2020MNRAS.494.5110B

Query : 2020MNRAS.494.5110B

2020MNRAS.494.5110B - Mon. Not. R. Astron. Soc., 494, 5110-5117 (2020/June-1)

LOFAR 144-MHz follow-up observations of GW170817.

BRODERICK J.W., SHIMWELL T.W., GOURDJI K., ROWLINSON A., NISSANKE S., HOTOKEZAKA K., JONKER P.G., TASSE C., HARDCASTLE M.J., OONK J.B.R., FENDER R.P., WIJERS R.A.M.J., SHULEVSKI A., STEWART A.J., TER VEEN S., MOSS V.A., VAN DER WIEL M.H.D., NICHOLS D.A., PIETTE A., BELL M.E., CARBONE D., CORBEL S., EISLOFFEL J., GRIESSMEIER J.-M., KEANE E.F., LAW C.J., MUNOZ-DARIAS T., PIETKA M., SERYLAK M., VAN DER HORST A.J., VAN LEEUWEN J., WIJNANDS R., ZARKA P., ANDERSON J.M., BENTUM M.J., BLAAUW R., BROUW W.N., BRUGGEN M., CIARDI B., DE VOS M., DUSCHA S., FALLOWS R.A., FRANZEN T.M.O., GARRETT M.A., GUNST A.W., HOEFT M., HORANDEL J.R., IACOBELLI M., JUTTE E., KOOPMANS L.V.E., KRANKOWSKI A., MAAT P., MANN G., MULDER H., NELLES A., PAAS H., PANDEY-POMMIER M., PEKAL R., REICH W., ROTTGERING H.J.A., SCHWARZ D.J., SMIRNOV O., SOIDA M., TORIBIO M.C., VAN HAARLEM M.P., VAN WEEREN R.J., VOCKS C., WUCKNITZ O. and ZUCCA P.

Abstract (from CDS):

We present low-radio-frequency follow-up observations of AT 2017gfo, the electromagnetic counterpart of GW170817, which was the first binary neutron star merger to be detected by Advanced LIGO-Virgo. These data, with a central frequency of 144 MHz, were obtained with LOFAR, the Low-Frequency Array. The maximum elevation of the target is just 13.○7 when observed with LOFAR, making our observations particularly challenging to calibrate and significantly limiting the achievable sensitivity. On time-scales of 130-138 and 371-374 d after the merger event, we obtain 3σ upper limits for the afterglow component of 6.6 and 19.5 mJy beam–1, respectively. Using our best upper limit and previously published, contemporaneous higher frequency radio data, we place a limit on any potential steepening of the radio spectrum between 610 and 144 MHz: the two-point spectral index α610144 ≳-2.5. We also show that LOFAR can detect the afterglows of future binary neutron star merger events occurring at more favourable elevations.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): gravitational waves - stars: neutron - radio continuum: stars

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 4993 Sy2 13 09 47.6908761600 -23 23 02.314044636   13.34   11.92   ~ 397 0
2 GrW 170817 GWE 13 09 48.0850 -23 22 53.343           ~ 2683 0
3 3C 295 Sy1 14 11 20.6 +52 12 09   22.34 20.80 18.54   ~ 1021 4

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