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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"

28242 results found.

  1. GRB 100316D: Possible Supernova
  2. GRB 100219A: optical upper limit
  3. GRB 100316A: optical observations in CrAO
  4. GRB 100316D: Swift/UVOT Observations
  5. GRB 100316D: Swift XRT enhanced position and further refined analysis
  6. GRB 100316B: Swift-XRT refined analysis
  7. Tentative redshift of GRB100316D from X-ray data
  8. GRB 100316C: GROND Detection of a Optical/NIR Afterglow Candidate
  9. GRB 100316D: GROND Detection of the Optical/NIR Afterglow Candidate
  10. GRB 100316D: Gemini/GMOS and VLT/X-shooter observations
  11. GRB 100316D: VLT/X-shooter observations
  12. GRB 100316D: Swift-BAT refined analysis
  13. GRB100316C: Swift/UVOT Upper Limits
  14. GRB 100316C: Swift-BAT refined analysis
  15. GRB 100316B: Swift/UVOT observations
  16. GRB 100316C: Swift-XRT team refined analysis
  17. GRB 100316C: Enhanced Swift-XRT position
  18. GRB 100316D: Swift XRT refined analysis
  19. GRB 100316A: TAROT Calern observatory optical observations
  20. GRB 100316A: Swift-XRT refined analysis
  21. GRB 100316B: Enhanced Swift-XRT position
  22. GRB 100316A: Swift-BAT refined analysis
  23. GRB 100316B: Swift-BAT refined analysis
  24. GRB100316A: Swift/UVOT Upper Limits
  25. Trigger 416140 is almost certainly not a GRB
  26. GRB 100316C: BOOTES-3 observations
  27. GRB 100316D: Swift detection of a burst
  28. GRB 100316B: GROND Detection of the Optical/NIR Afterglow Candidate
  29. XRF 100315A: MAXI/GSC detection of a short X-ray transient
  30. GRB 100316C: Swift detection of a burst
  31. GRB 100316A: Enhanced Swift-XRT position
  32. GRB 100316B: Swift detection of a burst with optical counterpart
  33. GRB100305A: Optical upper limits at IAO
  34. GRB 100305A: Super-LOTIS early observations
  35. GRB100302A : LOAO observations and Lulin afterglow analysis
  36. GRB 100305A, Swift-BAT refined analysis
  37. GRB 100305A: Swift/UVOT Upper Limits
  38. GRB 100305A: Swift-XRT refined analysis
  39. GRB 100305A Optical Observations
  40. GRB 100305A: Enhanced Swift-XRT position
  41. GRB 100305A: Gemini-N OT candidate
  42. GRB 100305A: PAIRITEL NIR Upper Limits
  43. GRB 100305A: P60 Observations
  44. GRB 100305A: Swift detection of a burst
  45. GRB 100302A: Swift/UVOT Upper Limits
  46. GRB 100302A: Swift-XRT refined analysis
  47. GRB 100302A: Gemini-N OT confirmation
  48. GRB 100302A: Optical observations at Crni Vrh
  49. GRB 100302A: MASTER-Net optical alert observations
  50. GRB 100302A, Swift-BAT refined analysis
  51. GRB 1000302A : A possible afterglow candidate
  52. GRB 100302A: Enhanced Swift-XRT position
  53. GRB 100302A: Skynet/DAO Observations
  54. GRB 100302A: Swift detection of a burst
  55. GRB 100224B: Fermi GBM detection
  56. GRB 100206A: optical observations in CrAO
  57. GRB 100206A: optical observations in Terskol
  58. GRB 100213B: Mondy optical observations
  59. GRB 100219A: optical observations
  60. GRB 100224A SHB found in ground analysis of BAT data
  61. GRB 100225A: Fermi LAT detection
  62. GRB 100225A: Fermi GBM detection
  63. GRB 100223A: Fermi GBM detection
  64. GRB
  65. GRB 100219A: XRT refined analysis
  66. GRB100219A Akeno and Okayama MITSuME Optical Observation
  67. GRB 100219A: GROND observations
  68. GRB 100219A: NOT OA observations
  69. GRB 100219A: Enhanced Swift-XRT position
  70. GRB 100219A: Swift/UVOT Detection of the Optical Afterglow
  71. GRB 100216A: XRT Refined Analysis
  72. GRB 100219A: Swift-BAT refined analysis
  73. GRB 100219A: Pre-explosion imaging and host candidate
  74. GRB 100219A: Swift/UVOT Detection of a Source near the XRT Position
  75. GRB 100218A : Fermi GBM detection
  76. GRB 100219A: Swift detection of a burst
  77. GRB 100216A: Keck imaging
  78. GRB 100213B: GRT Optical Observation
  79. GRB 100213A: GRT Optical Observation
  80. GRB 100213A: Swift-BAT refined analysis
  81. GRB 100213B: Enhanced Swift-XRT position
  82. GRB 100213B: Gemini-N Observations
  83. GRB 100213B: Swift/UVOT Upper Limits
  84. GRB 100213A: Swift/UVOT Upper Limits
  85. GRB 100213B: PAIRITEL NIR Upper Limits
  86. GRB 100213A: Enhanced Swift-XRT position
  87. GRB 100213B: Swift-BAT refined analysis
  88. GRB 100213B: Swift XRT refined analysis
  89. GRB 100213A: SARA observations
  90. GRB 100213A: Swift XRT refined analysis
  91. GRB 100213B: NOT optical observations
  92. GRB 100213B: Swift detection of a burst
  93. GRB 100213A: Swift detection of a burst
  94. Swift/UVOT observations of GRB120212A
  95. GRB 100212A: Fermi GBM detection
  96. GRB 100212A: Swift XRT refined analysis
  97. GRB 100212A: Swift-BAT refined analysis
  98. GRB 100212A: Enhanced Swift-XRT position
  99. GRB 100212A: candidate optical afterglow
  100. GRB 100212A: Swift detection of a burst

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