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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"

19023 results found.

  1. GRB060204B, optical observation
  2. GRB060204B - SDSS pre-burst observations
  3. GRB 060203: Swift-BAT refined analysis
  4. GRB 060204B: Swift detection of a burst
  5. GRB 060203: RTT150 optical observations
  6. GRB060203: Swift XRT Team Refined Analysis
  7. GRB060203 - Swift UVOT observation
  8. Swift-BAT trigger is GRB 060203
  9. GRB060203: Observations with SARA
  10. GRB 060203: P60 Confirmation of Optical Afterglow
  11. Possible GRB 060203: candidate optical counterpart
  12. Swift BAT Trigger 180151: Swift XRT source detection
  13. Possible GRB 060203: optical observations at Asiago
  14. Swift-BAT trigger 180151 is unknown origin at this time
  15. GRB 060202: Refined analysis of the Swift-BAT burst
  16. GRB060202, optical observation
  17. GRB 060202: Swift/UVOT upper limits
  18. GRB 060202: Swift XRT Team Refined Analysis
  19. GRB060202: Faulkes North observation
  20. GRB 060202: Swift detection of a burst
  21. GRB 060130: Swift/XRT observation
  22. GRB 060123: VLA Radio Observations
  23. Possible GRB 051221B: MDM Correction
  24. GRB 060123: Swift refined analysis of an unusual GRB
  25. GRB060124, BVRcIc field calibration
  26. GRB060105: refined analysis of the Suzaku observation
  27. GRB 060124: HETE detection and spectrum of the main peak
  28. Konus-Wind observation of GRB 060124
  29. GRB060124: detailed XRT analysis
  30. GRB 060124 Optical Observations
  31. GRB 060124: R band Observations
  32. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  33. GRB 060123: Swift detection of a very long, faint burst
  34. GRB 060124: TAROT optical limits
  35. GRB 060124: Swift/UVOT Observation
  36. GRB 060124: Confirmation of the Afterglow
  37. GRB 060124: XRT position
  38. GRB 060124: Optical Observations at Tautenburg
  39. GRB 060117: Suzaku WAM observation of the prompt emission
  40. GRB060124:MASTER optical observation
  41. GRB 060111B: Suzaku WAM observation of the prompt emission
  42. GRB 060124: Swift-BAT detection of a burst
  43. GRB 060116: Radio Detection
  44. GRB 060116: MARGE optical observations
  45. GRB 060121: Swift/UVOT upper limits
  46. GRB 060121: Liverpool Telescopes optical limits
  47. GRB 060121: Swift XRT refined analysis
  48. GRB 060121: Swift XRT refined position
  49. GRB 060117: pseudo-z from spectral parameters of the prompt emission
  50. Konus-Wind observation of GRB 060117
  51. GRB 060117: Refined analysis of the Swift-BAT burst
  52. GRB 060117: FRAM optical afterglow candidate
  53. GRB 060117: Swift-BAT detection of a bright burst
  54. GRB 060116: Refined analysis of the Swift-BAT burst
  55. GRB 060116: Swift/UVOT upper limits
  56. GRB060115: REM observations
  57. GRB 060110: XRT position and analysis
  58. GRB 060116: ROTSE-III Optical Limits
  59. GRB060116: XRT position
  60. GRB060116: Faulkes North observation
  61. GRB 060116: Swift-BAT detection of a burst
  62. GRB 060115: Refined analysis of the Swift-BAT burst
  63. GRB 060115: Swift/UVOT upper limits
  64. GRB 060115: Swift XRT refined analysis
  65. GRB 060114: Swift/UVOT Observations
  66. GRB 060115: MITSuME optical afterglow candidate
  67. GRB 060115: Swift detection of a burst
  68. GRB 060114: Swift XRT upper limit
  69. GRB 060110: KAIT observations
  70. GRB 060111B: Swift XRT refined analysis
  71. GRB 060111A: refined UVOT anaysis
  72. GRB 060111B: TAROT optical observation
  73. GRB060111A: RTT150 optical observations
  74. GRB060111B: RTT150, possible host galaxy
  75. GRB 060111B: Refined analysis of the Swift-BAT burst
  76. GRB 060110: MARGE observations
  77. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  78. GRB 060111B: Swift detection of a burst
  79. GRB 060111: Swift-BAT Refined Analysis
  80. GRB 060111: TAROT optical observation
  81. GRB 060111: possible UVOT counterpart
  82. GRB060111 : XRT refined analysis
  83. GRB 060111: ROTSE-III Optical Limits
  84. GRB 060111: Swift detection of a burst
  85. GRB 060110: Swift-BAT refined analysis
  86. GRB 060109: Swift-BAT refined analysis
  87. GRB 060110a: RAPTOR detection of early optical emission.
  88. Correction to GRB 060109 XRT analysis
  89. GRB 060110: Swift-BAT detection of a burst
  90. GRB 060109: Refined Swift-XRT analysis
  91. GRB 060109: Swift/UVOT upper limits
  92. Swift UVOT correction to GCN 4455
  93. GRB 060109: Swift Detection of a long burst
  94. GRB 060108: Refined XRT analysis
  95. GRB 060108: VLT J-band observations
  96. GRB 060108: Swift/UVOT upper limits
  97. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  98. GRB060108: Faulkes Telescope observation
  99. GRB 060108: Refined analysis of the Swift-BAT burst
  100. GRB 060108: Swift XRT position

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