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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"

19662 results found.

  1. GRB 100614A: MASTER-Net optical alert observations
  2. GRB 100614A: Swift-BAT refined analysis
  3. GRB 100615A: Fermi GBM detection
  4. GRB 100615A: Swift-BAT refined analysis
  5. GRB 100614A: Enhanced Swift-XRT position
  6. GRB 100615A: Enhanced Swift-XRT position
  7. GRB 100615A: Swift-XRT refined analysis
  8. GRB 100614A: Swift-XRT refined analysis
  9. GRB 100615A: PAIRITEL NIR Upper Limits
  10. GRB 100615A: Swift detection of a burst
  11. GRB 100614A: Liverpool Telescope Observations
  12. GRB 100614A: Swift detection of a burst
  13. GRB 100606A: Suzaku WAM observation of the prompt emission
  14. Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
  15. Konus-Wind observation of GRB 100606A
  16. Radio detection of GRB100418a with ATCA
  17. GRB 100606A: Swift/UVOT Upper Limits
  18. GRB 100606A Swift-XRT refined analysis
  19. GRB 100606A: Swift-BAT refined analysis
  20. GRB 100606A: Enhanced Swift-XRT position
  21. Swift Trigger 424040 is not a GRB
  22. GRB 100606A: Prompt enhanced Swift-XRT position
  23. GRB 100606A: Swift detection of a burst
  24. Swift detection of outburst from the SFXT IGR J18410-0535
  25. GRB 100111A: Maidanak optical observations
  26. GRB 100418A: Maidanak optical observations
  27. GRB 100513A: CrAO optical observations
  28. GRB 100514A: CrAO optical observations
  29. GRB 100526A: optical upper limit
  30. Swift UVOT and UVOT-enhanced XRT position for GRB 100528A
  31. GRB100526B: GROND Upper limits
  32. GRB 100526B: Swift-XRT confirmation of fading afterglow
  33. GRB 100526B: Swift/UVOT Upper Limits
  34. GRB 100526A: Swift/UVOT Upper Limits
  35. GRB 100526A: Swift XRT refined analysis
  36. GRB 100526B: Swift-BAT refined analysis
  37. GRB 100526B: Swift XRT/UVOT observations
  38. GRB 100526A: Swift-BAT refined analysis
  39. GRB 100526A: Enhanced Swift-XRT position
  40. GRB 100526B: Swift detection of a probable GRB
  41. GRB 100526A: MASTER-Net optical alert observations
  42. GRB 100526A: Swift detection of a burst
  43. Konus-Wind observation of GRB 100522A
  44. GRB100522A: Suzaku WAM observation of the prompt emission
  45. GRB 100522A: GROND observations, upper limits
  46. Swift/UVOT observations of GRB100522A.
  47. GRB 100522A: Fermi GBM observation
  48. GRB 100522A: Swift XRT refined analysis
  49. GRB 100522A, Swift-BAT refined analysis
  50. GRB 100522A: Enhanced Swift-XRT position
  51. GRB 100522A: BOOTES-2 optical limit
  52. GRB 100522A: Swift detection of a burst
  53. GRB 100418A: CrAO optical observations
  54. GRB 100518A: Swift/UVOT Upper Limits
  55. GRB 100518A: Swift-XRT refined analysis
  56. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  57. Swift-BAT trigger 422437 is not anything astrophysical
  58. Swift Trigger 422437 is probably not a GRB
  59. GRB 100514A: optical afterglow confirmation
  60. GRB 100514A: Swift/UVOT Observations
  61. GRB 100514A: Swift XRT refined analysis
  62. GRB 100514A: MASTER-Net optical observations
  63. GRB 100514A: Enhanced Swift-XRT position
  64. GRB 100514A: Swift-BAT refined analysis
  65. GRB 100514A: Faulkes Telescope South observations
  66. GRB 100514A: Swift detection of a burst
  67. GRB 100513A: Faulkes Telescope South observations
  68. GRB 100513A: Swift/UVOT upper limits
  69. GRB 100513A, RIMOTS optical upper limits
  70. GRB 100513A: Swift XRT refined analysis
  71. GRB 100513A: Swift-BAT refined analysis
  72. GRB 100513A: Enhanced Swift-XRT position
  73. GRB 100513A: PAIRITEL NIR afterglow candidate
  74. GRB 100513A: Swift detection of a burst
  75. GRB 100511A: Super-LOTIS early observations
  76. Swift-BAT trigger 421695 is likely not astrophysical
  77. GRB 100511A, RIMOTS optical upper limits
  78. Trigger 421695: Swift detection of a possible burst
  79. GRB100508A: Further Swift/UVOT Observations
  80. GRB 100508A: GROND Detection of the optical afterglow
  81. GRB 100508A: Swift-XRT Refined analysis
  82. GRB 100508A: Swift-BAT refined analysis
  83. GRB 100508A: Enhanced Swift-XRT position
  84. GRB100508A: Swift/UVOT Detection of the Afterglow
  85. GRB 100508A: ROTSE-III Optical Limits
  86. GRB 100508A: Swift detection of a burst
  87. Swift-BAT refined analysis of trigger 421262
  88. GRB 100504A: Fermi GBM observation
  89. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  90. GRB 100504A: Swift/UVOT Observations
  91. GRB 100418A: Flattening of the Swift/UVOT Optical Light Curve
  92. GRB 100504A: Swift-XRT refined analysis
  93. GRB 100504A: Enhanced Swift-XRT position
  94. GRB 100504A: GROND Upper limits
  95. GRB 100504A: Swift-BAT refined analysis
  96. GRB 100504A: UVOT-enhanced XRT position
  97. GRB 100504A: Swift detection of a burst
  98. Swift-BAT trigger 421072 is not astrophyical
  99. INTEGRAL observations of Swift GRB trigger 421072
  100. GRB100423A : Suzaku WAM observation of the prompt emission

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