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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"

28116 results found.

  1. GRB 100316D: Swift detection of a burst
  2. GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate
  3. XRF 100315A: MAXI/GSC detection of a short X-ray transient
  4. GRB 100316C: Swift detection of a burst
  5. GRB 100316A: Enhanced Swift-XRT position
  6. GRB 100316B: Swift detection of a burst with optical counterpart
  7. GRB100305A: Optical upper limits at IAO
  8. GRB 100305A: Super-LOTIS early observations
  9. GRB100302A : LOAO observations and Lulin afterglow analysis
  10. GRB 100305A, Swift-BAT refined analysis
  11. GRB 100305A: Swift/UVOT Upper Limits
  12. GRB 100305A: Swift-XRT refined analysis
  13. GRB 100305A Optical Observations
  14. GRB 100305A: Enhanced Swift-XRT position
  15. GRB 100305A: Gemini-N OT candidate
  16. GRB 100305A: PAIRITEL NIR Upper Limits
  17. GRB 100305A: P60 Observations
  18. GRB 100305A: Swift detection of a burst
  19. GRB 100302A: Swift/UVOT Upper Limits
  20. GRB 100302A: Swift-XRT refined analysis
  21. GRB 100302A: Gemini-N OT confirmation
  22. GRB 100302A: Optical observations at Crni Vrh
  23. GRB 100302A: MASTER-Net optical alert observations
  24. GRB 100302A, Swift-BAT refined analysis
  25. GRB 1000302A : A possible afterglow candidate
  26. GRB 100302A: Enhanced Swift-XRT position
  27. GRB 100302A: Skynet/DAO Observations
  28. GRB 100302A: Swift detection of a burst
  29. GRB 100224B: Fermi GBM detection
  30. GRB 100206A: optical observations in CrAO
  31. GRB 100206A: optical observations in Terskol
  32. GRB 100213B: Mondy optical observations
  33. GRB 100219A: optical observations
  34. GRB 100224A SHB found in ground analysis of BAT data
  35. GRB 100225A: Fermi LAT detection
  36. GRB 100225A: Fermi GBM detection
  37. GRB 100223A: Fermi GBM detection
  38. GRB
  39. GRB 100219A: XRT refined analysis
  40. GRB100219A Akeno and Okayama MITSuME Optical Observation
  41. GRB 100219A: GROND observations
  42. GRB 100219A: NOT OA observations
  43. GRB 100219A: Enhanced Swift-XRT position
  44. GRB 100219A: Swift/UVOT Detection of the Optical Afterglow
  45. GRB 100216A: XRT Refined Analysis
  46. GRB 100219A: Swift-BAT refined analysis
  47. GRB 100219A: Pre-explosion imaging and host candidate
  48. GRB 100219A: Swift/UVOT Detection of a Source near the XRT Position
  49. GRB 100218A : Fermi GBM detection
  50. GRB 100219A: Swift detection of a burst
  51. GRB 100216A: Keck imaging
  52. GRB 100213B: GRT Optical Observation
  53. GRB 100213A: GRT Optical Observation
  54. GRB 100213A: Swift-BAT refined analysis
  55. GRB 100213B: Enhanced Swift-XRT position
  56. GRB 100213B: Gemini-N Observations
  57. GRB 100213B: Swift/UVOT Upper Limits
  58. GRB 100213A: Swift/UVOT Upper Limits
  59. GRB 100213B: PAIRITEL NIR Upper Limits
  60. GRB 100213A: Enhanced Swift-XRT position
  61. GRB 100213B: Swift-BAT refined analysis
  62. GRB 100213B: Swift XRT refined analysis
  63. GRB 100213A: SARA observations
  64. GRB 100213A: Swift XRT refined analysis
  65. GRB 100213B: NOT optical observations
  66. GRB 100213B: Swift detection of a burst
  67. GRB 100213A: Swift detection of a burst
  68. Swift/UVOT observations of GRB120212A
  69. GRB 100212A: Fermi GBM detection
  70. GRB 100212A: Swift XRT refined analysis
  71. GRB 100212A: Swift-BAT refined analysis
  72. GRB 100212A: Enhanced Swift-XRT position
  73. GRB 100212A: candidate optical afterglow
  74. GRB 100212A: Swift detection of a burst
  75. GRB 091127: Detection of a Supernova
  76. GRB 100205A: Keck limits on an underlying host galaxy
  77. GRB 100205A: BOAO/LOAO zYJK observation
  78. GRB 100205B: Fermi GBM detection
  79. GRB 100206A: GROND upper limits
  80. GRB 100206A: Gemini-North observations
  81. GRB 100206A: Swift/UVOT Upper Limits
  82. GRB 100131A: MASTER-Net optical alert observations
  83. GRB 100206A: YNAO-GMG observations
  84. GRB 100206A: MASTER-Net optical alert observations
  85. GRB 100206A: PAIRITEL Photometry of Host Candidate
  86. GRB100206: MITSuME optical upper limits
  87. GRB 100206A: NOT NIR observations
  88. GRB 100206A, RIMOTS optical upper limits
  89. GRB 100205A: GROND upper limits
  90. GRB 100206A: Swift-XRT refined analysis
  91. GRB 100206A: Optical limit
  92. GRB 100206A: Swift-BAT refined analysis
  93. GRB 100206A: Enhanced Swift-XRT position
  94. GRB 100206A: Pre-explosion imaging and host candidate
  95. GRB 100206A: Swift detection of a short hard burst
  96. GRB100205A: CFHT z'-band observation
  97. GRB 100205A: Gemini-N + NIRI photometry
  98. GRB 100130B: Fermi GBM detection
  99. GRB 100113A: Fermi GBM detection
  100. GRB 100205A: Swift-BAT refined analysis

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