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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"

19366 results found.

  1. GRB 061126: Swift/UVOT Afterglow Detection
  2. GRB 061126: XRT position
  3. GRB 061126: Swift detection of a burst
  4. GRB 061122: Confirmation of X-ray/Optical Afterglow
  5. GRB 061122: Candidate Optical Afterglow
  6. GRB 061121: Ep,i - Eiso correlation
  7. GRB061122: Swift/UVOT Optical Observations
  8. GRB061122: Swift-XRT position
  9. GRB 061121 declared "Burst of Interest" by Swift team
  10. Konus-Wind and Konus-A observations of GRB 061121
  11. Swift-BAT trigger 239987 is not a GRB
  12. GRB 061121: Swift/UVOT Observations
  13. GRB 061121: Swift-XRT Team Refined Analysis
  14. GRB 061121, Swift-BAT refined analysis
  15. GRB061121, optical observation
  16. GRB 061121: Faulkes Telescope North Optical Observation
  17. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  18. GRB 061121: Swift detection of a bright burst with an optical counterpart
  19. GRB 060111B: Swift UVOT Refined Magnitudes
  20. Swift-BAT triggers 238544 and 238546 are not GRBs
  21. Swift TOO observations of GRB061110A
  22. Swift/UVOT Upper Limits for GRB061110b
  23. Swift/UVOT Upper Limits for GRB061110a
  24. GRB 061110B: Swift XRT refined analysis
  25. GRB 061110B, Swift-BAT refined analysis
  26. GRB061110B: Optical observations at Crni Vrh
  27. GRB 061110A: Swift XRT refined analysis
  28. GRB 061110B: Swift/XRT position
  29. GRB 061110B: Swift-UVOT Initial Observation
  30. GRB 061110A, Swift-BAT refined analysis
  31. GRB 061110B: TAROT Calern observatory optical observations
  32. GRB 061110B: Swift detection of a burst
  33. GRB 061110: ROTSE-III Optical Limits
  34. GRB 061110: Swift detection of a burst
  35. Swift-BAT Trigger 237821 is a Cosmic Ray Shower event
  36. GRB 061109: TAROT Calern observatory optical observations
  37. GRB 061109: Swift detection of a possible burst
  38. GRB061028: MAGIC telescope GeV observation
  39. GRB 061027: TAROT La Silla observatory optical observations
  40. GRB 061028: Swift/XRT Astrometry Correction
  41. GRB 061102: Swift/UVOT Magnitude Upper Limits
  42. GRB 061102, XRT refined analysis
  43. Swift-BAT Trigger 236481 is a Cosmic Ray Shower event
  44. GRB061102B: Super-LOTIS observations
  45. GRB 061028: Optical R passband observations
  46. GRB 061102B: Swift detection of a possible burst
  47. GRB 061102, Swift-BAT refined analysis
  48. GRB 061102: Swift detection of a burst
  49. GRB 061028: VLA Observation
  50. GRB 061004: Swift/XRT Astrometry Correction
  51. GRB 060801: Swift/XRT Astrometry Correction
  52. GRB 061028: MDM Observations
  53. GRB 061028: SARA upper limit
  54. GRB061028: XRT refined analysis
  55. GRB 061028: Swift/UVOT Observations
  56. GRB 061028, Swift-BAT refined analysis
  57. GRB 061028: TAROT Calern observatory optical observations
  58. GRB 061028: Swift detection of a burst
  59. GRB 061027, Swift refined analysis of a possible burst
  60. GRB 061027: Swift detection of a possible burst
  61. GRB061025: Swift XRT refined analysis
  62. GRB061025: Swift/UVOT observations
  63. GRB061025: Swift XRT position
  64. Swift XRT boresight update
  65. GRB 061021, Swift-BAT Lag analysis
  66. Konus-Wind observation of GRB 061021
  67. GRB 061021: Swift-XRT refined analysis
  68. GRB 061021: Swift/UVOT Observation
  69. GRB 061021, Swift-BAT refined analysis
  70. GRB 061021: Swift detection of a burst
  71. GRB 061019: Super-LOTIS upper limit
  72. GRB 061019: SARA upper limit
  73. GRB 061019: dust-scattered X-ray halo detected in Swift/XRT
  74. GRB 061019: Swift/UVOT upper limit
  75. GRB061019: Swift XRT refined analysis
  76. GRB 061019, Swift-BAT refined analysis
  77. GRB 061019: TAROT La Silla observatory optical observations
  78. GRB061019: Swift/XRT position
  79. GRB 061019: Swift-BAT detection of a burst
  80. GRB 061006: astrometry-corrected XRT position
  81. Konus-Wind observation of GRB 061007
  82. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  83. GRB061007: Swift UVOT followup observations
  84. GRB 061007: Magellan Spectroscopy
  85. GRB 061007: Correction to GCN 5712
  86. GRB 061007: Swift-BAT refined analysis
  87. GRB 061007: Swift XRT refined analysis
  88. GRB 061006: Swift/UVOT optical observations
  89. Konus-Wind observation of the short hard GRB 061006
  90. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  91. GRB 061007: Swift detection of a burst with an optical counterpart
  92. GRB 061007: ROTSE-III Detection of Optical Counterpart
  93. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  94. GRB 061006: Swift-XRT Team Refined Analysis
  95. GRB061006 (Swift 232585) might be a short-hard GRB
  96. GRB061006: Faulkes Telescope South Observations
  97. GRB 061006: Swift detection of a burst
  98. GRB061004: Swift/UVOT optical observations
  99. GRB 061004: Swift-XRT Team Refined Analysis
  100. GRB 061004, Swift BAT refined analysis

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