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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 090902B: Swift/UVOT refined analysis
  2. GRB090902B: Swift XRT refined analysis
  3. GRB 090902B: Faulkes Telescope North observations
  4. GRB 090902B: GROND NIR Afterglow Observations
  5. GRB 090902B: Gemini-N absorption redshift
  6. GRB 090902B: Fermi LAT and GBM refined analysis.
  7. GRB 090902B: Optical afterglow candidate
  8. GRB090902B: Swift/UVOT observations
  9. GRB 090902B: Swift/XRT Afterglow Candidate
  10. GRB 090902B: Fermi LAT detection
  11. GRB 090902B: Fermi GBM detection of a bright burst
  12. GRB 090902: Fermi GBM detection
  13. GRB 090831A: IPN Triangulation
  14. GRB 090829B: Fermi GBM Detection
  15. GRB 090831: MAXI GSC detection
  16. GRB 090831: Fermi GBM detection
  17. GRB090829: Fermi GBM Detection
  18. GRB 090826: Fermi GBM detection
  19. GRB 090828: Fermi GBM detection
  20. Fermi Gamma-ray Burst Monitor trigger 273123112 is not a GRB
  21. GRB 090817 - TLS Observations
  22. GRB 090820: detection of a strong burst by RT-2 on board CORONAS PHOTON
  23. GRB 090820B: Fermi GBM detection
  24. GRB 090820: MASTER-Net optical polarization observations
  25. GRB 090820: Fermi GBM Detection of a bright burst.
  26. GRB 090817: Fermi GBM observation
  27. GRB 090813: Suzaku WAM observation of the prompt emission
  28. GRB 090815B: Fermi GBM detection
  29. GRB 090815: Fermi GBM detection
  30. Fermi Gamma-ray Burst Monitor trigger 271934815 is not a GRB
  31. GRB 090814C: Fermi GBM detection
  32. GRB 090813: Fermi GBM observation
  33. Fermi Gamma-ray Burst Monitor trigger 271446248 is not a GRB
  34. Fermi Gamma-ray Burst Monitor trigger 271833016 is not a GRB
  35. GRB 090807B: Fermi GBM detection
  36. GRB 090621B: MAGIC telescope GeV observation
  37. GRB 090621A: MAGIC telescope GeV observation
  38. GRB 090809B: Fermi GBM detection
  39. Fermi Gamma-ray Burst Monitor trigger 271275771 is not a GRB
  40. GRB 090802B: Fermi GBM detection
  41. GRB 090802: Fermi GBM detection
  42. GRB 090717A: Suzaku WAM observation of the prompt emission
  43. GRB 090711: Fermi GBM detection
  44. Konus-Wind and Konus-RF observations of GRB 090719
  45. Konus-RF and Konus-Wind observations of GRB 090718B
  46. Fermi Gamma-ray Burst Monitor triggers 269935914 through 270021937 are not GRBs
  47. Konus-Wind observations of bright hard GRB 090720B
  48. IPN Triangulation of bright GRB 090720B
  49. GRB 090720: Gemini-North Imaging and Optical Afterglow
  50. GRB 090720B: Fermi GBM detection
  51. Swift XRT and UVOT refned analysis of GRB 090720
  52. GRB 090720 Source found in ground processing of Swift-BAT data
  53. GRB 090717B: Fermi GBM detection
  54. GRB 090717: Fermi GBM detection
  55. GRB 090719: Fermi GBM detection
  56. GRB 090718B: Fermi GBM detection
  57. GRB 090718: Fermi GBM detection
  58. GRB 090720: Fermi GBM detection
  59. GRB090713 optical limit by "Pi of the Sky"
  60. GRB 090712: Fermi GBM observation
  61. GRB 090713: Fermi GBM detection
  62. GRB 090709B: Fermi GBM detection
  63. GRB 090708 : Fermi GBM detection
  64. GRB 090626: Suzaku WAM observation of the prompt emission
  65. GRB 090704: Fermi GBM observation
  66. GRB 090706: Fermi GBM detection
  67. GRB 090703: Fermi GBM detection
  68. GRB 090701: Fermi GBM detection
  69. GRB 090630: Fermi GBM detection
  70. Konus-Wind observation of GRB 090626
  71. GRB 090626: IPN localization
  72. Fermi LAT observations of GRB 090626
  73. GRB 090625B: Fermi GBM observation
  74. GRB 090626: Fermi GBM detection
  75. GRB 090623: Suzaku WAM observation of the prompt emission
  76. GRB 090625: Fermi GBM detection
  77. GRB 090617: Suzaku WAM observation of the prompt emission
  78. GRB 090623: Fermi GBM detection
  79. GRB 090621B: Fermi GBM detection
  80. GRB 090621D: Fermi GBM detection
  81. GRB 090621C: Fermi GBM detection
  82. GRB 090621: Fermi GBM observation
  83. GRB 090620: Fermi GBM detecion
  84. GRB 090618: Fermi GBM observation
  85. GRB 090617: Fermi GBM detection
  86. GRB 090616: Fermi GBM detection
  87. GRB 090612: Fermi GBM detection
  88. GRB 090610C: Fermi GBM detection
  89. GRB 090610B: Fermi GBM detection
  90. GRB 090610: Fermi GBM detection
  91. SGR 0418+5729 Fermi/GBM Detection of Pulsations
  92. GRB 090602: Suzaku WAM observation of the prompt emission
  93. RXTE Discovery of Pulsations from SGR 0418+5729
  94. GRB 090531B: Fermi GBM detection
  95. Discovery of a new soft gamma repeater source, SGR 0418+5729
  96. GRB 090608: Fermi GBM detection
  97. GRB 090606: Fermi GBM detection
  98. GRB 090530B: Suzaku WAM observation of the prompt emission
  99. GRB 090602: Fermi GBM detection
  100. GRB 090528: Suzaku WAM observation of the prompt emission

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