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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').
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"

31744 results found.

  1. GRB 980519 Optical Observations
  2. GRB980519 optical observations
  3. GRB980515, BeppoSAX IAUC to be submitted
  4. GRB980519, BeppoSAX-WFC updated position
  5. GRB 980425 Radio Light Curve
  6. GRB 980425 Brightness Temperature
  7. BSAX Observations of GRB980425 field
  8. IPN web site of GRBs
  9. GRB980425 BATSE observations
  10. SAX J0840.7+2248 Optical Observations
  11. GRB 980425 optical observations
  12. GRB980425: optical obs.
  13. GRB980425: Radio Observations
  14. GRB 980425 optical observations
  15. GRB980326, optical observations
  16. GRB980326, optical observations
  17. GRB980329, Fading IR counterpart to radio source
  18. GRByymmdd, Announcement of automation
  19. GRB980326 IPN annulus
  20. GRB980329
  21. GRB980329 Keck K-band observations
  22. GRB980329 sub-millimeter observations
  23. GRB980329 IPN annulus
  24. GRB980329 optical observations
  25. GRB980329 near-IR observations
  26. GRB980329 optical observations
  27. GRB980326 optical observations
  28. GRB980326 optical observations
  29. GRB970508 SAO RAS optical observations
  30. GRB 971214: Redshift from Keck Observations
  31. Near-IR follow-up on GRB 971227
  32. GRB971214: Keck R & I-band Observations
  33. GRB 971227: Optical Observations
  34. Optical Observations of the GRB 971227 field
  35. GRB971227: Plaskett R-band observations
  36. GRB 971227: Optical clarifications
  37. GRB971227: LOTIS observations
  38. GRB971214: Optical Observations and Calibrations
  39. Optical Observations of GRB 971214 at Keck
  40. GRB 971024: Refined analysis by USNOFS Observations
  41. GRB 971024: USNO Observations
  42. GRB 970925: BATSE Localization
  43. IRAS 18119-1342 and the possible new SGR
  44. GRB 970228: Keck/LRIS Optical Observations

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