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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"

26507 results found.

  1. GRB 060110: XRT position and analysis
  2. GRB 060116 : Lulin optical limit
  3. GRB060116: Faulkes North observation
  4. GRB 060116: Swift-BAT detection of a burst
  5. GRB 060115: Refined analysis of the Swift-BAT burst
  6. GRB 060115: Swift/UVOT upper limits
  7. GRB 060114: REM observations
  8. GRB 060115: Swift XRT refined analysis
  9. GRB 060114: Swift/UVOT Observations
  10. GRB060115, optical observation
  11. GRB 060115: MITSuME optical afterglow candidate
  12. GRB 060115: Swift detection of a burst
  13. GRB060114, optical observation
  14. GRB060114: Faulkes North observation
  15. GRB 060108: IR observations of afterglow
  16. GRB 060108: Evidence for an XRT Position Offset
  17. GRB 060110: KAIT observations
  18. GRB 060111B: Swift XRT refined analysis
  19. GRB 060111B: MITSuME detection of optical afterglow
  20. GRB 060111B: TAROT optical observation
  21. GRB060111A: RTT150 optical observations
  22. GRB060111B: RTT150, possible host galaxy
  23. GRB 060111B: Refined analysis of the Swift-BAT burst
  24. GRB 060111(a): P60 Observations
  25. GRB 060111B: Gualba observatory limit
  26. GRB 060111B: Swift detection of a burst
  27. GRB 060111: Swift-BAT Refined Analysis
  28. GRB060111.2:_MASTER optical limit
  29. GRB 060108: VLT K-band observations
  30. GRB 060111: TAROT optical observation
  31. GRB 060111: Swift detection of a burst
  32. GRB 060110: Mitsume optical observations
  33. GRB 060110: Swift-BAT refined analysis
  34. GRB 060109: Swift-BAT refined analysis
  35. GRB 060108: z-band imaging from Gemini-North
  36. GRB 060110a: RAPTOR detection of early optical emission.
  37. GRB 060110: UKIRT K-band observations
  38. GRB 060110: IR Candidate Afterglow
  39. GRB060110, optical observation
  40. GRB 060110: Correction
  41. Correction to GRB 060109 XRT analysis
  42. GRB 050110: IR Observations
  43. GRB 060109: Refined Swift-XRT analysis
  44. GRB 060109: Swift/UVOT upper limits
  45. GRB060109, optical observation
  46. GRB 060108: ISAS early observations and near IR upper limit
  47. GRB060108: P200 Ks Observations
  48. GRB 060108: early UKIRT K-band observations
  49. GRB 060108: a dark burst?
  50. GRB 060108: Refined XRT analysis
  51. GRB 060108: VLT J-band observations
  52. GRB 060108: Mitsume optical observations
  53. GRB 060108: Swift/UVOT upper limits
  54. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  55. GRB060108: SDSS pre-burst observations
  56. GRB060108: Faulkes Telescope observation
  57. GRB060108, optical observation
  58. GRB 060108: Refined analysis of the Swift-BAT burst
  59. GRB060108: Swift detection of its 100th GRB
  60. GRB 060105: ISAS observations and near IR upper limit
  61. GRB 060105: Swift/UVOT upper limits
  62. GRB 060105: Mitsume optical observations
  63. GRB 060105: BAT refined analysis
  64. GRB 060105: XRT refined analysis
  65. GRB060105: Suzaku-XIS and -HXD observation plan
  66. GRB060105, optical observation
  67. GRB060105: Swift detection of a bright long burst
  68. Swift-BAT trigger 175653 is probably not a GRB
  69. GRB 060102: Swift-BAT refined analysis
  70. GRB 060102: Swift-BAT detection of a burst
  71. GRB 051221B: Optical Observations with Kuiper 1.54m
  72. GRB 051227: Likely host galaxy underlying afterglow position
  73. GRB 051227: optical observation
  74. GRB 051227: optical afterglow
  75. GRB 051227: Magellan r'-band Imaging/Astrometry
  76. GRB 051227: refined analysis of VLT images
  77. GRB 051227: P60 Observations
  78. GRB 051227: MDM Observation
  79. GRB 051227: R-band object in the XRT error circle
  80. GRB 051227: XRT refined analysis
  81. GRB 051227: Further analysis of the Swift-BAT burst
  82. GRB 051227: Refined analysis of the Swift-BAT burst
  83. GRB051227: SDSS pre-burst observations
  84. GRB 051227, optical observation
  85. GRB051117B: optical observation
  86. Konus-Wind observation of GRB 051221A
  87. GRB051221A: Suzaku WAM observation of the prompt emission
  88. GRB 051221A: MDM Optical Observations
  89. GRB051016: analysis of the XMM-Newton observation
  90. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  91. GRB 051221B: TAROT optical limits
  92. GRB 051221B: Refined analysis of the Swift-BAT burst
  93. GRB 051221B: BOOTES optical observations.
  94. Swift-BAT detection of a possible burst
  95. GRB 051221: Swift XRT refined analysis
  96. GRB 051221: Swift/UVOT upper limits
  97. GRB 051221: No variability in Gemini data
  98. GRB 051221: Improved astrometry of the IR counterpart
  99. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  100. GRB 051221: Swift detection of a bright short burst

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