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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"

20352 results found.

  1. Discovery of a new SGR source, SGR1627-41
  2. GRB980613 Optical Observations
  3. GRB980613 observations from Palomar
  4. GRB980613 Near Infra-Red Observations
  5. GRB980613, BeppoSAX WFC positions
  6. GRB971214 Secondary Standards
  7. GRB980519 Secondary Standards
  8. GRB 980519 Optical Observations
  9. GRB 980519
  10. GRB980519 optical observations
  11. GRB 980519 Optical Observations
  12. GRB980519 BATSE Observations
  13. GRB970519, optical follow-up at Schmidt Calern
  14. GRB980519 Optical Observations
  15. GRB 980519 Optical Observations
  16. GRB980515, BeppoSAX IAUC to be submitted
  17. GRB980519, BeppoSAX-WFC position
  18. BeppoSAX GRB ALERT: updated position of grb980515
  19. GRB 980425 Brightness Temperature
  20. BSAX Observations of GRB980425 field
  21. SAX J0840.7+2248 Optical Observations
  22. GRB980425: optical obs.
  23. GRB980425: Radio Observations
  24. report on BSAX observations of GRB980425
  25. GRB980326 X-ray Observations
  26. GRB980326, optical observations
  27. GRB980326, optical observations
  28. GRB980329 Keck K-band observations
  29. GRB980329 sub-millimeter observations
  30. GRB980326 optical observations
  31. GRB980329 optical observations
  32. GRB980329 VLA observations
  33. GRB980329 optical observations
  34. GRB980326 optical observations
  35. Optical Observations of GRB 970508
  36. GRB 971214: Redshift from Keck Observations
  37. Near-IR follow-up on GRB 971227
  38. Optical Observations of the GRB 971227 field
  39. Optical Observations on GRB 971227
  40. GRB971227: Plaskett R-band observations
  41. GRB 971227: Optical clarifications
  42. GRB971227: Further CAHA R-band images
  43. GRB971227: LOTIS observations
  44. GRB971214: Optical Observations and Calibrations
  45. Sub-millimeter Observations of GRB 971214 at the JCMT
  46. GRB 971214: KPNO Optical Observations
  47. Optical Observations of GRB 971214 at Keck
  48. GRB 971214: Optical Observations
  49. Radio Observations of GRB 971214 at the VLA
  50. GRB 971024: KPNO Optical Observations
  51. RXTE Observations of SGR 1814-13
  52. GRB 970828: Palomar Observations

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