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"19533 results found.
- GRB 081228: detection by GROND
- GRB 081228: Enhanced Swift-XRT position
- GRB 081228: TAROT Calern observatory optical observations
- GRB 081228: Swift detection of a burst
- GRB 081226B: Swift XRT and UVOT upper limits
- GRB 081226: Swift-XRT refined analysis
- GRB 081226A: Swift UVOT Upper Limits
- GRB 081226A: Swift-BAT refined analysis
- GRB 081226: ROTSE-III Optical Limits
- GRB 081226: Swift detection of a possible short-hard burst
- GRB 081224: Swift-XRT observation
- Konus-Wind observation of GRB 081222
- GRB 081221: GROND observations
- GRB 081222:Optical afterglow observation
- GRB 081222: Fermi GBM observation
- GRB081222: Swift/UVOT further observations
- GRB 081221: Probable host galaxy in Keck imaging
- GRB 081222, Swift-BAT refined analysis
- GRB 081221, Swift-BAT refined analysis
- GRB081222 optical limit by "Pi of the Sky"
- GRB 081222: Swift XRT refined analysis
- GRB081221: Fermi GBM observation
- Swift/UVOT observations of GRB 081221
- IPN triangulation of bright GRB 081215A
- GRB 081221: Swift-XRT Refined Analysis
- GRB 081221: pseudo-redshift (pz=0.7) from the spectral parameters of the prompt emission
- GRB081222, optical observation
- GRB081222: Swift/UVOT detection of an optical afterglow
- GRB 081222: GROND Detection of the Optical/NIR Afterglow
- GRB 081222: Swift detection of a burst with a bright optical afterglow
- GRB 081221: Enhanced Swift-XRT position
- GRB 081221: Swift detection of a burst
- Modification of Swift/UVOT response to bright GRBs
- GRB 081211B: Further Swift-XRT analysis
- GRB 081211B - possibly a short burst with extended emission
- Possible GRB 081211B: Swift/UVOT Upper Limits
- GRB 081210: optical observations
- Possible GRB 081211B - Swift-XRT analysis
- GRB 081211B(?): Possible burst detection from Swift-BAT slew data
- GRB 081211: Swift-BAT refined analysis
- GRB 081211: Swift XRT refined analysis
- GRB 081211: Swift/UVOT detection of an optical afterglow
- GRB 081211: Enhanced Swift-XRT position
- GRB 081210: Swift/UVOT refined analysis
- GRB 081211: Swift detection of a burst
- GRB 081210: Swift-XRT refined analysis
- GRB 081210: Enhanced Swift-XRT position
- GRB 081210: Swift-BAT refined analysis
- GRB 081210: Swift detection of a burst with optical afterglow
- IPN triangulation of short hard GRB 081209
- Radio observation of GRB 081121 with ATCA
- GRB 081203B: Suzaku WAM observation of the prompt emission
- Radio observation of GRB 081029 with ATCA
- Radio observation of GRB 081008 with ATCA
- GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
- GRB 081128: optical observation in CrAO
- GRB 081128: Optical afterglow observations
- GRB 081204: GROND Observations
- GRB 081204: Swift/UVOT Upper Limits
- GRB 081204: Swift XRT afterglow confirmation
- GRB 081204: Swift XRT afterglow candidate
- Swift-XRT observations of GRB 081203B
- Konus-Wind observation of GRB 081203A
- Konus-Wind observation of GRB 081203B
- GRB081203A: Swift-XRT refined analysis
- GRB 081203B: optical observations
- Swift/UVOT detection of GRB081203B
- GRB 081203B: Swift-XRT candidate afterglow.
- GRB 081203A: optical observations
- Swift UVOT observations of GRB 081203A
- GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
- GRB081203A: Swift/UVOT grism redshift
- GRB 081203A: Burst detection from Swift-BAT slew data
- GRB 081203A: Swift-BAT refined analysis
- GRB 081203: Enhanced Swift-XRT position
- GRB081203: optical observation
- GRB 081203: Swift detection of a burst with a bright optical counterpart
- GRB 081128: optical observation
- Swift Trigger 335971: Swift/UVOT Observations
- GRB 081126: Fermi GBM detection
- Swift Trigger 335971 is probably not a real source
- Trigger 335971: Swift possible detection of a burst
- GRB081128: Swift/UVOT Upper Limits
- GRB 081128: Swift-XRT refined analysis
- GRB081128: optical observations
- GRB 081128: Swift-BAT refined analysis
- GRB 081128: Enhanced Swift-XRT position
- GRB 081128: Swift detection of a burst
- GRB 081126: Swift observations continuing
- GRB081126: Afterglow photometry from Crni Vrh
- GRB 081126: GRT Optical Observation
- GRB 081127: Swift/UVOT Upper Limits
- GRB 081127: Swift-XRT refined analysis
- GRB 081127: Enhanced Swift-XRT position
- GRB 081126: Confirmation of the Optical Afterglow
- GRB 081127: Swift-BAT refined analysis
- GRB 081126: Swift-XRT refined analysis
- GRB 081127: Swift detection of a burst
- GRB 081126: Swift/UVOT Observations
- GRB 081126: optical observations