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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"

21469 results found.

  1. GRB 060111: TAROT optical observation
  2. GRB 060111: possible UVOT counterpart
  3. GRB060111 : XRT refined analysis
  4. GRB 060111: ROTSE-III Optical Limits
  5. GRB 060111: Swift detection of a burst
  6. GRB 060110: Swift-BAT refined analysis
  7. GRB 060109: Swift-BAT refined analysis
  8. GRB 060108: z-band imaging from Gemini-North
  9. GRB 060110a: RAPTOR detection of early optical emission.
  10. Correction to GRB 060109 XRT analysis
  11. GRB 060110: Swift-BAT detection of a burst
  12. GRB 060109: Refined Swift-XRT analysis
  13. GRB 060109: Swift/UVOT upper limits
  14. GRB 060108: ISAS early observations and near IR upper limit
  15. GRB060108: P200 Ks Observations
  16. GRB 060108: early UKIRT K-band observations
  17. Swift UVOT correction to GCN 4455
  18. GRB 060109: Swift Detection of a long burst
  19. GRB 060108: a dark burst?
  20. GRB 060108: Refined XRT analysis
  21. GRB 060108: VLT J-band observations
  22. GRB 060108: Mitsume optical observations
  23. GRB 060108: Swift/UVOT upper limits
  24. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  25. GRB060108: Faulkes Telescope observation
  26. GRB 060108: Refined analysis of the Swift-BAT burst
  27. GRB 060108: Swift XRT position
  28. GRB060108: Swift detection of its 100th GRB
  29. GRB 060105: Radio observations
  30. GRB 060105: MDM Observation
  31. Konus-Wind observation of GRB 060105
  32. GRB 060105: ISAS observations and near IR upper limit
  33. GRB 060105: Swift/UVOT upper limits
  34. GRB 060105: Mitsume optical observations
  35. GRB 060105: BAT refined analysis
  36. GRB 060102 - no XRT afterglow
  37. GRB 060105: XRT refined analysis
  38. GRB060105: Swift detection of a bright long burst
  39. Swift-BAT trigger 175653 is not an astrophysical source
  40. Swift-BAT trigger 175653 is probably not a GRB
  41. GRB 060102: Swift-BAT refined analysis
  42. Time Correction to GRB 060102
  43. GRB 060102: Swift-BAT detection of a burst
  44. GRB051211B: optical observations
  45. GRB051227: SARA Observations
  46. GRB 051221B: Optical Observations with Kuiper 1.54m
  47. GRB051221B: Radio observations
  48. GRB051227: Radio Observations
  49. GRB 051227: Swift/UVOT Upper Limits (Possible U-band
  50. GRB 051227: Gemini observations
  51. GRB 051227: Keck Spectroscopy
  52. GRB 051227: Magellan r'-band Imaging/Astrometry
  53. GRB 051227: refined analysis of VLT images
  54. GRB 051227: P60 Observations
  55. GRB 051227: MDM Observation
  56. GRB 051227: R-band object in the XRT error circle
  57. GRB 051227: Joint Swift-HETE Spectral Analysis
  58. GRB 051227: XRT refined analysis
  59. GRB 051227: Further analysis of the Swift-BAT burst
  60. GRB 051227: Refined analysis of the Swift-BAT burst
  61. GRB051227: SDSS pre-burst observations
  62. GRB 051227: Swift detection of a burst
  63. Konus-Wind observation of GRB 051221A
  64. GRB051221A: Suzaku WAM observation of the prompt emission
  65. GRB051016: analysis of the XMM-Newton observation
  66. GRB 051221A: Detection at 251nm with Swift UVOT
  67. GRB 051221A: Chandra Afterglow Position
  68. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  69. GRB 051221B: ROTSE-III Optical Limits
  70. GRB 051221B: TAROT optical limits
  71. GRB 051221A: WSRT Radio Observations
  72. GRB 051221B: Refined analysis of the Swift-BAT burst
  73. Possible GRB 051221B: MDM Optical Detection
  74. GRB 051221A: RAPTOR Fading Counterpart Constraint
  75. GRB 051221B: BOOTES optical observations.
  76. Possible GRB 051221B: Swift XRT position
  77. Swift-BAT detection of a possible burst
  78. GRB 051221: Discovery of fading optical afterglow
  79. GRB 051221: Swift XRT refined analysis
  80. GRB 051221: Swift/UVOT upper limits
  81. GRB 051221: No variability in Gemini data
  82. GRB 051221: Gemini observations
  83. GRB 051221: Improved astrometry of the IR counterpart
  84. GRB051221: K-band source
  85. GRB 051221: XRT position
  86. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  87. GRB 051221: Swift detection of a bright short burst
  88. Refined analysis of the SWIFT J1626.6-5156
  89. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  90. Refined analysis of the Swift-BAT detection of the RS CVn star II Peg
  91. GRB 051211B: optical afterglow
  92. Swift detection of an RS CVn flare star
  93. Swift Trigger 172767 is not a GRB
  94. GRB 051215: Swift detection of a possible burst
  95. GRB 051215: A short GRB in a cluster?
  96. GRB051211B: Probable radio afterglow
  97. GRB051105: optical observations
  98. GRB 051213: Swift-BAT refined analysis
  99. GRB051211B: XRT refined analysis
  100. GRB 051213: Swift-BAT detection of a burst

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