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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"

32692 results found.

  1. GRB 071010: Swift-XRT observation
  2. GRB 071008, Swift-BAT refined analysis
  3. GRB 071010, Swift-BAT refined analysis
  4. Konus-Wind observation of GRB 071006
  5. GRB071008: Swift-XRT observation
  6. GRB 071010 REM NIR observations
  7. GRB 071010: Keck/LRIS Spectroscopy
  8. GRB 071010: Rapid PROMPT Detections
  9. GRB 071010: Keck Observations of the Afterglow
  10. GRB071008: IAC80 observation
  11. GRB 071003: XRT refined analysis
  12. GRB070920A: MAGIC telescope GeV observation
  13. Radio detection of GRB 071003 with the VLA
  14. GRB 070810B: further XRT analysis
  15. GRB 071003: VLT spectroscopy
  16. GRB 071003: Keck spectroscopy
  17. Konus-Wind observation of GRB 071003
  18. GRB071003: Faulkes Telescope North observations
  19. GRB 071003: Possible rebrightening
  20. GRB 071003 : Lulin R-band observations
  21. GRB 071003: Swift XRT position
  22. GRB 071003: OA power-law decay indices from KAIT
  23. GRB 071003: Keck HIRES spectroscopy
  24. GRB 071003, Swift-BAT refined analysis
  25. GRB 071003: MARGE Observations
  26. GRB 071003 Optical observations
  27. GRB 071003: P60 Confirmation of Optical Afterglow
  28. GRB 071003: KAIT optical afterglow observations
  29. GRB 070714B: host galaxy spectroscopic redshift
  30. GRB 071001: Swift-XRT Team refined analysis
  31. GRB 071001, Swift-BAT refined analysis
  32. Faulkes Telescope South observations of GRB 071001
  33. VLA observation of GRB 070923
  34. Disregard the Swift-XRT Notices today
  35. GRB 070911, SMARTS optical/IR afterglow observations
  36. GRB070925: Swift-XRT Afterglow confirmation
  37. GRB 070925: Gemini South Imaging
  38. GRB070925: Swift-XRT Position
  39. Update on Swift Status
  40. GRB 070920B: ROTSE-III Early Optical Limits
  41. Recent SGR1806-20 Activity
  42. GRB 070923, Swift-BAT refined analysis
  43. GRB 070920B: XRT observations
  44. GRB 070923: Galaxies within BAT localization
  45. GRB 070917: Suzaku/WAM observation of the prompt emission
  46. INTEGRAL ToO observations of SGR1806-20
  47. GRB 070920b, SMARTS optical observation
  48. GRB 070917: Confirmation of the X-ray afterglow
  49. GRB 070920b: LCO optical observations
  50. GRB 070920B, Swift-BAT refined analysis
  51. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  52. GRB 070920, Swift-BAT refined analysis
  53. SGR1806-20: Swift-BAT detection of enhanced activity
  54. GRB070917: Confirmation of optical afterglow
  55. GRB920925C: search for host galaxy
  56. GRB070917: optical observations
  57. GRB 070917: P60 Observations
  58. Konus-Wind observation of GRB 070917
  59. Swift Status and XRT Calibration Uncertainties
  60. GRB 070917: Swift-XRT observations
  61. GRB 070917: KAIT optical limits
  62. GRB 070917: MITSuME Akeno Ic upper limit
  63. GRB 070917: R band observations
  64. GRB 070917, Swift-BAT refined analysis
  65. GRB 070911: Suzaku WAM observation of the prompt emission
  66. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  67. GRB 070809: The Swift evidence for the SHB nature of this burst
  68. GRB 070913: Swift-BAT refined analysis
  69. GRB 070913: Corrected BAT position
  70. GRB 070913: SMARTS optical/IR observations
  71. GRB 070911: PAIRITEL IR Observations
  72. GRB 070911: Swift XRT refined analysis
  73. GRB 070911, Swift-BAT refined analysis
  74. IPN search for a GRB associated with TAROT transient on August 31
  75. Intense burst from SGR 1806-20 detected on September 7
  76. GRB 070809: Confirmation of optical transient
  77. Observations of possible TAROT GRB transient near IC 4779
  78. GRB 070810b: Image Subtraction of Multiple Keck Observations
  79. Las Campanas observations of possible TAROT GRB transient near IC
  80. Konus-Wind observation of GRB 070824
  81. Konus-Wind observation of very bright GRB 070821
  82. GRB 070731: Swift/UVOT Upper Limit
  83. GRB 070805: UVOT afterglow candidate retraction
  84. GRB070810b: optical candidate
  85. GRB 070810A: ROTSE-III Refined Analysis
  86. GRB 061110A: redshift confirmed
  87. GRB 070810B : Faulkes Telescope South Observations
  88. GRB 070810A: Continued Keck Imaging
  89. GRB 070810B: Keck spectroscopy of possible host galaxies
  90. GRB070810B: Swift/UVOT Upper Limits
  91. GRB 070810B: XRT refined analysis
  92. GRB 070810B, Swift-BAT refined analysis
  93. GRB 070809: Swift/UVOT Corrected Photometry
  94. Swift Trigger 287421: False trigger due to star tracker loss
  95. GRB 070810A: Swift-BAT refined analysis
  96. GRB 070810B: Xinglong TNT optical Upper Limit
  97. GRB070810B: Optical observations with KANATA
  98. GRB 070809: Swift/UVOT Upper Limits
  99. VLA upper limit on the short hard burst GRB 070729
  100. GRB 070810: Keck redshift and photometry

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