April 2023 - vsnet-alert - ooruri.kusastro.kyoto-u.ac.jp

[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)

1 0

[vsnet-alert 27663] Request for observations of the possible Nova in Sco - PNV J17224490-4137160 in support of NuSTAR
by Kirill Sokolovsky 21 Apr '23

21 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

2 1

[vsnet-alert 27662] Possible Nova in Sco - PNV J17224490-4137160
by walcom77 21 Apr '23

21 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

1 1

[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))

1 0

[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))

1 0

[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)

1 0

[vsnet-alert 27658] SDSS J093249.57+472523.0 faint but superoutburst
by Taichi Kato 20 Apr '23

20 Apr '23

SDSS J093249.57+472523.0 faint but superoutburst (UGSU+E) YYYYMMDD(UT) mag observer 20230408.567 <175C (Mitsutaka Hiraga) 20230409.1977 16.938zr (ZTF Alert DC mag (Masci+ 2019)) 20230409.3051 17.166zg (ZTF Alert DC mag (Masci+ 2019)) 20230409.3061 17.129zg (ZTF Alert DC mag (Masci+ 2019)) 20230409.5627 <166c (Yutaka Maeda) 20230410.3675 16.604o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230410.3725 16.769o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230410.3753 16.819o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230410.3931 17.165o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230411.1866 16.948zg (ZTF Alert DC mag (Masci+ 2019)) 20230411.1876 17.002zg (ZTF Alert DC mag (Masci+ 2019)) 20230411.2489 17.405zr (ZTF Alert DC mag (Masci+ 2019)) 20230411.2493 17.353zr (ZTF Alert DC mag (Masci+ 2019)) 20230412.3249 17.558c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230412.3298 17.562c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230412.3352 17.561c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230412.3455 17.910c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230414.3431 17.714c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230414.3486 17.680c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230414.3715 17.524c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230414.3720 17.658c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230414.3782 17.786c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230416.3300 17.735c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230416.3329 17.547c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230416.3385 17.633c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230416.3423 17.372c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230416.3455 17.533c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230416.3511 18.314c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230416.3520 18.776c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230416.3627 17.679c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230417.5467 <164c (Yutaka Maeda) 20230418.3152 17.846c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230418.3180 17.722c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230418.3361 17.734c (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505))

1 0

[vsnet-alert 27657] V485 Cen superoutburst (EI Psc)
by Taichi Kato 20 Apr '23

20 Apr '23

V485 Cen superoutburst (EI Psc) YYYYMMDD(UT) mag observer 20230409.1832 <178C (Masao Funada) 20230412.6275 <164C (Masayuki Moriyama) 20230416.442 156 (Rod Stubbings) 20230416.6384 156C (Masayuki Moriyama) 20230417.2305 15.03cG (Masao Funada) 20230417.717 149 (Rod Stubbings) 20230418.1854 15.42cG (Masao Funada) 20230418.405 150 (Rod Stubbings) 20230419.410 143 (Rod Stubbings)

1 0

[vsnet-alert 27656] ATLAS18olb likely superoutburst
by Taichi Kato 20 Apr '23

20 Apr '23

ATLAS18olb likely superoutburst SU UMa star. Last outburst (super) in 2018 May-June. YYYYMMDD(UT) mag observer 20230419.6588 133c (Tadashi Kojima)

1 0

[vsnet-alert 27655] ASASSN-14dw recent data
by Taichi Kato 19 Apr '23

19 Apr '23

ASASSN-14dw recent data Not as bright as 2022 Aug. superoutburst. The supercycle suggests that a superoutburst may be due. YYYYMMDD(UT) mag observer 20230417.742 163 (Rod Stubbings) 20230417.9432 14.655o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230417.9544 14.606o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230417.9816 14.459o (ATLAS Forced Photometry (Tonry+2018, PASP 130, 064505)) 20230418.413 143 (Rod Stubbings)

1 0