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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"

11837 results found.

  1. GRB 100615A: Fermi GBM detection
  2. GRB 100528A: Faulkes Telescope North Detection
  3. GRB 100528A: GROND detection in all bands
  4. GRB 100528A: Fermi GBM observation
  5. GRB100522A: Suzaku WAM observation of the prompt emission
  6. GRB 100522A: GROND observations, upper limits
  7. GRB 100522A: Fermi GBM observation
  8. Update to the configuration of the Fermi-LAT onboard GRB search
  9. Fermi/GBM trigger 295791986 - unreliable location
  10. GRB 100517A: MASTER-Net wide field camera prompt optical observations
  11. GRB 100510A: Fermi GBM detection/observation
  12. GRB 100511A: Fermi GBM detection/observation
  13. GRB 100510A: MAXI/GSC detection
  14. GRB100503A: Suzaku WAM observation of the prompt emission
  15. Fermi Gamma-ray Burst Monitor trigger 294712621 is not a GRB
  16. GRB 100504A: Fermi GBM observation
  17. GRB 100503A: Fermi GBM detection
  18. GRB 100427A: Fermi GBM detection
  19. GRB 100414A : EVLA Radio Detection
  20. GRB 100414A : WSRT Radio Detection
  21. GRB 100423B: Fermi GBM detection
  22. GRB 100414A: Radio Afterglow Detection with the Expanded VLA
  23. GRB 100414A: Confirmation of the X-ray afterglow
  24. GRB100414A: SAO RAS optical observations
  25. GRB 100414A: Suzaku WAM observation of the prompt emission
  26. GRB 100414A: Swift/UVOT Observations
  27. GRB 100414A: GROND Detection of the Optical Afterglow
  28. GRB 100414A: Gemini-N candidate and redshift
  29. GRB 100414A: Palomar Transient Factory Observations
  30. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  31. GRB 100414A: IPN Localization
  32. Konus-Wind observation of GRB 100414B
  33. GRB 100414A: Fermi GBM detection
  34. GRB100414A: Fermi LAT detection
  35. GRB 100401A: Swift/UVOT Upper Limit
  36. Swift/BAT trigger 417974 (GRB100401A): Swift/XRT observations
  37. GRB 100401A: Fermi GBM detection
  38. IPN triangulation of GRB100324B
  39. Konus-Wind observation of GRB 100322A
  40. Fermi GBM detection of four Solar Flares
  41. GRB 100322A: Suzaku WAM observation of the prompt emission
  42. Fermi/GBM and Swift/BAT detection of a burst from SGR 1806-20
  43. GRB 100325A: Fermi LAT detection
  44. GRB 100325A: Fermi GBM detection
  45. GRB 100322A: Fermi GBM detection
  46. GRB 100224B: Fermi GBM detection
  47. GRB 100206A: optical observations in Terskol
  48. GRB 100225A: Fermi LAT detection
  49. GRB 100225A: Fermi GBM detection
  50. GRB 100223A: Fermi GBM detection
  51. GRB 100218A : Fermi GBM detection
  52. GRB 100216A Short, hard GRB detected in ground analysis of Swift-BAT data
  53. GRB 100212A: Fermi GBM detection
  54. GRB 100205B: Fermi GBM detection
  55. GRB 100131A: MASTER-Net optical alert observations
  56. GRB 100206A: Fermi GBM observation
  57. GRB 100130B: Fermi GBM detection
  58. GRB 100113A: Fermi GBM detection
  59. GRB 100131A: Suzaku WAM observation of the prompt emission
  60. GRB 100131A: Fermi GBM detection
  61. GRB 100122A: Fermi GBM detection
  62. GRB 100122A: MASTER-Net optical observations
  63. GRB 100116A: Suzaku WAM observation of the prompt emission
  64. Konus-Wind observation of GRB 100116A
  65. GRB 100117A: Fermi GBM detection
  66. GRB 100116A: Fermi LAT detection
  67. GRB 100116A: Fermi GBM detection
  68. GRB 100111A: Fermi GBM observation
  69. GRB 091221: Fermi GBM Observation
  70. GRB 091208B: optical observations
  71. GRB 091208B: Fermi GBM observation
  72. GRB 091123: Suzaku WAM observation of the prompt emission
  73. GRB 091126A: Suzaku WAM observation of the prompt emission
  74. Konus-Wind observation of very long GRB 091123
  75. GRB 091123: Fermi GBM detection of a very long burst
  76. GRB 091126B: Fermi GBM detection
  77. GRB 091127: Suzaku WAM observation of the prompt emission
  78. GRB 091126: Fermi GBM detection
  79. GRB 091128: Fermi GBM detection
  80. GRB 091127: Fermi GBM detection
  81. IPN Triangulation of GRB091120
  82. Konus-Wind observation of GRB 091120
  83. GRB 091120: MAXI GSC detection
  84. GRB 091120: Fermi GBM observation
  85. GRB 091112: Suzaku WAM observation of the prompt emission
  86. GRB 091102A: Suzaku WAM observation of the prompt emission
  87. Konus-Wind and Konus-RF observations of GRB 091031
  88. GRB 091112: Fermi GBM observation
  89. GRB 091031: Fermi LAT detection of a faint burst
  90. GRB 091030: Fermi GBM detection
  91. Fermi LAT Upper Limits on GRB 091010
  92. GRB 091102A: Fermi GBM observation
  93. GRB 091031: Fermi GBM detection
  94. GRB 091024: Fermi LAT upper limits
  95. Fermi Gamma-ray Burst Monitor trigger 091028818 is not a GRB
  96. GRB 091020: Fermi GBM observation
  97. GRB 091024: Burst was outside the Swift-BAT FOV after T0(BAT)+460sec
  98. GRB 091024: Fermi GBM Observations
  99. GRB 090926A: Late-time Gemini South Observations and Possible Jet Break
  100. GRB 091003: Gemini-N redshift of possible host galaxy

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