文件操作 - 1774595297.M346888P5639.mail.planetcloud-host.com,S=8659,W=8811:2,

文件: /var/vmail/bicar.it/stefano/cur/1774595297.M346888P5639.mail.planetcloud-host.com,S=8659,W=8811:2,

编辑文件内容

Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=174.142.199.243; helo=server.astronomerstelegram.org; envelope-from=atel@astronomerstelegram.org; receiver=stefano@bicar.it 
To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel 17727, 17728, 17729
Message-Id: <20260327070752.8FE8B2880864@server.astronomerstelegram.org>
Date: Fri, 27 Mar 2026 03:07:52 -0400 (EDT)

------------------------------------------------------------------------------ 
The Astronomer's Telegram is free to read, free to publish, free to
use.  Thanks to the support of our patrons, we can continue to
keep it free. https://www.patreon.com/astronomerstel
------------------------------------------------------------------------------ 
The Astronomer's Telegram                   http://www.astronomerstelegram.org 
------------------------------------------------------------------------------
Posted: Within the last 24 hours
==============================================================================
ATEL #17727							     ATEL #17727

Title:	Einstein Probe detection of a new outburst from XTE 1739-285
		
Author:	Q. C. Zhao (IHEP), Z. H. Yang (IHEP), R. D. Liang (NAO, CAS),
		H. Sun(NAO, CAS), B. T. Wang (YNAO, CAS), X. H. Tang (Tsinghua University),
		Z. M. Wang (CAS) on behalf of the Einstein Probe team
Queries:	ep_ta@bao.ac.cn
Posted:	26 Mar 2026; 07:47 UT
Subjects:X-ray, Binary, Transient

We report the detection of a new outburst from XTE J1739-285 with the Wide-field
X-ray Telescope (WXT) onboard the Einstein Probe (EP). The source was discovered
in 1999 (Martkwardt et al. 1999) and has exhibited multiple outbursts since
then. Most recently, the source underwent an outburst in 2023 (ATel #15927).
EP/WXT first detected the current outburst on 2026 March 15, with a flux
of about 4.2 × 10-11 erg cm-2 s-1. Since
then, the source flux has continued to rise. The latest WXT spectrum can
be fitted with an absorbed power-law model, with a photon index of 2.7
+/- 0.5. The current unabsorbed flux in 0.5-4 keV is 9.2(+6.7,-3.3) ×
10-9 erg cm-2 s-1 (68% confidence level).
Further follow-up observations are encouraged.

Launched on January 9, 2024, EP is a space X-ray observatory designed to
monitor the soft X-ray sky with rapid X-ray follow-up capability (Yuan
et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics). EP is a mission
of the Chinese Academy of Sciences in collaboration with ESA, MPE, and
CNES.

------------------------------------------------------------------------------
Password Certification: Yuan Liu (liuyuan@bao.ac.cn)
https://www.astronomerstelegram.org/?read=17727
==============================================================================
ATEL #17728							     ATEL #17728

Title:	EP260324a: Einstein Probe detection of an X-ray transient
Author:	Q. Y. Wu (NAO, CAS), C. Y. Dai (NJU), B. T. Wang (YNAO, CAS),
		C. Y. Wang (THU), H. Z. Wu (HUST), H. W. Pan (NAO, CAS) on behalf
		of the Einstein Probe (EP) team
Queries:	ep_ta@bao.ac.cn
Posted:	26 Mar 2026; 14:17 UT
Subjects:X-ray, Transient

We report on the detection of an X-ray transient by the Wide-field X-ray
Telescope (WXT) on board the Einstein Probe (EP) mission during an observation
on 2026-03-24T07:04:20 (UTC), designated EP260324a. Analysis of this earliest
WXT observation shows that its spectrum can be fitted with a power-law
model, with the absorption column density fixed at the Galactic value of
3 x 10^20 cm^-2. The best-fit photon index is 1.4 (-0.4/+0.4), and the
unabsorbed flux in the 0.5-4 keV band is 3.9 (-1.0/+1.2) x 10^-11 erg/s/cm^2.
The transient was subsequently detected in multiple WXT observations over
the following ~1 day. In these detections, its X-ray flux were similar
to the earliest one, while the spectrum exhibited a gradual softening with
time.

A follow-up observation with the Follow-up X-ray Telescope (FXT) on-board
EP was performed on 2026-03-25T07:06:16 (UTC), with an exposure time of
2.6 ks. Analysis of the telemetry data reveals an uncatalogued X-ray source
within the WXT error circle, located at R.A., Dec. = 131.0547, 82.0202
(J2000), with an uncertainty radius of 10 arcsec (90% C.L.). Its spectrum
can be fitted with a power-law model, with the absorption column density
fixed at the Galactic value of  3 x 10^20 cm^-2. The best-fit photon index
is 2.64 (-0.02/+0.02), and the unabsorbed flux in the 0.5-10 keV band is
3.94 (-0.04/+0.04) x 10^-11 erg/s/cm^2.

The FXT source, with a positional uncertainty radius of 10 arcsec, is located
2.4 arcsec from a galaxy SDSS J084412.34+820110.9 at R.A., Dec. = 131.05146,
+82.01970 (J2000), for which photometric redshifts of 0.095 and 0.082 have
been reported in GLADE+ and DESI DR9, respectively. Assuming this association,
the observed FXT flux corresponds to a 0.5-10 keV X-ray luminosity of approximately
9 x 10^44 erg/s or 7 x 10^44 erg/s, respectively.

Further FXT follow-up observations have been arranged. And multi-band follow-up
observations are encouraged to identify the nature of this X-ray transient.

Launched on January 9, 2024, EP is a space X-ray observatory to monitor
the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook
of X-ray and Gamma-ray Astrophysics).

------------------------------------------------------------------------------
Password Certification: Yuan Liu (liuyuan@bao.ac.cn)
https://www.astronomerstelegram.org/?read=17728
==============================================================================
ATEL #17729							     ATEL #17729

Title:	A fast NIR flare and Historical NIR light maximum of the FSRQ
		PKS0748+126
Author:	L. Carrasco, R. Gonzalez, G. Escobedo, L. Felix , A. Porras,
		E. Recillas;(INAOE, Mexico)
Queries:	Carrasco@inaoep.mx
Posted:	27 Mar 2026; 02:45 UT
Subjects:Radio, Infra-Red, Gamma Ray, AGN, Blazar, Quasar

We report on the recent NIR brightening of the flat spectrum radio quasar
PKS0748+126, cross identified with the gamma-ray source 4FGL J0750.8+1229.
On March 25th, 2026 (JD 2461124.8284) we found the object undergoing a
historically bright NIR flare for the lapse of 16 years covered by our
observations. This maximum light was reached in a short lapse of 19 days.
On this date, the NIR fluxes in the JHK bands were: J=12.656+/-0.047, H=12.049+/-0.025
and Ks=11.322+/-0.039, respectively. These fluxes have doubled their values
with respect to our previous determination for them. Since, on JD2461105.7449
the NIR fluxes in those bands were: J=13.819+/-0.039, H=13.006+/-0.036
and Ks=12.109+/-0.022. Furthermore, NIR flux in the H band on JD 2458199.7319
had been H=16.093+/-0.04. Hence, the object has increased its luminosity
in the H band by a factor above of 40 in this 8 year time window. Our observations
are carried out with CANICA a NIR camera on the 2.1m telescope at the Observatorio
Astrofisico Guillermo Haro, operated by the National Institute for Astrophysics,
Optics and Electronics (INAOE, Mexico). We encourage further multiwavelength
observations.

------------------------------------------------------------------------------
Password Certification: LUIS CARRASCO (carrasco@inaoep.mx)
https://www.astronomerstelegram.org/?read=17729
==============================================================================

==============================================================================
This is an automatically-generated notice.  You can remove yourself permanently
from receiving both the Daily Email Digest and Instant Email Notices from
The Astronomer's Telegram by following this link:
https://www.astronomerstelegram.org?unsubscribe&confirmation=a803d34e7ea924f9a4142bac00763549&address=stefano@bicar.it

文件操作 - 1774595297.M346888P5639.mail.planetcloud-host.com,S=8659,W=8811:2,

文件: /var/vmail/bicar.it/stefano/cur/1774595297.M346888P5639.mail.planetcloud-host.com,S=8659,W=8811:2,

编辑文件内容

修改文件时间

删除文件