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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"

20363 results found.

  1. BeppoSAX NFI observations of GRB 980703
  2. GRB 980703: ASM Position & Intensity
  3. GRB980703 optical followup
  4. Radio observations of SGRs
  5. SGR1900+14 field optical observations
  6. GRB 980613: Optical transient and its host galaxy
  7. SGR1627-41, RXTE/ASM observations
  8. GRB 980613: Detection of the probable host galaxy
  9. GRB 980613 Optical Observations
  10. GRB 980613 optical observations
  11. Discovery of a new SGR source, SGR1627-41
  12. GRB980613 Optical Observations
  13. GRB980613 observations from Palomar
  14. GRB 980613 optical/IR obs.
  15. GRB980613 Near Infra-Red Observations
  16. GRB980613, BeppoSAX WFC positions
  17. GRB971214 Secondary Standards
  18. GRB980519 Secondary Standards
  19. SGR1900+14
  20. SGR1900+14
  21. BATSE on-board GRB trigger change
  22. GRB 980519 Optical Observations
  23. GRB 980519
  24. GRB980519 optical observations
  25. GRB 980519 Optical Observations
  26. GRB970519, optical follow-up at Schmidt Calern
  27. GRB980519 Optical Observations
  28. GRB 980519 Optical Observations
  29. GRB980519 optical observations
  30. GRB980515, BeppoSAX IAUC to be submitted
  31. BATSE on-board GRB trigger change
  32. GRB980515: SAX-WFC updated position
  33. BSAX Observations of GRB980425 field
  34. IPN web site of GRBs
  35. SAX J0840.7+2248 Optical Observations
  36. GRB980425: optical obs.
  37. GRB980425: Radio Observations
  38. report on BSAX observations of GRB980425
  39. GRB980326 X-ray Observations
  40. GRB980326, optical observations
  41. GRB980326, optical observations
  42. GRB980329 Keck K-band observations
  43. GRB980329 sub-millimeter observations
  44. GRB980326 optical observations
  45. GRB980329 optical observations
  46. GRB980329 VLA observations
  47. GRB980329 optical observations
  48. GRB980326 optical observations
  49. GRB970508 SAO RAS optical observations
  50. Optical Observations of GRB 970508
  51. Near-IR follow-up on GRB 971227
  52. Optical Observations of the GRB 971227 field
  53. Optical Observations on GRB 971227
  54. GRB971227: Plaskett R-band observations
  55. GRB 971227: Optical clarifications
  56. GRB971227: Further CAHA R-band images
  57. GRB971227: LOTIS observations
  58. GRB971214: Optical Observations and Calibrations
  59. GRB 971214: Optical Observations
  60. Radio Observations of GRB 971214 at the VLA
  61. GRB 971024: KPNO Optical Observations
  62. GRB 970828: Palomar Observations
  63. GRB 970228: Keck/LRIS Optical Observations

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