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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"

19358 results found.

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

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