DRAFT
2025-04-23 00:17:43
Type: Object/s-Data/Analysis
DAO photometric follow-up of selected transients 2025-A
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 first quarter of 2025.

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 2025dju 13:28:03.565 +34:19:46.72 SN Ia 0.034081 13:28:03.565 +34:19:46.72 SN Ia 0.034081
TNS 2025euy 15:24:02.480 +38:15:12.78 15:24:02.480 +38:15:12.78
TNS 2025euz 14:24:20.565 +28:58:29.08 SN Ia 0.03918337 14:24:20.565 +28:58:29.08 SN Ia 0.039183
TNS 2025fan 09:40:37.680 +28:58:11.96 09:40:37.680 +28:58:11.96
TNS 2025fas 08:03:20.986 +66:02:55.91 SN Ia 0.0391 08:03:20.986 +66:02:55.91 SN Ia 0.0391
TNS 2025fcm 12:52:51.084 +46:45:32.93 SN Ia 0.06 12:52:51.084 +46:45:32.93 SN Ia 0.06
TNS 2025gyz 08:29:27.775 +32:37:13.39 SN Ia 0.09 08:29:27.773 +32:37:13.22 SN Ia 0.09
TNS 2025gzz 17:12:03.626 +20:24:02.67 17:12:03.617 +20:24:02.68
TNS 2025hhb 12:49:44.794 +43:28:58.52 12:49:44.794 +43:28:58.52
TNS 2025hku 16:00:41.909 +17:21:00.02 16:00:41.922 +17:21:00.10
TNS 2025hli 13:19:27.558 +15:36:21.40 13:19:27.558 +15:36:21.40
TNS 2025hmo 15:16:10.895 +52:28:04.02 SN Ia 0.092 15:16:10.885 +52:28:03.85 SN Ia 0.092
TNS 2025hkd 12:58:03.012 +09:43:24.22 SN Ia 0.031 12:58:03.001 +09:43:24.05 SN Ia 0.031
TNS 2025hmp 11:10:23.580 +10:24:05.49 11:10:23.567 +10:24:05.14
TNS 2025hmx 12:27:38.433 +43:05:19.49 12:27:38.433 +43:05:19.49
TNS 2025hmy 18:24:07.189 +37:06:44.92 18:24:07.152 +37:06:44.25
TNS 2025hvq 11:31:26.511 +15:43:39.64 11:31:26.546 +15:43:39.69
TNS 2025hxz 13:35:01.600 +28:35:53.59 13:35:01.600 +28:35:53.59
TNS 2025hyf 16:10:58.797 +27:03:46.96 SDSS J161058.52+270347.6 16:10:58.797 +27:03:46.96
TNS 2025hym 14:35:25.765 +26:40:15.34 SDSS J143525.70+264005.7 0.1099445 14:35:25.751 +26:40:15.36
TNS 2025bbm 02:27:51.037 +49:28:33.27 02:27:51.037 +49:28:33.27
TNS 2025hdm 16:00:49.295 +28:17:10.98 SDSS J160049.47+281708.4 0.1164354 16:00:49.295 +28:17:10.98
TNS 2025hgx 16:29:52.092 +27:57:19.94 16:29:52.092 +27:57:19.94
File Comments
OT_2025A_table_0.png The table of photometry
OT_2025A_phots_0.txt

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