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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"

28126 results found.

  1. GRB 100909A: Faulkes Telescope North afterglow candidate
  2. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  3. GRB 100909A: Swift target of opportunity observation
  4. GRB100906A: detection at 15GHz
  5. GRB100901A: IAO optical upper limits at 4 days after the burst
  6. GRB100906A: R band observations
  7. GRB100906A: non-detection at 15GHz
  8. GRB100906A: Optical observations at IAO
  9. GRB 100906A: Fermi GBM observation
  10. GRB 100906A: Swift-XRT refined analysis
  11. GRB 100906A: Enhanced Swift-XRT position
  12. GRB 100906A: Swift/UVOT Observations
  13. GRB100906A: MITSuME Okayama Optical Observation
  14. GRB 100905A: Swift/UVOT Upper Limits
  15. GRB 100901A: TLS observations, SDSS calibration, decay slope
  16. GRB 100906A: MASTER preliminary prompt+afterglow lc
  17. GRB 100906A: Swift-BAT refined analysis
  18. GRB 100906A: Swift detection of a burst with an optical afterglow
  19. GRB 100829A: MASTER optical observations
  20. GRB100905A: Optical upper limits at IAO
  21. GRB100905A: MITSuME Okayama optical upper limits
  22. GRB 100905A: Swift-XRT refined analysis.
  23. GRB100905A: 1.5m OSN upper limit
  24. GRB 100905A: Enhanced Swift-XRT position
  25. GRB 100905A: Swift-BAT refined analysis
  26. GRB 100905A: Faulkes Telescope North observations
  27. GRB 100905A: Swift detection of a burst
  28. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  29. GRB 100901A: Submm observations from SMA
  30. GRB 100904A: Swift-BAT refined analysis
  31. GRB100902A: Optical upper limits at IAO
  32. GRB10901A: Optical observations at IAO
  33. GRB 100902A: Swift-BAT refined analysis
  34. IPN Triangulation of the very bright GRB 100829A
  35. GRB 100902A: Swift XRT refined analysis
  36. GRB 100902A: Swift/UVOT Upper Limits
  37. GRB 100902A: optical observation at Mt.Terskol
  38. GRB 100901A: optical observation at Mt.Terskol
  39. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  40. GRB 100902A: Enhanced Swift-XRT position
  41. GRB 100901A: TLS Observations: Break?
  42. GRB 100901A: ISON-NM optical observations
  43. GRB 100902A: Faulkes Telescope South observations
  44. GRB 100902A: Swift detection of a burst
  45. GRB 100901A: Vega telescope optical afterglow observation
  46. Swift/UVOT Observations of GRB100901A
  47. GRB 100901A: SARA-N observations
  48. GRB 100901A: THO optical observations
  49. GRB100901A: MITSuME Okayama Optical Observation
  50. GRB 100901A: Swift-XRT Team refined analysis
  51. GRB 100901A - NOT optical observation
  52. GRB 100901A: Swift-BAT refined analysis
  53. GRB 100901A: Enhanced Swift-XRT position
  54. GRB 100901A: Swift detection of a burst with an optical afterglow
  55. GRB 100829.9: MASTER Optical Limits
  56. GRB 100823A: optical upper limit
  57. GRB 100814A: Maidanak optical observations
  58. GRB 100823A: optical observations
  59. GRB 100725B: Mondy optical upper limit
  60. GRB 100725B: Maidanak optical upper limit
  61. GRB100807A: R band observations
  62. GRB 100823A: Swift XRT refined analysis
  63. GRB 100823A - second epoch WHT observations
  64. GRB 100823A: TNG NIR observations
  65. GRB 100823A: Swift/UVOT Upper Limits
  66. GRB 100823A: WHT observations
  67. GRB 100823A: Swift-BAT refined analysis
  68. GRB 100823A: Enhanced Swift-XRT position
  69. GRB 100823A: Swift detection of a burst
  70. GRB 100814A: Suzaku WAM observation of the prompt emission
  71. GRB 100814B: Fermi GBM detection
  72. GRB 100814A: optical observations
  73. GRB100816A: MITSuME optical upper limits
  74. GRB 100814A: NOT optical observations
  75. GRB 100816A: NOT optical observations
  76. GRB 100814A : Lulin optical observation
  77. GRB 100816A : Lulin r'-band observation
  78. GRB 100816A: Swift UVOT Observations
  79. GRB100816A Swift-XRT refined analysis
  80. GRB 100816A: Swift-BAT spectral lag results
  81. GRB 100816A: 1.23m CAHA optical observations
  82. GRB 100816A, Swift-BAT refined analysis
  83. GRB 100816A: Enhanced Swift-XRT position
  84. GRB 100816A: Gemini-N imaging
  85. GRB 100816A: TAROT Calern observatory optical detection
  86. GRB 100816A: MASTER Optical Limits
  87. GRB100816A: TNG optical afterglow confirmation.
  88. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  89. GRB 100814A: Fermi GBM observation
  90. GRB 100814A: Submm observations from APEX
  91. GRB 100814A: Swift-XRT refined analysis
  92. Swift/UVOT observations of GRB100814A
  93. GRB 100814A, Swift-BAT refined analysis
  94. GRB 100814A: Enhanced Swift-XRT position
  95. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  96. GRB 100814A: Swift UVOT observations of the optical afterglow
  97. GRB 100814A: Swift detection of a burst with an optical afterglow
  98. GRB 100814A: ROTSE-III Detection of Optical Counterpart
  99. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  100. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)

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