RA/DEC (2000)
11:52:55.760 +36:59:10.36
178.232333 +36.986211
Type
SN Ia
Redshift
0.0031
Reporting Group
None
Discovering Data Source
None
Discovery Date
2018-02-03 15:09:07.000
TNS AT
Y
Public
Y
Host Name
NGC3941
Discovery Mag
15.1
Filter
Clear-
Reporter/s
Masaki Tsuboi

Spectra

 SN_2018pv - 2018-02-08 16:47:59 Kanata / HOWPol (None)z=
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   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),0 (observed)

Light curves

 Gaia_Gaia-photometric_G
 ATLAS-HKO_ATLAS-02_orange
 Other_Other_Clear
 Other_Other_Other
   
Pointer position (MJD, Mag, Abs.Mag): (0.00, 0.00, 0.00)
Spectra
ID Obs-date (UT) Tel / Inst Exp-Time Observer/s Reducer/s Group Spectrum ascii file Spectrum fits file Spec. Type Assoc. Groups End prop. period Remarks
1712 2018-02-08 16:47:59 Kanata / HOWPol 600 T. Nakaoka, M. Kawabata, R. Huang M. Yamanaka None tns_2018pv_2018-02-08.7_Kanata_HOWPol.txt Object The spectrum resembles with that of a normal Type Ia supernova (SN Ia) at the pre-maximum stage. Using the automatic SN classification tool, GELATO (Harutyunyan et al., 2008, A&A, 488, 383), the spectrum would be similar to that of SN 1992A at the 5 days before maximum. We identified the absorption lines of the CaII IR triplet, OI 7774, SiII 6355, SiII 5972, SII W-shape feature, and Fe II multiplet in our spectrum. The CaII IR triplet, OI 7774, and SiII 6355 line velocities were measured to be ~16500, ~16500, and ~13000 km/s, respectively. The SiII 5972 absorption line was significantly deeper than that of SN 1992A, suggesting that this SN might be a more subluminous event. We measured the equivalent width (EW) of the NaID line as to 0.9 angstrom, suggesting that the host galactic extinction could be very large (A_V~0.5-2.0). Even if the extinction is corrected for, this SN could be still in the rising phase. Follow-up observations could be encouraged.
Light Curves
Filter Tel / Inst Obs-date range JD Range Photometry
G-Gaia Gaia_Gaia-photometric 2018-01-11 22:27:50 - 2018-04-16 11:19:40 2458130.4359954 - 2458224.9719907 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
27078 2018-04-16 11:19:40 2458224.9719907 15.35 0.2 ABMag G-Gaia Gaia_Gaia-photometric 60 Robot
27077 2018-01-11 22:27:50 2458130.4359954 21.5 ABMag G-Gaia Gaia_Gaia-photometric Robot [Last non detection]
orange-ATLAS ATLAS-HKO_ATLAS-02 2018-01-02 13:49:26 - 2018-01-10 14:36:57 2458121.0759954 - 2458129.1089931 2
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
25613 2018-01-10 14:36:57 2458129.1089931 17.128 0.156 19.56 ABMag orange-ATLAS ATLAS-HKO_ATLAS-02 30 Robot
25612 2018-01-02 13:49:26 2458121.0759954 18.78 ABMag orange-ATLAS ATLAS-HKO_ATLAS-02 30 Robot [Last non detection]
Clear- Other_Other 2018-02-03 15:09:07 - 2018-02-03 15:09:07 2458153.131331 - 2458153.131331 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
25279 2018-02-03 15:09:07 2458153.131331 15.1 17.7 VegaMag Clear- Other_Other 20 M.Tsuboi Telescope:0.35-m f/4.6 reflector
Other- Other_Other 2018-01-25 16:06:55 - 2018-01-25 16:06:55 2458144.1714699 - 2458144.1714699 1
Photometry
ID Obs-date JD Mag. / Flux Err Lim. Mag./Flux Units Filter Tel / Inst Exp-time Observer/s Remarks
25278 2018-01-25 16:06:55 2458144.1714699 17.4 VegaMag Other- Other_Other 20 M.Tsuboi [Last non detection] Telescope:0.35-m f/4.6 reflector
AT Reports
ID Time received (UT) Sender Reporter/s Reporting group Disc. Data Source RA DEC Discovery date (UT) Discovery Mag. Filter Related files AT Type Host name Internal name Assoc. Groups End prop. period Remarks Bibcode Unreal Auto classification
17812 2018-04-17 23:26:07 Gaia_Bot1 A. Delgado,D. Harrison,S. Hodgkin et al. GaiaAlerts GaiaAlerts 11:52:55.760 +36:59:10.36 2018-04-16 11:19:40.000 15.35 G-Gaia PSN Gaia18ayx GaiaAlerts confirmed SN Ia in galaxy NGC3491, aka SN 2018pv N
17008 2018-02-19 00:00:02 ATLAS_Bot1 J. Tonry,B. Stalder,L. Denneau et al. ATLAS ATLAS 11:52:55.745 +36:59:10.19 2018-01-10 14:36:57.000 17.128 orange-ATLAS PSN ATLAS18mci ATLAS N
16800 2018-02-08 18:23:28 Masaki Tsuboi Masaki Tsuboi et al. 11:52:55.700 +36:59:11.60 2018-02-03 15:09:07.000 15.1 Clear- PSN NGC3941 Offsets:3″ Eand0″NofNGC3941 2018TNSTR.176....1T N
Related files
File Comments Last Modified (UT) Modified By
tns_2018pv_atrep_16800.jpg 2018-02-08 18:23:28 Masaki Tsuboi
tns_2018pv_atrep_16800_0.jpg 2018-02-07 15:37:38(UT) Telescope:0.35-m f/4.6 reflector 2018-02-08 18:23:28 Masaki Tsuboi
Classification Reports
ID Time received (UT) Sender Classifier/s Group Classification Redshift Spectra Related files Assoc. Groups End prop. period Remarks ADS Bibcode
1707 2018-02-08 18:48:56 Masayuki Yamanaka Masayuki Yamanaka None SN Ia 0.0031 1 SN Ia at the premaximum phase 2018TNSCR.181....1Y
Spectra
ID Obs-date (UT) Tel / Inst Exp-Time Observer/s Reducer/s Group Spectrum ascii file Spectrum fits file Spec. Type Assoc. Groups End prop. period Remarks
1712 2018-02-08 16:47:59 Kanata / HOWPol 600 T. Nakaoka, M. Kawabata, R. Huang M. Yamanaka None tns_2018pv_2018-02-08.7_Kanata_HOWPol.txt Object The spectrum resembles with that of a normal Type Ia supernova (SN Ia) at the pre-maximum stage. Using the automatic SN classification tool, GELATO (Harutyunyan et al., 2008, A&A, 488, 383), the spectrum would be similar to that of SN 1992A at the 5 days before maximum. We identified the absorption lines of the CaII IR triplet, OI 7774, SiII 6355, SiII 5972, SII W-shape feature, and Fe II multiplet in our spectrum. The CaII IR triplet, OI 7774, and SiII 6355 line velocities were measured to be ~16500, ~16500, and ~13000 km/s, respectively. The SiII 5972 absorption line was significantly deeper than that of SN 1992A, suggesting that this SN might be a more subluminous event. We measured the equivalent width (EW) of the NaID line as to 0.9 angstrom, suggesting that the host galactic extinction could be very large (A_V~0.5-2.0). Even if the extinction is corrected for, this SN could be still in the rising phase. Follow-up observations could be encouraged.

Comments

TNS
System

Object coordinates updated

Object coordinates updated according to AT-report 17812 of Group GaiaAlerts
Previous RA, DEC: 11:52:55.700, +36:59:11.60 (178.232083, +36.986556)
Updated RA, DEC: 11:52:55.760, +36:59:10.36 (178.232333, 36.986211)