DRAFT
2025-07-24 18:31:19
Type: Object/s-Data/Analysis
Bibcode: 2025TNSAN.229....1B
DAO photometric follow-up of selected transients 2025-C
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 21 - July 23.

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 2025kpp 12:04:57.795 +26:05:32.00 12:04:57.795 +26:05:32.00
TNS 2025kpr 13:40:12.436 +34:44:12.95 13:40:12.436 +34:44:12.95
TNS 2025qmi 17:24:03.774 +51:33:43.60 SN Ia 0.061 17:24:03.782 +51:33:43.49 SN Ia 0.061
TNS 2025qna 14:45:01.650 +41:17:41.29 14:45:01.650 +41:17:41.29
TNS 2025qpm 18:37:43.302 +60:48:01.58 SN II 0.0295 18:37:43.302 +60:48:01.58 SN II 0.0295
TNS 2025qpv 21:30:58.771 +22:32:29.50 SN Ia 0.0456 2MASX J21305895+2232313 21:30:58.771 +22:32:29.50 SN Ia 0.0456
TNS 2025qqg 16:24:43.374 +28:38:27.44 16:24:43.374 +28:38:27.44
TNS 2025qqz 18:11:06.402 +15:17:18.55 18:11:06.402 +15:17:18.55 SN II 0.031
TNS 2025rcd 21:02:17.271 +22:04:55.84 21:02:17.271 +22:04:55.84
TNS 2025rff 17:37:56.240 +48:43:30.87 17:37:56.240 +48:43:30.87
TNS 2025rhx 16:18:19.029 +41:07:55.62 16:18:19.049 +41:07:55.72
TNS 2025rwr 17:48:24.637 +28:17:27.57 WISEA J174824.66+281729.0 17:48:24.637 +28:17:27.57
File Comments
OT_phots_2025C_0.txt

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