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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

19663 results found.

  1. GRB 061122: Confirmation of X-ray/Optical Afterglow
  2. GRB 061122: Candidate Optical Afterglow
  3. GRB 061121: Ep,i - Eiso correlation
  4. GRB061122: Swift/UVOT Optical Observations
  5. GRB061122: Swift-XRT position
  6. GRB 061121 declared "Burst of Interest" by Swift team
  7. Konus-Wind and Konus-A observations of GRB 061121
  8. Swift-BAT trigger 239987 is not a GRB
  9. GRB 061121: Swift/UVOT Observations
  10. GRB 061121: Swift-XRT Team Refined Analysis
  11. GRB 061121, Swift-BAT refined analysis
  12. GRB061121, optical observation
  13. GRB 061121: Faulkes Telescope North Optical Observation
  14. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  15. GRB 061121: Swift detection of a bright burst with an optical counterpart
  16. GRB 060111B: Swift UVOT Refined Magnitudes
  17. Swift-BAT triggers 238544 and 238546 are not GRBs
  18. Swift TOO observations of GRB061110A
  19. Swift/UVOT Upper Limits for GRB061110b
  20. Swift/UVOT Upper Limits for GRB061110a
  21. GRB 061110B: Swift XRT refined analysis
  22. GRB 061110B, Swift-BAT refined analysis
  23. GRB061110B: Optical observations at Crni Vrh
  24. GRB 061110A: Swift XRT refined analysis
  25. GRB 061110B: Swift/XRT position
  26. GRB 061110B: Swift-UVOT Initial Observation
  27. GRB 061110A, Swift-BAT refined analysis
  28. GRB 061110B: TAROT Calern observatory optical observations
  29. GRB 061110B: Swift detection of a burst
  30. GRB 061110: ROTSE-III Optical Limits
  31. GRB 061110: Swift detection of a burst
  32. Swift-BAT Trigger 237821 is a Cosmic Ray Shower event
  33. GRB 061109: TAROT Calern observatory optical observations
  34. GRB 061109: Swift detection of a possible burst
  35. GRB061028: MAGIC telescope GeV observation
  36. GRB 061027: TAROT La Silla observatory optical observations
  37. GRB 061028: Swift/XRT Astrometry Correction
  38. GRB 061102: Swift/UVOT Magnitude Upper Limits
  39. GRB 061102, XRT refined analysis
  40. Swift-BAT Trigger 236481 is a Cosmic Ray Shower event
  41. GRB061102B: Super-LOTIS observations
  42. GRB 061028: Optical R passband observations
  43. GRB 061102B: Swift detection of a possible burst
  44. GRB 061102, Swift-BAT refined analysis
  45. GRB 061102: Swift detection of a burst
  46. GRB 061028: VLA Observation
  47. GRB 061004: Swift/XRT Astrometry Correction
  48. GRB 060801: Swift/XRT Astrometry Correction
  49. GRB 061028: MDM Observations
  50. GRB 061028: SARA upper limit
  51. GRB061028: XRT refined analysis
  52. GRB 061028: Swift/UVOT Observations
  53. GRB 061028, Swift-BAT refined analysis
  54. GRB 061028: TAROT Calern observatory optical observations
  55. GRB 061028: Swift detection of a burst
  56. GRB 061027, Swift refined analysis of a possible burst
  57. GRB 061027: Swift detection of a possible burst
  58. GRB061025: Swift XRT refined analysis
  59. GRB061025: Swift/UVOT observations
  60. GRB061025: Swift XRT position
  61. Swift XRT boresight update
  62. GRB 061021, Swift-BAT Lag analysis
  63. Konus-Wind observation of GRB 061021
  64. GRB 061021: Swift-XRT refined analysis
  65. GRB 061021: Swift/UVOT Observation
  66. GRB 061021, Swift-BAT refined analysis
  67. GRB 061021: Swift detection of a burst
  68. GRB 061019: Super-LOTIS upper limit
  69. GRB 061019: SARA upper limit
  70. GRB 061019: dust-scattered X-ray halo detected in Swift/XRT
  71. GRB 061019: Swift/UVOT upper limit
  72. GRB061019: Swift XRT refined analysis
  73. GRB 061019, Swift-BAT refined analysis
  74. GRB 061019: TAROT La Silla observatory optical observations
  75. GRB061019: Swift/XRT position
  76. GRB 061019: Swift-BAT detection of a burst
  77. GRB 061006: astrometry-corrected XRT position
  78. Konus-Wind observation of GRB 061007
  79. GRB 060928: Confirmation of the X-ray afterglow detected by Swift
  80. GRB061007: Swift UVOT followup observations
  81. GRB 061007: Magellan Spectroscopy
  82. GRB 061007: Correction to GCN 5712
  83. GRB 061007: Swift-BAT refined analysis
  84. GRB 061007: Swift XRT refined analysis
  85. GRB 061006: Swift/UVOT optical observations
  86. Konus-Wind observation of the short hard GRB 061006
  87. GRB 061007 - Faulkes Telescope South Afterglow Confirmation
  88. GRB 061007: Swift detection of a burst with an optical counterpart
  89. GRB 061007: ROTSE-III Detection of Optical Counterpart
  90. GRB 061006: Swift-BAT refined analysis of the short-hard burst
  91. GRB 061006: Swift-XRT Team Refined Analysis
  92. GRB061006 (Swift 232585) might be a short-hard GRB
  93. GRB061006: Faulkes Telescope South Observations
  94. GRB 061006: Swift detection of a burst
  95. GRB061004: Swift/UVOT optical observations
  96. GRB 061004: Swift-XRT Team Refined Analysis
  97. GRB 061004, Swift BAT refined analysis
  98. GRB 061004: Swift detection of a burst
  99. IGR J08408-4503 (= V* LM Vel): Swift detection of a transient
  100. GRB 060928: Swift observations

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