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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"

24779 results found.

  1. GRB 980703
  2. GRB980703 (optical R observations)
  3. BeppoSAX NFI observations of GRB 980703
  4. GRB 980703: ASM Position & Intensity
  5. GRB980703 optical followup
  6. Radio observations of SGRs
  7. SGR1900+14 field optical observations
  8. GRB 980613: Optical transient and its host galaxy
  9. SGR1627-41, RXTE/ASM observations
  10. GRB 980613: Detection of the probable host galaxy
  11. GRB 980613: BATSE Observations
  12. GRB 980613 Optical Observations
  13. GRB 980613 optical observations
  14. Discovery of a new SGR source, SGR1627-41
  15. GRB980613 Optical Observations
  16. GRB980613 observations from Palomar
  17. GRB980613 Near Infra-Red Observations
  18. GRB980613, BeppoSAX WFC positions
  19. GRB971214 Secondary Standards
  20. GRB980519 Secondary Standards
  21. SGR1900+14
  22. SGR1900+14
  23. BATSE on-board GRB trigger change
  24. GRB 980519 Optical Observations
  25. GRB 980519
  26. GRB980519 optical observations
  27. GRB 980519 Optical Observations
  28. GRB980519 BATSE Observations
  29. GRB980519 Optical Observations
  30. GRB 980519 Optical Observations
  31. GRB980519 optical observations
  32. GRB980515, BeppoSAX IAUC to be submitted
  33. BATSE on-board GRB trigger change
  34. GRB980519, BeppoSAX-WFC updated position
  35. BeppoSAX GRB ALERT: updated position of grb980515
  36. BSAX Observations of GRB980425 field
  37. IPN web site of GRBs
  38. GRB980425 BATSE observations
  39. SAX J0840.7+2248 Optical Observations
  40. GRB980425: optical obs.
  41. GRB980425: Radio Observations
  42. report on BSAX observations of GRB980425
  43. GRB 980329 ROSAT observation
  44. GRB980326 X-ray Observations
  45. GRB980326, optical observations
  46. GRB980326, optical observations
  47. GRB980329
  48. GRB980329 Keck K-band observations
  49. GRB980329 sub-millimeter observations
  50. GRB980329 IPN annulus
  51. GRB980329 optical observations
  52. GRB980329 near-IR observations
  53. GRB980326 optical observations
  54. GRB980329 optical observations
  55. GRB980329 VLA observations
  56. GRB980329 optical observations
  57. GRB980326 optical observations
  58. GRB980326 optical observations
  59. GRB980326 optical observations
  60. GRB970508 SAO RAS optical observations
  61. Optical Observations of GRB 970508
  62. Near-IR follow-up on GRB 971227
  63. GRB971214: Keck R & I-band Observations
  64. Optical Observations of the GRB 971227 field
  65. Optical Observations on GRB 971227
  66. GRB971227: Plaskett R-band observations
  67. GRB 971227: Optical clarifications
  68. GRB971227: Further CAHA R-band images
  69. GRB971227: LOTIS observations
  70. GRB971214: Optical Observations and Calibrations
  71. GRB 971214: EUVE Observations
  72. GRB 971214: KPNO Optical Observations
  73. GRB 971214: Optical Observations
  74. Radio Observations of GRB 971214 at the VLA
  75. GRB 971214: USNOFS Observations Summary
  76. GRB 971024: KPNO Optical Observations Summary
  77. GRB 971024: KPNO Optical Observations
  78. Possible new SGR from US Naval Observatory
  79. GRB 970828: Palomar Observations

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