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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

19538 results found.

  1. GRB060115: REM observations
  2. GRB 060110: XRT position and analysis
  3. GRB 060116: ROTSE-III Optical Limits
  4. GRB060116: XRT position
  5. GRB060116: Faulkes North observation
  6. GRB 060116: Swift-BAT detection of a burst
  7. GRB 060115: Refined analysis of the Swift-BAT burst
  8. GRB 060115: Swift/UVOT upper limits
  9. GRB 060115: Swift XRT refined analysis
  10. GRB 060114: Swift/UVOT Observations
  11. GRB 060115: MITSuME optical afterglow candidate
  12. GRB 060115: Swift detection of a burst
  13. GRB 060114: Swift XRT upper limit
  14. GRB 060110: KAIT observations
  15. GRB 060111B: Swift XRT refined analysis
  16. GRB 060111A: refined UVOT anaysis
  17. GRB 060111B: TAROT optical observation
  18. GRB060111A: RTT150 optical observations
  19. GRB060111B: RTT150, possible host galaxy
  20. GRB 060111B: Refined analysis of the Swift-BAT burst
  21. GRB 060110: MARGE observations
  22. GRB 060111B: ROTSE-III Detection of Optical Counterpart Flare
  23. GRB 060111B: Swift detection of a burst
  24. GRB 060111: Swift-BAT Refined Analysis
  25. GRB 060111: TAROT optical observation
  26. GRB 060111: possible UVOT counterpart
  27. GRB060111 : XRT refined analysis
  28. GRB 060111: ROTSE-III Optical Limits
  29. GRB 060111: Swift detection of a burst
  30. GRB 060110: Swift-BAT refined analysis
  31. GRB 060109: Swift-BAT refined analysis
  32. GRB 060110a: RAPTOR detection of early optical emission.
  33. Correction to GRB 060109 XRT analysis
  34. GRB 060110: Swift-BAT detection of a burst
  35. GRB 060109: Refined Swift-XRT analysis
  36. GRB 060109: Swift/UVOT upper limits
  37. Swift UVOT correction to GCN 4455
  38. GRB 060109: Swift Detection of a long burst
  39. GRB 060108: Refined XRT analysis
  40. GRB 060108: VLT J-band observations
  41. GRB 060108: Swift/UVOT upper limits
  42. GRB 060105: quick look analysis of the Suzaku/XIS afterglow observation
  43. GRB060108: Faulkes Telescope observation
  44. GRB 060108: Refined analysis of the Swift-BAT burst
  45. GRB 060108: Swift XRT position
  46. GRB060108: Swift detection of its 100th GRB
  47. GRB 060105: Radio observations
  48. Konus-Wind observation of GRB 060105
  49. GRB 060105: Swift/UVOT upper limits
  50. GRB 060105: BAT refined analysis
  51. GRB 060105: XRT refined analysis
  52. GRB060105: Swift detection of a bright long burst
  53. Swift-BAT trigger 175653 is not an astrophysical source
  54. Swift-BAT trigger 175653 is probably not a GRB
  55. GRB 060102: Swift-BAT refined analysis
  56. Time Correction to GRB 060102
  57. GRB 060102: Swift-BAT detection of a burst
  58. GRB051211B: optical observations
  59. GRB051227: SARA Observations
  60. GRB 051221B: Optical Observations with Kuiper 1.54m
  61. GRB051221B: Radio observations
  62. GRB051227: Radio Observations
  63. GRB 051227: Swift/UVOT Upper Limits (Possible U-band
  64. GRB 051227: MDM Observation
  65. GRB 051227: Joint Swift-HETE Spectral Analysis
  66. GRB 051227: XRT refined analysis
  67. GRB 051227: Further analysis of the Swift-BAT burst
  68. GRB 051227: Refined analysis of the Swift-BAT burst
  69. GRB051227: SDSS pre-burst observations
  70. GRB 051227: Swift detection of a burst
  71. Konus-Wind observation of GRB 051221A
  72. GRB051221A: Suzaku WAM observation of the prompt emission
  73. GRB051016: analysis of the XMM-Newton observation
  74. GRB 051221A: Detection at 251nm with Swift UVOT
  75. GRB 051221A: Chandra Afterglow Position
  76. GRB 051221A: Refined spectral and temporal analysis of the Swift-BAT short hard burst
  77. GRB 051221B: ROTSE-III Optical Limits
  78. GRB 051221B: TAROT optical limits
  79. GRB 051221A: WSRT Radio Observations
  80. GRB 051221B: Refined analysis of the Swift-BAT burst
  81. Possible GRB 051221B: MDM Optical Detection
  82. GRB 051221A: RAPTOR Fading Counterpart Constraint
  83. GRB 051221B: BOOTES optical observations.
  84. Possible GRB 051221B: Swift XRT position
  85. Swift-BAT detection of a possible burst
  86. GRB 051221: Swift XRT refined analysis
  87. GRB 051221: Swift/UVOT upper limits
  88. GRB 051221: XRT position
  89. GRB 051221: Refined analysis of the Swift-BAT short hard burst
  90. GRB 051221: Swift detection of a bright short burst
  91. Refined analysis of the SWIFT J1626.6-5156
  92. Swift-BAT discovery of hard x-ray transient SWIFT J1626.6-5156
  93. Refined analysis of the Swift-BAT detection of the RS CVn star II Peg
  94. GRB 051211B: optical afterglow
  95. Swift detection of an RS CVn flare star
  96. Swift Trigger 172767 is not a GRB
  97. GRB 051215: Swift detection of a possible burst
  98. GRB 051215: A short GRB in a cluster?
  99. GRB 051213: Swift-BAT refined analysis
  100. GRB051211B: XRT refined analysis

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