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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"

28293 results found.

  1. GRB 130122A: Enhanced Swift-XRT position
  2. GRB 130122A: T100 observations
  3. GRB 130122A: Swift detection of a burst with an optical counterpart
  4. Short GRB 121226A: TNG observation of the host galaxy
  5. GRB 121225B: Suzaku WAM observation of the prompt emission
  6. GRB 130102B: MASTER synchronous observations
  7. GRB 130102A: Swift/UVOT Upper Limits
  8. Konus-Wind observation of GRB 130102B
  9. GRB 130102A: P60 Observations
  10. GRB 130102A: Swift-BAT refined analysis
  11. GRB 130102A: Swift-XRT refined Analysis
  12. GRB 130102A: Enhanced Swift-XRT position
  13. GRB 130102A: Swift detection of a burst
  14. GRB 121229A: Swift-XRT refined Analysis
  15. GRB 121229A, Swift-BAT refined analysis
  16. GRB 121229A: Swift/UVOT Upper Limits
  17. GRB 121229A: Enhanced Swift-XRT position
  18. GRB 121229A: VLT/X-shooter redshift
  19. Swift Trigger 544381 is unlikely to be a GRB
  20. GRB 121229A: GROND detection of the afterglow
  21. Skynet/PROMPT observations of GRB121229a
  22. GRB 121229A: Swift detection of a burst
  23. GRB 121226A: Swift/UVOT Upper Limits
  24. GRB 121226A: Swift-XRT refined Analysis
  25. GRB 121226A, Swift-BAT refined analysis
  26. GRB 121226A: NOT optical upper limit
  27. GRB 121226A: Optical Observations
  28. GRB 121226A: MITSuME Okayama Optical upper limits
  29. GRB 121226A: Zadko observatory - Gingin optical observations
  30. GRB 121226A: Swift detection of a burst
  31. GRB 121225B: Fermi GBM observation
  32. GRB 121225B: Fermi LAT Detection
  33. GRB 121217A: Swift-BAT refined analysis
  34. GRB 121217A theoretical estimate of redshift and of supernova occurrence
  35. GRB 121217A: Fermi GBM observation
  36. GRB 121217A: Swift-XRT refined Analysis
  37. GRB 121217A: Swift/UVOT Detection
  38. GRB 121217A: GROND Detection of the Afterglow
  39. GRB 121217A: Enhanced Swift-XRT position
  40. GRB 121217A: Swift detection of a burst
  41. GRB 121209A: Swift/UVOT Upper Limits
  42. GRB121212A: NOT optical imaging
  43. GRB 121211A: Continued RATIR Optical and NIR Observations, Fading
  44. GRB 121212A: Maidanak optical observations
  45. GRB 121211A: Fermi GBM observation
  46. GRB 121211A: RATIR Optical and NIR Observations
  47. GRB 121212A: RAPTOR Limits During Gamma-Ray Emitting Interval
  48. GRB 121211A: RAPTOR Limits During Gamma-Ray Emitting Interval
  49. GRB 121212A: PAIRITEL NIR Observations
  50. GRB 121212A: Swift-XRT refined Analysis
  51. GRB 121212A: P60 Observations
  52. GRB 121212A: optical observations in ISON-NM observatory
  53. GRB121212A: Swift/UVOT Detection
  54. GRB 121212A: Swift-BAT refined analysis
  55. GRB 121211A: Swift-BAT refined analysis
  56. GRB 121212A: Enhanced Swift-XRT position
  57. GRB 121212A: A long GRB detected by INTEGRAL
  58. GRB 121212A: Swift detection of a burst
  59. GRB 121211A: Swift/UVOT Detection
  60. GRB 121211A: MITSuME Okayama Optical Observation
  61. GRB 121211A: Swift-XRT refined Analysis
  62. GRB 121211A: Enhanced Swift-XRT position
  63. GRB 121211A: Swift detection of a burst with an optical counterpart
  64. GRB 121209A: Swift-XRT refined Analysis
  65. GRB 121209A: Swift-BAT refined analysis
  66. GRB 121209A: Enhanced Swift-XRT position
  67. GRB 121209A: GROND optical afterglow candidate
  68. GRB 121209A: Gemini-South imaging
  69. GRB 121209A: PAIRITEL NIR Observations
  70. GRB 121209A: Swift detection of a burst
  71. GRB 121127A: Suzaku WAM observation of the prompt emission
  72. GRB 121128A: Optical Observations
  73. GRB 121122A: Suzaku WAM observation of the prompt emission
  74. GRB 121202A: Swift/UVOT Upper Limits
  75. GRB 121202A: Swift-XRT refined Analysis
  76. GRB 121202A: Fermi GBM observation
  77. GRB 121202A: Enhanced Swift-XRT position
  78. GRB 121202A: Swift-BAT refined analysis
  79. GRB 121202A: Swift-XRT observations
  80. GRB 121201A: X-shooter redshift
  81. GRB121202A: Swift/UVOT Observations
  82. GRB 121202A: TAROT Calern observatory optical observations
  83. GRB 121201A: GROND afterglow observations and photometric redshift
  84. GRB 121201A: Swift/UVOT Detection
  85. GRB 121201A: Swift-XRT refined Analysis
  86. GRB 121201A: Swift-BAT refined analysis
  87. GRB 121201A: Enhanced Swift-XRT position
  88. GRB 121201A: a GRB with an optical counterpart
  89. GRB 121128A: optical observation in Mondy observatory
  90. GRB 121125A: optical upper limit
  91. GRB 121128A: optical observation in Mondy observatory
  92. GRB 121128A: Swift/UVOT Detection
  93. GRB 121128A: Swift-XRT refined Analysis
  94. GRB 121128A: Enhanced Swift-XRT position
  95. GRB 121122A: Fermi GBM observation
  96. GRB 121128A: RAPTOR Detection During Gamma-Ray Emitting Interval
  97. GRB 121128A: Fermi GBM observation
  98. GRB 121128A, Swift-BAT refined analysis
  99. GRB 121128A: Swift detection of a burst with an optical counterpart
  100. GRB 121123A: Suzaku WAM observation of the prompt emission

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