1 April 2021 at 11:50 pm #574933
SN 2021hiz is a type Ia supernova discovered 2021-03-30 and rising rapidly, likely heading for ~mag 13.
Here it is tonight on the spectrograph guider at ~mag 15
Attachments:2 April 2021 at 11:26 am #584030
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 ?
Robin2 April 2021 at 11:59 am #584031
Looking at the details for the object in the GSC, I see it is classed as 3 – “non stellar”
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?2 April 2021 at 12:12 pm #584032Maxim UsatovParticipant
Looks like a bright SFR in the galaxy identified as a non-stellar source.2 April 2021 at 12:22 pm #584033
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 I812 April 2021 at 12:24 pm #5840342 April 2021 at 1:21 pm #584035
This amplifield view shows the Sn more clearly.
Denis2 April 2021 at 1:23 pm #584036
This amplified image shows the SN more clearly.
Denis2 April 2021 at 2:39 pm #584037Ron ArbourParticipant
AT 2021hiz classified as a young Type Ia supernova.2 April 2021 at 3:09 pm #584038
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
Robin2 April 2021 at 3:27 pm #584039
A comparison of the spectrum from last night with the SOAR Goodman classification spectrum from TNS and described in Atel 14500 taken 2 nights earlier5 April 2021 at 12:12 pm #584055
ZTF report mag 14.5 (ZTF g) this morning and still rising6 April 2021 at 3:47 pm #584060
It was bright enough for a slitless spectrum using the Star Analyser last night
Robin6 April 2021 at 11:50 pm #584061
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