Detection of low-frequency radio emission from the magnetar XTE J1810-197

ATel #12288; M. E. Lower (Swinburne University of Technology "SUT"), M. Bailes (SUT), A. Jameson (SUT), W. Farah, C. Flynn (SUT), V. Gupta (SUT), T. Bateman (The University of Sydney "USyd"), E. D. Barr (Max-Planck-Institut fuer Radioastronomie "MPIfR"), S. Bhandari (CSIRO/ATNF), M. Caleb (University of Manchester "UMan"), D. Campbell-Wilson (USyd), C. Day (SUT), A. Deller (SUT), A. J. Green (USyd), R. W. Hunstead (USyd), F. Jankowski (UMan), E. F. Keane (Square Kilometer Array Organisation), S. Oslowski (SUT), A. Parthasarathy (SUT), K. Plant (Caltech), D. C. Price (SUT), V. Ravi (Harvard-Smithsonian Center for Astrophysics), R. M. Shannon (SUT), A. Sutherland (USyd), D. Temby (USyd), G. Torr (USyd), G. Urquhart (USyd), V. Venkatraman Krishnan (MPIfR), T. Venville (SUT)
on 12 Dec 2018; 20:44 UT
Credential Certification: Marcus Lower (mlower@swin.edu.au)

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Following the reported radio revival of the magnetar XTE J1810-197 (ATel #12284) and subsequent detection at high-frequencies (ATel #12285), we conducted low-frequency observations of the pulsar with the 1.6km Molonglo Observatory Synthesis Telescope as part of the UTMOST project (Bailes et al. 2017).

A single 20 minute observation was performed at 835 MHz with 31 MHz of bandwidth at 02:38:32 UTC on December 12, 2018 (MJD 58464.11). The pulsar was tracked using a tied array beam as it transited through the Molonglo primary beam, resulting in a final integrated signal-to-noise ratio of 46.1. Throughout the observation we detected a number of bright single pulses, many with individual signal-to-noise ratios in excess of 7.

Using the pulsars PSR J1903+0135 and PSR J1644-4559 as references, we estimate the flux density at 835 MHz of XTE J1810-197 to be 9 +/- 4 mJy.

We will continue to regularly monitor this magnetar with UTMOST on a daily to weekly cadence.

References:
Bailes, M., et al., The UTMOST: A Hybrid Digital Signal Processor Transforms the Molonglo Observatory Synthesis Telescope PASA, 34, 045 (2017).

A plot showing the single pulses in addition to the integrated profile can be found here: profile at 835 MHz.

Magnetar in radio outburst