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SN 2021hiz in UGC 7513 (Virgo)

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Robin Leadbeater's picture
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SN 2021hiz in UGC 7513 (Virgo)

SN 2021hiz is a type Ia supernova discovered 2021-03-30 and rising rapidly, likely heading for ~mag 13.

https://alerce.online/object/ZTF21aaqytjr

Here it is tonight on the spectrograph guider at ~mag 15

Cheers

Robin

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what happened to GSC 00288 00235 ??

Rainer Ehlert has pointed out on the RSpec forum that there is a Mag 12 star GSC 00288 00235 listed at the same position (with an arcsec) but this does not appear in images from DSS,SDSS PanSTARRS and there is certainly nothing that bright there now. (SN2021hiz is definitely a type Ia SN at a  redshift matching UGC 7513)

Could there be an error in the GSC catalogue and  the exact coordinate match a coincidence or is there more to this ? Any ideas ?

Cheers

Robin

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GSC 00288 00235 not a star ?

Looking at the details for the object in the GSC, I see it is classed as 3 - "non stellar"
http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ6066f68a1b2892&-out.add=.&-source=I/254/out&GSC=0028800235
so perhaps GSC 00288 00235 was detected in GSC as an area  including the bright knots in the galaxy directly above it with an integrated brightness of mag 12?

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Looks like a bright SFR in

Looks like a bright SFR in the galaxy identified as a non-stellar source.

Denis Buczynski's picture
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SN 2021hiz in UGC 7513 (Virgo)

Here is my image of this object from last night 20210402 00:29 UT with astrometry of what I assume to be the SN.There are lots of knots in the galaxy arm and i have to use a small 3 pixel radius aperture to get a measurement.

Denis Buczynski I81

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SN 2021hiz in UGC 7513 (Virgo)

Denis Buczynski's picture
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SN 2021hiz in UGC 7513 (Virgo)

This amplifield view shows the Sn more clearly.

Denis

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SN 2021hiz in UGC 7513 (Virgo)

This amplified image shows the SN more clearly.

Denis

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SN 2021hiz

AT 2021hiz classified as a young Type Ia supernova.

https://www.astronomerstelegram.org/?read=14500

Robin Leadbeater's picture
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Spectrum

The spectrum from last night with some contamination from galaxy lines 

SNID confirms a good fit to a young type Ia several days from maximum

Cheers

Robin

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Comparison with SOAR, Goodman spectrum

A comparison of the spectrum from last night with the SOAR Goodman classification spectrum from TNS and described in Atel 14500 taken  2 nights earlier  

Robin Leadbeater's picture
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mag 14.5

ZTF report mag 14.5 (ZTF g) this morning and still rising

https://alerce.online/object/ZTF21aaqytjr

Robin Leadbeater's picture
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Bright enough for the Star Analyser

It was bright enough for a slitless spectrum using the Star Analyser last night

https://britastro.org/observations/observation.php?id=20210406_144443_9e...

Cheers

Robin

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Yes, I get 13.8 unfiltered

Yes, I get 13.8 unfiltered ref Gaia DR2 G tonight. Image here.