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Swift ATels - 2021
Most recent ATels are listed at the top of the page.
- Swift detection of the blazar OJ 287 in a deep UV-optical low-state in the course of the MOMO program
- New giant radio flare from Cygnus X-3
- Additional Bursts from SGR 1935+2154 Seen by Swift BAT (Erratum)
- Optical-to-X-ray Flare in Markarian 501
- Re-brightening of the BL Lac object PKS 0735+178 observed by Swift
- The Ongoing X-Ray Flare in Markarian 501
- Search for the X-ray counterpart to IceCube-211216A event with Swift (Erratum)
- Swift follow-up observations of AT2021afpi / MASTER OT J030227.28+191754.5 (Correction)
- Swift XRT/UVOT rapid follow-up of bright FRB 20211211A
- V1405 Cas is now a faint Super-Soft Source
- Swift monitoring of the BL Lac object PKS 0735+178 during a bright state
- Swift-XRT observations of the blazar PKS 0735+178 in a flaring state
- Swift observations of long X-ray flaring activity from the blazar PKS 0903-57
- Fermi-LAT and Swift observations of flaring activity from the FSRQ PKS 0346-27
- Dwarf Nova AT2021afpi: X-ray Observations
- Classical nova AT2021afpi, a possible EM counterpart to IC211125A, is in X-ray outburst
- The Onset of X-Ray Flare in the TeV-Detected Blazar Markarian 501
- Swift follow-up of the flaring blazar PKS 0903-57
- Swift XRT/UVOT rapid follow-up of bright FRB 20211122A
- SXP 15.6: New outburst detection by S-CUBED, with NICER and SALT followup
- Recurrent nova M31N 2008-12a: Swift/XRT detection of the 2021 eruption
- Swift detection of record X-ray flare of the AGN PKS 0521-36
- Recurrent Nova M31N 2008-12a: Swift UVOT detection of the 2021 eruption
- Swift follow-up observations of the AGN PKS 0521-36
- Swift monitoring of the high-z FSRQ PKS 0438-43
- Fermi-LAT and Swift observations of flaring activity from the FSRQ PKS 0301-721
- UVOT detection of UV outburst from an unidentified source
- Swift follow-up observations of the flaring blazar TXS 0646-176
- Swift non-detection of MAXI J1735-272
- S-CUBED confirmation of 22.3 day orbital period of XMMU J010429.4-723136 / SXP 164
- INTEGRAL, NICER and Swift confirm the re-brightening of V4641 Sgr
- Swift-XRT detection of the candidate white dwarf pulsar ZTF J185139.81+171430.3
- Swift observations of the super-soft nova ASASSN-21fh
- New X-ray transient Swift J162315.0-175233: a possible counterpart to Fermi J1623-1752
- Swift Observations of ASASSN J205543.90+240033.5
- Monitoring the X-ray spectra and pulse profile evolution of the Be X-ray binary EXO 2030+375 during the giant outburst of 2021
- Swift observations identified the X-ray transient MAXI J1909+094 as 4U 1907+09
- Swift follow-up observations of the flaring millimeter-band source SPT-SJ010023-4357.1
- RS Oph has entered the Supersoft phase
- Swift follow-up observations of the blazar PKS 0420-014
- Swift J1555.2-5402 : More SGR bursts seen by BAT
- Possible start of the supersoft source phase in RS Oph
- Swift observations and continued spectroscopy/photometry of nova V5856 Sgr trapped in persistent nuclear burning five years past the 2016 outburst
- Enhanced X-Ray Activity of the southern TeV-Detected Blazar PKS 2155-304
- Early Swift-XRT observations of the 2021 eruption of RS Oph
- Further monitoring of FRB 20201124A with Swift
- Detection of flaring very-high-energy gamma-ray emission from BL Lacertae with the MAGIC telescopes
- Beginning of a giant radio flare from Cygnus X-3
- SRGe J131014.2+444315 - a tidal disruption event at early phase
- Swift/BAT discovery of a new transient source Swift J1729.5-3223
- Swift/XRT detects a new accretion outburst from the Galactic center X-ray transient AX J1745.6-2901
- Swift XRT/UVOT follow-up of the recent optical activity of blazar BL Lacertae
- UV follow-up observations of five recently active novae in UV
- Swift detection of super-soft X-ray emission from V1674 Her
- Swift UVOT photometry and spectra from V1674 Her
- Brightening of MAXI J0903-531 Seen with Fermi GBM and Swift BAT, and a Candidate Orbital Period
- Swift detection of the NLS1 galaxy Mkn 335 in a high X-ray flux state
- Ultraviolet detections of three probable novae in M31
- Swift UVOT detection of the black hole transient 4U 1543-47
- Swift follow-up observations of the gamma-ray flaring blazar PKS 1454-354
- Multi-wavelength follow up of the very fast Nova Herculis 2021 (TCP J18573095+1653396)
- SGR Swift J1555.2-5402 : Swift-BAT detects two additional bursts
- New outburst from the bursting pulsar GRO J1744-28
- MAXI J1733-222 / 4U 1730-22: Updated Swift localization
- MAXI J1733-222: Swift identification as likely 4U 1730-22 in first outburst since 1972 discovery
- Update on the spin-down rate of Swift J1555.2-5402
- Swift J1555.2-5402: Swift XRT refined analysis of the new SGR
- A Disk Wind in the Black Hole Candidate MAXI J1803-298
- Swift XRT/UVOT follow-up of the renewed flaring activity of blazar PKS 0514-459
- Continuing >100 MeV Activity from the PSR B1259-63/LS 2883 System 85 Days Post-periastron Detected with the Fermi-LAT
- Swift Detection of MAXI J1803-298 including an optical counterpart
- Low level optical activity in MAXI J1820+070
- Swift J1357.2-0933 as observed with Swift during its 2021 outburst
- Swift/XRT observations of PGIR21fjn/AT2021kgk
- Long-Term X-ray Flaring Activity of the TeV-Detected Blazar H1426+428
- MAXI J0903-531: Swift localization and optical counterpart
- Swift Bulge Survey: Follow-up observations of the transient source Swift J174038.1-273712
- Swift Bulge Survey: Discovery of a new X-ray transient, Swift J174038.1-273712
- Swift upper limit on early X-ray emission of Nova Sagittarii 2021 No. 2 = V6595 Sgr = PNV J17581670-2914490
- Early NuSTAR and Swift X-ray detection of Nova Cassiopeiae 2021 = V1405 Cas = PNV J23244760+6111140
- Swift/XRT position of SRGA J181414.6-225604
- Observations of FRB 20201124A with Swift/XRT and UVOT
- Swift observations of FRB20201124A
- NICER and Swift observations of the new outburst of MAXI J1820+070
- Ultraviolet and X-ray observations of YY Her in outburst
- Start of the Swift monitoring of the Galactic bulge central part
- (S)wift/XRT localization of the newly discovered transient IGR J17533-2928
- MAXI J1848-015: Swift localization at the core of GLIMPSE-C01
- Optical monitoring of GX 339-4 suggests the source is approaching state transition
- Detection of enhanced X-ray flaring activity from Centaurus X-3 by Swift/BAT, MAXI/GSC and Fermi/GBM
- 4U 1755-338 is still in a soft/thermally dominated state after 10 months
- Renewed activity of X-ray binary pulsar A 0535+262 detected by Swift/BAT, MAXI/GSC, and Fermi/GBM
- Swift observation of the magnetar SGR 1935+2154 following the detection of several bursts
- A new ultraluminous X-ray source in NGC 4945
- Swift resumes X-ray monitoring observations of the Galactic center after Sun constraints
- Swift detects X-rays from XTE J1859+226; continued optical brightening.
- Increased X-ray activity for the black hole binary GX 339-4 detected with NuSTAR and Swift/XRT
- Swift follow-up observations of BL Lacertae during a new flaring activity
- Swift/MAXI/Fermi detection of strong X-ray activity from 2S 1417-624
- Swift/BAT detection of increasing activity from SS Cygni
- Swift J011511.0-725611: S-CUBED detection of a possible Be/WD Binary in the SMC
- Swift detection of a new SGR Swift J1851.2-6148 or a short GRB 210119A
- Cen X-4 returns to quiescent levels in X-ray, optical, and UV
- Swift/MAXI follow-up of recent outburst from X-ray pulsar 2S 1553-542
- Swift and NICER X-ray monitoring of the probable new outburst of Cen X-4
- XB-NEWS detects a probable new outburst from Cen X-4 after 41 years
- The Neil Gehrels Swift Observatory detection of hard X-ray outburst from Cygnus X-3