uGMRT observations of the recently discovered black hole X-ray binary candidate Swift J1727.8-3613

ATel #16295; Dusmanta Patra (SNBNCBS, Kolkata, India), Arghajit Jana (UDP, Santiago, Chile), Narendra Nath Patra (IIT, Indore, India), Birendra Chhotaray (PRL, Ahmedabad, India), Sachindra Naik (PRL, Ahmedabad, India)
on 17 Oct 2023; 12:08 UT
Credential Certification: Arghajit Jana (argha0004@gmail.com)

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Following the X-ray (ATel #16205, #16206, #16207, #16210), optical (ATel #16208, #16209) and radio (ATel #16211, #16289) detection of the new black hole X-ray binary candidate Swift J1727.8-1613, we carried out a follow-up low-frequency radio observation with the upgraded Giant Metrewave Radio Telescope (uGMRT). We observed the source on October 1, 2023, in band 4(550 to 900 MHz) with 400 MHz bandwidth encompassing 2048 channels. On-source time for our observation was ~128 minutes. The Astronomical Image Processing System (AIPS) was used for data analysis. After flagging and calibration, the final image was made by performing two rounds of phase-based self calibration, and one round of amplitude-based self calibration and shown in Figure (https://www.arghajit.net/swift-j1728). The contour levels of the image are set at (2, 4, 8, 16 ..) x 5 sigma, where sigma rms noise is 80 microJy/beam. We detected radio emission from the source at 681 MHz. The position of the source in the radio is consistent with the position of the previous detection. By fitting a point source model to the detected emission, we measured the flux density to be 32.3 +/- mJy at 681 MHz. The GMRT is a national facility operated by the National Centre for Radio Astrophysics of the Tata Institute of Fundamental Research. We thank the staff for helping with the observation.