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"6667 results found.
- GRB 080916B: Swift-XRT refined analysis
- GRB 080916C: Fermi GBM Detection
- GRB 080916A: Swift XRT refined analysis
- GRB 080912 : Fermi GBM detection
- GRB 080915: Swift-XRT afterglow detection and analysis
- GRB 080913: Swift-XRT refined analysis
- GRB 080906B: Fermi GBM detection
- GRB 080905C: Fermi GBM detection
- GRB 080904: Fermi Gamma-ray Burst Monitor detection
- GRB 080905A: Fermi Gamma-ray Burst Monitor detection
- GRB 080906: Swift-XRT Refined Analysis
- GRB 080905A: Swift-XRT Refined Analysis
- GRB 080903: Swift-XRT Refined Analysis
- GRB 080830: Fermi Gamma-ray Burst Monitor detection
- SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
- SGR 0501+4516: Detection of possible optical counterpart
- SGR 0501+4516: WHT observations of the possible near-infrared counterpart
- GRB080825B: Swift/UVOT Upper Limits
- GRB 080828: Swift-XRT detection of a possible X-ray afterglow
- Enhanced Swift-XRT position of SGR 0501+4516
- SGR 0501+4516: Swift XRT measure of the spin period
- GRB080823: Fermi Gamma-ray Burst Monitor detection
- GRB 080824: Fermi Gamma Ray Burst Monitor detection
- GRB080825C: GLAST Burst Monitor detection
- GRB 080825B: Swift-XRT team analysis
- SGR 0501+4516: Astrotel-Caucasus optical observations
- GRB080818B: GLAST Burst Monitor detection
- GLAST Burst Monitor detection of GRB 080818
- GLAST Burst Monitor detection of GRB080816
- GLAST Burst Monitor detection of GRB 080810
- GRB080810: MITSuME optical observation
- GRB 080810: Liverpool Telescope observations
- GRB 080810: Swift-XRT Team refined analysis
- GRB 080810: KANATA optical-NIR observation, update
- GRB 080723B: XMM-Newton observation
- GRB 080805: Swift-XRT Refined Analysis
- GRB 080804: Swift-XRT Refined Analysis
- GRB 080727C: Swift XRT refined analysis
- GRB 080727B: Swift-XRT refined analysis
- GRB 080727A: Swift-XRT refined analysis
- GRB080723B: Swift/UVOT Upper Limits
- GRB 080723B - Swift-XRT refined analysis
- GRB 080723B - Swift-XRT position
- GRB 080723A: Swift-XRT refined analysis
- GRB 080721 : Lulin 2nd optical follow-ups
- GRB 080721: OA fading and redshift
- TNG/DOLORES redshift for GRB080721
- GRB 080721: Swift-XRT refined analysis
- GRB 080702B: Swift XRT confirmation of the afterglow
- GRB 080710: Swift-XRT refined analysis
- GRB 080707: possible break in the X-rays
- GRB 080707: Swift XRT refined analysis
- Refined analysis of Swift Trigger 316063, is IGR J08408-4503
- GRB 080703: Swift-XRT refined analysis
- GRB 080702B: Swift XRT and UVOT observations
- GRB 080702A: Swift-XRT Team refined analysis
- Swift Trigger 315630: TLS R-band observation
- TLS I-Band Observation of GRB 080701A
- GRB 080625:Swift-XRT detection of the afterglow
- Swift trigger 314975 is not a GRB
- GRB 080613A: Swift-XRT detection of the afterglow
- GRB 080613B - NOT optical and IR nondetections
- Swift observations of BAT Slew Survey event (Trigger=010)
- GRB 080603A: final Swift-XRT observations.
- GRB 080605: TLS 3rd Epoch - Source Confusion
- GRB 080607: Swift-XRT refined analysis
- GRB 080607 - PAIRITEL NIR detection
- GRB 080605: TLS RRM Analysis, Plateau/Rebrightening, Red OT
- GRB 080605, Swift-BAT refined analysis
- GRB 080605, Swift-BAT refined analysis
- GRB 080605: Swift-XRT refined analysis
- GRB 080603B: PAIRITEL infrared detection
- GRB 080603A: PAIRITEL infrared detection
- GRB 080603A: Swift-XRT detection of the afterglow
- GRB 080604: Swift detection of a burst with an optical afterglow
- SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
- GRB 080602: Swift-XRT refined analysis
- Swift analysis of BAT Slew Survey event (Trigger=009)
- Reactivation of SGR 1627-41
- GRB 080524: Swift XRT and UVOT analysis
- GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
- GRB 080517: Swift-XRT refined analysis
- GRB 080516: Swift-XRT Team refined analysis
- GRB 080514B: Swift-XRT analysis
- Swift detection of a possible galactic transient
- GRB 080506: NAYUTA Optical Observation
- GRB 080507: Swift XRT analysis confirms the X-ray afterglow
- GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
- GRB 080507: Swift-XRT position of a possible afterglow
- GRB 080506: TLS 2nd Epoch - possible light curve break
- GRB 080506: Swift XRT refined analysis
- GRB 080506: Optical observation with KANATA/TRISPEC
- GRB080503 XRT refined analysis
- GRB 080411: Continued Swift Monitoring
- GRB 080430: Swift-XRT refined analysis
- GRB 080426: Swift-XRT refined analysis
- GRB 080426, Swift-BAT refined analysis
- Possible GRB 080315: XRT non-detection of afterglow
- GRB080319A: MAGIC telescope GeV observation
- GRB 080420?: Swift detection of a possible short burst