GCN Circulars
GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.
Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search
To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"21459 results found.
- GRB 080602: NOT R-band upper limit
- GRB 080602: Enhanced Swift-XRT position
- GRB 080602: Swift detection of a burst
- Swift analysis of BAT Slew Survey event (Trigger=009)
- Konus-Wind observation of reactivation of SGR 1627-41
- Reactivation of SGR 1627-41
- GRB 080524: Swift XRT and UVOT analysis
- GRB 080524: Swift-BAT detection of a burst in ground analysis
- GRB 080523: Swift-XRT refined analysis
- GRB 080523, Swift-BAT refined analysis
- GRB 080523: VLT optical observations
- Swift/UVOT observations of GRB 080523
- GRB 080523: Enhanced Swift-XRT position
- GRB 080523: Swift detection of a burst
- GRB 080515: KPNO 4m NIR afterglow detection
- GRB080521(?): detection of possible burst from BAT slew data and XRT ToO
- GRB 80516: Swift/UVOT Observations
- GRB 080515: Swift-XRT position and analysis
- GRB 080520, Swift-BAT refined analysis
- GRB 080514B: pseudo-z= 1.8 from prompt emission spectrum
- GRB 080514B: UVOT Observations
- GRB080520: Swift/UVOT observations
- GRB 080520, GROND observations
- GRB 080520: Enhanced Swift-XRT position
- GRB 080520: Swift XRT Refined Analysis
- GRB 080520: Swift detection of a burst with optical afterglow
- GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
- GRB 080517, Swift-BAT refined analysis
- GRB 080517: Swift-XRT refined analysis
- GRB 080517: Enhanced Swift-XRT position
- GRB080517: Liverpool Telescope Optical Observations
- GRB 080517: Swift detection of a burst
- GRB 080516, GROND observations
- GRB 080516, SMARTS optical/IR observations
- GRB 080516: Swift-XRT Team refined analysis
- GRB 080516, Swift-BAT refined analysis
- GRB 080516: Enhanced Swift-XRT position
- GRB 080516: Swift detection of a burst
- Errartum: VLA upper limit on GRB 080507
- VLA upper limit on GRB 080705
- GRB 080514B : redshift estimation
- IPN triangulation of bright GRB 080513
- Swift-BAT refined analysis for Trigger 311603: Galactic source
- GRB 080515, Swift-BAT refined analysis
- GRB 080514B: Swift-XRT analysis
- GRB 080515: Swift detection of a burst
- GRB 080514B: possible AGILE detection at E>50 MeV
- Swift detection of a possible galactic transient
- GRB080514: REM NIR & Optical Observations
- GRB 080507: Suzaku WAM observation of the prompt emission
- GRB 080507: Swift XRT analysis confirms the X-ray afterglow
- GRB 080507: Keck photometry
- GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
- GRB080507: Swift/UVOT followup observations
- GRB 080507: Swift-XRT position of a possible afterglow
- GRB 080506: VLA radio upper limit
- GRB 080506: TLS 2nd Epoch - possible light curve break
- GRB 080506: Swift XRT refined analysis
- GRB080506: Swift/UVOT observations
- GRB 080506, Swift-BAT refined analysis
- GRB080503, RIMOTS optical upper limit
- GRB 080506: TLS afterglow detection in VRIZ
- GRB 080506: Enhanced Swift-XRT position
- GRB 080506: Swift detection of a burst with optical afterglow
- GRB 080503: Late-time Optical rebrightening (possible mini-SN)
- GRB 080503, Swift-BAT lag and time-resolved spectral analysis
- GRB080503: Swift/UVOT Upper Limits
- GRB080503 XRT refined analysis
- GRB 080503, Swift-BAT refined analysis
- GRB 080430
- GRB 080503: Enhanced Swift-XRT position
- GRB 080503: MITSuME Akeno optical upper limits
- GRB 080503: New candidate afterglow/host in Gemini imaging
- GRB 080503: Optical afterglow candidate and LRIS spectroscopy of the short burst
- GRB 080503: Swift detection of a short burst
- GRB 080411: Continued Swift Monitoring
- GRB 080430: Optical observations
- GRB080430: Swift/UVOT observations
- GRB 080430 optical observations
- GRB 080430, Swift-BAT refined analysis
- GRB 080430: Swift-XRT refined analysis
- GRB 080430: Enhanced Swift-XRT position
- GRB 080430 - SDSS Pre-Burst Observations
- GRB 080430: Swift detection of a burst with optical afterglow
- GRB 080430: TAROT Calern observatory optical observations
- GRB080426: Observations from CAHA
- GRB 080426: Swift-XRT refined analysis
- GRB080426: Swift/UVOT upper limits
- GRB 080426: Enhanced Swift-XRT position
- GRB 080426, Swift-BAT refined analysis
- GRB 080426: Swift detection of a possibly short burst
- Possible GRB 080315: XRT non-detection of afterglow
- GRB 080320 : Faulkes Telescope North Observations
- GRB 080319A : Liverpool and Faulkes Telescopes Observations
- Swift-BAT trigger 309665 is not a GRB
- GRB 080420A: ROTSE-III Optical Limits on a possible short burst
- GRB 080420?: Swift detection of a possible short burst
- GRB 080413A: Suzaku/WAM and Swift/BAT joint spectral analysis
- Swift XRT and UVOT observations of GRB080414
- GRB 080319B: Jet Break, Energetics, Supernova