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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"

32717 results found.

  1. GRB 071011: Confirmation of P60 optical afterglow
  2. GRB 071010B: Optical Detection
  3. GRB 071011: Kanazawa Optical limits
  4. GRB 071011: P60 Optical Afterglow Candidate
  5. GRB 071011: MARGE Optical Limits
  6. GRB 071010B: Super-LOTIS upper limit
  7. GRB 071010B optical photometry
  8. GRB 071011: XRT afterglow detection
  9. GRB 071010B: Keck/LRIS Spectroscopy
  10. GRB 071011, Swift-BAT refined analysis
  11. GRB 071010B: Gemini Spectroscopic Observations
  12. GRB 071011: Early Super-LOTIS Observations
  13. GRB 071011: NAYUTA Optical Observation
  14. GRB 071010A: Continued Keck Imaging
  15. GRB 071010B: Bright OT confirmed with TLS
  16. Optical Observation: GRB 071010
  17. Optical observations: GRB 071010A
  18. Konus-Wind observation of GRB 071010B
  19. GRB071010B: Swift/XRT detection
  20. GRB 071010B, Swift-BAT refined analysis
  21. GRB 071010A: bright NIR afterglow
  22. GRB 071006, Swift-BAT refined analysis
  23. GRB071008: optical observations
  24. GRB 071010B possible optical transient
  25. GRB 071010A: Keck/LRIS Photometry
  26. GRB 071010: Swift-XRT observation
  27. GRB 071008, Swift-BAT refined analysis
  28. GRB 071010, Swift-BAT refined analysis
  29. Konus-Wind observation of GRB 071006
  30. GRB071008: Swift-XRT observation
  31. GRB 071010 REM NIR observations
  32. GRB 071010: Keck/LRIS Spectroscopy
  33. GRB 071010: Rapid PROMPT Detections
  34. GRB 071010: Keck Observations of the Afterglow
  35. GRB071008: IAC80 observation
  36. GRB 071003: XRT refined analysis
  37. GRB070920A: MAGIC telescope GeV observation
  38. Radio detection of GRB 071003 with the VLA
  39. GRB 070810B: further XRT analysis
  40. GRB 071003: VLT spectroscopy
  41. GRB 071003: Keck spectroscopy
  42. Konus-Wind observation of GRB 071003
  43. GRB071003: Faulkes Telescope North observations
  44. GRB 071003: Possible rebrightening
  45. GRB 071003 : Lulin R-band observations
  46. GRB 071003: Swift XRT position
  47. GRB 071003: OA power-law decay indices from KAIT
  48. GRB 071003: Keck HIRES spectroscopy
  49. GRB 071003, Swift-BAT refined analysis
  50. GRB 071003: MARGE Observations
  51. GRB 071003 Optical observations
  52. GRB 071003: P60 Confirmation of Optical Afterglow
  53. GRB 071003: KAIT optical afterglow observations
  54. GRB 070714B: host galaxy spectroscopic redshift
  55. GRB 071001: Swift-XRT Team refined analysis
  56. GRB 071001, Swift-BAT refined analysis
  57. Faulkes Telescope South observations of GRB 071001
  58. VLA observation of GRB 070923
  59. Disregard the Swift-XRT Notices today
  60. GRB 070911, SMARTS optical/IR afterglow observations
  61. GRB070925: Swift-XRT Afterglow confirmation
  62. GRB 070925: Gemini South Imaging
  63. GRB070925: Swift-XRT Position
  64. Update on Swift Status
  65. GRB 070920B: ROTSE-III Early Optical Limits
  66. Recent SGR1806-20 Activity
  67. GRB 070923, Swift-BAT refined analysis
  68. GRB 070920B: XRT observations
  69. GRB 070923: Galaxies within BAT localization
  70. GRB 070917: Suzaku/WAM observation of the prompt emission
  71. INTEGRAL ToO observations of SGR1806-20
  72. GRB 070920b, SMARTS optical observation
  73. GRB 070917: Confirmation of the X-ray afterglow
  74. GRB 070920b: LCO optical observations
  75. GRB 070920B, Swift-BAT refined analysis
  76. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  77. GRB 070920, Swift-BAT refined analysis
  78. SGR1806-20: Swift-BAT detection of enhanced activity
  79. GRB070917: Confirmation of optical afterglow
  80. GRB920925C: search for host galaxy
  81. GRB070917: optical observations
  82. GRB 070917: P60 Observations
  83. Konus-Wind observation of GRB 070917
  84. Swift Status and XRT Calibration Uncertainties
  85. GRB 070917: Swift-XRT observations
  86. GRB 070917: KAIT optical limits
  87. GRB 070917: MITSuME Akeno Ic upper limit
  88. GRB 070917: R band observations
  89. GRB 070917, Swift-BAT refined analysis
  90. GRB 070911: Suzaku WAM observation of the prompt emission
  91. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  92. GRB 070809: The Swift evidence for the SHB nature of this burst
  93. GRB 070913: Swift-BAT refined analysis
  94. GRB 070913: Corrected BAT position
  95. GRB 070913: SMARTS optical/IR observations
  96. GRB 070911: PAIRITEL IR Observations
  97. GRB 070911: Swift XRT refined analysis
  98. GRB 070911, Swift-BAT refined analysis
  99. IPN search for a GRB associated with TAROT transient on August 31
  100. Intense burst from SGR 1806-20 detected on September 7

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