文件操作 - 1743837077.M563037P17499.mail.planetcloud-host.com,S=6556,W=6680:2,

文件: /var/vmail/bicar.it/stefano/cur/1743837077.M563037P17499.mail.planetcloud-host.com,S=6556,W=6680:2,

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  17130, 17131
Message-Id: <20250405071113.C28E3288099A@server.astronomerstelegram.org>
Date: Sat,  5 Apr 2025 03:11:13 -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 #17130							     ATEL #17130

Title:	A new small glitch in the PSR J1731-4744 (PSR B1727-47) pulsar
Author:	E. Zubieta (IAR), S. B. Araujo Furlan (IATE), S. del Palacio
		(Chalmers University of Technology, IAR), F. Garcia (IAR), G. Gancio
		(IAR), C. O. Lousto (RIT), J. A. Combi (IAR, FCAGLP, UJA), on behalf
		of the PuMA Collaboration
Queries:	ezubieta@iar.unlp.edu.ar
Posted:	4 Apr 2025; 19:57 UT
Subjects:Radio, Neutron Star, Pulsar

Since 2018, the Pulsar Monitor in Argentina (<a href="https://puma.iar.unlp.edu.ar/">PuMA</a>)
collaboration has been carrying out a pulsar timing program, observing
a series of pulsars from the Southern Hemisphere with up to daily cadence.
Observations are performed using the two 30-m antennas at the Argentine
Institute of Radioastronomy (IAR), using two ROACH receivers with a bandwidth
of 400 MHz centered at 1.4 GHz.

For PSR J1731-4744 (PSR B1727-47), six glitches have been reported so far,
the latter in MJD 57984 (<a href="http://www.jb.man.ac.uk/pulsar/glitches/gTable.html">see
JB Catalogue</a>). Three of them were small glitches, with dF/F approx.
1e-9, two of the order of 1e-7, and one giant glitch with a relative frequency
jump of approx. 1e-6.

Here we report on a new small glitch event recently detected in our timing
data. Our preliminary analysis shows a sudden change in its rotation frequency
(1.2048707 Hz) that occurred between MJD 60750.35 and MJD 60752.35, with
a relative amplitude dF0/F0 = 1.69(4)E-8, accompanied by a relative change
in spin-down rate dF1/F1 = 0.010(3).

The top panel of the attached <a href="https://pugliese.iar.unlp.edu.ar/images/Atel2025J1731-4744.png">Figure</a>
shows the timing residuals obtained without fitting for the glitch, while
the bottom panel shows the residuals after fitting for the sudden changes
in F0 and F1 reported above.

We will continue to monitor this pulsar. We encourage other observers to
help resolve the pulsar post-glitch behaviour.

------------------------------------------------------------------------------
Password Certification: Ezequiel Zubieta (ezubieta@iar.unlp.edu.ar)
https://www.astronomerstelegram.org/?read=17130
==============================================================================
ATEL #17131							     ATEL #17131

Title:	Discovery of a Probable Nova in M81
Author:	K. Hornoch (Ondrejov), H. Kucakova (Charles University), A.
		W. Shafter (SDSU)
Queries:	k.hornoch@centrum.cz
Posted:	5 Apr 2025; 00:52 UT
Subjects:Optical, Nova, Transient

We report the discovery of a probable nova in M81 on a co-added 1500-s
unfiltered CCD frame taken on 2025 Apr. 4.134 UT with the 0.65-m telescope
at Ondrejov.

The object designated PNV J09553921+6902382 is located at R.A. = 9h55m39s.21,
Decl. = +69o02'38".2 (equinox 2000.0), which is 32.4" east and 76.9" south
of the center of M81 (see link to discovery image below).

Here we list the observing dates and corresponding photometry:

<span class="inner-pre" style="font-size: 13px"> 
Date [UT]    |  Mag   | Err  | Filter  | Telescope

2025-03-28.143 | >20.9  |      | C       | OND 
2025-04-04.134 |  19.6  | 0.15 | C       | OND

</span>

As with all extragalactic novae, follow-up spectroscopic and photometric
observations to determine the nova's spectroscopic class and rate of decline
(speed class) are encouraged. The OND 0.65-m is a reflecting telescope
at the Ondrejov observatory operated jointly by the Astronomical Institute
of ASCR and the Astronomical Institute of the Charles University of Prague,
Czech Republic. It uses a Moravian Instruments G2-3200 MkII CCD camera
(with a Kodak KAF-3200ME sensor and standard BVRI photometric filters)
mounted at the prime focus. The unfiltered OND photometry was calibrated
against R-band comparison stars from 
<a href="http://adsabs.harvard.edu/abs/1995AJ....109.1055P">Perelmuter
& Racine (1995)</a>.

Discovery image: http://www.asu.cas.cz/~asteroid/PNV_J09553921+6902382.png
------------------------------------------------------------------------------
Password Certification: Allen W. Shafter (ashafter@sdsu.edu)
https://www.astronomerstelegram.org/?read=17131
==============================================================================

==============================================================================
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 - 1743837077.M563037P17499.mail.planetcloud-host.com,S=6556,W=6680:2,

文件: /var/vmail/bicar.it/stefano/cur/1743837077.M563037P17499.mail.planetcloud-host.com,S=6556,W=6680:2,

编辑文件内容

修改文件时间

删除文件