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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"

28098 results found.

  1. GRB 061222B: TAROT La Silla observatory optical observations
  2. GRB 061222B: Swift detection of a burst
  3. GRB 061222b: optical afterglow
  4. GRB 061222A: Prompt ROTSE-III Optical Limits
  5. GRB 061222: Swift detection of a burst
  6. GRB 061218: TAROT La Silla observatory optical observations
  7. GRB 061217: TAROT Calern observatory optical observations
  8. GRB 061218: TORTOREM optical upper limits
  9. GRB 061218, Swift-BAT refined analysis
  10. GRB061217: VLT NIR observations
  11. GRB 061218, SMARTS optical/IR observations
  12. GRB 061218: REM prompt observations
  13. Swift triggers (#251863) on a possible burst
  14. GRB061217: Swift/UVOT refined analysis.
  15. GRB 061217: optical observations at Calar Alto
  16. GRB061217 - Swift/XRT refined analysis
  17. GRB 061217, Swift-BAT refined analysis
  18. GRB 061217: Magellan Observations
  19. GRB 061217: REM prompt observations
  20. GRB 061217: ROTSE-III Optical Limits
  21. GRB061210: Swift/UVOT observations
  22. GRB 061210: Swift XRT analysis - Possible counterparts
  23. GRB 061210: Gemini/GMOS Observations
  24. GRB 061126: Radio Observations
  25. GRB061210: Radio Observations
  26. GRB 061202: Suzaku WAM observation of the prompt emission
  27. GRB 061210, Swift-BAT refined analysis of the SHB
  28. Optical Afterglow observations of GRB 061126
  29. GRB 060926: MASTER: discovery of the optical flare
  30. GRB 061201: UVOT Observations of a Fading Optical Afterglow
  31. GRB 061202: TORTOREM optical upper limits
  32. GRB 061201: VLT optical decay
  33. GRB 061201: SOAR Confirmation of Candidate Afterglow
  34. GRB061202: FRAM early follow-up limit
  35. GRB061202 optical limit by "Pi of the Sky"
  36. GRB061202: optical/NIR observations with REM
  37. GRB061202: Swift/UVOT Upper Limits
  38. GRB 061202, Swift-BAT refined analysis
  39. GRB 061202: Swift detection of a burst
  40. GRB 061201: VLT optical observations
  41. GRB 061201: Initial UVOT Observations
  42. GRB 061201, Swift-BAT refined analysis of the SHB
  43. GRB 061201: Swift detection of a short hard burst
  44. INT+WFC observations of GRB 061126
  45. Swift XRT on-board boresight update
  46. GRB 061126: optical observation
  47. GRB 061126: Tautenburg afterglow observations
  48. GRB061126: Optical afterglow observations from MIRO
  49. GRB061126: Optical afterglow observations from MIRO
  50. GRB 061126 : SDSS Pre-Burst Observations
  51. GRB 061126: Swift-XRT refined analysis
  52. GRB 061126: Swift/UVOT Observations
  53. GRB 061126, Swift-BAT refined analysis
  54. GRB 061126: Early Detection of the IR Afterglow
  55. GRB 061126: Swift/UVOT Afterglow Detection
  56. GRB 061122: Candidate Optical Afterglow
  57. GRB 061121: Ep,i - Eiso correlation
  58. GRB061122: Swift/UVOT Optical Observations
  59. GRB061121: P60 Observations
  60. Radio detection of GRB 061121
  61. GRB061122: Swift-XRT position
  62. INTEGRAL results on GRB 061122
  63. Swift-BAT trigger 239987 is not a GRB
  64. GRB 061121: Swift/UVOT Observations
  65. GRB 061121: Swift-XRT Team Refined Analysis
  66. GRB 061121, Swift-BAT refined analysis
  67. GRB061121, optical observation
  68. GRB 061121: Optical observation at the KANATA 1.5m telescope
  69. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  70. GRB 061121: Swift detection of a bright burst with an optical counterpart
  71. GRB 060605: NIR Observations
  72. GRB 050915B: optical afterglow
  73. Swift-BAT triggers 238544 and 238546 are not GRBs
  74. Swift/UVOT Upper Limits for GRB061110b
  75. Swift/UVOT Upper Limits for GRB061110a
  76. GRB 061110B, Swift-BAT refined analysis
  77. GRB061110B: Optical observations at Crni Vrh
  78. GRB 061110A: Swift XRT refined analysis
  79. GRB 061110A, Swift-BAT refined analysis
  80. GRB 061110B: TAROT Calern observatory optical observations
  81. GRB 061110B: Swift detection of a burst
  82. GRB 061110: Candidate confirmed
  83. GRB 061110 : Optical afterglow candidate
  84. GRB 061110: ROTSE-III Optical Limits
  85. GRB 061110: Swift detection of a burst
  86. GRB061110A - Optical Non-detection
  87. GRB 061109: optical observation
  88. GRB 061109: TAROT Calern observatory optical observations
  89. GRB 061027: TAROT La Silla observatory optical observations
  90. GRB 061028: Swift/XRT Astrometry Correction
  91. GRB 061102: Swift/UVOT Magnitude Upper Limits
  92. GRB 061102, XRT refined analysis
  93. GRB061102B: Super-LOTIS observations
  94. GRB 061028: Optical R passband observations
  95. GRB 061102B: Swift detection of a possible burst
  96. GRB 061102, Swift-BAT refined analysis
  97. GRB 061102: Swift detection of a burst
  98. GRB 061028: VLA Observation
  99. GRB 061004: Swift/XRT Astrometry Correction
  100. GRB 060801: Swift/XRT Astrometry Correction

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