Followup of SN2023ixf with HCT on 28th May, 2023.

ATel #16067; F. Sutaria (IIA), Akshara Mathure (St Xaviers College, Mumbai, NIUS HBCSE-TIFR), and Alak Ray
on 31 May 2023; 14:59 UT
Credential Certification: Firoza Sutaria (fsutaria@iiap.res.in)

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We report the spectroscopic observations of SN 2023ixf carried out by Hanle Faint Object Spectrograph and Camera (HFOSC) mounted on the Himalayan Chandra Telescope (HCT) on 28th May 2023 (MJD 60092.71773727) under the program HCT-2023-C2-P7/P8. The 3900-9200 A spectrum used the grism elements HFOSC/Gr7 (r=1330) and HFOSC/Gr8 (r=2190). No calibration source was available on the same night. The spectra were calibrated by an earlier night’s calibration with respect to Feige-66. The spectrum is still dominated by the continuum, similar to that observed on 22nd May, 2023 (ATEL #16053). In the Gr7 (3800-7500 A) spectrum, we see a broadened emission line at 4861 A, corresponding to H-beta. An additional emission feature is present at 4873 A. In the Gr8 spectrum, we see an H-alpha P-Cygni profile with emission peaking at 6568 A and an absorption dip at 6546 A. Out of the two spectra obtained on 28th May 2023, GELATO runs show Gr7 spectrum is best matched to the template of SN 2008es type II L pec (12.5 days), with a poor Quality of Fit (QoF) factor of 1.03 while the Gr8 is best matched to the template of SN 1998S type IIn (17.5 days) with a better QoF of 2.53. We would however report that the spectrum observed on 22nd May 2023 (#ATEL 16053) was best matched by GELATO to SN 2008es type II L pec (19.5 days) with QoF=1.47. Using an earlier spectrum of SN 2023ixf on 20th May 2023 at HCT reported on the TNS server (ID 15044), and GELATO, we find a match to SN 1998S type IIn (3.5 days) with a QoF of 1.68.