Parkes upper limits on the pulsed radio emission of SGR 1935+2154

ATel #6371; Marta Burgay (INAF-OAC), Gian Luca Israel (INAF-OAR), Nanda Rea (CSIC-IEEC; U. Amsterdam), Andrea Possenti (INAF-OAC), Francesco Coti Zelati (U. Insubria; INAF-OAB; U. Amsterdam), Paolo Esposito (INAF-IASF), Sandro Mereghetti (INAF-IASF), Andrea Tiengo (IUSS Pavia), on behalf of a larger collaboration
on 5 Aug 2014; 17:07 UT
Credential Certification: GianLuca Israel (gianluca@mporzio.astro.it)

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Following the Chandra detection of the 3.2s spin period of SGR 1935+2154 (Israel et al., Atel #6370), we have triggered our Parkes NAPA program (ID P626; PI: Burgay) in search for the possible activation of radio pulsed emission from this newly discovered magnetar.

Parkes observed the source four times between the 1st and 3rd of August 2014, at 10cm (about 1.5hr everyday; bandwidth of 1024 MHz with the DFB3 and DFB4 backends) and 20cm (once for about 1.5hr; bandwidth of 350/256 MHz with the BPSR and DFB4 backends, respectively). Data were both folded at the period discovered in the X-ray band (Atel #6370), and blindly searched over a dispersion measure range from DM 0 to 1000 pc/cm3, with a DM step allowing a maximum pulse smearing of 0.15% of the spin period. We do not see significant radio pulsed emission from SGR 1935+2154 at 10cm or 20cm, with a limiting flux of about 0.07 mJy and 0.1 mJy, respectively (assuming a 10% duty cycle and a reference signal-to-noise ratio of 8). The 20cm data taken with BPSR were also searched for single dedispersed pulses in real time using HEIMDALL (http://sourceforge.net/projects/heimdall-astro/), with no evidence for the occurrence of dispersed pulses of significant amplitude.

The Parkes radio telescope is part of the Australia Telescope which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. The authors warmly thank Phil Edwards for the prompt scheduling of the observations and John Reynolds for releasing part of the telescope time of his project.