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Date: Wed, 13 Aug 2025 03:09:39 -0400
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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17329

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Posted: Within the last 24 hours
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ATEL #17329							     ATEL #17329

Title:	The MeerKAT radio detection of SAX J1808.4-3658 2025 outburst
Author:	Kelebogile Gasealahwe (UCT, SAAO), Rob Fender (Oxford, UCT),
		Francesco Carotenuto (INAF-OAR) and Andrew Hughes (Oxford) on behalf
		of the XKAT collaboration
Queries:	kelebogilevsb001@gmail.com
Posted:	12 Aug 2025; 14:50 UT
Subjects:Radio, X-ray, Binary, Neutron Star, Transient

The Accreting millisecond X-ray Pulsar (AMXP), SAX J1808.4-3658, experiences
outbursts every 2-4 years. Following the XB-NEWS report on the 6th August
2025 (Atel #17323) about optical brightening of the source, we triggered
radio follow-up with MeerKAT L-band.

On the 7th August 2025 we observed SAX J1808.4-3658 at 1.28 GHz with flux
calibrator J1939-6342 and phase calibrator J1830-3602. After a 15 mins
long observation starting at 19:07 UTC, the data was imaged using Oxkat
(Heywood 2020, 2020ascl.soft09003H). Using PyBDSF methods (Mohan & Rafferty
2015, 2015ascl.soft02007M) we fit the source with an elliptical Gaussian
consisting of free parameters and measured a preliminary flux density of
0.50 &plusmn 0.02 mJy/beam.

We will continue to monitor the outburst with MeerKAT and Swift as part
of the XKAT collaboration.

We would like to thank the MeerKAT observing staff for the rapid response
in scheduling the observation. The MeerKAT telescope is operated by SARAO,
which is a facility of the National Research Foundation, an agency of the
Department of Science and Innovation.

X-KAT is a large MeerKAT open-time programme to observe X-ray binaries
in the radio band, performing weekly monitoring of bright, active systems,
with capacity for higher cadence observations, and in coordination with
large X-ray and optical monitoring programmes. For further information
on this programme contact Rob Fender and Sara Motta. The Swift follow-up
of X-ray binaries is largely performed as part of the SwiftKAT program,
which provides quasi simultaneous X-ray coverage of the X-KAT targets.

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