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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"

36115 results found.

  1. GRB 061201: Coincidence with a Galaxy Cluster
  2. GRB 061122: GETS observation
  3. GRB 061121, SMARTS optical/IR observations
  4. GRB 061121: flattening of the decay
  5. INT+WFC observations of GRB 061126
  6. GRB 061126: Possible Jet Break
  7. GRB 061121: Second Epoch ATCA Radio Observations
  8. GRB 061126: RAPTOR Optical Detection During Gamma-Ray Emission
  9. GRB 061121: ATCA & WSRT Radio Observations
  10. GRB061121: optical observations
  11. GRB 061126: Early Super-LOTIS Observations
  12. GRB 061126: optical observation
  13. GRB 061126: Tautenburg afterglow observations
  14. GRB 061126 : SDSS Pre-Burst Observations
  15. GRB 061126: Swift-XRT refined analysis
  16. GRB 061126: Swift/UVOT Observations
  17. GRB 061126, Swift-BAT refined analysis
  18. GRB 061126: SARA Observations
  19. GRB 061126: Early Detection of the IR Afterglow
  20. GRB 061126: Faulkes Telescope North Optical Observations
  21. GRB 061126: Swift/UVOT Afterglow Detection
  22. GRB 061126: XRT position
  23. GRB 061126: Swift detection of a burst
  24. GRB 061121: MDM Continued Monitoring
  25. GRB 061122: Confirmation of X-ray/Optical Afterglow
  26. GRB 061121: MDM Continuing Optical Decay
  27. GRB061121: optical observations
  28. GRB 061122: Candidate Optical Afterglow
  29. GRB 061121: Ep,i - Eiso correlation
  30. GRB 061121: MDM Optical Decay
  31. GRB061122: Swift/UVOT Optical Observations
  32. GRB 061121: ART detection in Ic
  33. GRB061121: P60 Observations
  34. Radio detection of GRB 061121
  35. GRB061122: Swift-XRT position
  36. Konus-Wind observation of GRB 061122
  37. GRB 061121: MDM Optical Observations
  38. GRB 061121 declared "Burst of Interest" by Swift team
  39. Konus-Wind and Konus-A observations of GRB 061121
  40. INTEGRAL results on GRB 061122
  41. Swift-BAT trigger 239987 is not a GRB
  42. GRB 061122A: a long GRB detected by INTEGRAL
  43. GRB 061121: Swift/UVOT Observations
  44. GRB 061121: Swift-XRT Team Refined Analysis
  45. GRB 061121, Swift-BAT refined analysis
  46. GRB 061121 : Planned XMM-Newton observation
  47. GRB 061121: Optical observation at the KANATA 1.5m telescope
  48. GRB 061121: Faulkes Telescope North Optical Observation
  49. GRB061121: Spectroscopic Redshift
  50. GRB 061121: ROTSE-III Confirmation of Optical Counterpart
  51. GRB 061121: Swift detection of a bright burst with an optical counterpart
  52. GRB 060605: NIR Observations
  53. GRB 050915B: optical afterglow
  54. GRB 060111B: Swift UVOT Refined Magnitudes
  55. GRB061110A: Correction to GCN5817
  56. GRB 061110A: refined R-band analysis
  57. GRB 061110B: NIR Observations
  58. Swift TOO observations of GRB061110A
  59. Swift/UVOT Upper Limits for GRB061110b
  60. Swift/UVOT Upper Limits for GRB061110a
  61. GRB 061110A - VLT tentative redshift
  62. GRB 061110B: Swift XRT refined analysis
  63. GRB 061110B, Swift-BAT refined analysis
  64. GRB 061110B: VLT redshift
  65. GRB061110B: Optical observations at Crni Vrh
  66. GRB 061110B: NOT optical observations
  67. GRB 061110A: Swift XRT refined analysis
  68. GRB 061110B: Swift/XRT position
  69. GRB 061110B : Liverpool Telescope Optical Afterglow Detection
  70. GRB 061110B: Swift-UVOT Initial Observation
  71. GRB 061110A, Swift-BAT refined analysis
  72. GRB 061110B: TAROT Calern observatory optical observations
  73. GRB 061110B: Swift detection of a burst
  74. GRB 061110: NOT observations
  75. GRB 061110: Candidate confirmed
  76. GRB 061110 : Optical afterglow candidate
  77. GRB 061110: ROTSE-III Optical Limits
  78. GRB 061110: Swift detection of a burst
  79. Swift-BAT Trigger 237821 is a Cosmic Ray Shower event
  80. GRB 061109: optical observation
  81. GRB 061109: TAROT Calern observatory optical observations
  82. GRB 061109: Swift detection of a possible burst
  83. GRB061028: MAGIC telescope GeV observation
  84. GRB 061027: TAROT La Silla observatory optical observations
  85. GRB 061007: Third Epoch ATCA Radio Observations
  86. GRB061019: second epoch CrAO observations
  87. GRB 061028: Swift/XRT Astrometry Correction
  88. GRB 061102: Swift/UVOT Magnitude Upper Limits
  89. GRB 061102, XRT refined analysis
  90. GRB 061004: Further VLT/NTT observations
  91. Swift-BAT Trigger 236481 is a Cosmic Ray Shower event
  92. GRB061102B: Super-LOTIS observations
  93. GRB 061028: Optical R passband observations
  94. GRB 061102B: Swift detection of a possible burst
  95. GRB 061102, Swift-BAT refined analysis
  96. GRB 061102: Swift detection of a burst
  97. GRB 061028: VLA Observation
  98. GRB 061004: Swift/XRT Astrometry Correction
  99. GRB 060801: Swift/XRT Astrometry Correction
  100. GRB 061028: Futher P200 Observations

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