https://www.astronomerstelegram.org Quasar, from The Astronomer's Telegram en-us https://www.astronomerstelegram.org/?read=18095 L. Carrasco, A. Porras,L. Felix, G. Escobedo, E. Recillas L. Carrasco, A. Porras,L. Felix, G. Escobedo, E. Recillas Carrasco@inaoep.mx Credentialed by: LUIS CARRASCO (carrasco@inaoep.mx) The Astronomer's Telegram ATel18095 We report on the recent NIR flare of the intermediate redshift Blazar CGRaBSJ1751+0939 (z= 0.322) also known as QSO OT081, cross-correlated with the gamma ray source 4FGLJ1751.5+0938. ... 2026-10-08T12:02:57-00:00 https://www.astronomerstelegram.org/?read=18093 V. V. Vlasyuk, O. I. Spiridonova V. V. Vlasyuk, O. I. Spiridonova mosk@sao.ru Credentialed by: Alexander Moskvitin (mosk@sao.ru) The Astronomer's Telegram ATel18093 The compact steep-spectrum (CSS) quasar 3C 138 exhibits increasing optical activity in October. After reaching local maximum R = 15.44 +/- 0.02 mag at September 12/13 night (MJD 61296.0) (see ATel#18047) the quasar faded to value R = 16.58 +/- 0.01 mag within 10 days. ... 2026-10-07T22:57:13-00:00 https://www.astronomerstelegram.org/?read=18081 P. Monti-Guarnieri, C. C. Cheung, P. Van Zyl, on behalf of the Fermi Large Area Telescope Collaboration P. Monti-Guarnieri, C. C. Cheung, P. Van Zyl, on behalf of the Fermi Large Area Telescope Collaboration pietro.monti-guarnieri@phd.units.it Credentialed by: Giovanni La Mura (giovanni.lamura@inaf.it) The Astronomer's Telegram ATel18081 The Large Area Telescope (LAT), one of the two instruments onboard the Fermi Gamma-ray Space Telescope, has observed enhanced gamma-ray activity from a source positionally consistent with the flat-spectrum radio quasar PKS 1743+173, also known as FL16Y J1745.7+1720 (Ballet et al. ... 2026-09-24T20:11:58-00:00 https://www.astronomerstelegram.org/?read=18066 S. Wagner, P. Monti-Guarnieri, Giovanni La Mura on behalf of the Fermi Large Area Telescope Collaboration S. Wagner, P. Monti-Guarnieri, Giovanni La Mura on behalf of the Fermi Large Area Telescope Collaboration swagner@ifae.es Credentialed by: Sarah Wagner (swagner@ifae.es) The Astronomer's Telegram ATel18066 The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed enhanced gamma-ray activity from a source positionally consistent with the BL Lac GB6 J0128+4901, also known as IVS B0125+487 or 4FGL J0127.9+4857 (Abdollahi et al. ... 2026-09-21T17:22:12-00:00 https://www.astronomerstelegram.org/?read=18061 Kirill Sokolovsky, Katie Barnhart, Darien Perla, Pragati Acharya, John Worley, Anthony Pearce, Vallia Antoniou, Elias Aydi Kirill Sokolovsky, Katie Barnhart, Darien Perla, Pragati Acharya, John Worley, Anthony Pearce, Vallia Antoniou, Elias Aydi kirx@kirx.net Credentialed by: Kirill Sokolovsky (kirx@scan.sai.msu.ru) The Astronomer's Telegram ATel18061 An unusual rapid optical brightening of the blazar IVS B0125+487 (GB6 J0128+4901; z=0.067 Marcha et al. 1996, MNRAS 281, 425) was observed by the NMW-TexasTech transient survey. ... 2026-09-19T18:02:09-00:00 https://www.astronomerstelegram.org/?read=18052 V. V. Vlasyuk, O. I. Spiridonova V. V. Vlasyuk, O. I. Spiridonova mosk@sao.ru Credentialed by: Alexander Moskvitin (mosk@sao.ru) The Astronomer's Telegram ATel18052 The flat-spectrum radio quasar S5 1044+71 demonstrate continuing optical activity over whole last year. As was reported in ATel #17715, this source reached an R band magnitude of 16.25 +/- 0.01 in the early March. ... 2026-09-17T12:13:40-00:00 https://www.astronomerstelegram.org/?read=18047 V. V. Vlasyuk, O. I. Spiridonova V. V. Vlasyuk, O. I. Spiridonova mosk@sao.ru Credentialed by: Alexander Moskvitin (mosk@sao.ru) The Astronomer's Telegram ATel18047 The compact steep-spectrum (CSS) quasar 3C 138 demonstrate renewed activity in optical range (R band) since 2026 August, being started from R=16.43 mag level at end of July (MJD 61249). ... 2026-09-16T00:51:12-00:00 https://www.astronomerstelegram.org/?read=18044 Dirk Grupe, S. Komossa, L. Gallo, Jon M. Miller Dirk Grupe, S. Komossa, L. Gallo, Jon M. Miller dgrupe007@gmail.com Credentialed by: Dirk Grupe (dgrupe007@gmail.com) The Astronomer's Telegram ATel18044 We report on the discovery of the Narrow-Line Seyfert 1 (NLS1) galaxy Mkn 335 in its brightest X-ray state in more than a decade. The NASA Neil Gehrels Swift mission observed Mkn 335 on 2026 September 11 as part of a GI program (PI J.M. ... 2026-09-15T17:37:04-00:00 https://www.astronomerstelegram.org/?read=18043 Michel Dennefeld, Christophe Adami & Delphine Russeil, Tapio Pursimo Michel Dennefeld, Christophe Adami & Delphine Russeil, Tapio Pursimo dennefel@iap.fr Credentialed by: Michel Dennefeld (dennefel@iap.fr) The Astronomer's Telegram ATel18043 We present further classifications of Gaia Alerted (Hodgkin et al. 2021, A & A, 652, 76) QSO candidates, observed at Haute-Provence Observatory, following previous ATels (15138 and following). ... 2026-09-15T08:52:41-00:00 https://www.astronomerstelegram.org/?read=18013 A. Holzmann Airasca and P. Monti-Guarnieri, on behalf of the Fermi Large Area Telescope Collaboration A. Holzmann Airasca and P. Monti-Guarnieri, on behalf of the Fermi Large Area Telescope Collaboration a.holzmannairasca@unitn.it Credentialed by: Giovanni La Mura (giovanni.lamura@inaf.it) The Astronomer's Telegram ATel18013 In ATel #17968, we reported the Fermi-LAT detection of renewed activity from the flat-spectrum radio quasar 3C 395, with a daily averaged gamma-ray flux (E > 100MeV) of (3.2+/-0.3) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only), observed on August 15, 2026. ... 2026-08-26T15:30:19-00:00