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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"

21046 results found.

  1. GRB980519 optical observations
  2. GRB 980519
  3. GRB980519 optical observations
  4. GRB 980519 Optical Observations
  5. GRB980519 Optical Observations
  6. GRB 980519 Optical Observations
  7. GRB980515, BeppoSAX IAUC to be submitted
  8. BATSE on-board GRB trigger change
  9. GRB980519, BeppoSAX-WFC updated position
  10. GRB980515: SAX-WFC updated position
  11. GRB 980425 Radio Light Curve
  12. BSAX Observations of GRB980425 field
  13. IPN web site of GRBs
  14. SAX J0840.7+2248 Optical Observations
  15. GRB980425: optical obs.
  16. GRB980425: Radio Observations
  17. report on BSAX observations of GRB980425
  18. GRB 980329 ROSAT observation
  19. GRB980326 X-ray Observations
  20. GRB980326, optical observations
  21. GRB980326, optical observations
  22. GRB980329
  23. GRB980329 Keck K-band observations
  24. GRB980326 optical observations
  25. GRB980329 optical observations
  26. GRB980329 VLA observations
  27. GRB980329 optical observations
  28. GRB980326 optical observations
  29. GRB980326 optical observations
  30. GRB980326 optical observations
  31. Optical Observations of GRB 970508
  32. Near-IR follow-up on GRB 971227
  33. Optical Observations of the GRB 971227 field
  34. Optical Observations on GRB 971227
  35. GRB971227: Plaskett R-band observations
  36. GRB 971227: Optical clarifications
  37. GRB971227: Further CAHA R-band images
  38. GRB971227: LOTIS observations
  39. GRB971214: Optical Observations and Calibrations
  40. Sub-millimeter Observations of GRB 971214 at the JCMT
  41. GRB 971214: EUVE Observations
  42. GRB 971214: KPNO Optical Observations
  43. GRB 971214: Optical Observations
  44. Radio Observations of GRB 971214 at the VLA
  45. GRB 971024: KPNO Optical Observations
  46. GRB 970828: Palomar Observations

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