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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"

42637 results found.

  1. GRB 100619A: Swift-BAT refined analysis
  2. GRB 100619A: Swift detection of a burst
  3. GRB 100614A: Gemini/NIRI Observations
  4. GRB 100615A: Gemini/NIRI Observations
  5. XRF 100616a : MAXI/GSC detection of a probable XRF
  6. Fermi GBM trigger 100612038 is not a GRB
  7. GRB 100615A: Swift/UVOT Upper Limits
  8. GRB 100614A: Swift/UVOT Upper Limits
  9. GRB 100614A: NOT optical upper limits
  10. GRB 100614A: MASTER-Net optical alert observations
  11. GRB 100614A: Swift-BAT refined analysis
  12. GRB 100615A: Fermi GBM detection
  13. GRB 100615A: Swift-BAT refined analysis
  14. GRB 100614A: Enhanced Swift-XRT position
  15. GRB 100615A: Enhanced Swift-XRT position
  16. GRB 100615A: Swift-XRT refined analysis
  17. GRB 100614A: Swift-XRT refined analysis
  18. GRB 100615A: GROND observations, upper limits
  19. GRB 100615A: PAIRITEL NIR Upper Limits
  20. GRB 100615A: NTT/Ultracam imaging
  21. GRB 100615A: Swift detection of a burst
  22. GRB 100614A: WHT I-band observations
  23. GRB 100614A: BOOTES-2/TELMA optical observations
  24. GRB 100614A: Liverpool Telescope Observations
  25. GRB 100614A: Swift detection of a burst
  26. GRB 100606A: Suzaku WAM observation of the prompt emission
  27. GRB 100606A: GROND observations
  28. Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
  29. Konus-Wind observation of GRB 100606A
  30. Radio detection of GRB100418a with ATCA
  31. GRB 100606A: Gemini-South imaging
  32. GRB 100606A Swift-XRT refined analysis
  33. GRB 100606A: Swift-BAT refined analysis
  34. GRB 100606A: Enhanced Swift-XRT position
  35. Swift Trigger 424040 is not a GRB
  36. GRB 100606A: Prompt enhanced Swift-XRT position
  37. GRB 100606A: Swift detection of a burst
  38. Swift detection of outburst from the SFXT IGR J18410-0535
  39. GRB 100111A: Maidanak optical observations
  40. GRB 100418A: Maidanak optical observations
  41. GRB 100513A: CrAO optical observations
  42. GRB 100514A: CrAO optical observations
  43. GRB 100526A: optical upper limit
  44. Konus-Wind observation of GRB 100528A
  45. GRB 100528A: Faulkes Telescope North Detection
  46. GRB 100528A: GROND detection in all bands
  47. GRB 100528A: NOT optical observation
  48. Swift UVOT and UVOT-enhanced XRT position for GRB 100528A
  49. GRB100526B: GROND Upper limits
  50. GRB 100528A: Fermi GBM observation
  51. GRB 100528A: SuperAGILE Localization of a Long GRB
  52. GRB 100526B: Swift-XRT confirmation of fading afterglow
  53. GRB 100526B: Swift/UVOT Upper Limits
  54. GRB 100526A: Swift/UVOT Upper Limits
  55. GRB 100526A: Gemini/NIRI infrared afterglow candidate
  56. GRB 100526A: NOT optical upper limit
  57. GRB 100526A: Swift XRT refined analysis
  58. GRB 100526B: Swift-BAT refined analysis
  59. GRB 100526B: Swift XRT/UVOT observations
  60. GRB 100526A: Swift-BAT refined analysis
  61. GRB 100526A: Enhanced Swift-XRT position
  62. GRB 100526B: Swift detection of a probable GRB
  63. GRB 100526A: MASTER-Net optical alert observations
  64. GRB 100526A: Swift detection of a burst
  65. Konus-Wind observation of GRB 100522A
  66. GRB100522A: Suzaku WAM observation of the prompt emission
  67. GRB 100418A: Subaru late-time optical imaging and spectroscopy
  68. GRB 100522A: Fermi GBM observation
  69. GRB 100522A: Swift XRT refined analysis
  70. GRB 100522A, Swift-BAT refined analysis
  71. GRB 100522A: Enhanced Swift-XRT position
  72. GRB 100522A: NIR observations from CAHA
  73. GRB 100522A: BOOTES-2 optical limit
  74. GRB 100522A: Swift detection of a burst
  75. GRB 100418A: CrAO optical observations
  76. GRB 100518A: GROND afterglow observation and photo-z
  77. GRB 100518A: Swift-XRT refined analysis
  78. GRB 100518A: optical afterglow decay
  79. GRB 100518A: BOOTES-3 optical observations
  80. Update to the configuration of the Fermi-LAT onboard GRB search
  81. GRB 100518A: Faulkes Telescope North Afterglow Candidate
  82. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  83. Swift-BAT trigger 422437 is not anything astrophysical
  84. GRB 100518A: a long GRB detected with INTEGRAL
  85. Swift Trigger 422437 is probably not a GRB
  86. Fermi/GBM trigger 295791986 - unreliable location
  87. GRB 100517A: MASTER-Net wide field camera prompt optical observations
  88. GRB 100513A: EVLA radio observation
  89. GRB 100514A: optical afterglow confirmation
  90. GRB 100514A: Swift/UVOT Observations
  91. GRB 100514A: YNAO-GMG observations
  92. GRB 100514A: Swift XRT refined analysis
  93. GRB 100514A: MASTER-Net optical observations
  94. GRB 100514A: Enhanced Swift-XRT position
  95. GRB 100514A: Swift-BAT refined analysis
  96. GRB 100514A: Faulkes Telescope South observations
  97. GRB 100514A: Swift detection of a burst
  98. GRB 100513A: Faulkes Telescope South observations
  99. GRB 100513A: Swift/UVOT upper limits
  100. GRB 100513A: Swift XRT refined analysis

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