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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"

37675 results found.

  1. Swift-BAT trigger 239987 is not a GRB
  2. GRB 061122A: a long GRB detected by INTEGRAL
  3. GRB 061121: Swift/UVOT Observations
  4. GRB 061121: Swift-XRT Team Refined Analysis
  5. GRB 061121, Swift-BAT refined analysis
  6. GRB 061121 : Planned XMM-Newton observation
  7. GRB 061121: Optical observation at the KANATA 1.5m telescope
  8. GRB 061121: Faulkes Telescope North Optical Observation
  9. GRB061121: Spectroscopic Redshift
  10. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  11. GRB 061121: Swift detection of a bright burst with an optical counterpart
  12. GRB 060605: NIR Observations
  13. GRB 050915B: optical afterglow
  14. GRB 060111B: Swift UVOT Refined Magnitudes
  15. GRB061110A: Correction to GCN5817
  16. GRB 061110A: refined R-band analysis
  17. GRB 061110B: NIR Observations
  18. Swift TOO observations of GRB061110A
  19. Swift/UVOT Upper Limits for GRB061110b
  20. Swift/UVOT Upper Limits for GRB061110a
  21. GRB 061110A - VLT tentative redshift
  22. GRB 061110B: Swift XRT refined analysis
  23. GRB 061110B, Swift-BAT refined analysis
  24. GRB 061110B: VLT redshift
  25. GRB061110B: Optical observations at Crni Vrh
  26. GRB 061110B: NOT optical observations
  27. GRB 061110A: Swift XRT refined analysis
  28. GRB 061110B: Swift/XRT position
  29. GRB 061110B : Liverpool Telescope Optical Afterglow Detection
  30. GRB 061110B: Swift-UVOT Initial Observation
  31. GRB 061110A, Swift-BAT refined analysis
  32. GRB 061110B: TAROT Calern observatory optical observations
  33. GRB 061110B: Swift detection of a burst
  34. GRB 061110: NOT observations
  35. GRB 061110: Candidate confirmed
  36. GRB 061110 : Optical afterglow candidate
  37. GRB 061110: ROTSE-III Optical Limits
  38. GRB 061110: Swift detection of a burst
  39. Swift-BAT Trigger 237821 is a Cosmic Ray Shower event
  40. GRB 061109: optical observation
  41. GRB 061109: TAROT Calern observatory optical observations
  42. GRB 061109: Swift detection of a possible burst
  43. GRB061028: MAGIC telescope GeV observation
  44. GRB 061027: TAROT La Silla observatory optical observations
  45. GRB 061007: Third Epoch ATCA Radio Observations
  46. GRB061019: second epoch CrAO observations
  47. GRB 061028: Swift/XRT Astrometry Correction
  48. GRB 061102: Swift/UVOT Magnitude Upper Limits
  49. GRB 061102, XRT refined analysis
  50. GRB 061004: Further VLT/NTT observations
  51. Swift-BAT Trigger 236481 is a Cosmic Ray Shower event
  52. GRB061102B: Super-LOTIS observations
  53. GRB 061028: Optical R passband observations
  54. GRB 061102B: Swift detection of a possible burst
  55. GRB 061102, Swift-BAT refined analysis
  56. GRB 061102: Swift detection of a burst
  57. GRB 061028: VLA Observation
  58. GRB 061004: Swift/XRT Astrometry Correction
  59. GRB 060801: Swift/XRT Astrometry Correction
  60. GRB 061028: Futher P200 Observations
  61. GRB 061028: MDM Observations
  62. GRB 061028: P200 Observations
  63. GRB 061028: SARA upper limit
  64. GRB 061028: z band imaging
  65. GRB061028: XRT refined analysis
  66. GRB 061028: Swift/UVOT Observations
  67. GRB 061028, Swift-BAT refined analysis
  68. GRB 061028: TAROT Calern observatory late optical observations
  69. GRB 061028: TAROT Calern observatory optical observations
  70. GRB 061028: Swift detection of a burst
  71. GRB 061027, Swift refined analysis of a possible burst
  72. GRB 061027: Swift detection of a possible burst
  73. GRB061025: Swift/UVOT observations
  74. GRB 061019: MITSuME upper limits
  75. GRB 061025: REM observations
  76. GRB 061025: Gemini-S observations
  77. GRB061025: Swift XRT position
  78. GRB 061025: ROTSE-III Optical Limits
  79. GRB 061025: a long GRB detected by INTEGRAL
  80. GRB 061021, Swift-BAT Lag analysis
  81. Konus-Wind observation of GRB 061021
  82. GRB 061021 - VLT spectrum without lines
  83. GRB 061021: Swift-XRT refined analysis
  84. GRB 061021: Swift/UVOT Observation
  85. GRB 061021, Swift-BAT refined analysis
  86. GRB 061021: Swift detection of a burst
  87. GRB 061019: Super-LOTIS upper limit
  88. GRB060904b: optical observations
  89. GRB061019: optical observations
  90. GRB061019: optical observations
  91. GRB 061019: SARA upper limit
  92. GRB 061019: dust-scattered X-ray halo detected in Swift/XRT
  93. GRB 060930: MARGE Optical Limits
  94. GRB 061019: Swift/UVOT upper limit
  95. GRB 061019: SMARTS afterglow confirmation
  96. GRB061019: Swift XRT refined analysis
  97. GRB 061019, Swift-BAT refined analysis
  98. GRB 061019: TAROT La Silla observatory optical observations
  99. GRB 061019: REM K-band candidate afterglow
  100. GRB061019: Swift/XRT position

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