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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"

36401 results found.

  1. GRB 061126: Swift/UVOT Afterglow Detection
  2. GRB 061126: XRT position
  3. GRB 061126: Swift detection of a burst
  4. GRB 061121: MDM Continued Monitoring
  5. GRB 061122: Confirmation of X-ray/Optical Afterglow
  6. GRB 061121: MDM Continuing Optical Decay
  7. GRB061121: optical observations
  8. GRB 061122: Candidate Optical Afterglow
  9. GRB 061121: Ep,i - Eiso correlation
  10. GRB 061121: MDM Optical Decay
  11. GRB061122: Swift/UVOT Optical Observations
  12. GRB 061121: ART detection in Ic
  13. GRB061121: P60 Observations
  14. Radio detection of GRB 061121
  15. GRB061122: Swift-XRT position
  16. Konus-Wind observation of GRB 061122
  17. GRB 061121: MDM Optical Observations
  18. GRB 061121 declared "Burst of Interest" by Swift team
  19. Konus-Wind and Konus-A observations of GRB 061121
  20. INTEGRAL results on GRB 061122
  21. Swift-BAT trigger 239987 is not a GRB
  22. GRB 061122A: a long GRB detected by INTEGRAL
  23. GRB 061121: Swift/UVOT Observations
  24. GRB 061121: Swift-XRT Team Refined Analysis
  25. GRB 061121, Swift-BAT refined analysis
  26. GRB 061121 : Planned XMM-Newton observation
  27. GRB 061121: Optical observation at the KANATA 1.5m telescope
  28. GRB 061121: Faulkes Telescope North Optical Observation
  29. GRB061121: Spectroscopic Redshift
  30. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  31. GRB 061121: Swift detection of a bright burst with an optical counterpart
  32. GRB 060605: NIR Observations
  33. GRB 050915B: optical afterglow
  34. GRB 060111B: Swift UVOT Refined Magnitudes
  35. GRB061110A: Correction to GCN5817
  36. GRB 061110A: refined R-band analysis
  37. GRB 061110B: NIR Observations
  38. Swift TOO observations of GRB061110A
  39. Swift/UVOT Upper Limits for GRB061110b
  40. Swift/UVOT Upper Limits for GRB061110a
  41. GRB 061110A - VLT tentative redshift
  42. GRB 061110B: Swift XRT refined analysis
  43. GRB 061110B, Swift-BAT refined analysis
  44. GRB 061110B: VLT redshift
  45. GRB061110B: Optical observations at Crni Vrh
  46. GRB 061110B: NOT optical observations
  47. GRB 061110A: Swift XRT refined analysis
  48. GRB 061110B: Swift/XRT position
  49. GRB 061110B : Liverpool Telescope Optical Afterglow Detection
  50. GRB 061110B: Swift-UVOT Initial Observation
  51. GRB 061110A, Swift-BAT refined analysis
  52. GRB 061110B: TAROT Calern observatory optical observations
  53. GRB 061110B: Swift detection of a burst
  54. GRB 061110: NOT observations
  55. GRB 061110: Candidate confirmed
  56. GRB 061110 : Optical afterglow candidate
  57. GRB 061110: ROTSE-III Optical Limits
  58. GRB 061110: Swift detection of a burst
  59. Swift-BAT Trigger 237821 is a Cosmic Ray Shower event
  60. GRB 061109: optical observation
  61. GRB 061109: TAROT Calern observatory optical observations
  62. GRB 061109: Swift detection of a possible burst
  63. GRB061028: MAGIC telescope GeV observation
  64. GRB 061027: TAROT La Silla observatory optical observations
  65. GRB 061007: Third Epoch ATCA Radio Observations
  66. GRB061019: second epoch CrAO observations
  67. GRB 061028: Swift/XRT Astrometry Correction
  68. GRB 061102: Swift/UVOT Magnitude Upper Limits
  69. GRB 061102, XRT refined analysis
  70. GRB 061004: Further VLT/NTT observations
  71. Swift-BAT Trigger 236481 is a Cosmic Ray Shower event
  72. GRB061102B: Super-LOTIS observations
  73. GRB 061028: Optical R passband observations
  74. GRB 061102B: Swift detection of a possible burst
  75. GRB 061102, Swift-BAT refined analysis
  76. GRB 061102: Swift detection of a burst
  77. GRB 061028: VLA Observation
  78. GRB 061004: Swift/XRT Astrometry Correction
  79. GRB 060801: Swift/XRT Astrometry Correction
  80. GRB 061028: Futher P200 Observations
  81. GRB 061028: MDM Observations
  82. GRB 061028: P200 Observations
  83. GRB 061028: SARA upper limit
  84. GRB 061028: z band imaging
  85. GRB061028: XRT refined analysis
  86. GRB 061028: Swift/UVOT Observations
  87. GRB 061028, Swift-BAT refined analysis
  88. GRB 061028: TAROT Calern observatory late optical observations
  89. GRB 061028: TAROT Calern observatory optical observations
  90. GRB 061028: Swift detection of a burst
  91. GRB 061027, Swift refined analysis of a possible burst
  92. GRB 061027: Swift detection of a possible burst
  93. GRB061025: Swift/UVOT observations
  94. GRB 061019: MITSuME upper limits
  95. GRB 061025: REM observations
  96. GRB 061025: Gemini-S observations
  97. GRB061025: Swift XRT position
  98. GRB 061025: ROTSE-III Optical Limits
  99. GRB 061025: a long GRB detected by INTEGRAL
  100. GRB 061021, Swift-BAT Lag analysis

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