SN 2018gv
RA/DEC ()
08:05:34.580 -11:26:16.87
121.394083 -11.438019
Type
SN Ia
Redshift
0.0053
Source Group
None
Discovery Date
2018-01-15 16:21:06
TNS AT
Y
Public
Y
Host Name
NGC 2525
Discovery Mag
16.5
Filter
Clear-
Discoverer/s
Koichi Itagaki

Spectra

 SN_2018gv - 2018-01-16 09:20:20 Keck1 / LRIS (None)z=
 SN_2018gv - 2018-01-16 03:27:50 ESO-NTT / EFOSC2-NTT (ePESSTO)z=
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Show Tellurics 
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   Binning factor: (rounded to nearest integer >1)
Mouse hovers at WL: 0 (rest),0 (observed)
Spectra
SelectIDObs-date (UT)Tel / InstExp-TimeObserver/sReducer/sGroupSpectrum ascii fileSpectrum fits fileSpec. TypeAssoc. GroupsEnd prop. periodRemarks
16482018-01-16 09:20:20Keck1 / LRIS1200M. R. Siebert, G. Dimitriadis, R. J. Foley (UCSC)G. DimitriadisNone tns_2018gv_2018-01-16_09-20-20_Keck1_LRIS.datObject
16532018-01-16 03:27:50ESO-NTT / EFOSC2-NTT300M. Berton, F. BufanoA. Floers, S. Taubenberger, C. VoglePESSTO tns_2018gv_2018-01-16_03-27-50_ESO-NTT_EFOSC2-NTT_ePESSTO_0.asci tns_2018gv_2018-01-16_03-27-50_ESO-NTT_EFOSC2-NTT_ePESSTO_0.fitsObjectePESSTO
Light Curves
FilterTel / InstObs-date rangePhotometry
Clear-Other_Other2018-01-15 16:21:06 - 2018-01-15 16:21:062
Photometry
IDObs-dateMag. / FluxErrLim. Mag./FluxUnitsFilterTel / InstExp-timeObserver/sRemarks
251682018-01-15 16:21:0616.5VegaMagClear-Other_Other
247502018-01-15 16:21:0616.518.5VegaMagClear-Other_Other0.5-m / f6.8
R-CousinsOther_Other2018-02-01 11:04:11 - 2018-02-01 11:04:111
Photometry
IDObs-dateMag. / FluxErrLim. Mag./FluxUnitsFilterTel / InstExp-timeObserver/sRemarks
251692018-02-01 11:04:1113.10.1VegaMagR-CousinsOther_Other150F. Watanabe0.4-m f/10 Meili telescope (Meade Schmidt-Cassegrain telescope) + CCD (SBIG STL-1001E) at Nayoro Observatory
G-GaiaGaia_Gaia-photometric2017-11-28 10:27:50 - 2018-03-28 10:22:042
Photometry
IDObs-dateMag. / FluxErrLim. Mag./FluxUnitsFilterTel / InstExp-timeObserver/sRemarks
275032018-03-28 10:22:0415.260.2ABMagG-GaiaGaia_Gaia-photometric60Robot
275022017-11-28 10:27:5021.5ABMagG-GaiaGaia_Gaia-photometricRobot[Last non detection]
AT Reportings
IDTime received (UT)SenderReporter/s (Discoverer/s)GroupRADECDiscovery date (UT)Discovery Mag.FilterRelated filesAT TypeInternal nameAssoc. GroupsEnd prop. periodRemarks
180762018-04-29 15:28:47Gaia_Bot1A. Delgado, D. Harrison, S. Hodgkin, M. van Leeuwen, G. Rixon, A. Yoldas (University of Cambridge), on behalf of Gaia Alerts teamGaiaAlerts08:05:34.580-11:26:16.872018-03-28 10:22:0415.26G-GaiaPSNGaia18batGaiaAlertsConfirmed SN Ia near galaxy NGC2525, aka SN2018gv
167292018-02-04 04:20:38Fumitake WatanabeFumitake WatanabeNone08:05:34.610-11:26:16.302018-01-15 16:21:0616.5Clear-PSN
Related files
FileFile TypeCommentsLast Modified (UT)Modified By
tns_2018gv_atrep_16729.jpgGraphics2018-03-18 08:01:56Fumitake Watanabe
164982018-01-15 21:35:26K.ItagakiKoichi ItagakiNone08:05:34.610-11:26:16.302018-01-15 16:21:0616.5Clear-PSN
Classification Reportings
IDTime received (UT)SenderClassifier/sGroupClassificationRedshiftRelated filesAssoc. GroupsEnd prop. periodRemarks
16482018-01-16 15:46:28ePESSTO_Bot1M. Berton, F. Bufano, A. Floers, S. Taubenberger, C. Vogl, O. Yaron, N. Knezevic on behalf of ePESSTOePESSTOSN Ia0.0053ePESSTO
16432018-01-16 12:41:15msiebertM. R. Siebert, G. Dimitriadis, R. J. Foley (UCSC)NoneSN Ia0.005274The spectrum indicates that SN 2018gv is a very young, normal Type Ia supernova. Using SNID (Blondin & Tonry, 2007, ApJ, 666, 1024), we find a good match to several Type Ia SNe 10-15 days before maximum brightness. We note that the small number of SNe Ia observed at very early phases often results in a bias to later phases. The SN was discovered at 16.5 mag, which assuming a distance modulus of 31.1 mag for the host galaxy NGC 2525 (Tully et al., 2013, AJ, 146, 86T), corresponds to an absolute magnitude of -14.8 -- or at least 4 mag below peak brightness. This further indicates that the SN is particularly young. If the SN has minimal host reddening, it will peak at V ~ 12 mag. We measure an Si II 6355 velocity of -16,800 km/s. Similarly, we measure a C II 6580 velocity of -15,300 km/s. We detect narrow Ca H&K absorption at the host-galaxy redshift, but do not detect narrow Na D.

Comments

Object coordinates updated according to AT-report 18076 of Group GaiaAlerts
Previous RA, DEC: 08:05:34.610, -11:26:16.30 (121.394208, -11.437861)
Updated RA, DEC: 08:05:34.580, -11:26:16.87 (121.394083, -11.438019)