DRAFT
2023-07-27 17:17:46
Type: Object/s-Data/Analysis
Bibcode: 2023TNSAN.211....1K
Multi-Band Photometric Follow-Up of selected Transients
Authors: M. R. Kendurkar (GSNST) and D. D. Balam (Dominion Astrophysical Observatory, National Research Council of Canada)
Source Group: GSNST
Keywords: Time-domain, Methods, Photometry, Transient, Cataclysmic Variable, Supernova, Optical
Abstract:
Here we present multi-band photometric follow up observations of 5 optical transients using 1.82-m Plaskett Telescope (E2V, 4K x 2K CCD) at Dominion Astrophysical Observatory of the National Research Council of Canada.

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").

 

   Name                UT     u        g       r    u-g     g-r    host_g     z
 2023nob   2023-07-22.467  -------  18.95  --------  --------  --------   20.35  0.140 
 2023npl   2023-07-23.329  -------  15.23  15.52  --------  -0.29   15.23  0.0
 2023ixf   2023-07-25.246  14.32  12.88  12.08  +1.44  +0.80   12.21  0.0008
 2023nur   2023-07-25.365  19.67  19.79  19.70  -0.12  +0.09   19.63  0.122
 2023nwg   2023-07-26.403  ------- 19.13  19.50  -------  -0.37   18.88  0.136

 

Several different secondary standards were used from SDSS DR16 (Ahumada+, 2020), LAMOST DR7 catalogs (Luo+, 2019), and PS1 Survey DR1 (Chambers+, 2016) to perform differential photometry using Image Reduction and Analysis Facility. 

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 2023nob 22:13:58.422 +18:53:48.31 22:13:58.420 +18:53:48.04
TNS 2023npl 18:42:58.400 +09:58:55.50 CV 18:42:58.400 +09:58:55.50 CV
TNS 2023ixf 14:03:38.562 +54:18:41.94 SN II 0.0008 M101 14:03:38.562 +54:18:41.94 SN II 0.0008
TNS 2023nur 22:24:03.820 +14:27:03.03 SDSS J222403.74+142702.4 22:24:03.801 +14:27:03.16
TNS 2023nwg 21:25:47.583 +00:53:07.64 21:25:47.583 +00:53:07.64

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