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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"
  1. GRB 121202A: Swift detection of a burst
  2. GRB 121201A: GROND afterglow observations and photometric redshift
  3. GRB 121201A: Swift/UVOT Detection
  4. GRB 121201A: Swift-XRT refined Analysis
  5. GRB 121201A: Swift-BAT refined analysis
  6. GRB 121201A: Enhanced Swift-XRT position
  7. GRB 121201A: BOOTES-4 optical observations
  8. GRB 121201A: a GRB with an optical counterpart
  9. GRB 121128A: optical observation in Mondy observatory
  10. GRB 121128A: MITSuME Akeno Optical upper limits
  11. Konus-Wind observation of GRB 121127A
  12. IPN Triangulation of GRB 121127A (short/hard)
  13. GRB 121125A: optical upper limit
  14. GRB 121128A: optical observation in Mondy observatory
  15. GRB 121128A: WSRT radio observation
  16. GRB 121128A: Swift/UVOT Detection
  17. GRB 121128A: Swift-XRT refined Analysis
  18. GRB 121128A: Enhanced Swift-XRT position
  19. GRB 121122A: Fermi GBM observation
  20. GRB 121128A: RAPTOR Detection During Gamma-Ray Emitting Interval
  21. GRB 121128A: Fermi GBM observation
  22. GRB 121128A, Swift-BAT refined analysis
  23. Konus-Wind observation of GRB 121128A
  24. GRB 121128A - Gemini North redshift
  25. GRB 121128A: FTN optical afterglow confirmation
  26. GRB 121128A: Swift detection of a burst with an optical counterpart
  27. GRB 121123A: Suzaku WAM observation of the prompt emission
  28. Konus-Wind observation of GRB 121122A
  29. GRB 121117A: Terskol obseravtions
  30. GRB 121123A: Swift/UVOT Observations
  31. GRB 121125A: Swift/UVOT Detection
  32. IPN Triangulation of GRB 121122A (long/intense)
  33. GRB 121118B: Suzaku WAM observation of the prompt emission
  34. GRB 121125A: Swift-XRT refined Analysis
  35. GRB 121125A: Enhanced Swift-XRT position
  36. GRB 121125A: Fermi GBM Observation
  37. GRB 121125A: Swift-BAT refined analysis
  38. GRB 121125A: LOAO Observation
  39. GRB 121125A: MASTER-NET optical observations
  40. GRB 121125A: Swift detection of a burst with optical counterpart
  41. GRB 121123A: GROND observations
  42. GRB 121123A: Enhanced Swift-XRT position
  43. GRB 121123A: Swift-BAT refined analysis
  44. GRB 121123A: Swift-XRT refined Analysis
  45. GRB 121123A: optical observations
  46. GRB 121123A: BOOTES-4 and IAC80 optical observations
  47. GRB 121123A: NOT optical observations
  48. GRB 121123A: Fermi GBM observation
  49. GRB 121123A: MASTER-NET optical limit
  50. GRB 121123A: GMG optical observation
  51. GRB 121123A: Swift detection of a burst with optical counterpart
  52. GRB 121108A: optical upper limit
  53. GRB 121117A: Optical observations
  54. Konus-Wind observation of GRB 121118B
  55. GRB 121117A: optical upper limit
  56. IPN Triangulation of GRB 121118B (long/intense)
  57. GRB 121117A: GROND confirmation of the UVOT afterglow candidate
  58. IPN Triangulation of GRB 121118A
  59. Swift-BAT trigger 538575 is not astrophysical
  60. GRB 121117A: Swift/UVOT Observations
  61. GRB 121117A: Swift-XRT refined Analysis
  62. GRB 121117A: MASTER prompt optical limit
  63. GRB 121117A, Swift-BAT refined analysis
  64. GRB 121117A: ROTSE-III Optical Limits
  65. GRB 121117A: BOOTES-3 early optical upper limit
  66. GRB 121117A: Swift detection of a burst
  67. Swift trigger 538575: Magellan Observations
  68. Fermi GBM trigger 121115.186 is not a GRB
  69. Trigger 538084: Swift detection of XTE J1739-302
  70. GRB 121108A: Swift-XRT refined Analysis
  71. GRB 121108A: Swift/UVOT Upper Limits
  72. GRB 121108A, Swift-BAT refined analysis
  73. GRB 121108A: Xinglong TNT upper limit
  74. GRB 121108A: Enhanced Swift-XRT position
  75. GRB 121108A : Lulin/TRIPOL2 Optical Limits
  76. GRB 121108A: Optical observations
  77. GRB 121108A: MITSuME Ishigakijima upper limits
  78. GRB 121108A: Weihai observatory optical observations
  79. GRB 121108A: MASTER early prompt optical limit
  80. GRB 121108A: TAROT Calern observatory optical observations
  81. GRB 121108A: Swift detection of a burst
  82. GRB 121031A: Fermi GBM detection
  83. GRB 121028A: Swift/UVOT Upper Limits
  84. GRB 121031A, Early peak observed with Swift-BAT
  85. GRB 121102A: Swift/UVOT Upper Limits
  86. GRB 121031A: Swift/UVOT Upper Limits
  87. GRB 121031A: Swift-XRT refined Analysis
  88. GRB 121102A: Enhanced Swift-XRT position
  89. GRB 121031A: Enhanced Swift-XRT position
  90. GRB 121102A: Swift-XRT refined Analysis
  91. GRB 121102A: Swift-BAT refined analysis
  92. GRB 121025A: Confirmation of the X-ray afterglow
  93. GRB 121029A Suzaku WAM observation of the prompt emission
  94. GRB 121102A : a long GRB detected by INTEGRAL
  95. GRB 121102A: Swift detection of a burst
  96. GRB 121027A: sub-mm upper limit
  97. GRB 121031A: Swift-BAT refined analysis
  98. GRB 121031A: Prompt enhanced Swift-XRT position
  99. GRB 121031A: Swift detection of a burst
  100. Swift Quick-look and HEASARC are back online

Advanced

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