# AC2026OSJ at 13.3 ( instead of ~19) **URL:** \ **Category:** Latest transients\ **Created:** [June 27, 2026, 3:42pm UTC](https://forum.astro-colibri.science/t/ac2026osj-at-13-3-instead-of-19/537 "2026-06-27T15:42:37Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![irzyk.michael](https://avatars.discourse-cdn.com/v4/letter/i/e47774/32.png) [@irzyk.michael](https://forum.astro-colibri.science/u/irzyk.michael)\ **Post date:** [June 27, 2026, 3:42pm UTC](https://forum.astro-colibri.science/t/ac2026osj-at-13-3-instead-of-19/537/1 "2026-06-27T15:42:37Z")
Dear all, Tonight ( 26june2026), I had a 2hours exposure ( Gaia Clear Filter) with a C14 . 4FGL J1422.5+3223, astrocolibi ID AC 2026osj ( FlaapLUC / Fermi-LAT) expected to catch a faint glow from this object ( At this coordinate, simbad is providing this : [ICRF J142230.3+322310](https://simbad.cfa.harvard.edu/simbad/sim-id?Ident=%404130643&Name=ICRF%20J142230.3%2B322310&submit=submit) and [MASTER OT J142230.38+322310.6](https://simbad.cfa.harvard.edu/simbad/sim-id?Ident=%4015316428&Name=MASTER%20OT%20J142230.38%2B322310.6&submit=submit) ) It appears that the object was measured at mag 13.3 . The object is easely visible on 60s single exposure. ![AC2026OSJ_visu3](https://canada1.discourse-cdn.com/flex007/uploads/astro_colibri/original/1X/823c515da03c202f1ca69579bf78381b3c2ec5fe.jpeg) ![AC2026OSJ_visu2](https://canada1.discourse-cdn.com/flex007/uploads/astro_colibri/original/1X/11542d541c99cd87503612c663e03fc4e2a36276.jpeg) ![AC2026OSJ_visu1](https://canada1.discourse-cdn.com/flex007/uploads/astro_colibri/original/1X/86b6f8cf780bd7f94479d05a2f8cfce5a509b753.jpeg) ---
**Author:** ![Fabian.Schussler](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.astro-colibri.science/fabian.schussler/32/25_2.png) [@Fabian.Schussler](https://forum.astro-colibri.science/u/Fabian.Schussler)\ **Post date:** [June 27, 2026, 3:51pm UTC](https://forum.astro-colibri.science/t/ac2026osj-at-13-3-instead-of-19/537/2 "2026-06-27T15:51:51Z")
Hi! Congrats! For context: _FlaapLUC / Fermi-LAT_ alerts are denoting flares of high-energy gamma-rays. In this case, the gamma-rays are associate to a Seyfert Galaxy at a redshift of z=0.681 as identified via your SIMBAD search. Monitoring of these objects during their flaring phases would provide interesting scientific information (e.g. we can study the correlations between the optical and gamma-ray emission, etc.). Maybe the weather (and your time) allows for that? ---
**Author:** ![irzyk.michael](https://avatars.discourse-cdn.com/v4/letter/i/e47774/32.png) [@irzyk.michael](https://forum.astro-colibri.science/u/irzyk.michael)\ **Post date:** [June 28, 2026, 12:40pm UTC](https://forum.astro-colibri.science/t/ac2026osj-at-13-3-instead-of-19/537/3 "2026-06-28T12:40:49Z")
> [@Fabian.Schussler](#): > > Maybe the weather (and your time) allows for that? Hi, \>Maybe the weather (and your time) allows for that? I got storm this night ☹ 🌧 ---
**Author:** ![irzyk.michael](https://avatars.discourse-cdn.com/v4/letter/i/e47774/32.png) [@irzyk.michael](https://forum.astro-colibri.science/u/irzyk.michael)\ **Post date:** [July 13, 2026, 3:47pm UTC](https://forum.astro-colibri.science/t/ac2026osj-at-13-3-instead-of-19/537/4 "2026-07-13T15:47:03Z")
Follow up by 9 July 2026 : Using RAPAS filter, A ![AC2026OSJ_color](https://canada1.discourse-cdn.com/flex007/uploads/astro_colibri/original/1X/dc1de33ab34506514ee328e7d6c9f7d953a66b93.jpeg) AC2026osj has been measured with following results : 09/july/2026 - 21:07:41.820 Mag G : 12.7 +/- 0.05 09/07/2026 - 21:13:33.010 Mag Gbp : 13.18 +/- 0.06 09/07/2026 - 21:19:05.410 Mag Grp : 12.1 +/- 0.2 1 ---
**Author:** ![irzyk.michael](https://avatars.discourse-cdn.com/v4/letter/i/e47774/32.png) [@irzyk.michael](https://forum.astro-colibri.science/u/irzyk.michael)\ **Post date:** [July 13, 2026, 4:04pm UTC](https://forum.astro-colibri.science/t/ac2026osj-at-13-3-instead-of-19/537/5 "2026-07-13T16:04:37Z")
Follow up 12 july 2026, 23h30TU Using RAPAS Star’ex\_VLR ( R=200) spectrograph a 2h exposure has been performed on a d=150mm f=750mm newton, providing a clear spectra of the source ( even if strong light pollution and atmospheric emission/absorption are visible). ![AC2026osj_12juillet2026_23h30_1](https://canada1.discourse-cdn.com/flex007/uploads/astro_colibri/original/1X/c59ce6afb7bd021285d51c08e4f70f2c4eb7ebda.jpeg) The resulting spectra appears very flat, without emission lines, and unfortunately, do not provide specific information. ![ac2026osj_12juillet2026_23h30_graph_1](https://canada1.discourse-cdn.com/flex007/uploads/astro_colibri/original/1X/e072bcb170074a14c586759b76895bbe2423a783.png) Michael Note : Field of spectrograph guider : ![spectro_field_of_AC2026osj](https://canada1.discourse-cdn.com/flex007/uploads/astro_colibri/original/1X/f412f2e6a93e2ba04b9fb45bb671dd2a29aa03a0.jpeg) ---
**Author:** ![Fabian.Schussler](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.astro-colibri.science/fabian.schussler/32/25_2.png) [@Fabian.Schussler](https://forum.astro-colibri.science/u/Fabian.Schussler)\ **Post date:** [July 14, 2026, 7:17am UTC](https://forum.astro-colibri.science/t/ac2026osj-at-13-3-instead-of-19/537/6 "2026-07-14T07:17:46Z")
Congrats! The flat, featureless spectrum is expected for this kind of sources: it is dominated by synchrotron radiation from high-energy relativistic electrons spiraling around magnetic fields in the jet. The blazar is still in an excited state (see the gamma-ray lightcurve in [Astro-COLIBRI](https://astro-colibri.com/event:4FGL%20J1422.5%2B3223?science_mode=true), so the jet emission dominates over the host galaxy. As mentioned, monitoring of the flux and spectral evolution continues to be interesting because one could correlate it with the gamma-ray emission.