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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"

25905 results found.

  1. Konus-Wind observation of GRB 060117
  2. GRB 060116: possible I-J dropout
  3. GRB060108: photometric redshift determination
  4. GRB 060117: Refined analysis of the Swift-BAT burst
  5. GRB 060116: PROMPT Observations
  6. GRB 060117: FRAM refined analysis
  7. GRB 060117: FRAM optical afterglow candidate
  8. GRB 060117: Swift-BAT detection of a bright burst
  9. GRB 060116: VLT optical observations
  10. GRB 060116: Refined analysis of the Swift-BAT burst
  11. GRB 060115: PROMPT Observations
  12. GRB 060116: XRT refined analysis
  13. GRB 060116: IR Candidate Afterglow
  14. GRB 060116: Swift/UVOT upper limits
  15. GRB060115: REM observations
  16. GRB 060110: XRT position and analysis
  17. GRB 060116 : Lulin optical limit
  18. GRB 060116: ROTSE-III Optical Limits
  19. GRB060116: XRT position
  20. GRB060116: Faulkes North observation
  21. GRB 060116: Swift-BAT detection of a burst
  22. GRB 060115: Refined analysis of the Swift-BAT burst
  23. GRB 060115: OT photometry with MITSuME
  24. GRB 060115: Swift/UVOT upper limits
  25. GRB 060115: Swift XRT refined analysis
  26. GRB 060115: OT finding chart
  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. GRB060114: Faulkes North observation
  32. GRB 060108: IR observations of afterglow
  33. GRB060108: Faulkes North afterglow evidence
  34. GRB 060108: further analysis of VLT images
  35. GRB 060108: Evidence for an XRT Position Offset
  36. GRB 060110: KAIT observations
  37. GRB 060111B: Swift XRT refined analysis
  38. GRB 060111A: refined UVOT anaysis
  39. GRB 060111B: MITSuME detection of optical afterglow
  40. GRB 060111B: TAROT optical observation
  41. GRB060111A: RTT150 optical observations
  42. GRB060111B: RTT150, possible host galaxy
  43. GRB 060111B: Refined analysis of the Swift-BAT burst
  44. GRB 060110: MARGE observations
  45. GRB 060111(a): P60 Observations
  46. GRB 060111B: Gualba observatory limit
  47. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  48. GRB 060111B: Swift detection of a burst
  49. GRB 060111: Swift-BAT Refined Analysis
  50. GRB 060108: VLT K-band observations
  51. GRB 060111: TAROT optical observation
  52. GRB 060111: possible UVOT counterpart
  53. GRB060111 : XRT refined analysis
  54. GRB 060111: ROTSE-III Optical Limits
  55. GRB 060111: Swift detection of a burst
  56. GRB 060110: Swift-BAT refined analysis
  57. GRB 060109: Swift-BAT refined analysis
  58. GRB 060108: z-band imaging from Gemini-North
  59. GRB 060110a: RAPTOR detection of early optical emission.
  60. GRB 060110: IR Candidate Afterglow
  61. GRB 060110: Optical observation
  62. GRB 060110: Correction
  63. Correction to GRB 060109 XRT analysis
  64. GRB 060110: Optical limit
  65. GRB 060110: Swift-BAT detection of a burst
  66. GRB 060109: Refined Swift-XRT analysis
  67. GRB 060109: Swift/UVOT upper limits
  68. GRB 060108: ISAS early observations and near IR upper limit
  69. GRB060108: P200 Ks Observations
  70. GRB 060108: early UKIRT K-band observations
  71. Swift UVOT correction to GCN 4455
  72. GRB 060109: Swift Detection of a long burst
  73. GRB 060108: a dark burst?
  74. GRB 060108: Refined XRT analysis
  75. GRB 060108: VLT J-band observations
  76. GRB 060108: Mitsume optical observations
  77. GRB 060108: Swift/UVOT upper limits
  78. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  79. GRB060108: Faulkes Telescope observation
  80. GRB 060108: Refined analysis of the Swift-BAT burst
  81. GRB 060108: Swift XRT position
  82. GRB060108: Swift detection of its 100th GRB
  83. GRB 060105: Radio observations
  84. GRB 060105: MDM Observation
  85. Konus-Wind observation of GRB 060105
  86. GRB 060105: ISAS observations and near IR upper limit
  87. GRB 060105: Swift/UVOT upper limits
  88. GRB 060105: Mitsume optical observations
  89. GRB 060105: BAT refined analysis
  90. GRB 060102 - no XRT afterglow
  91. GRB 060105: XRT refined analysis
  92. GRB060105 : Kiso optical observation
  93. GRB060105: Swift detection of a bright long burst
  94. Swift-BAT trigger 175653 is not an astrophysical source
  95. Swift-BAT trigger 175653 is probably not a GRB
  96. GRB 060102: Swift-BAT refined analysis
  97. Time Correction to GRB 060102
  98. GRB 060102: Swift-BAT detection of a burst
  99. GRB051211B: optical observations
  100. GRB051227: SARA Observations

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