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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"

28248 results found.

  1. GRB 121211A: RATIR Optical and NIR Observations
  2. GRB 121212A: RAPTOR Limits During Gamma-Ray Emitting Interval
  3. GRB 121211A: RAPTOR Limits During Gamma-Ray Emitting Interval
  4. GRB 121212A: PAIRITEL NIR Observations
  5. GRB 121212A: Swift-XRT refined Analysis
  6. GRB 121212A: P60 Observations
  7. GRB 121212A: optical observations in ISON-NM observatory
  8. GRB121212A: Swift/UVOT Detection
  9. GRB 121212A: Swift-BAT refined analysis
  10. GRB 121211A: Swift-BAT refined analysis
  11. GRB 121212A: Enhanced Swift-XRT position
  12. GRB 121212A: A long GRB detected by INTEGRAL
  13. GRB 121212A: Swift detection of a burst
  14. GRB 121211A: Swift/UVOT Detection
  15. GRB 121211A: MITSuME Okayama Optical Observation
  16. GRB 121211A: Swift-XRT refined Analysis
  17. GRB 121211A: Enhanced Swift-XRT position
  18. GRB 121211A: Swift detection of a burst with an optical counterpart
  19. GRB 121209A: Swift-XRT refined Analysis
  20. GRB 121209A: Swift-BAT refined analysis
  21. GRB 121209A: Enhanced Swift-XRT position
  22. GRB 121209A: GROND optical afterglow candidate
  23. GRB 121209A: Gemini-South imaging
  24. GRB 121209A: PAIRITEL NIR Observations
  25. GRB 121209A: Swift detection of a burst
  26. GRB 121127A: Suzaku WAM observation of the prompt emission
  27. GRB 121128A: Optical Observations
  28. GRB 121122A: Suzaku WAM observation of the prompt emission
  29. GRB 121202A: Swift/UVOT Upper Limits
  30. GRB 121202A: Swift-XRT refined Analysis
  31. GRB 121202A: Fermi GBM observation
  32. GRB 121202A: Enhanced Swift-XRT position
  33. GRB 121202A: Swift-BAT refined analysis
  34. GRB 121202A: Swift-XRT observations
  35. GRB 121201A: X-shooter redshift
  36. GRB121202A: Swift/UVOT Observations
  37. GRB 121202A: TAROT Calern observatory optical observations
  38. GRB 121201A: GROND afterglow observations and photometric redshift
  39. GRB 121201A: Swift/UVOT Detection
  40. GRB 121201A: Swift-XRT refined Analysis
  41. GRB 121201A: Swift-BAT refined analysis
  42. GRB 121201A: Enhanced Swift-XRT position
  43. GRB 121201A: a GRB with an optical counterpart
  44. GRB 121128A: optical observation in Mondy observatory
  45. GRB 121125A: optical upper limit
  46. GRB 121128A: optical observation in Mondy observatory
  47. GRB 121128A: Swift/UVOT Detection
  48. GRB 121128A: Swift-XRT refined Analysis
  49. GRB 121128A: Enhanced Swift-XRT position
  50. GRB 121122A: Fermi GBM observation
  51. GRB 121128A: RAPTOR Detection During Gamma-Ray Emitting Interval
  52. GRB 121128A: Fermi GBM observation
  53. GRB 121128A, Swift-BAT refined analysis
  54. GRB 121128A: Swift detection of a burst with an optical counterpart
  55. GRB 121123A: Suzaku WAM observation of the prompt emission
  56. GRB 121117A: Terskol obseravtions
  57. GRB 121123A: Swift/UVOT Observations
  58. GRB 121125A: Swift/UVOT Detection
  59. IPN Triangulation of GRB 121122A (long/intense)
  60. GRB 121118B: Suzaku WAM observation of the prompt emission
  61. GRB 121125A: Swift-XRT refined Analysis
  62. GRB 121125A: Enhanced Swift-XRT position
  63. GRB 121125A: Fermi GBM Observation
  64. GRB 121125A: Swift-BAT refined analysis
  65. GRB 121125A: LOAO Observation
  66. GRB 121125A: Swift detection of a burst with optical counterpart
  67. GRB 121123A: GROND observations
  68. GRB 121123A: Enhanced Swift-XRT position
  69. GRB 121123A: Swift-BAT refined analysis
  70. GRB 121123A: Swift-XRT refined Analysis
  71. GRB 121123A: optical observations
  72. GRB 121123A: NOT optical observations
  73. GRB 121123A: Fermi GBM observation
  74. GRB 121123A: MASTER-NET optical limit
  75. GRB 121123A: GMG optical observation
  76. GRB 121123A: Swift detection of a burst with optical counterpart
  77. GRB 121108A: optical upper limit
  78. GRB 121117A: Optical observations
  79. GRB 121117A: optical upper limit
  80. IPN Triangulation of GRB 121118B (long/intense)
  81. GRB 121117A: GROND confirmation of the UVOT afterglow candidate
  82. GRB 121117A: Swift/UVOT Observations
  83. GRB 121117A: Swift-XRT refined Analysis
  84. GRB 121117A, Swift-BAT refined analysis
  85. GRB 121117A: BOOTES-3 early optical upper limit
  86. GRB 121117A: Swift detection of a burst
  87. GRB 121108A: Swift-XRT refined Analysis
  88. GRB 121108A: Swift/UVOT Upper Limits
  89. GRB 121108A, Swift-BAT refined analysis
  90. GRB 121108A: Enhanced Swift-XRT position
  91. GRB 121108A : Lulin/TRIPOL2 Optical Limits
  92. GRB 121108A: MITSuME Ishigakijima upper limits
  93. GRB 121108A: Weihai observatory optical observations
  94. GRB 121108A: TAROT Calern observatory optical observations
  95. GRB 121108A: Swift detection of a burst
  96. GRB 121031A: Fermi GBM detection
  97. GRB 121028A: Swift/UVOT Upper Limits
  98. GRB 121031A, Early peak observed with Swift-BAT
  99. GRB 121102A: Swift/UVOT Upper Limits
  100. GRB 121031A: Swift/UVOT Upper Limits

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