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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"

28296 results found.

  1. GRB 130122A: Swift-BAT refined analysis
  2. GRB 130122A: Swift-XRT refined Analysis
  3. GRB 130122A: Xinglong optical upper limit
  4. GRB 130122A: Enhanced Swift-XRT position
  5. GRB 130122A: T100 observations
  6. GRB 130122A: Swift detection of a burst with an optical counterpart
  7. Short GRB 121226A: TNG observation of the host galaxy
  8. GRB 121225B: Suzaku WAM observation of the prompt emission
  9. GRB 130102B: MASTER synchronous observations
  10. GRB 130102A: Swift/UVOT Upper Limits
  11. Konus-Wind observation of GRB 130102B
  12. GRB 130102A: P60 Observations
  13. GRB 130102A: Swift-BAT refined analysis
  14. GRB 130102A: Swift-XRT refined Analysis
  15. GRB 130102A: Enhanced Swift-XRT position
  16. GRB 130102A: Swift detection of a burst
  17. GRB 121229A: Swift-XRT refined Analysis
  18. GRB 121229A, Swift-BAT refined analysis
  19. GRB 121229A: Swift/UVOT Upper Limits
  20. GRB 121229A: Enhanced Swift-XRT position
  21. GRB 121229A: VLT/X-shooter redshift
  22. Swift Trigger 544381 is unlikely to be a GRB
  23. GRB 121229A: GROND detection of the afterglow
  24. Skynet/PROMPT observations of GRB121229a
  25. GRB 121229A: Swift detection of a burst
  26. GRB 121226A: Swift/UVOT Upper Limits
  27. GRB 121226A: Swift-XRT refined Analysis
  28. GRB 121226A, Swift-BAT refined analysis
  29. GRB 121226A: NOT optical upper limit
  30. GRB 121226A: Optical Observations
  31. GRB 121226A: MITSuME Okayama Optical upper limits
  32. GRB 121226A: Zadko observatory - Gingin optical observations
  33. GRB 121226A: Swift detection of a burst
  34. GRB 121225B: Fermi GBM observation
  35. GRB 121225B: Fermi LAT Detection
  36. GRB 121217A: Swift-BAT refined analysis
  37. GRB 121217A theoretical estimate of redshift and of supernova occurrence
  38. GRB 121217A: Fermi GBM observation
  39. GRB 121217A: Swift-XRT refined Analysis
  40. GRB 121217A: Swift/UVOT Detection
  41. GRB 121217A: GROND Detection of the Afterglow
  42. GRB 121217A: Enhanced Swift-XRT position
  43. GRB 121217A: Swift detection of a burst
  44. GRB 121209A: Swift/UVOT Upper Limits
  45. GRB121212A: NOT optical imaging
  46. GRB 121211A: Continued RATIR Optical and NIR Observations, Fading
  47. GRB 121212A: Maidanak optical observations
  48. GRB 121211A: Fermi GBM observation
  49. GRB 121211A: RATIR Optical and NIR Observations
  50. GRB 121212A: RAPTOR Limits During Gamma-Ray Emitting Interval
  51. GRB 121211A: RAPTOR Limits During Gamma-Ray Emitting Interval
  52. GRB 121212A: PAIRITEL NIR Observations
  53. GRB 121212A: Swift-XRT refined Analysis
  54. GRB 121212A: P60 Observations
  55. GRB 121212A: optical observations in ISON-NM observatory
  56. GRB121212A: Swift/UVOT Detection
  57. GRB 121212A: Swift-BAT refined analysis
  58. GRB 121211A: Swift-BAT refined analysis
  59. GRB 121212A: Enhanced Swift-XRT position
  60. GRB 121212A: A long GRB detected by INTEGRAL
  61. GRB 121212A: Swift detection of a burst
  62. GRB 121211A: Swift/UVOT Detection
  63. GRB 121211A: MITSuME Okayama Optical Observation
  64. GRB 121211A: Swift-XRT refined Analysis
  65. GRB 121211A: Enhanced Swift-XRT position
  66. GRB 121211A: Swift detection of a burst with an optical counterpart
  67. GRB 121209A: Swift-XRT refined Analysis
  68. GRB 121209A: Swift-BAT refined analysis
  69. GRB 121209A: Enhanced Swift-XRT position
  70. GRB 121209A: GROND optical afterglow candidate
  71. GRB 121209A: Gemini-South imaging
  72. GRB 121209A: PAIRITEL NIR Observations
  73. GRB 121209A: Swift detection of a burst
  74. GRB 121127A: Suzaku WAM observation of the prompt emission
  75. GRB 121128A: Optical Observations
  76. GRB 121122A: Suzaku WAM observation of the prompt emission
  77. GRB 121202A: Swift/UVOT Upper Limits
  78. GRB 121202A: Swift-XRT refined Analysis
  79. GRB 121202A: Fermi GBM observation
  80. GRB 121202A: Enhanced Swift-XRT position
  81. GRB 121202A: Swift-BAT refined analysis
  82. GRB 121202A: Swift-XRT observations
  83. GRB 121201A: X-shooter redshift
  84. GRB121202A: Swift/UVOT Observations
  85. GRB 121202A: TAROT Calern observatory optical observations
  86. GRB 121201A: GROND afterglow observations and photometric redshift
  87. GRB 121201A: Swift/UVOT Detection
  88. GRB 121201A: Swift-XRT refined Analysis
  89. GRB 121201A: Swift-BAT refined analysis
  90. GRB 121201A: Enhanced Swift-XRT position
  91. GRB 121201A: a GRB with an optical counterpart
  92. GRB 121128A: optical observation in Mondy observatory
  93. GRB 121125A: optical upper limit
  94. GRB 121128A: optical observation in Mondy observatory
  95. GRB 121128A: Swift/UVOT Detection
  96. GRB 121128A: Swift-XRT refined Analysis
  97. GRB 121128A: Enhanced Swift-XRT position
  98. GRB 121122A: Fermi GBM observation
  99. GRB 121128A: RAPTOR Detection During Gamma-Ray Emitting Interval
  100. GRB 121128A: Fermi GBM observation

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