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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"

37675 results found.

  1. GRB 100621A: VLT/X-shooter redshift
  2. GRB 100621A: Swift-BAT refined analysis
  3. GRB 100621A: GROND observation of bright NIR afterglow
  4. GRB 100621A: Enhanced Swift-XRT position
  5. GRB 100621A: Prompt enhanced Swift-XRT position
  6. GRB 100621A: ROTSE-III Optical Limits
  7. GRB 100621A: Swift detection of a burst
  8. GRB 100606A: Optical Limits
  9. GRB 100619A: Fermi GBM detection
  10. GRB 100619A: Swift/UVOT Upper Limits
  11. GRB 100619A: Swift-XRT refind analysis
  12. GRB 100619A: Enhanced Swift-XRT position
  13. GRB 100619A: Swift-BAT refined analysis
  14. GRB 100619A: Swift detection of a burst
  15. GRB 100614A: Gemini/NIRI Observations
  16. GRB 100615A: Gemini/NIRI Observations
  17. Fermi GBM trigger 100612038 is not a GRB
  18. GRB 100615A: Swift/UVOT Upper Limits
  19. GRB 100614A: Swift/UVOT Upper Limits
  20. GRB 100614A: NOT optical upper limits
  21. GRB 100614A: MASTER-Net optical alert observations
  22. GRB 100614A: Swift-BAT refined analysis
  23. GRB 100615A: Fermi GBM detection
  24. GRB 100615A: Swift-BAT refined analysis
  25. GRB 100614A: Enhanced Swift-XRT position
  26. GRB 100615A: Enhanced Swift-XRT position
  27. GRB 100615A: Swift-XRT refined analysis
  28. GRB 100614A: Swift-XRT refined analysis
  29. GRB 100614 : XMM-Newton observation
  30. GRB 100615A: GROND observations, upper limits
  31. GRB 100615A: PAIRITEL NIR Upper Limits
  32. GRB 100615A: NTT/Ultracam imaging
  33. GRB 100615A: Swift detection of a burst
  34. GRB 100614A: WHT I-band observations
  35. GRB 100614A: BOOTES-2/TELMA optical observations
  36. GRB 100614A: Liverpool Telescope Observations
  37. GRB 100614A: Swift detection of a burst
  38. GRB 100606A: Suzaku WAM observation of the prompt emission
  39. GRB 100606A: GROND observations
  40. Konus-Wind observation of GRB 100606A
  41. Radio detection of GRB100418a with ATCA
  42. GRB 100606A: Gemini-South imaging
  43. GRB 100606A: Swift/UVOT Upper Limits
  44. GRB 100606A Swift-XRT refined analysis
  45. GRB 100606A: Swift-BAT refined analysis
  46. GRB 100606A: Enhanced Swift-XRT position
  47. Swift Trigger 424040 is not a GRB
  48. GRB 100606A: Prompt enhanced Swift-XRT position
  49. GRB 100606A: Swift detection of a burst
  50. GRB 100111A: Maidanak optical observations
  51. GRB 100418A: Maidanak optical observations
  52. GRB 100513A: CrAO optical observations
  53. GRB 100514A: CrAO optical observations
  54. GRB 100526A: optical upper limit
  55. Konus-Wind observation of GRB 100528A
  56. GRB 100528A: Faulkes Telescope North Detection
  57. GRB 100528A: GROND detection in all bands
  58. GRB 100528A: NOT optical observation
  59. Swift UVOT and UVOT-enhanced XRT position for GRB 100528A
  60. GRB100526B: GROND Upper limits
  61. GRB 100528A: Fermi GBM observation
  62. GRB 100528A: SuperAGILE Localization of a Long GRB
  63. GRB 100526B: Swift-XRT confirmation of fading afterglow
  64. GRB 100526B: Swift/UVOT Upper Limits
  65. GRB 100526A: Swift/UVOT Upper Limits
  66. GRB 100526A: Gemini/NIRI infrared afterglow candidate
  67. GRB 100526A: NOT optical upper limit
  68. GRB 100526A: Swift XRT refined analysis
  69. GRB 100526B: Swift-BAT refined analysis
  70. GRB 100526B: Swift XRT/UVOT observations
  71. GRB 100526A: Swift-BAT refined analysis
  72. GRB 100526A: Enhanced Swift-XRT position
  73. GRB 100526B: Swift detection of a probable GRB
  74. GRB 100526A: MASTER-Net optical alert observations
  75. GRB 100526A: Swift detection of a burst
  76. Konus-Wind observation of GRB 100522A
  77. GRB100522A: Suzaku WAM observation of the prompt emission
  78. GRB 100418A: Subaru late-time optical imaging and spectroscopy
  79. GRB 100522A: GROND observations, upper limits
  80. GRB 100522A: Fermi GBM observation
  81. GRB 100522A: Swift XRT refined analysis
  82. GRB 100522A, Swift-BAT refined analysis
  83. GRB 100522A: Enhanced Swift-XRT position
  84. GRB 100522A: NIR observations from CAHA
  85. GRB 100522A: BOOTES-2 optical limit
  86. GRB 100522A: Swift detection of a burst
  87. GRB 100418A: CrAO optical observations
  88. GRB 100518A: GROND afterglow observation and photo-z
  89. GRB 100518A: Swift/UVOT Upper Limits
  90. GRB 100518A: Swift-XRT refined analysis
  91. GRB 100518A: optical afterglow decay
  92. GRB 100518A: BOOTES-3 optical observations
  93. Update to the configuration of the Fermi-LAT onboard GRB search
  94. GRB 100518A: Faulkes Telescope North Afterglow Candidate
  95. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  96. GRB 100513A: MITSuME Akeno Optical Observation
  97. Swift-BAT trigger 422437 is not anything astrophysical
  98. GRB 100518A: a long GRB detected with INTEGRAL
  99. Swift Trigger 422437 is probably not a GRB
  100. Fermi/GBM trigger 295791986 - unreliable location

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