spectroscopy are requested to confirm the nature of this object (likely not a nova, very possibly a WZ Sge object).
Thank you and good observing!
Elizabeth Waagen, AAVSO HQ
For all the LBV fans....
It appears that SNHunt151 may be rebrightening again in UGC3165.
www.rochesterastronomy.com/snimages
http://www.cbat.eps.harvard.edu/unconf/followups/J04472985+2358555.html
This reminds me of 2009ip , but who knows, if it is the same type of activity, or not..
New Possible SN in ngc7331...
http://www.astronomerstelegram.org/?read=5721
www.rochesterastronomy.com/snimages
Itagaki-san discovered a possible SN in NGC 3448 at 15.6U magnitude:
PSN J10543413+5417569
Image: http://www.k-itagaki.jp/images/3448.jpg
A type Ia supernova can possible reach 12.6 mag in NGC 3448.
Clear skies,
Robert
Please check CBAT TOCP for details.
http://www.cbat.eps.harvard.edu/unconf/followups/J09554214+6940260.html
Seiichiro Kiyota
Japan
Hello All,
After several requests from forum users, we have decided to dedicate an entire forum to time sensitve alerts. This way users are not stuck wading through a very, very, very long thread trying to find information.
As soon as I post this comment, I will move this thread to the new forum and lock it. The original thread will remain in the new forum for archival purposes, but any new alerts should be posted (in their own threads) to the new forum.
Clear Skies,
Rebecca