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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"

26265 results found.

  1. Radio observations of SGRs
  2. SGR1900+14 field optical observations
  3. GRB980613, optical observations
  4. GRB 980613: Optical transient and its host galaxy
  5. SGR1627-41, RXTE/ASM observations
  6. GRB 980613: Detection of the probable host galaxy
  7. Reduced error box of SGR 1627-41
  8. GRB 980613: BATSE Observations
  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. GRB971214 Secondary Standards
  17. GRB980519 Secondary Standards
  18. BATSE on-board GRB trigger change
  19. GRB 980519 Optical Observations
  20. GRB 980519
  21. GRB980519 optical observations
  22. GRB 980519 Optical Observations
  23. GRB980519 BATSE Observations
  24. GRB980519 Optical Observations
  25. GRB980519 Optical Observations
  26. GRB 980519 Optical Observations
  27. GRB980515, BeppoSAX IAUC to be submitted
  28. BSAX Observations of GRB980425 field
  29. IPN web site of GRBs
  30. GRB980425 BATSE observations
  31. SAX J0840.7+2248 Optical Observations
  32. GRB980425: optical obs.
  33. GRB980425: Radio Observations
  34. report on BSAX observations of GRB980425
  35. GRB 980329 ROSAT observation
  36. GRB980326 X-ray Observations
  37. GRB980326, optical observations
  38. GRB980326, optical observations
  39. GRB980329, Fading IR counterpart to radio source
  40. GRB980329 Keck K-band observations
  41. GRB980329 sub-millimeter observations
  42. GRB980329 optical observations
  43. GRB980329 near-IR observations
  44. GRB980329 near-IR observations
  45. GRB980326 optical observations
  46. GRB980329 optical observations
  47. GRB980329 VLA observations
  48. GRB980329 optical observations
  49. GRB980329 optical observations
  50. GRB980326 optical observations
  51. GRB980326 optical observations
  52. Optical Observations of GRB 970508
  53. Near-IR follow-up on GRB 971227
  54. Optical Observations of the GRB 971227 field
  55. Optical Observations on GRB 971227
  56. GRB971227: Plaskett R-band observations
  57. GRB 971227: Optical clarifications
  58. GRB971227: Further CAHA R-band images
  59. GRB971227: LOTIS observations
  60. GRB971214: Optical Observations and Calibrations
  61. GRB 971214: Optical Observations
  62. Radio Observations of GRB 971214 at the VLA
  63. GRB 971024: Refined analysis by USNOFS Observations
  64. GRB 971024: KPNO Optical Observations
  65. GRB 970828: Palomar Observations

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