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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

19354 results found.

  1. GRB 060124: Optical Observations at Tautenburg
  2. GRB 060117: Suzaku WAM observation of the prompt emission
  3. GRB060124:MASTER optical observation
  4. GRB 060111B: Suzaku WAM observation of the prompt emission
  5. GRB 060124: Swift-BAT detection of a burst
  6. GRB 060116: Radio Detection
  7. GRB 060116: MARGE optical observations
  8. GRB 060121: Swift/UVOT upper limits
  9. GRB 060121: Liverpool Telescopes optical limits
  10. GRB 060121: Swift XRT refined analysis
  11. GRB 060121: Swift XRT refined position
  12. GRB 060117: pseudo-z from spectral parameters of the prompt emission
  13. Konus-Wind observation of GRB 060117
  14. GRB 060117: Refined analysis of the Swift-BAT burst
  15. GRB 060117: FRAM optical afterglow candidate
  16. GRB 060117: Swift-BAT detection of a bright burst
  17. GRB 060116: Refined analysis of the Swift-BAT burst
  18. GRB 060116: Swift/UVOT upper limits
  19. GRB060115: REM observations
  20. GRB 060110: XRT position and analysis
  21. GRB 060116: ROTSE-III Optical Limits
  22. GRB060116: XRT position
  23. GRB060116: Faulkes North observation
  24. GRB 060116: Swift-BAT detection of a burst
  25. GRB 060115: Refined analysis of the Swift-BAT burst
  26. GRB 060115: Swift/UVOT upper limits
  27. GRB 060115: Swift XRT refined analysis
  28. GRB 060114: Swift/UVOT Observations
  29. GRB 060115: MITSuME optical afterglow candidate
  30. GRB 060115: Swift detection of a burst
  31. GRB 060114: Swift XRT upper limit
  32. GRB 060110: KAIT observations
  33. GRB 060111B: Swift XRT refined analysis
  34. GRB 060111A: refined UVOT anaysis
  35. GRB 060111B: TAROT optical observation
  36. GRB060111A: RTT150 optical observations
  37. GRB060111B: RTT150, possible host galaxy
  38. GRB 060111B: Refined analysis of the Swift-BAT burst
  39. GRB 060110: MARGE observations
  40. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  41. GRB 060111B: Swift detection of a burst
  42. GRB 060111: Swift-BAT Refined Analysis
  43. GRB 060111: TAROT optical observation
  44. GRB 060111: possible UVOT counterpart
  45. GRB060111 : XRT refined analysis
  46. GRB 060111: ROTSE-III Optical Limits
  47. GRB 060111: Swift detection of a burst
  48. GRB 060110: Swift-BAT refined analysis
  49. GRB 060109: Swift-BAT refined analysis
  50. GRB 060110a: RAPTOR detection of early optical emission.
  51. Correction to GRB 060109 XRT analysis
  52. GRB 060110: Swift-BAT detection of a burst
  53. GRB 060109: Refined Swift-XRT analysis
  54. GRB 060109: Swift/UVOT upper limits
  55. Swift UVOT correction to GCN 4455
  56. GRB 060109: Swift Detection of a long burst
  57. GRB 060108: Refined XRT analysis
  58. GRB 060108: VLT J-band observations
  59. GRB 060108: Swift/UVOT upper limits
  60. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  61. GRB060108: Faulkes Telescope observation
  62. GRB 060108: Refined analysis of the Swift-BAT burst
  63. GRB 060108: Swift XRT position
  64. GRB060108: Swift detection of its 100th GRB
  65. GRB 060105: Radio observations
  66. Konus-Wind observation of GRB 060105
  67. GRB 060105: Swift/UVOT upper limits
  68. GRB 060105: BAT refined analysis
  69. GRB 060105: XRT refined analysis
  70. GRB060105: Swift detection of a bright long burst
  71. Swift-BAT trigger 175653 is not an astrophysical source
  72. Swift-BAT trigger 175653 is probably not a GRB
  73. GRB 060102: Swift-BAT refined analysis
  74. Time Correction to GRB 060102
  75. GRB 060102: Swift-BAT detection of a burst
  76. GRB051211B: optical observations
  77. GRB051227: SARA Observations
  78. GRB 051221B: Optical Observations with Kuiper 1.54m
  79. GRB051221B: Radio observations
  80. GRB051227: Radio Observations
  81. GRB 051227: Swift/UVOT Upper Limits (Possible U-band
  82. GRB 051227: MDM Observation
  83. GRB 051227: Joint Swift-HETE Spectral Analysis
  84. GRB 051227: XRT refined analysis
  85. GRB 051227: Further analysis of the Swift-BAT burst
  86. GRB 051227: Refined analysis of the Swift-BAT burst
  87. GRB051227: SDSS pre-burst observations
  88. GRB 051227: Swift detection of a burst
  89. Konus-Wind observation of GRB 051221A
  90. GRB051221A: Suzaku WAM observation of the prompt emission
  91. GRB051016: analysis of the XMM-Newton observation
  92. GRB 051221A: Detection at 251nm with Swift UVOT
  93. GRB 051221A: Chandra Afterglow Position
  94. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  95. GRB 051221B: ROTSE-III Optical Limits
  96. GRB 051221B: TAROT optical limits
  97. GRB 051221A: WSRT Radio Observations
  98. GRB 051221B: Refined analysis of the Swift-BAT burst
  99. Possible GRB 051221B: MDM Optical Detection
  100. GRB 051221A: RAPTOR Fading Counterpart Constraint

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