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"42471 results found.
- GRB 081215A: Fermi GBM detection
- IPN localization of short hard GRB 081216
- GRB 081211B - possibly a short burst with extended emission
- GRB 081118: Zadko observations
- Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
- GRB 0811215A: MASTER prompt optical observations
- GRB 081215A: Andromeda inside Fermi error box: MASTER observations
- GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
- Possible GRB 081211B: Swift/UVOT Upper Limits
- GRB 081213: Fermi GBM detection
- GRB 081210: optical observations
- Possible GRB 081211B - Swift-XRT analysis
- GRB 081207: Fermi GBM detection
- GRB 081209: Fermi GBM detection
- Fermi Gamma-ray Burst Monitor trigger 250533995 is not a GRB
- GRB 081007: Detection of a Supernova
- GRB 081211B(?): Possible burst detection from Swift-BAT slew data
- GRB 081210: Xinglong TNT R band Upper Limits
- GRB 081210, SMARTS optical/IR observations
- 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
- GRB081203B: optical observations
- GRB 081210: Enhanced Swift-XRT position
- GRB 081210: Swift-BAT refined analysis
- GRB 081210: Swift detection of a burst with optical afterglow
- Konus-Wind observation of GRB 081209
- IPN triangulation of short hard GRB 081209
- GRB 081203A: optical observations
- GRB 081206C: Fermi GBM detection
- Radio observation of GRB 081121 with ATCA
- Radio observation of GRB 081118 with ATCA
- GRB 081206B: Fermi GBM detection
- GRB 081206: Fermi GBM detection
- GRB 081128: afterglow observations
- GRB 081203B: Suzaku WAM observation of the prompt emission
- GRB 081203B: Additional Gemini imaging
- Radio observation of GRB 081109 with ATCA
- Radio observation of GRB 081104 with ATCA
- 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 081203B: Gemini observations
- GRB 081128: optical observation in CrAO
- GRB081203A: Optical observations at Ishigaki
- GRB 081128: Optical afterglow observations
- GRB 081204: GROND Observations
- GRB081203B: optical observations
- Radio detection of GRB 081203B with the VLA
- GRB 081204: Magellan observations
- GRB 081204B: Fermi GBM detection
- GRB 081204: Swift/UVOT Upper Limits
- GRB 081204: Swift XRT afterglow confirmation
- GRB081203A: MITSuME optical observation
- GRB 081203A: Optical observations of Xinglong TNT telescope
- GRB 081203A: Skynet/GORT Detections
- GRB 081204: Swift XRT afterglow candidate
- GRB081203A: optical observation
- GRB 081204 : a long GRB localized by INTEGRAL
- VLA Radio upper limit on GRB 081203A
- 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
- GRB 081130B: MASTER prompt optical observations
- GRB081203: optical observation
- GRB 081203: Swift detection of a burst with a bright optical counterpart
- GRB 081128: optical observation
- GRB 081130B: Fermi GBM detection
- GRB 081130: Fermi GBM detection
- Swift Trigger 335971: Swift/UVOT Observations
- GRB 081126: afterglow photometry
- GRB 081126: Fermi GBM detection
- Fermi Gamma-ray Burst Monitor trigger 249166723 reclassification
- VLA Radio upper limit on GRB 081126
- GRB 081129: Fermi GBM detection
- GRB 081130: MASTER VWF prompt optical observations Fermi GRB
- GRB 081128A: optical observations
- Swift Trigger 335971 is probably not a real source
- Trigger 335971: Swift possible detection of a burst
- GRB081128: Swift/UVOT Upper Limits
- SGR 1806-20: Fermi GBM detection.
- GRB 081122B: Fermi GBM Detection
- GRB 081128: Swift-XRT refined analysis
- GRB 081128: Liverpool Telescope afterglow confirmation
- GRB081128: optical observations