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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"
  1. GRB 060117: Swift-BAT detection of a bright burst
  2. GRB 060116: VLT optical observations
  3. GRB 060116: Refined analysis of the Swift-BAT burst
  4. GRB 060115: PROMPT Observations
  5. GRB 060116: XRT refined analysis
  6. GRB 060116: IR Candidate Afterglow
  7. GRB 060116: Swift/UVOT upper limits
  8. GRB060115: REM observations
  9. GRB 060110: XRT position and analysis
  10. GRB 060116 : Lulin optical limit
  11. GRB 060116: ROTSE-III Optical Limits
  12. GRB060116: XRT position
  13. GRB060116: Faulkes North observation
  14. GRB 060115: absorption redshift
  15. GRB 060116: Swift-BAT detection of a burst
  16. GRB 060115: Refined analysis of the Swift-BAT burst
  17. GRB 060115: OT photometry with MITSuME
  18. GRB 060115: Swift/UVOT upper limits
  19. GRB 060114: REM observations
  20. GRB 060115: Swift XRT refined analysis
  21. GRB 060115: OT finding chart
  22. GRB 060114: Swift/UVOT Observations
  23. GRB060115, optical observation
  24. GRB 060115: MITSuME optical afterglow candidate
  25. GRB 060115: Swift detection of a burst
  26. GRB 060114: Swift XRT upper limit
  27. GRB060114, optical observation
  28. GRB 060114: refined position
  29. GRB 060114: A long GRB detected by INTEGRAL
  30. GRB060114: Faulkes North observation
  31. GRB 060108: IR observations of afterglow
  32. GRB060108: Faulkes North afterglow evidence
  33. GRB 060108: further analysis of VLT images
  34. GRB 060108: Evidence for an XRT Position Offset
  35. GRB 060110: KAIT observations
  36. GRB 060111B: Swift XRT refined analysis
  37. GRB 060111A: refined UVOT anaysis
  38. GRB 060111B: MITSuME detection of optical afterglow
  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 060111(a): P60 Observations
  45. GRB 060111B: Gualba observatory limit
  46. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  47. GRB 060111B: Swift detection of a burst
  48. GRB 060111: Swift-BAT Refined Analysis
  49. GRB060111.2:_MASTER optical limit
  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: Mitsume optical observations
  57. GRB 060110: Swift-BAT refined analysis
  58. GRB 060109: Swift-BAT refined analysis
  59. GRB 060108: z-band imaging from Gemini-North
  60. GRB 060110a: RAPTOR detection of early optical emission.
  61. GRB 060110: UKIRT K-band observations
  62. GRB 060110: ROTSE-III Confirmation of Optical Counterpart
  63. GRB 060110: IR Candidate Afterglow
  64. GRB060110, optical observation
  65. GRB 060110: Super-LOTIS observations
  66. GRB 060110: Optical observation
  67. GRB 060110: Correction
  68. Correction to GRB 060109 XRT analysis
  69. GRB 050110: IR Observations
  70. GRB 060110: Optical limit
  71. GRB 060110: Swift-BAT detection of a burst
  72. GRB 060109: Refined Swift-XRT analysis
  73. GRB 060109: Swift/UVOT upper limits
  74. GRB060109, optical observation
  75. GRB 060108: ISAS early observations and near IR upper limit
  76. GRB060108: P200 Ks Observations
  77. GRB 060108: early UKIRT K-band observations
  78. Swift UVOT correction to GCN 4455
  79. GRB 060109: Swift Detection of a long burst
  80. GRB 060108: a dark burst?
  81. GRB 060108: Refined XRT analysis
  82. GRB 060108: VLT J-band observations
  83. GRB 060108: Mitsume optical observations
  84. GRB 060108: Swift/UVOT upper limits
  85. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  86. GRB060108: SDSS pre-burst observations
  87. GRB060108: Faulkes Telescope observation
  88. GRB060108, optical observation
  89. GRB 060108: Refined analysis of the Swift-BAT burst
  90. GRB 060108: Swift XRT position
  91. GRB060108: Swift detection of its 100th GRB
  92. GRB 060105: pseudo-z from spectral parameters of the prompt emission
  93. GRB 060105: Radio observations
  94. GRB 060105: MDM Observation
  95. Konus-Wind observation of GRB 060105
  96. GRB 060105: ISAS observations and near IR upper limit
  97. GRB 060105: Swift/UVOT upper limits
  98. GRB 060105: Mitsume optical observations
  99. GRB 060105: BAT refined analysis
  100. GRB 060102 - no XRT afterglow

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