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.

doi:10.1093/mnras/staa950

LOFAR 144-MHz follow-up observations of GW170817

J.W. Broderick
(
- ASTRON, Dwingeloo
)
,
T.W. Shimwell
(
- ASTRON, Dwingeloo
)
,
K. Gourdji
(
- Amsterdam U., Astron. Inst.
)
,
A. Rowlinson
(
- ASTRON, Dwingeloo and
- Amsterdam U., Astron. Inst.
)
,
S. Nissanke
(
- U. Amsterdam, GRAPPA and
- Nikhef, Amsterdam
)

Apr 3, 2020

8 pages

Published in:

Mon.Not.Roy.Astron.Soc. 494 (2020) 4, 5110-5117

Published: Jun 1, 2020

e-Print:

2004.01726 [astro-ph.HE]

DOI:

10.1093/mnras/staa950 (publication)

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Abstract: (Oxford University Press)

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|

{_{.}^{\circ}}

|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 |

\alpha ^{610}_{144} \gtrsim

| −2.5. We also show that LOFAR can detect the afterglows of future binary neutron star merger events occurring at more favourable elevations.

Note:

9 pages, 2 figures, accepted for publication in MNRAS

gravitational waves
stars: neutron
radio continuum: stars

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