DRAFT
2025-05-16 01:31:12
Type: Object/s-Data/Analysis
DAO photometric follow-up of selected transients 2025-B
Authors: D. D. Balam (Dominion Astrophysical Observatory, National Research Council of Canada)
Source Group: DAO_OTS
Keywords: Photometry
Abstract:
We present (SDSS) g&r filter photometric follow up observations of selected optical transients obtained using the 1.82-m Plaskett telescope of the (Dominion Astrophysical Observatory) National Research Council of Canada during the period of UT 2025 May 6 - 13.

Photometric observations obtained with the 1.82-m Plaskett telescope are differential (SDSS g&r filters) and measured from stars in either the Sloan Digital Sky Survey (Skyserver) or the Pan-STARRS release 1 (PS1) Survey - DR1. The photometric observations are contained in an attached table (see below).

The transient host galaxy light in our photometric measurement is minimized via one of two methods: Reference images are downloaded from the PanSTARRS image access (Flewelling, H. A., et al.) and are convolved, using the nightly PSF to match our images. The reference is then subtracted from our co-added images. A secondary photometric standard is defined and retained on the subtracted image using a pixel mask. 

A second method involves creating a model galaxy, using the IRAF artdata packages, scaling it to the images and subtracting the host galaxy. The differential photometry  was then performed using Image Reduction and Analysis Facility (IRAF) (Tody, D. 1986, "The IRAF Data Reduction and Analysis System").

Note:  photometric redshifts are marked 'p' and spectroscopic redshifts are marked 's'. All host redshifts are via the SDSS Skyserver.

Show current TNS values
Catalog Name Reported RA Reported DEC Reported Obj-Type Reported Redshift Host Name Host Redshift Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2025jau 14:42:54.732 +41:07:43.35 14:42:54.732 +41:07:43.35
TNS 2025jbe 13:09:18.842 +55:49:32.71 13:09:18.842 +55:49:32.71
TNS 2025jxn 16:44:41.833 +41:19:02.45 16:44:41.820 +41:19:02.44 SN Ia 0.078733
TNS 2025kfm 14:21:13.704 +29:59:27.83 SN Ia 0.030214 14:21:13.694 +29:59:27.96 SN Ia 0.030214
TNS 2025kfs 16:49:42.978 +49:00:53.41 SDSS J164942.38+490056.3 16:49:42.978 +49:00:53.41
TNS 2025khk 15:40:06.541 +35:44:44.70 15:40:06.541 +35:44:44.70 SN Ia 0.066759
TNS 2025khu 10:30:38.411 +46:57:58.76 10:30:38.411 +46:57:58.76 SN Ia 0.063
File Comments
OT_phot_250515_0.txt A table of SDSS g magnitudes and colours

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