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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"

19412 results found.

  1. GRB 060607B: Swift detection of a burst
  2. GCN 060607: Swift-UVOT obswervations.
  3. GRB 060607: Swift-BAT Refined Analysis
  4. GRB 060607: optical limit by "Pi of the Sky"
  5. GRB 060607: Swift-XRT Team refined analysis
  6. VLT/UVES observations of GRB 060607
  7. GRB 060605: RTT150 optical observations
  8. GRB 060607: Swift detection of a burst with bright optical counterpart
  9. GRB 060605 BAT refined analysis
  10. GRB060605: Swift/UVOT detections
  11. GRB 060605: Swift-XRT Team refined analysis
  12. GRB 060605: RTT150 optical observations
  13. GRB 060605: ROTSE-III Optical Counterpart
  14. GRB 060605: Swift detection of a burst with optical counterpart
  15. GRB 060605: ROTSE-III Detection of Optical Counterpart
  16. GRB060604: Swift/UVOT detections
  17. GRB 060604: redshift
  18. GRB 060604 optical photometry
  19. GRB 060604: Swift-XRT Team refined analysis
  20. GRB 060604: BAT refined analysis
  21. GRB 060604A: ROTSE-III Optical Limits
  22. GRB 060604: Swift detection of a burst with possible optical counterpart
  23. GRB 060602A: Swift-BAT Refined Analysis: Correction
  24. GRB 060602B: XMM-Newton Survey Source
  25. GRB 060602B: Swift-XRT Refined Analysis
  26. GRB 060602B: Swift-BAT Refined Analysis
  27. GRB 060602B: Swift/UVOT observations
  28. GRB 060602A: Swift-BAT Refined Analysis
  29. GRB 060602B: RTT150 optical observations
  30. GRB 060602B: Swift detection of a burst
  31. GRB060602 - SDSS Pre-Burst Observations
  32. GRB 060602: Swift detection of a burst
  33. GRB 060526: Break in X-ray light curve
  34. GRB 051227 : WIDGET simultaneous optical observations
  35. GRB 060526: Multiple Optical Flares
  36. GRB060502b: optical observations
  37. GRB 060526: Optical Flare
  38. GRB 060526: Refined analysis of the Swift-BAT burst
  39. GRB 060526: RTT150 optical observations
  40. GRB060526: Further Swift-UVOT Observations
  41. GRB 060526: Swift/XRT Team refined analysis
  42. GRB 060526: ROTSE-III Observations of Optical Counterpart
  43. GRB 060526: Watcher Observations
  44. GRB 060526: Continued emission for the Swift burst
  45. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  46. GRB 060413 : WIDGET simultaneous optical observations
  47. GRB 060522: Swift/UVOT Observations: Correction
  48. GRB 060522: Swift/UVOT Observations of the Optical Afterglow
  49. XMM-Newton observation of GRB060510b
  50. GRB 060522: Swift/XRT Team refined analysis
  51. GRB 060522: Swift-BAT Refined Analysis
  52. GRB 060522: Swift detection of a burst with possible optical afterglow
  53. GRB 060210: Jet Break in the XRT light curve
  54. GRB 060516: Refined analysis of the Swift-BAT burst
  55. GRB 060516: Swift detection of a burst
  56. GRB 060505 BAT refined analysis
  57. GRB 060515 BAT refined analysis
  58. GRB 060512: TAROT optical observation
  59. GRB 060515: Swift/XRT Team refined analysis
  60. GRB 060515: Swift/UVOT Upper Limits
  61. GRB 060515: Swift/XRT position
  62. GRB 060515: Super-LOTIS Observations
  63. GRB060515: Swift/UVOT initial observation
  64. GRB 060515: TAROT optical observation
  65. GRB 060515: ROTSE-III Optical Limits
  66. GRB 060515: Swift detection of a burst
  67. Swift/UVOT observations of GRB060512.
  68. GRB060512: Swift XRT Team refined analysis
  69. GRB 060512: Detection of NIR afterglow
  70. GRB 060512: Swift-BAT Refined Analysis
  71. GRB060512 Name Correction: LT Afterglow detection
  72. GRB060512: Liverpool Telescope Afterglow detection
  73. GRB 060512: Swift detection of a burst with an optical afterglow
  74. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  75. GRB 060505: X-ray afterglow - Correction -
  76. GRB 060505: X-ray afterglow
  77. Konus-Wind observation of GRB 060510A
  78. GRB 060428a, SMARTS optical/IR afterglow detection
  79. GRB060510B: Swift XRT refined analysis
  80. GRB 060510B: Swift/UVOT Upper Limits
  81. GRB 060510A: Refined analysis of the Swift-BAT burst
  82. GRB 060510B: Swift-BAT Refined Analysis
  83. GRB060510A: XRT refined analysis
  84. GRB 060510B: Super-LOTIS Observations
  85. GRB 060510B: MDM Observations and candidate OT
  86. GRB 060510B: Swift detection of a burst
  87. GRB 060510: Swift detection of a burst with optical transient
  88. GRB060502B: improvement in the XRT afterglow position
  89. GRB 060507: BART limit
  90. GRB 060507: Final Refined analysis of the Swift-BAT burst
  91. GRB 060507: Swift-BAT Refined Analysis
  92. GRB 060507: Swift/UVOT Upper Limits
  93. GRB 060507: Swift XRT Team Refined Analysis
  94. GRB 060507: MDM Optical Upper Limit
  95. GRB060507: Swift XRT position
  96. GRB 060507: Swift detection of a burst
  97. GRB060505: Swift/UVOT Observations
  98. GRB 060505: Swift XRT Team Refined Analysis
  99. GRB 060505: Swift XRT afterglow canditate position
  100. GRB 060505: Swift-BAT detection of a weak burst

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