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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"

19353 results found.

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

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