- vsnet-alert - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-alert 27670] CRTSJ105550.1+095621 long bright outburst
by Taichi Kato 23 Apr '23

23 Apr '23

CRTSJ105550.1+095621 long bright outburst Probably SS Cyg, but might be worth visiting for time-resolved photometry (could be a borderline SS Cyg/SU UMa). YYYYMMDD(UT) mag observer 20230414.1158 17.824c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230414.1190 17.993c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230414.1253 18.302c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230414.1351 18.270c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230415.6262 <152c (Yutaka Maeda) 20230415.8710 17.045o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230415.8744 17.140o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230415.8795 17.066o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230415.8933 17.041o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230416.5474 144cG (Yutaka Maeda) 20230416.5474 144cG (Yutaka Maeda) 20230416.5588 143c (Tadashi Kojima) 20230417.1113 14.225c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230417.1145 14.184c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230417.1218 14.239c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230417.1338 14.252c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230418.8403 14.352o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230418.8408 14.399o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230418.8649 14.294o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230421.5835 141cG (Yutaka Maeda) 20230421.5835 141cG (Yutaka Maeda) 20230422.5617 141cG (Yutaka Maeda)

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[vsnet-alert 27669] V337 Cyg likely superoutburst
by Taichi Kato 23 Apr '23

23 Apr '23

V337 Cyg likely superoutburst YYYYMMDD(UT) mag observer 20230416.7564 <157c (Yutaka Maeda) 20230417.7723 <153c (Yutaka Maeda) 20230421.7955 144cG (Yutaka Maeda) 20230422.7684 150:c (Yutaka Maeda)

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[vsnet-alert 27668] ATLAS23dmk: most likely WZ Sge, still showing superhumps now?
by Taichi Kato 23 Apr '23

23 Apr '23

ATLAS23dmk: most likely WZ Sge, still showing superhumps now? The light curve resembles a WZ Sge star. The spectrum excludes a nova (also with a similar light curve). This object may still be in a late phase of the plateau and may be still showing superhumps (still less than 50 d after the peak). YYYYMMDD(UT) mag observer 20230312.2850 14.896o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230312.2894 14.886o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230312.2949 14.902o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230312.2967 14.934o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230312.3009 14.962o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230312.3072 14.959o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230312.3077 14.973o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230312.3178 14.997o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230313.4554 15.75C (Masayuki Moriyama) 20230314.5085 16.22C (Masayuki Moriyama) 20230314.5103 15.94B (Masayuki Moriyama) 20230314.5134 15.74Rc (Masayuki Moriyama) 20230314.5136 <15.04Ic (Masayuki Moriyama) 20230314.5146 15.97V (Masayuki Moriyama) 20230315.6207 16.48C (Masayuki Moriyama) 20230315.6256 15.72B (Masayuki Moriyama) 20230315.6301 16.19V (Masayuki Moriyama) 20230316.3178 16.310o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230316.3214 16.401o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230316.3313 16.487o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230316.3380 16.469o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230318.4729 16.60C (Masayuki Moriyama) 20230319.5440 167:C (Masayuki Moriyama) 20230326.4765 <169C (Masayuki Moriyama) 20230328.2353 17.616o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230328.2396 17.624o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230328.2448 17.504o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230328.2548 17.539o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230331.4957 173C (Masayuki Moriyama) 20230401.6107 <160C (Masayuki Moriyama) 20230410.2483 18.187o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230410.2516 18.149o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230410.2688 17.944o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230410.2943 18.071o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230412.2411 18.058c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230412.2472 18.273c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230412.2500 18.127c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230412.2602 18.325c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230414.2400 18.319c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230414.2439 18.245c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230414.2491 18.136c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230414.2594 18.283c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230416.2418 18.320c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230416.2485 18.244c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230416.2534 18.362c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230416.2637 18.332c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230422.2362 18.746c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230422.2394 18.312c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230422.2470 18.424c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230422.2638 18.500c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505))

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[vsnet-alert 27667] Gaia DR3 4630500071128655360 = Gaia23bpl: polar
by Taichi Kato 23 Apr '23

23 Apr '23

Gaia DR3 4630500071128655360 = Gaia23bpl: polar http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia23bpl/ Apparently high and low states in Gaia data. Porb=0.0642407(2) d from ATLAS data. Two maxima per period.

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[vsnet-alert 27666] V1227 Her superoutburst
by Taichi Kato 22 Apr '23

22 Apr '23

V1227 Her superoutburst YYYYMMDD(UT) mag observer 20230412.6680 <161c (Yutaka Maeda) 20230415.7356 <141c (Yutaka Maeda) 20230416.6551 148:c (Yutaka Maeda) 20230416.8081 153C (Masayuki Moriyama) 20230417.6709 <148c (Yutaka Maeda) 20230419.7756 154C (Masayuki Moriyama)

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[vsnet-alert 27663] Request for observations of the possible Nova in Sco - PNV J17224490-4137160 in support of NuSTAR
by Kirill Sokolovsky 22 Apr '23

22 Apr '23

Dear everyone, I have triggered a NuSTAR observation of the southern nova candidate PNV J17224490-4137160 aiming to characterize shock-powered hard X-ray emission often found in novae. NuSTAR will be pointed at PNV J17224490-4137160 continuously between 2023-04-21 21 UT (less than 5 hours from now!) and 2023-04-23 10 UT (Sunday morning). If you manage to collect time series photometry of PNV J17224490-4137160 during or close in time to the NuSTAR observing window - please kindly share your measurements with me. Observations in the V band are preferred, but other filters as well as unfiltered observations will be useful too. For context: the only previous simultaneous NuSTAR/optical time series observation of a nova (that I'm aware of) was that of V1674 Her in 2021, see Figure 2 in this paper https://ui.adsabs.harvard.edu/abs/2023MNRAS.521.5453S/abstract The observation revealed irregular variations in both optical and X-ray bands. The origin of these variations is unclear. The planned NuSTAR observation of PNV J17224490-4137160 provides an opportunity to collect more data and maybe find some clues. PNV J17224490-4137160 still awaits spectroscopic confirmation, but seems very likely to be a classical nova given its brightness and position close to the Galactic plane. At the declination of -41 it is best positioned for the observers in Southern hemisphere. CBAT "Transient Object Followup Reports" for PNV J17224490-4137160 http://www.cbat.eps.harvard.edu/unconf/followups/J17224490-4137160.html The VSX page of PNV J17224490-4137160 https://www.aavso.org/vsx/index.php?view=detail.top&oid=2387214 Best wishes, Kirill Sokolovsky

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[vsnet-alert 27662] Possible Nova in Sco - PNV J17224490-4137160
by walcom77 22 Apr '23

22 Apr '23

Hi All Following the posting on the Central Bureau's Transient Object Confirmation Page about a possible Nova in Sco (TOCP Designation: PNV J17224490-4137160) we performed some follow-up of this object through a TEL 0.1-m f/3.56 astrograph + CMOS located in Yass, North South Wales in Australia and operated by Telescope Live network (MPC code Q56). On images taken on April 21.5, 2023 we can confirm the presence of an optical counterpart with R-filtered CCD magnitude +7.8 (R-filtered images were saturated in 30-second exposures) at coordinates: R.A. = 17 22 45.01, Decl.= -41 37 15.6 (equinox 2000.0; Gaia DR2 catalogue reference stars for astrometry). Our confirmation image: https://tinyurl.com/novasco23 An animation showing a comparison between our image and an archive POSS plate: https://tinyurl.com/novascoanimation With kind regards, Ernesto Guido, Luca Izzo, Adriano Valvasori

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[vsnet-alert 27661] CRTS J121119.1-083957 likely superoutburst
by Taichi Kato 21 Apr '23

21 Apr '23

CRTS J121119.1-083957 likely superoutburst YYYYMMDD(UT) mag observer 20230411.1860 18.616o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230411.2191 18.587o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230411.2356 18.692o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230411.2607 18.447o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230411.2861 18.280zr (ZTF Alert DC mag (Masci+ 2019)) 20230412.2157 18.190o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230412.2189 18.122o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230412.2244 18.248o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230412.2481 17.637o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230414.1600 14.422c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230414.1641 14.426c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230414.1692 14.400c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230414.1812 14.392c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230415.9187 14.611o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230415.9220 14.606o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230415.9272 14.647o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230415.9372 14.785o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230417.1494 14.671c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230417.1549 14.590c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230417.1597 14.537c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230417.1696 14.444c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230418.9028 15.010o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230418.9058 14.949o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230418.9116 15.086o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230419.0802 149cG (Masao Funada) 20230420.1425 14.915c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230420.1494 14.980c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230420.1531 14.994c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505))

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[vsnet-alert 27660] PS16fbj: unusual superoutbursting object with dip
by Taichi Kato 21 Apr '23

21 Apr '23

PS16fbj: unusual superoutbursting object with dip In "rebightening" phase after dip. The supercycle of 1 yr is too short for a WZ Sge star. Object similar to MASTER OT J055845.55+391533.4 (see arXiv:2304.07695 = VSOLJ Variable Star Bulletin No. 113). YYYYMMDD(UT) mag observer 20230322.7705 15.345c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230322.7734 15.353c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230322.7891 15.328c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230324.0194 15.765o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230324.0222 15.766o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230324.0275 15.775o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230324.0377 15.776o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230326.7806 16.097o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230326.7841 16.067o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230326.7899 16.082o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230326.8011 16.014o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230328.0430 16.101o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230328.0462 16.156o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230328.0528 16.140o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230328.0668 16.267o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230330.7642 16.518o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230330.7670 16.589o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230330.7721 16.577o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230330.7850 16.511o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230401.7646 16.772o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230401.7681 16.787o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230401.7739 16.750o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230401.7837 16.809o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230402.9960 17.532o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230402.9992 17.775o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230403.0045 17.689o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230403.0149 17.689o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230406.0750 17.189o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230406.0780 17.112o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230406.0948 17.313o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230406.1071 17.076o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230407.7545 16.933o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230407.7575 16.943o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230407.7646 16.983o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230407.7747 17.013o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230409.0481 16.960o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230409.0509 17.060o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230409.0562 17.045o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230409.0660 17.000o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230410.7385 17.243o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230410.7417 17.285o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230410.7475 17.319o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230410.7582 17.139o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230412.0182 17.094c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230412.0220 17.132c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230412.0286 17.174c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230412.0396 17.126c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505))

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[vsnet-alert 27659] CRTS J121119.1-083957 bright outburst
by Taichi Kato 21 Apr '23

21 Apr '23

CRTS J121119.1-083957 bright outburst (SU UMa candidate) YYYYMMDD(UT) mag observer 20230328.2916 18.639zg (ZTF Alert DC mag (Masci+ 2019)) 20230328.3140 18.081zr (ZTF Alert DC mag (Masci+ 2019)) 20230409.3363 17.964zr (ZTF Alert DC mag (Masci+ 2019)) 20230411.2861 18.280zr (ZTF Alert DC mag (Masci+ 2019)) 20230419.0802 149cG (Masao Funada)

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2021

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