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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"

28233 results found.

  1. Swift BAT Trigger 433953 probably not a GRB
  2. GRB100909A: MITSuME Ishigakijima Optical upper limits
  3. GRB 100909A: Swift/UVOT observations
  4. GRB 100901A: errata of GRB name in GCN 11270
  5. GRB 100909A: Swift-XRT refined analysis
  6. GRB 100906A: optical observations at Mt.Terskol
  7. GRB 100901A: optical observation in Maidanak, break confirmation
  8. GRB 100909A: Faulkes Telescope North afterglow candidate
  9. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  10. GRB 100909A: Swift target of opportunity observation
  11. GRB100906A: detection at 15GHz
  12. GRB100901A: IAO optical upper limits at 4 days after the burst
  13. GRB100906A: R band observations
  14. GRB100906A: non-detection at 15GHz
  15. GRB100906A: Optical observations at IAO
  16. GRB 100906A: Fermi GBM observation
  17. GRB 100906A: Swift-XRT refined analysis
  18. GRB 100906A: Enhanced Swift-XRT position
  19. GRB 100906A: Swift/UVOT Observations
  20. GRB100906A: MITSuME Okayama Optical Observation
  21. GRB 100905A: Swift/UVOT Upper Limits
  22. GRB 100901A: TLS observations, SDSS calibration, decay slope
  23. GRB 100906A: MASTER preliminary prompt+afterglow lc
  24. GRB 100906A: Swift-BAT refined analysis
  25. GRB 100906A: Swift detection of a burst with an optical afterglow
  26. GRB 100829A: MASTER optical observations
  27. GRB100905A: Optical upper limits at IAO
  28. GRB100905A: MITSuME Okayama optical upper limits
  29. GRB 100905A: Swift-XRT refined analysis.
  30. GRB100905A: 1.5m OSN upper limit
  31. GRB 100905A: Enhanced Swift-XRT position
  32. GRB 100905A: Swift-BAT refined analysis
  33. GRB 100905A: Faulkes Telescope North observations
  34. GRB 100905A: Swift detection of a burst
  35. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  36. GRB 100901A: Submm observations from SMA
  37. GRB 100904A: Swift-BAT refined analysis
  38. GRB100902A: Optical upper limits at IAO
  39. GRB10901A: Optical observations at IAO
  40. GRB 100902A: Swift-BAT refined analysis
  41. IPN Triangulation of the very bright GRB 100829A
  42. GRB 100902A: Swift XRT refined analysis
  43. GRB 100902A: Swift/UVOT Upper Limits
  44. GRB 100902A: optical observation at Mt.Terskol
  45. GRB 100901A: optical observation at Mt.Terskol
  46. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  47. GRB 100902A: Enhanced Swift-XRT position
  48. GRB 100901A: TLS Observations: Break?
  49. GRB 100901A: ISON-NM optical observations
  50. GRB 100902A: Faulkes Telescope South observations
  51. GRB 100902A: Swift detection of a burst
  52. GRB 100901A: Vega telescope optical afterglow observation
  53. Swift/UVOT Observations of GRB100901A
  54. GRB 100901A: SARA-N observations
  55. GRB 100901A: THO optical observations
  56. GRB100901A: MITSuME Okayama Optical Observation
  57. GRB 100901A: Swift-XRT Team refined analysis
  58. GRB 100901A - NOT optical observation
  59. GRB 100901A: Swift-BAT refined analysis
  60. GRB 100901A: Enhanced Swift-XRT position
  61. GRB 100901A: Swift detection of a burst with an optical afterglow
  62. GRB 100829.9: MASTER Optical Limits
  63. GRB 100823A: optical upper limit
  64. GRB 100814A: Maidanak optical observations
  65. GRB 100823A: optical observations
  66. GRB 100725B: Mondy optical upper limit
  67. GRB 100725B: Maidanak optical upper limit
  68. GRB100807A: R band observations
  69. GRB 100823A: Swift XRT refined analysis
  70. GRB 100823A - second epoch WHT observations
  71. GRB 100823A: TNG NIR observations
  72. GRB 100823A: Swift/UVOT Upper Limits
  73. GRB 100823A: WHT observations
  74. GRB 100823A: Swift-BAT refined analysis
  75. GRB 100823A: Enhanced Swift-XRT position
  76. GRB 100823A: Swift detection of a burst
  77. GRB 100814A: Suzaku WAM observation of the prompt emission
  78. GRB 100814B: Fermi GBM detection
  79. GRB 100814A: optical observations
  80. GRB100816A: MITSuME optical upper limits
  81. GRB 100814A: NOT optical observations
  82. GRB 100816A: NOT optical observations
  83. GRB 100814A : Lulin optical observation
  84. GRB 100816A : Lulin r'-band observation
  85. GRB 100816A: Swift UVOT Observations
  86. GRB100816A Swift-XRT refined analysis
  87. GRB 100816A: Swift-BAT spectral lag results
  88. GRB 100816A: 1.23m CAHA optical observations
  89. GRB 100816A, Swift-BAT refined analysis
  90. GRB 100816A: Enhanced Swift-XRT position
  91. GRB 100816A: Gemini-N imaging
  92. GRB 100816A: TAROT Calern observatory optical detection
  93. GRB 100816A: MASTER Optical Limits
  94. GRB100816A: TNG optical afterglow confirmation.
  95. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  96. GRB 100814A: Fermi GBM observation
  97. GRB 100814A: Submm observations from APEX
  98. GRB 100814A: Swift-XRT refined analysis
  99. Swift/UVOT observations of GRB100814A
  100. GRB 100814A, Swift-BAT refined analysis

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