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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

12376 results found.

  1. GRB 090423: Fermi GBM T90 follow-up analysis results
  2. GRB 090516: Fermi GBM observation
  3. GRB 090516B: Fermi GBM detection
  4. GRB 090519B: Fermi GBM detection
  5. GRB 090511: Fermi GBM Detection
  6. GRB 090514: Fermi GBM detection
  7. GRB 090518B: Fermi GBM detection
  8. GRB090513: Fermi GBM detection
  9. GRB 090509: Fermi GBM observation
  10. GRB 090510: Suzaku WAM observation of the prompt emission
  11. GRB 090510, Radio limits
  12. GRB090510: VLT/FORS2 spectroscopic redshift
  13. GRB 090510: GROND observations
  14. GRB 090510: Fermi-LAT follow-up analysis
  15. Fermi Gamma-ray Burst Monitor trigger 263649437 is not a GRB
  16. GRB 090510B: Fermi GBM detection
  17. GRB 090502: Fermi GBM detection
  18. Konus-Wind observation of GRB 090510
  19. GRB 090510: NOT afterglow confirmation
  20. GRB 090510: Fermi GBM detection
  21. Fermi LAT detection of GRB 090510
  22. GRB 090323: optical observations
  23. GRB 090428B: Suzaku WAM observation of the prompt emission
  24. GRB 090429D: Fermi GBM detection
  25. GRB 090429C: Fermi GBM detection
  26. GRB 090427C: Fermi GBM detection
  27. GRB 090427B: Fermi GBM detection
  28. GRB 090426C: Fermi GBM detection
  29. GRB 090426B: Fermi GBM detection/observation
  30. GRB 090428B: Fermi GBM detection
  31. GRB 090428: Fermi GBM detection
  32. GRB 090425: Fermi GBM detection
  33. GRB 090424: MASTER-Net prompt optical limit
  34. GRB 090423: Fermi GBM observation (correction of isotropic equivalent energy)
  35. GRB 090423: Swift/BAT spectral lag results
  36. GRB 090423: energetic, luminosity and jet break
  37. GRB 090424: Fermi GBM Observation
  38. GRB 090423: Fermi GBM observation
  39. GRB 090422: Fermi GBM observation
  40. GRB 090418C: Fermi GBM Detection
  41. GRB 090411B: Suzaku WAM observation of the prompt emission
  42. GRB 090411A: Suzaku WAM observation of the prompt emission
  43. GRB 090412: Fermi GBM detection
  44. GRB 090411B: Fermi GBM detection
  45. GRB 090411A: Fermi GBM detection
  46. Fermi GBM trigger 261106787 is not a GRB
  47. GRB 090409: Fermi GBM detection
  48. Fermi GBM Detection of a weak source
  49. GRB 090405: Fermi GBM Detection
  50. GRB 090403: Fermi GBM detection
  51. Fermi Gamma-ray Burst Monitor trigger 260428446 is not a GRB
  52. GRB 090328: Fermi-LAT refined analysis
  53. GRB 090331: Fermi GBM detection
  54. GRB 090328B: MASTER-Irkutsk prompt optical short burst observations
  55. GRB 090323: Further TLS detections - a break?
  56. GRB 090328: Radio afterglow detection
  57. GRB 090326: Fermi GBM detection
  58. GRB 090328: BOOTES-3 optical observations
  59. GRB 090328: Fermi GBM Spectral Analysis
  60. GRB 090328B: Fermi GBM Detection
  61. GRB 090330: Fermi GBM detection
  62. GRB 090328: GROND Detection of the Optical/NIR Afterglow
  63. GRB 090328: Gemini South Redshift
  64. GRB 090328: Swift XRT refined analysis
  65. Konus-Wind observation of GRB 090328
  66. GRB 090328: IPN Triangulation
  67. GRB 090328: Swift UVOT observations
  68. Fermi LAT and GBM detections of GRB090328
  69. GRB 090323: Radio afterglow detection
  70. GRB 090323: TLS detection at 5 days, no break
  71. GRB 090327: Fermi GBM detection
  72. GRB 090323: Faulkes Telescope South Observations
  73. GRB 090320B: MASTER-Net prompt optical observations
  74. GRB 090323: Fermi GBM Spectral Analysis
  75. GRB 090323 TLS detection - still bright
  76. GRB 090323: UVOT Detection of Afterglow
  77. GRB 090323: Swift-XRT refined analysis
  78. Konus-Wind observation of GRB 090323
  79. GRB 090323: GROND Detection of the Afterglow and Photo-z
  80. SGR J1550-5418: two Fermi GBM triggers on March 22
  81. GRB 090323: Possible XRT Counterpart
  82. IPN triangulation of GRB090323
  83. GRB 090320C: Fermi GBM Detection
  84. Fermi GBM and LAT detections of GRB 090323
  85. GRB 090320B: Fermi GBM detection.
  86. GRB 090319: Fermi GBM detection
  87. GRB 090320A: Fermi GBM detection
  88. GRB090305B: MASTER-net prompt optical short burst observations
  89. GRB090310: Fermi GBM detection
  90. GRB090305B: Fermi GBM detection
  91. GRB 090309B: Fermi GBM detection
  92. GRB 090308B: Fermi GBM detection
  93. GRB 090307B: Fermi GBM detection
  94. GRB 090306C: Fermi GBM detection
  95. Fermi GBM trigger 090305784 is not a GRB
  96. GRB 090303: Fermi GBM detection
  97. GRB 090304: Fermi GBM detection
  98. Konus-RF catches first GRB and SGR bursts
  99. GRB 090228B: Fermi GBM detection
  100. Konus-Wind observation of bright short GRB 090227B

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