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From: atel@astronomerstelegram.org
Subject: ATel  17553, 17554
Message-Id: <20251223071145.6225328804FC@server.astronomerstelegram.org>
Date: Tue, 23 Dec 2025 02:11:45 -0500 (EST)

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Posted: Within the last 24 hours
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ATEL #17553							     ATEL #17553

Title:	Optical Flaring of FSRQ B1020+292
Author:	Miljana D. Jovanovic (Astronomical observatory, Belgrade,
		Serbia), Goran Damljanovic (Astronomical observatory, Belgrade, Serbia),
		Irina Cvetkovic (Faculty of Mathematics, University of Belgrade, Serbia)
Queries:	miljana@aob.rs
Posted:	22 Dec 2025; 10:58 UT
Subjects:Optical, AGN, Quasar

We report activity of FSRQ B1020+292 (ICRS J2000 coords. R.A.: 10 23 24.046
Dec.: +28 56 50.986 (Gaia Collaboration 2022, VizieR On-line Data Catalog:
I/355)) and z=0.667572 &plusmn; 0.000404 (Hewett & Wild 2010, MNRAS, 405,
2302). In the CGRaBS catalog (Healey, S. E. et al. 2008, ApJS, 175) the
source has R-band brightness of 20.57 mag.

The source showed an increase in R-band brightness from 20.064 mag in early
June 2024, to 19.407 mag on December 14, 2025 (on the same day the brightness
in the V-band was 19.795 mag).

We present the following magnitudes:

JD 2460468.36218: 20.064 &plusmn; 0.010

JD 2461024.56086: 19.407 &plusmn; 0.069

JD 2461024.55946: 19.795 &plusmn; 0.049

Comparison stars and their magnitudes were chosen from SDSS DR14 catalogue.
The PSF-ugriz magnitudes were transferred to Johnson-Cousins V, and R magnitudes
using transformations from paper Chonis & Gaskell 2008, AJ, 135, 264.

Comparison stars numbers, R.A. (2000.0), Dec (2000.0), V-band, and R-band
magnitude:

1, 155.85193, 28.98720, 15.541 &plusmn; 0.033, 14.836 &plusmn; 0.046

2, 155.91129, 28.91174, 15.234 &plusmn; 0.026, 14.810 &plusmn; 0.030

3, 155.82951, 28.93782, 16.969 &plusmn; 0.027, 16.502 &plusmn; 0.034

4, 155.83529, 28.95989, 18.104 &plusmn; 0.039, 17.199 &plusmn; 0.071

Photometric measurements were taken with 1.4 m telescope located at Astronomical
observatory Vidojevica, of Astronomical observatory Belgrade, Serbia. Data
were acquired through Johnson-Cousins V, and R-bands and Andor iKon-L 936
CCD camera.

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Password Certification: Miljana Jovanovic (miljana@aob.rs)
https://www.astronomerstelegram.org/?read=17553
==============================================================================
ATEL #17554							     ATEL #17554

Title:	Spectroscopic Classification of AT2025agby with Keck II + KCWI
Author:	R. Kaur, K. W. Davis, R. J. Foley (UCSC)
Queries:	ravkaur@ucsc.edu
Posted:	22 Dec 2025; 18:22 UT
Subjects:Optical, Supernovae, Transient

We report the classification of AT2025agby from spectroscopic observations
with the Keck Cosmic Web Imager (KCWI) on the Keck II telescope obtained
on 2025 December 16 UT. The targets was supplied by SNHunt. The target
was identified using the target management platform YSE-PZ (Coulter et
al., 2023, PASP, 135, 4501). The classification was performed with SNID
(Blondin & Tonry, 2007, ApJ, 666, 1024).

Internal Name | IAU Name   | RA (J2000)   | Dec (J2000)  |   z      | Type
|  Phase   | Notes 
Not reported  | AT2025agby | 02:25:43.241 | +37:14:18.69 | 0.036902 | LBV/SN
IIn |          | (1)

Notes: 
When the redshift is given to 2 decimal places, it is derived from the
SN spectrum. Otherwise, the redshift is determined from the host galaxy.

(1) The spectrum has several strong, narrow (FWHM ~ 600 km/s) H emission
lines. We note that the object is offset from its host galaxy by ~24 kpc
in projection, and at an intermediate luminosity between what is typical
for SNe IIn and LBV-like outbursts. Follow-up observations are encouraged.

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Password Certification: Ryan Foley (foley@ucsc.edu)
https://www.astronomerstelegram.org/?read=17554
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