文件操作 - 1765005084.M533035P18170.mail.planetcloud-host.com,S=6322,W=6456:2,

文件: /var/vmail/bicar.it/stefano/cur/1765005084.M533035P18170.mail.planetcloud-host.com,S=6322,W=6456:2,

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  17526, 17527
Message-Id: <20251206071118.23DF22880815@server.astronomerstelegram.org>
Date: Sat,  6 Dec 2025 02:11:18 -0500 (EST)

------------------------------------------------------------------------------ 
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 #17526							     ATEL #17526

Title:	Recurrent nova M31N 2008-12a: Swift/XRT detection of the SSS
		following the 2025 eruption
Author:	M. J. Darnley (LJMU), K. L Page (U. Leicester)
Queries:	M.J.Darnley@ljmu.ac.uk
Posted:	5 Dec 2025; 10:27 UT
Subjects:X-ray, Nova

The 2025 eruption of the annual recurrent nova M31N 2008-12a was first
reported in ATel #17511 (also see ATel #17514, #17520, #17521, #17524).
Target of opportunity observations by the Neil Gehrels Swift Observatory
began shortly after the eruption was confirmed (and continue).

Data collected 4.8 days after the eruption (see timing estimation from
ATel #17514) show the emergence of the supersoft X-ray source (SSS) phase
of the 2025 eruption. In the corresponding Swift snapshot an X-ray source
with a count rate of 3.0 +0.9/-0.7 milli-counts per second was detected.

The previous snapshot, taken just 0.2 days earlier revealed a non-detection
(0 photons).

The timing of the 2025 SSS and the spectrum (albeit based on only 8 photons)
is consistent with all previous eruptions.

We thanks the Swift PIs, duty scientists and science planners for their
rapid approval and scheduling of these observations.

------------------------------------------------------------------------------
Password Certification: Matt Darnley (matt_darnley@icloud.com)
https://www.astronomerstelegram.org/?read=17526
==============================================================================
ATEL #17527							     ATEL #17527

Title:	Pre-discovery measurements of probable symbiotic nova AT 2025abao
		in M31
Author:	Juan Fabregat (OAUV), Vicent Peris (OAUV), Alicia Lozano,
		Juan Conejero (PixInsight)
Queries:	juan.fabregat@uv.es
Posted:	5 Dec 2025; 15:36 UT
Subjects:Optical, Cataclysmic Variable, Nova, Transient

We announce pre-discovery measurements of probable symbiotic nova in M31
AT 2025abao (ATEL #17476). Our images were acquired on the nights of October
13 to 14 and 14 to 15 at AstroCamp telescope hosting in Spain with a Planewave
DeltaRho 350 telescope (35 cm f3, 29 cm effective aperture). The images
show the nova already exploding in luminance and H-alpha filters on Oct.
13 and RGB and Johnson I on Oct. 14.

Being a photographic telescope, the nova was imaged with photographic filters.
We used the APASS catalog to calibrate the photometry in RGB filters, using
the catalog magnitudes closer to our filter bandpasses:

B -> Johnson B

G -> Johnson V

R -> SDSS r'

To calibrate the photometry in the luminance filer we used the Gaia BP
filter.

We also took 9x10 min exposures in H-alpha on the Oct. 13 night. Using
a 60-hour exposure image taken at the Observatorio de Aras de los Olmos
in Spain with a 14 cm f2.8 telescope in 2021, we have been able to measure
the increment in brightness in the H-alpha band from the nova baseline
state. To measure it, we calculated the zero point of both H-alpha images
using the APASS catalog SDSS r' magnitudes and compensated the bandwidth
difference in both images (5 nm in the 2021 image vs 3.5 nm in the 2025
image). In Oct. 13, the nova presented a brightness increment in the H-alpha
band of 0.54 magnitudes for a 5 nm bandwidth.

The average magnitudes and their associated uncertainties are below:

Oct. Day  Bandpass   Magnitude

13.886    Gaia BP    18.995 +-0.059

14.895    Johnson B  19.730 +-0.058

14.909    Johnson V  18.612 +-0.069

14.917    SDSS r'    18.068 +-0.069

15.107    Johnson I  17.235 +-0.065

For further analysis, we provide a table with all the measurement, the
calibrated images from the AstroCamp and Aras de los Olmos observatories,
and the filter transmission curves in the following link:

http://observatori.uv.es/AT2525abao/AT2025abao_data.zip

------------------------------------------------------------------------------
Password Certification: Juan Fabregat (juan.fabregat@uv.es)
https://www.astronomerstelegram.org/?read=17527
==============================================================================

==============================================================================
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 - 1765005084.M533035P18170.mail.planetcloud-host.com,S=6322,W=6456:2,

文件: /var/vmail/bicar.it/stefano/cur/1765005084.M533035P18170.mail.planetcloud-host.com,S=6322,W=6456:2,

编辑文件内容

修改文件时间

删除文件