DRAFT
2026-07-16 04:44:10
Type: Object/s-Data/Analysis
Bibcode: 2026TNSAN.218....1K
DAO Photometric follow up of selected transients
Authors: M R. Kendurkar (GSNST)
Source Group: GSNST
Keywords: Surveys, Photometry, Transient, Nova, Optical
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 2025 April 23 to 28 UT.

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 - OT_mag_260613.txt).

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 2025hcw 11:10:37.269 +35:25:31.31 SN Ia 0.075083 11:10:37.269 +35:25:31.31 SN Ia 0.075083
TNS 2025heg 18:20:46.154 +19:37:30.82 SN Ia 0.0298 18:20:46.154 +19:37:30.82 SN Ia 0.0298
TNS 2025hes 17:01:47.829 +24:42:26.29 SN Ia 0.049751 17:01:47.829 +24:42:26.29 SN Ia 0.049751
TNS 2025hkd 12:58:03.001 +09:43:24.05 SN Ia 0.031 12:58:03.001 +09:43:24.05 SN Ia 0.031
TNS 2025hmf 19:43:37.401 +48:23:54.78 19:43:37.401 +48:23:54.78
TNS 2025hnv 14:37:59.937 +14:27:17.51 SN Ia 0.052 14:37:59.937 +14:27:17.51 SN Ia 0.052
TNS 2025hoq 16:01:43.972 +31:28:27.67 16:01:43.972 +31:28:27.67
TNS 2025hvq 11:31:26.531 +15:43:39.55 11:31:26.531 +15:43:39.55
TNS 2025hxf 15:53:05.008 +20:38:08.53 SN II 0.0262 15:53:05.008 +20:38:08.53 SN II 0.0262
TNS 2025hym 14:35:25.751 +26:40:15.36 SDSS J143525.70+264005.7 0.1099445 14:35:25.751 +26:40:15.36
TNS 2025hzp 13:50:32.107 +23:21:13.15 13:50:32.107 +23:21:13.15
TNS 2025iau 13:50:44.931 +49:20:29.60 SN Ia 0.044 13:50:44.931 +49:20:29.60 SN Ia 0.044
TNS 2025icd 16:03:01.079 +44:34:45.43 SDSS J160301.25+443447.1 16:03:01.079 +44:34:45.43
TNS 2025ico 15:40:30.911 +34:09:14.73 15:40:30.911 +34:09:14.73
TNS 2025idt 12:49:22.019 +26:37:50.74 12:49:22.019 +26:37:50.74
TNS 2025ihj 19:28:47.373 +41:54:30.21 19:28:47.373 +41:54:30.21
TNS 2025iic 18:30:06.369 +28:19:28.70 SN Ia 0.09 18:30:06.369 +28:19:28.70 SN Ia 0.09
TNS 2025iif 16:00:20.675 +28:20:00.16 SDSS J160020.68+281958.4 16:00:20.675 +28:20:00.16
TNS 2025iil 15:19:13.649 +06:07:48.25 SDSS J151913.12+060750.2 0.04499168 15:19:13.649 +06:07:48.25
TNS 2025iit 12:59:35.338 +15:02:54.48 12:59:35.338 +15:02:54.48
TNS 2025iiv 11:27:19.332 +22:02:59.55 11:27:19.332 +22:02:59.55
TNS 2025ijv 17:17:37.944 +25:54:58.16 SDSSCGB 5218.1 0.17039 17:17:37.944 +25:54:58.16
TNS 2025ikg 15:13:01.518 +34:39:56.88 SN Ia 0.07177 SDSS J151301.51+343958.8 0.07177 15:13:01.518 +34:39:56.88 SN Ia 0.07177
TNS 2025imk 14:14:27.374 +13:36:36.80 SN Ia 0.07857 14:14:27.374 +13:36:36.80 SN Ia 0.07857
TNS 2025imm 11:06:24.930 +45:30:45.28 SN Ia-91bg-like 0.064 11:06:24.930 +45:30:45.28 SN Ia-91bg-like 0.064
File Comments
OT_mag_2504_0.txt

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