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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"

27117 results found.

  1. GRB 070110: Swift detection of a burst with a possible optical afterglow
  2. IBAS Alert n. 4047: Not a GRB
  3. GRB070107: Swift/XRT refined analysis
  4. GRB 070107: Possible UVOT Afterglow
  5. GRB 070107, Swift-BAT refined analysis
  6. GRB 070107: Swift detection of a burst
  7. GRB070103: APO SPIcam i' and z' limits
  8. GRB 070103: Swift/UVOT Upper limits
  9. GRB070103: Swift XRT refined analysis
  10. GRB 070103, Swift-BAT refined analysis
  11. GRB 070103: TAROT Calern observatory optical observations
  12. GRB 070103: Swift detection of a burst
  13. Retractions of previous Swift-BAT triggers
  14. Konus-Wind observation of GRB 061222A
  15. GRB 061222B: TAROT La Silla observatory early optical observations
  16. GRB 061218: TAROT La Silla observatory early optical observations
  17. GRB 061222A: MITSuME Akeno optical upper limits
  18. GRB 061222B: MITSuME Akeno optical upper limits
  19. GRB 061222B, Swift-BAT refined analysis
  20. GRB061222A Swift/UVOT: Upper Limits
  21. GRB 061222B: Swift/UVOT Upper limits
  22. GRB061222B: Swift-XRT Refined Analysis
  23. GRB 061222B: BOOTES-IR optical observations
  24. GRB 061222B: SARA upper limit
  25. GRB 061222A, Swift-BAT refined analysis
  26. GRB 061222B: TAROT La Silla observatory afterglow observation
  27. GRB 061222B: TAROT La Silla observatory optical observations
  28. GRB 061222B: Swift detection of a burst
  29. GRB 061222A: Prompt ROTSE-III Optical Limits
  30. GRB 061222: Swift detection of a burst
  31. GRB 061218: TAROT La Silla observatory optical observations
  32. GRB 061217: TAROT Calern observatory optical observations
  33. GRB 061218: TORTOREM optical upper limits
  34. GRB 061218, Swift-BAT refined analysis
  35. GRB 061218: REM prompt observations
  36. Swift triggers (#251863) on a possible burst
  37. GRB061217: Swift/UVOT refined analysis.
  38. GRB061217 - Swift/XRT refined analysis
  39. GRB 061217, Further Swift-BAT refined analysis of the short hard burst
  40. GRB 061217, Swift-BAT refined analysis
  41. GRB 061217: REM prompt observations
  42. GRB 061217: ROTSE-III Optical Limits
  43. GRB 061217: Swift detection of a short hard burst
  44. GRB061210: Swift/UVOT observations
  45. Swift-BAT Trigger 250908 is a Cosmic Ray Shower event
  46. GRB 061210: Swift XRT analysis - Possible counterparts
  47. GRB 061210 : Faulkes North Telescope optical limit
  48. GRB 061214(?): ROTSE-III Optical Limits
  49. GRB 061214(?): Swift detection of a possible burst
  50. GRB 061210: Suzaku WAM observation of the prompt emission
  51. Swift/BAT trigger #250033 is due to a known source during loss of
  52. GRB 061213: MASTER-VWF-Kislovodsk optical candidate
  53. GRB 061213: MASTER-VWF-Kislovodsk observations
  54. GRB 061202: Suzaku WAM observation of the prompt emission
  55. GRB 061210, Swift-BAT refined analysis of the SHB
  56. GRB 061210: Swift-BAT detection of a short burst
  57. Optical Afterglow observations of GRB 061126
  58. GRB061126: update on the Swift-XRT afterglow light curve
  59. GRB 061201: UVOT Observations of a Fading Optical Afterglow
  60. GRB 061202: TORTOREM optical upper limits
  61. GRB061126 : NMSU 1.0m observations
  62. GRB061202: FRAM early follow-up limit
  63. GRB061202 optical limit by "Pi of the Sky"
  64. Konus-Wind observation of GRB 061201
  65. GRB061202: optical/NIR observations with REM
  66. GRB061202: Swift/UVOT Upper Limits
  67. GRB 061202, Swift-BAT refined analysis
  68. GRB 061202: Swift detection of a burst
  69. GRB 061201: Swift XRT Team refined analysis
  70. GRB 061201: Initial UVOT Observations
  71. GRB 061201, Swift-BAT refined analysis of the SHB
  72. GRB 061201: Swift detection of a short hard burst
  73. GRB 061201: Coincidence with a Galaxy Cluster
  74. GRB 061122: GETS observation
  75. GRB 061126: RAPTOR Optical Detection During Gamma-Ray Emission
  76. GRB 061126: Early Super-LOTIS Observations
  77. GRB 061126: optical observation
  78. GRB061126: Optical afterglow observations from MIRO
  79. GRB061126: Optical afterglow observations from MIRO
  80. GRB 061126 : SDSS Pre-Burst Observations
  81. GRB 061126: Swift-XRT refined analysis
  82. GRB 061126: Swift/UVOT Observations
  83. GRB 061126, Swift-BAT refined analysis
  84. GRB 061126: SARA Observations
  85. GRB 061126: Early Detection of the IR Afterglow
  86. GRB 061126: Faulkes Telescope North Optical Observations
  87. GRB 061126: Swift/UVOT Afterglow Detection
  88. GRB 061126: XRT position
  89. GRB 061126: Swift detection of a burst
  90. GRB 061121: Ep,i - Eiso correlation
  91. GRB061122: Swift/UVOT Optical Observations
  92. GRB 061121: ART detection in Ic
  93. GRB061122: Swift-XRT position
  94. Konus-Wind and Konus-A observations of GRB 061121
  95. Swift-BAT trigger 239987 is not a GRB
  96. GRB 061121: Swift/UVOT Observations
  97. GRB 061121: Swift-XRT Team Refined Analysis
  98. GRB 061121, Swift-BAT refined analysis
  99. GRB061121, optical observation
  100. GRB 061121: Faulkes Telescope North Optical Observation

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