AstroNotes

We report a redshift z = 0.176 for the optical counterpart AT 2025kg (the "kangaroo") of the X-ray transient EP250108a. Its luminosity and extremely blue spectral shape suggest an FBOT classification…

We report that the transient AT2024tvd is an off-nuclear tidal disruption event.

We report SWIFT XRT and UVOT observations of a rapidly evolving transient, AT2024adec (ZTF24abvevzs).

FBOT AT2024wpp showed evidence for a rapid X-ray re-brightening and spectral hardening at ~50 days

NuSTAR hard X-ray detection of the FBOT candidate AT2024wpp

We report the confirmation of an X-ray detection for the rapidly rising (3 mag/day) and blue optical transient, AT 2024wpp.

We report photometry, spectroscopy, and X-ray observations of a rapidly rising (3 mag/day) and blue optical transient.

We report the NuSTAR detection of hard X-rays from the FBOT AT2024qfm and the evidence for soft X-ray variability from Swift-XRT

We present luminous optical, UV, X-ray, and radio detections of the fast transient AT2024kmq (z=0.192). The transient is spatially coincident with the nucleus of an early-type galaxy, and we consider…

We report observations of the blazar NVSS J004348+342626 with the Large Array Survey Telescope (LAST) during 4 nights, with the latest observations about 3 days before the detections in the X-ray ban…

We report the classification of the optical transient ZTF24aaoxmyb/AT 2024lhc as a likely tidal disruption event.

We report the classification of the optical transient ZTF20abwtifz/AT2020afhd (RA = 03:13:35.67, Dec = -02:09:06.21, z = 0.024) as a tidal disruption event (TDE) due to its persistent blue optical co…

We report the results of Swift X-ray observations of AT2023jxk.

We present a summary table of X-ray observations of the fast blue optical transient AT2022tsd for reference use in our submitted research note.

We report the Chandra X-ray detection of the luminous fast blue optical transient (LFBOT) AT2023fhn.

We report X-ray and millimeter-wave follow-up observations of the luminous fast blue optical transient (LFBOT) AT2023fhn.

We report the non-detection of 0.3-10 keV X-ray emission from the nearby (10 Mpc) stripped-envelope SN 2023dbc.

We report additional follow-up detections of X-ray emission from the fast blue optical transient AT2022tsd at z=0.256.

We report a Swift/XRT non-detection of the fast, blue, and luminous optical transient AT2023bbu.

We report ZTF forced photometry, Gemini spectroscopy, VLA radio observations, and Swift X-ray observations of the optical transient AT2022abfc. Observations reveal a fast optical duration of a few da…

Follow-up observations of the optical fast transient ZTF22acaruqr/AT2022adzb (Coughlin et al., AstroNote 2022-270) were carried out with the Neil Gehrels Swift Observatory starting on 2022-12-25 02:1…

We report the scheduling blocks for 40 ksec of Chandra X-ray observations of the luminous fast blue optical transient AT2022tsd, and encourage simultaneous multiwavelength observations.

We report the follow-up detection of fading X-ray emission with Chandra from the fast blue optical transient AT2022tsd at z=0.256.

We report the follow-up detection of persistent and luminous X-ray emission with Chandra from the fast blue optical transient AT2022tsd at z=0.256.

We report the discovery and classification of AT2022lri/ZTF22abajudi, a UV and X-ray bright tidal disruption event in a galaxy at z=0.032.

We report the detection of significant X-ray emission from the fast blue optical transient AT2022tsd at z=0.256.

We report the detection of X-ray emission at the position of the radio-loud fast optical transient AT2022tsd (z=0.256).

We report Swift/XRT detection of X-ray emission in the tidal disruption event (TDE) AT2021uvz/ZTF21abmwftm.

We report the detection of evolving radio emission from the TDE AT2021sdu.

We report ZTF, Keck, and Swift observations of the X-ray bright tidal disruption event (TDE) ZTF21abqhkjd/AT2021uqv.

We report VLA, SRG, and Swift observations of the fast-fading luminous transient AT2021tnj.

We report Swift/XRT detection of X-ray emission in the tidal disruption event (TDE) AT2021ehb/ZTF21aanxhjv.

Using VLT/X-shooter we confirm the redshift determination of z=1.5105 (Andreoni et al. 2021 ATel #14641) of the potential host galaxy of the fast X-ray transient XRT210423. The offset and peak lumino…

We report the detection of luminous X-ray emission from AT2021lfa, with a luminosity typical of long-duration GRB afterglows.

We report the first X-ray detection of SN2020tcw with the Chandra X-ray Observatory (CXO) at 60 days post-discovery.

We report UV/optical and X-ray observations of the fast, luminous blue transient ZTF21aakilyd/AT2021csp.

We report the detection of significant X-ray emission from the fast blue optical transient AT2020xnd at z=0.2442.

Here we present Swift observations and spectroscopic classification of OGLE19qem. The object was not detected in X-rays. UVOT colours suggests a temperature around 7000 K, while the spectral features…

We report optical, UV and X-ray data of this rapidly evolving event. The nature of the event can not yet be determined, additional immediate followup is encouraged.