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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"

37159 results found.

  1. GRB 061122: Candidate Optical Afterglow
  2. GRB 061121: Ep,i - Eiso correlation
  3. GRB 061121: MDM Optical Decay
  4. GRB061122: Swift/UVOT Optical Observations
  5. GRB 061121: ART detection in Ic
  6. GRB061121: P60 Observations
  7. Radio detection of GRB 061121
  8. GRB061122: Swift-XRT position
  9. Konus-Wind observation of GRB 061122
  10. GRB 061121: MDM Optical Observations
  11. GRB 061121 declared "Burst of Interest" by Swift team
  12. Konus-Wind and Konus-A observations of GRB 061121
  13. INTEGRAL results on GRB 061122
  14. Swift-BAT trigger 239987 is not a GRB
  15. GRB 061122A: a long GRB detected by INTEGRAL
  16. GRB 061121: Swift/UVOT Observations
  17. GRB 061121: Swift-XRT Team Refined Analysis
  18. GRB 061121, Swift-BAT refined analysis
  19. GRB 061121 : Planned XMM-Newton observation
  20. GRB 061121: Optical observation at the KANATA 1.5m telescope
  21. GRB 061121: Faulkes Telescope North Optical Observation
  22. GRB061121: Spectroscopic Redshift
  23. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  24. GRB 061121: Swift detection of a bright burst with an optical counterpart
  25. GRB 060605: NIR Observations
  26. GRB 050915B: optical afterglow
  27. GRB 060111B: Swift UVOT Refined Magnitudes
  28. GRB061110A: Correction to GCN5817
  29. GRB 061110A: refined R-band analysis
  30. GRB 061110B: NIR Observations
  31. Swift TOO observations of GRB061110A
  32. Swift/UVOT Upper Limits for GRB061110b
  33. Swift/UVOT Upper Limits for GRB061110a
  34. GRB 061110A - VLT tentative redshift
  35. GRB 061110B: Swift XRT refined analysis
  36. GRB 061110B, Swift-BAT refined analysis
  37. GRB 061110B: VLT redshift
  38. GRB061110B: Optical observations at Crni Vrh
  39. GRB 061110B: NOT optical observations
  40. GRB 061110A: Swift XRT refined analysis
  41. GRB 061110B: Swift/XRT position
  42. GRB 061110B : Liverpool Telescope Optical Afterglow Detection
  43. GRB 061110B: Swift-UVOT Initial Observation
  44. GRB 061110A, Swift-BAT refined analysis
  45. GRB 061110B: TAROT Calern observatory optical observations
  46. GRB 061110B: Swift detection of a burst
  47. GRB 061110: NOT observations
  48. GRB 061110: Candidate confirmed
  49. GRB 061110 : Optical afterglow candidate
  50. GRB 061110: ROTSE-III Optical Limits
  51. GRB 061110: Swift detection of a burst
  52. Swift-BAT Trigger 237821 is a Cosmic Ray Shower event
  53. GRB 061109: optical observation
  54. GRB 061109: TAROT Calern observatory optical observations
  55. GRB 061109: Swift detection of a possible burst
  56. GRB061028: MAGIC telescope GeV observation
  57. GRB 061027: TAROT La Silla observatory optical observations
  58. GRB 061007: Third Epoch ATCA Radio Observations
  59. GRB061019: second epoch CrAO observations
  60. GRB 061028: Swift/XRT Astrometry Correction
  61. GRB 061102: Swift/UVOT Magnitude Upper Limits
  62. GRB 061102, XRT refined analysis
  63. GRB 061004: Further VLT/NTT observations
  64. Swift-BAT Trigger 236481 is a Cosmic Ray Shower event
  65. GRB061102B: Super-LOTIS observations
  66. GRB 061028: Optical R passband observations
  67. GRB 061102B: Swift detection of a possible burst
  68. GRB 061102, Swift-BAT refined analysis
  69. GRB 061102: Swift detection of a burst
  70. GRB 061028: VLA Observation
  71. GRB 061004: Swift/XRT Astrometry Correction
  72. GRB 060801: Swift/XRT Astrometry Correction
  73. GRB 061028: Futher P200 Observations
  74. GRB 061028: MDM Observations
  75. GRB 061028: P200 Observations
  76. GRB 061028: SARA upper limit
  77. GRB 061028: z band imaging
  78. GRB061028: XRT refined analysis
  79. GRB 061028: Swift/UVOT Observations
  80. GRB 061028, Swift-BAT refined analysis
  81. GRB 061028: TAROT Calern observatory late optical observations
  82. GRB 061028: TAROT Calern observatory optical observations
  83. GRB 061028: Swift detection of a burst
  84. GRB 061027, Swift refined analysis of a possible burst
  85. GRB 061027: Swift detection of a possible burst
  86. GRB061025: Swift XRT refined analysis
  87. GRB061025: Swift/UVOT observations
  88. GRB 061019: MITSuME upper limits
  89. GRB 061025: REM observations
  90. GRB 061025: Gemini-S observations
  91. GRB061025: Swift XRT position
  92. GRB 061025: ROTSE-III Optical Limits
  93. GRB 061025: a long GRB detected by INTEGRAL
  94. GRB 061021, Swift-BAT Lag analysis
  95. Konus-Wind observation of GRB 061021
  96. GRB 061021 - VLT spectrum without lines
  97. GRB 061021: Swift-XRT refined analysis
  98. GRB 061021: Swift/UVOT Observation
  99. GRB 061021, Swift-BAT refined analysis
  100. GRB 061021: Swift detection of a burst

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