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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17430, 17431
Message-Id: <20251004071130.5034428806A7@server.astronomerstelegram.org>
Date: Sat,  4 Oct 2025 03:11:30 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17430							     ATEL #17430

Title:	NuSTAR follow up of the outburst of GRS 1739-278
Author:	Honghui Liu (Uni. of Tuebingen), Jiachen Jiang (Uni. of Warwick),
		Adam Ingram (Newcastle Uni.), Javier Garcia (GSFC), John Tomsick (UCB),
		James Steiner (CfA), Andrea Santangelo (Uni. of Tuebingen), Zuobin
		Zhang (Uni. of Oxford)
Queries:	honghui.liu@uni-tuebingen.de
Posted:	3 Oct 2025; 09:11 UT
Subjects:X-ray, Binary, Black Hole

GRS 1739-278 is an X-ray binary system with a black hole candidate discovered
in 1996 by the Granat satellite (Vargas et al. 1997, ApJ, 476, 23). It
went into a new outburst in 2025. We triggered a NuSTAR ToO observation,
which was conducted on 18 September 2025. The observation captured the
source in the soft state, with its spectrum dominated by thermal disk emission.
The inner disk temperature measured with the DISKBB model is approximately
0.9 keV and the normalization is around 1300. The spectrum also includes
a power-law component with a photon index of ~2.8, a high-energy cutoff
at ~40 keV and a normlization of around 0.39 (with CUTOFFPL). A broad iron
line and a Compton hump are also present, indicating the existence of a
reflection component. A quick fitting with the RELXILL model finds a similar
spin and inclination angle as in Draghis et al. 2024, ApJ, 969, 40. After
fitting these components, the residuals reveal an absorption line feature
at 7 keV, which might indicate absorption by a disk wind. Previous Chandra/HETG
observations only found an upper limit for such an absorption line (Parra
et al. 2024, A&A, 681, 49), but it appears quite significant in the NuSTAR
spectrum from this outburst. The 3-20 keV flux during the observation was
3.6e-9 erg/s/cm^2. Follow-up observations could help confirm the presence
of the disk wind. We thank the NuSTAR team for promptly scheduling the
observation.

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Password Certification: Honghui Liu (honghui.liu@uni-tuebingen.de)
https://www.astronomerstelegram.org/?read=17430
==============================================================================
ATEL #17431							     ATEL #17431

Title:	Correction to ATel #17430
Author:	Honghui Liu (Uni. of Tuebingen), Jiachen Jiang (Uni. of Warwick),
		Adam Ingram (Newcastle Uni.), Javier Garcia (GSFC), John Tomsick (UCB),
		James Steiner (CfA), Andrea Santangelo (Uni. of Tuebingen), Zuobin
		Zhang (Uni. of Oxford)
Queries:	honghui.liu@uni-tuebingen.de
Posted:	3 Oct 2025; 12:58 UT
Subjects:X-ray, Binary, Black Hole

We provide the uncertainties (for 90% confidence level) of parameters in
ATel #17430 here:

- The inner disk temperature from DISKBB: 0.893 \pm 0.008 keV 
- The normalization of DISKBB: 1270 \pm 40 
- The photon index of CUTOFFPL: 2.81 \pm 0.03 
- The cutoff energy of CUTOFFPL: 44 \pm 8 keV 
- The normalization of CUTOFFPL: 0.28_{-0.05}^{+0.4} 
- The 3-20 keV absorbed flux: (3.63 \pm 0.01)*10^9 erg/s/cm^2

The NuSTAR observation starts from 2025-09-18 16:46:08 with a exposure
of 15.8 ks.

NuSTAR follow up of the outburst of GRS 1739-278: https://www.astronomerstelegram.org/?read=17430
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Password Certification: Honghui Liu (honghui.liu@uni-tuebingen.de)
https://www.astronomerstelegram.org/?read=17431
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