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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"

11100 results found.

  1. GRB 090528B: Suzaku WAM observation of the prompt emission
  2. GRB090529B: ROVOR Upper Limits
  3. GRB 090529C: Fermi GBM detection
  4. GRB 090529B: Fermi GBM detection
  5. GRB 090530B: Fermi GBM detection
  6. GRB 090528B: MASTER-II Kourovka optical limit
  7. GRB 090528B: Fermi GBM detection
  8. GRB 090528: Fermi GBM detection
  9. GRB 090520D: Fermi GBM detection
  10. GRB 090520C: Fermi GBM detection
  11. GRB 090520B: Fermi GBM detection
  12. GRB090518B optical limit by "Pi of the Sky"
  13. GRB 090522 : Fermi GBM detection
  14. GRB 090524: Fermi GBM detection
  15. GRB 090513B: Fermi GBM detection
  16. GRB 090518: Fermi GBM detection
  17. GRB 090516C: Fermi GBM detection
  18. GRB 090423: Fermi GBM T90 follow-up analysis results
  19. GRB 090516: Fermi GBM observation
  20. GRB 090516B: Fermi GBM detection
  21. GRB 090519B: Fermi GBM detection
  22. GRB 090511: Fermi GBM Detection
  23. GRB 090514: Fermi GBM detection
  24. GRB 090518B: Fermi GBM detection
  25. GRB090513: Fermi GBM detection
  26. GRB 090509: Fermi GBM observation
  27. GRB 090510: Suzaku WAM observation of the prompt emission
  28. GRB 090510, Radio limits
  29. GRB090510: VLT/FORS2 spectroscopic redshift
  30. GRB 090510: GROND observations
  31. GRB 090510: Fermi-LAT follow-up analysis
  32. Fermi Gamma-ray Burst Monitor trigger 263649437 is not a GRB
  33. GRB 090510B: Fermi GBM detection
  34. GRB 090502: Fermi GBM detection
  35. Konus-Wind observation of GRB 090510
  36. GRB 090510: NOT afterglow confirmation
  37. GRB 090510: Fermi GBM detection
  38. Fermi LAT detection of GRB 090510
  39. GRB 090323: optical observations
  40. GRB 090428B: Suzaku WAM observation of the prompt emission
  41. GRB 090429D: Fermi GBM detection
  42. GRB 090429C: Fermi GBM detection
  43. GRB 090427C: Fermi GBM detection
  44. GRB 090427B: Fermi GBM detection
  45. GRB 090426C: Fermi GBM detection
  46. GRB 090426B: Fermi GBM detection/observation
  47. GRB 090428B: Fermi GBM detection
  48. GRB 090428: Fermi GBM detection
  49. GRB 090425: Fermi GBM detection
  50. GRB 090424: MASTER-Net prompt optical limit
  51. GRB 090423: Fermi GBM observation (correction of isotropic equivalent energy)
  52. GRB 090423: Swift/BAT spectral lag results
  53. GRB 090423: energetic, luminosity and jet break
  54. GRB 090424: Fermi GBM Observation
  55. GRB 090423: Fermi GBM observation
  56. GRB 090422: Fermi GBM observation
  57. GRB 090418C: Fermi GBM Detection
  58. GRB 090411B: Suzaku WAM observation of the prompt emission
  59. GRB 090411A: Suzaku WAM observation of the prompt emission
  60. GRB 090412: Fermi GBM detection
  61. GRB 090411B: Fermi GBM detection
  62. GRB 090411A: Fermi GBM detection
  63. Fermi GBM trigger 261106787 is not a GRB
  64. GRB 090409: Fermi GBM detection
  65. Fermi GBM Detection of a weak source
  66. GRB 090405: Fermi GBM Detection
  67. GRB 090403: Fermi GBM detection
  68. Fermi Gamma-ray Burst Monitor trigger 260428446 is not a GRB
  69. GRB 090328: Fermi-LAT refined analysis
  70. GRB 090331: Fermi GBM detection
  71. GRB 090328B: MASTER-Irkutsk prompt optical short burst observations
  72. GRB 090323: Further TLS detections - a break?
  73. GRB 090328: Radio afterglow detection
  74. GRB 090326: Fermi GBM detection
  75. GRB 090328: BOOTES-3 optical observations
  76. GRB 090328: Fermi GBM Spectral Analysis
  77. GRB 090328B: Fermi GBM Detection
  78. GRB 090330: Fermi GBM detection
  79. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  80. GRB 090328: Gemini South Redshift
  81. GRB 090328: Swift XRT refined analysis
  82. Konus-Wind observation of GRB 090328
  83. GRB 090328: IPN Triangulation
  84. GRB 090328: Swift UVOT observations
  85. Fermi LAT and GBM detections of GRB090328
  86. GRB 090323: Radio afterglow detection
  87. GRB 090323: TLS detection at 5 days, no break
  88. GRB 090327: Fermi GBM detection
  89. GRB 090323: Faulkes Telescope South Observations
  90. GRB 090320B: MASTER-Net prompt optical observations
  91. GRB 090323: Fermi GBM Spectral Analysis
  92. GRB 090323 TLS detection - still bright
  93. GRB 090323: UVOT Detection of Afterglow
  94. GRB 090323: Swift-XRT refined analysis
  95. Konus-Wind observation of GRB 090323
  96. GRB 090323: GROND Detection of the Afterglow and Photo-z
  97. SGR J1550-5418: two Fermi GBM triggers on March 22
  98. GRB 090323: Possible XRT Counterpart
  99. IPN triangulation of GRB090323
  100. GRB 090320C: Fermi GBM Detection

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