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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17489, 17490
Message-Id: <20251112071146.8C0A028808F0@server.astronomerstelegram.org>
Date: Wed, 12 Nov 2025 02:11:46 -0500 (EST)

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Posted: Within the last 24 hours
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ATEL #17489							     ATEL #17489

Title:	Confirmation of a glitch in PSR J1740-3015 using the upgraded
		Giant Metrewave Radio Telescope (uGMRT)
Author:	Himanshu Grover (IIT Roorkee, India), Bhal Chandra Joshi (NCRA-TIFR
		&amp; IIT Roorkee, India), M. A. Krishnakumar (NCRA-TIFR, India),
		P. Arumugam (IIT Roorkee, India)
Queries:	himanshu_g@ph.iitr.ac.in,bhalchandrajos@gmail.com,kk.ambalappat@gmail.com,arumugam@ph.iitr.ac.in
Posted:	11 Nov 2025; 08:12 UT
Subjects:Radio, Neutron Star, Star, Transient, Pulsar

We confirm the presence of a new glitch in pulsar J1740-3015/B1737-30,
recently reported by Shaw et  al. (ATel #17486). Our preliminary analysis,
based on a single post-glitch epoch around MJD 60987.39,  yields a fractional
spin-up in the rotational frequency, &Delta;F0/F0, of 2.6(1)E-6. The initial
estimate of the glitch epoch is consistent with Shaw et al. (ATel #17486),
at MJD 60980(5). A more  precise epoch will become available with additional
post-glitch observations.

We will continue to monitor this pulsar, as further follow-up observations
are important for refining  the post-glitch timing solution, studying the
glitch recovery, and investigating any associated  radiative changes. We
encourage other monitoring programs to continue their observations as well.

We thank the staff of the GMRT who made our observations possible. The
uGMRT is operated by the  National Centre for Radio Astrophysics of the
Tata Institute of Fundamental Research.

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Password Certification: Bhal Chandra Joshi (bcj@ncra.tifr.res.in)
https://www.astronomerstelegram.org/?read=17489
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ATEL #17490							     ATEL #17490

Title:	3I/ATLAS Still Single
Author:	David Jewitt, Jane luu
Queries:	djewitt@gmail.com
Posted:	11 Nov 2025; 19:55 UT
Subjects:Optical, Comet, Solar System Object

Images from the Nordic Optical Telescope on UT 2025 November 11 show that
3I/ATLAS continues as an active, single body, with no evidence for breakup
following the recent perihelion passage.  Asymmetries in the coma project
to position angles 106+/-10 degrees and 301+/-1 degrees.  The former is
close to the projected orbit (110 degrees) and sunward direction (115 degrees),
suggesting that it is the sunward fan observed on the inbound leg of the
orbit and consisting of large and slowly launched particles projected sunward
by dayside sublimation (c.f. 2025 Ap. J. Letters, 994 L3).  The latter
is close to the projected antisolar direction (295 degrees) on this date,
identifying it as a normal dust tail.  Plasma structures evident in recent
wide field pictures taken by others are not evident in our data presumably
because we used an R filter to isolate the dust, so excluding most gaseous
emission lines.  The heliocentric, geocentric distances and phase angle
on UT 2025 November 11 were 1.43 au, 2.16 au and 22 degrees, respectively.

Linked images show 3I/ATLAS with North to the top, East to the left, and
a region approximately 0.5 million km wide.  The projected antisolar direction
(-S) and negative heliocentric velocity vector (-V) are marked.  The diffuse
object to the upper left of 3I is a galaxy.  Other discrete objects are
stars.  The images are 1) linear stretch 2) contoured 3) color contoured
4) spatially filtered within a 0.13 million km radius region by subtracting
the median signal in concentric annuli centered on the brightest pixel.
The faint diagonal line from upper left to lower right is an "Elon".

3I UT 2025 Nov 11 -- NOT ALFOSC: https://faculty.epss.ucla.edu/~jewitt/NOTpictures.pdf
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