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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"

39431 results found.

  1. GRB 121202A: Fermi GBM observation
  2. GRB 121202A: Enhanced Swift-XRT position
  3. GRB 121202A: Swift-BAT refined analysis
  4. GRB 121202A: Swift-XRT observations
  5. GRB 121201A: X-shooter redshift
  6. GRB121202A: Swift/UVOT Observations
  7. GRB 121202A: TAROT Calern observatory optical observations
  8. GRB 121202A: Swift detection of a burst
  9. GRB 121201A: GROND afterglow observations and photometric redshift
  10. GRB 121201A: Swift/UVOT Detection
  11. GRB 121201A: Swift-XRT refined Analysis
  12. GRB 121201A: Swift-BAT refined analysis
  13. GRB 121201A: Enhanced Swift-XRT position
  14. GRB 121201A: BOOTES-4 optical observations
  15. GRB 121201A: a GRB with an optical counterpart
  16. GRB 121128A: optical observation in Mondy observatory
  17. GRB 121128A: MITSuME Akeno Optical upper limits
  18. Konus-Wind observation of GRB 121127A
  19. IPN Triangulation of GRB 121127A (short/hard)
  20. GRB 121125A: optical upper limit
  21. GRB 121128A: optical observation in Mondy observatory
  22. GRB 121128A: WSRT radio observation
  23. GRB 121128A: Swift/UVOT Detection
  24. GRB 121128A: Swift-XRT refined Analysis
  25. GRB 121128A: Enhanced Swift-XRT position
  26. GRB 121122A: Fermi GBM observation
  27. GRB 121128A: RAPTOR Detection During Gamma-Ray Emitting Interval
  28. GRB 121128A: Fermi GBM observation
  29. GRB 121128A, Swift-BAT refined analysis
  30. Konus-Wind observation of GRB 121128A
  31. GRB 121128A - Gemini North redshift
  32. GRB 121128A: FTN optical afterglow confirmation
  33. GRB 121128A: Swift detection of a burst with an optical counterpart
  34. GRB 121123A: Suzaku WAM observation of the prompt emission
  35. Konus-Wind observation of GRB 121122A
  36. GRB 121117A: Terskol obseravtions
  37. GRB 121123A: Swift/UVOT Observations
  38. GRB 121125A: Swift/UVOT Detection
  39. IPN Triangulation of GRB 121122A (long/intense)
  40. GRB 121118B: Suzaku WAM observation of the prompt emission
  41. GRB 121125A: Swift-XRT refined Analysis
  42. GRB 121125A: Enhanced Swift-XRT position
  43. GRB 121125A: Fermi GBM Observation
  44. GRB 121125A: Swift-BAT refined analysis
  45. GRB 121125A: LOAO Observation
  46. GRB 121125A: MASTER-NET optical observations
  47. GRB 121125A: Swift detection of a burst with optical counterpart
  48. GRB 121123A: GROND observations
  49. GRB 121123A: Enhanced Swift-XRT position
  50. GRB 121123A: Swift-BAT refined analysis
  51. GRB 121123A: Swift-XRT refined Analysis
  52. GRB 121123A: optical observations
  53. GRB 121123A: BOOTES-4 and IAC80 optical observations
  54. GRB 121123A: NOT optical observations
  55. GRB 121123A: Fermi GBM observation
  56. GRB 121123A: MASTER-NET optical limit
  57. GRB 121123A: GMG optical observation
  58. GRB 121123A: Swift detection of a burst with optical counterpart
  59. GRB 121108A: optical upper limit
  60. GRB 121117A: Optical observations
  61. Konus-Wind observation of GRB 121118B
  62. GRB 121117A: optical upper limit
  63. IPN Triangulation of GRB 121118B (long/intense)
  64. GRB 121117A: GROND confirmation of the UVOT afterglow candidate
  65. IPN Triangulation of GRB 121118A
  66. GRB 121117A: Swift/UVOT Observations
  67. GRB 121117A: Swift-XRT refined Analysis
  68. GRB 121117A: MASTER prompt optical limit
  69. GRB 121117A, Swift-BAT refined analysis
  70. GRB 121117A: ROTSE-III Optical Limits
  71. GRB 121117A: BOOTES-3 early optical upper limit
  72. GRB 121117A: Swift detection of a burst
  73. Fermi GBM trigger 121115.186 is not a GRB
  74. Trigger 538084: Swift detection of XTE J1739-302
  75. GRB 121108A: Swift-XRT refined Analysis
  76. GRB 121108A: Swift/UVOT Upper Limits
  77. GRB 121108A, Swift-BAT refined analysis
  78. GRB 121108A: Xinglong TNT upper limit
  79. GRB 121108A: Enhanced Swift-XRT position
  80. GRB 121108A : Lulin/TRIPOL2 Optical Limits
  81. GRB 121108A: Optical observations
  82. GRB 121108A: MITSuME Ishigakijima upper limits
  83. GRB 121108A: Weihai observatory optical observations
  84. GRB 121108A: MASTER early prompt optical limit
  85. GRB 121108A: TAROT Calern observatory optical observations
  86. GRB 121108A: Swift detection of a burst
  87. GRB 121031A: Fermi GBM detection
  88. GRB 121028A: Swift/UVOT Upper Limits
  89. GRB 121031A, Early peak observed with Swift-BAT
  90. GRB 121102A: Swift/UVOT Upper Limits
  91. GRB 121031A: Swift/UVOT Upper Limits
  92. GRB 121031A: Swift-XRT refined Analysis
  93. GRB 121102A: Enhanced Swift-XRT position
  94. GRB 121031A: Enhanced Swift-XRT position
  95. GRB 121102A: Swift-XRT refined Analysis
  96. GRB 121102A: Swift-BAT refined analysis
  97. GRB 121025A: Confirmation of the X-ray afterglow
  98. GRB 121029A Suzaku WAM observation of the prompt emission
  99. GRB 121102A : a long GRB detected by INTEGRAL
  100. GRB 121102A: Swift detection of a burst

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