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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"

26127 results found.

  1. Konus-Wind observation of GRB 071003
  2. GRB071003: Faulkes Telescope North observations
  3. GRB 071003: Possible rebrightening
  4. GRB 071003 : Lulin R-band observations
  5. GRB 071003: Swift XRT position
  6. GRB 071003: OA power-law decay indices from KAIT
  7. GRB 071003, Swift-BAT refined analysis
  8. GRB 071003: MARGE Observations
  9. GRB 071003 Optical observations
  10. GRB 071003: P60 Confirmation of Optical Afterglow
  11. GRB 071003: KAIT optical afterglow observations
  12. GRB 071003: Swift detection of a bright burst
  13. GRB 070714B: host galaxy spectroscopic redshift
  14. GRB 071001: Swift-XRT Team refined analysis
  15. GRB 071001, Swift-BAT refined analysis
  16. Faulkes Telescope South observations of GRB 071001
  17. GRB 071001: Swift detection of a burst
  18. VLA observation of GRB 070923
  19. Disregard the Swift-XRT Notices today
  20. GRB 070911, SMARTS optical/IR afterglow observations
  21. GRB070925: Swift-XRT Afterglow confirmation
  22. GRB 070925: Gemini South Imaging
  23. GRB070925: Swift-XRT Position
  24. Update on Swift Status
  25. GRB 070920B: ROTSE-III Early Optical Limits
  26. Recent SGR1806-20 Activity
  27. GRB 070923, Swift-BAT refined analysis
  28. GRB 070920B: XRT observations
  29. GRB 070923: Swift detection of a short hard burst
  30. GRB 070917: Suzaku/WAM observation of the prompt emission
  31. GRB 070920B: TAROT La Silla observatory optical observations
  32. GRB 070917: Confirmation of the X-ray afterglow
  33. GRB 070920B, Swift-BAT refined analysis
  34. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  35. GRB 070920B: NOT optical observations
  36. GRB 070920B: Swift detection of a burst
  37. GRB 070920, Swift-BAT refined analysis
  38. GRB 070920: TAROT Calern observatory optical observations
  39. GRB 070920: Swift detection of a burst
  40. SGR1806-20: Swift-BAT detection of enhanced activity
  41. GRB070917: Confirmation of optical afterglow
  42. GRB920925C: search for host galaxy
  43. GRB070917: optical observations
  44. GRB 070917: P60 Observations
  45. GRB 070917: pseudo-z= 2.40 from prompt emission spectrum
  46. Konus-Wind observation of GRB 070917
  47. Swift Status and XRT Calibration Uncertainties
  48. GRB 070917: Swift-XRT observations
  49. GRB 070917: KAIT optical limits
  50. GRB 070917: R band observations
  51. GRB 070917, Swift-BAT refined analysis
  52. GRB 070917: Swift detection of a bright burst
  53. GRB 070911: Suzaku WAM observation of the prompt emission
  54. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  55. GRB 070809: The Swift evidence for the SHB nature of this burst
  56. GRB 070913: Afterglow candidate detected by TAROT La Silla observatory
  57. GRB 070913: Swift-BAT refined analysis
  58. GRB 070913: Corrected BAT position
  59. GRB 070913: TAROT La Silla observatory optical observations
  60. GRB 070913: Swift detection of a burst
  61. Swift-BAT Notices back to autonomous real-time distribution
  62. GRB 070911: PAIRITEL IR Observations
  63. GRB 070911: Swift XRT refined analysis
  64. GRB 070911, Swift-BAT refined analysis
  65. GRB 070911: Swift detection of a burst
  66. IPN search for a GRB associated with TAROT transient on August 31
  67. Intense burst from SGR 1806-20 detected on September 7
  68. GRB 070810b: Image Subtraction of Multiple Keck Observations
  69. GRB 070824 - Combined SuperAGILE/IPN Localization
  70. GRB 070731: Swift/UVOT Upper Limit
  71. GRB 070805: UVOT afterglow candidate retraction
  72. GRB070810b: optical candidate
  73. GRB 070810A: ROTSE-III Refined Analysis
  74. Swift observatory off line
  75. GRB 061110A: redshift confirmed
  76. GRB 070810B : Faulkes Telescope South Observations
  77. GRB 070810A: Continued Keck Imaging
  78. GRB 070810B: Keck spectroscopy of possible host galaxies
  79. GRB070810B: Swift/UVOT Upper Limits
  80. GRB 070810B: XRT refined analysis
  81. GRB 070810B, Swift-BAT refined analysis
  82. GRB 070809: Swift/UVOT Corrected Photometry
  83. Swift Alert 070810.8: MASTER optical observation
  84. Swift Trigger 287421: False trigger due to star tracker loss
  85. GRB 070810A: Swift-BAT refined analysis
  86. GRB 070809: Swift/UVOT Upper Limits
  87. GRB 070810B: Swift detection of a short burst
  88. VLA upper limit on the short hard burst GRB 070729
  89. GRB 070810: Keck redshift and photometry
  90. No radio detection in superAGILE burst 070724B
  91. GRB 070809: Keck Imaging
  92. GRB 070810: Swift-XRT Team Refined Analysis
  93. GRB 070809: Swift-XRT refined analysis
  94. GRB 070810: enhanced Swift-XRT position
  95. GRB 070810: Swift/UVOT Optical Counterpart
  96. GRB 070810: ROTSE-III Detection of Optical Counterpart
  97. GRB 070810: Swift detection of a burst
  98. GRB 070809, Swift-BAT refined analysis
  99. GRB 070809: Optical Pre-imaging from Palomar
  100. GRB 070808: Swift/UVOT upper limits

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