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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"

32698 results found.

  1. GRB 060923C, optical observation
  2. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  3. GRB 060923C: VLT J-band observations
  4. GRB060923B: Swift/UVOT upper limits
  5. GRB 060923B: Swift XRT Refined Analysis
  6. GRB 060923C: Swift XRT refined analysis
  7. GRB 060923C, Swift-BAT partial refined analysis
  8. GRB 060923A: Swift XRT refined analysis
  9. GRB 060923C: Keck Observations
  10. GRB 060923A: Keck and Gemini Observations
  11. GRB 060923B, Swift-BAT refined analysis
  12. GRB060923C : Faulkes Telescope South optical limits
  13. GRB060923C: Faulkes Telescope North optical observations
  14. GRB 060923C: optical observation
  15. GRB 060923, Swift-BAT refined analysis
  16. GRB 060923: Early Super-LOTIS Observations
  17. GRB 060923: UKIRT nIR observations - candidate afterglow
  18. GRB060923: Faulkes Telescope North optical observations
  19. GRB060923 - SDSS Pre-Burst Observations
  20. GRB 060923: KAIT observations
  21. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  22. GRB060919: Swift/UVOT optical observations
  23. GRB 060919 : Faulkes South Telescope Observations
  24. GRB 060919, Swift-BAT refined analysis
  25. GRB060919: XRT refined analysis
  26. GRB 060912A: VLA Observation
  27. GRB 060912A: Probable Host Galaxy
  28. GRB060825: MAGIC telescope GeV observation
  29. Konus-Wind observation of GRB 060912
  30. GRB 060912: Redshift of nearby 2MASS galaxy
  31. GRB060912: optical observations
  32. GRB060912: Swift/UVOT Observations
  33. GRB060912: OPTIMA-Burst optical observations
  34. GRB 060912: Swift XRT Team Refined Analysis
  35. GRB 060912, Swift-BAT refined analysis
  36. GRB 060912: Correction to GCN 5559
  37. VLA observations of GRB 060908
  38. GRB 060908: redshift
  39. GRB 060908, Swift/XRT refined analysis
  40. GRB 060908: Swift/UVOT Observations
  41. GRB 060908: Danish/DFOSC optical observations
  42. GRB 060908, Swift-BAT refined analysis
  43. GRB 060904B : CFHT/WIRCam NIR afterglow observations
  44. GRB 060908: REM optical prompt observation
  45. GRB 060904A: Suzaku/WAM observation of the prompt emission
  46. GRB060906 , optical observation
  47. GRB060904b optical detections (delayed report due to internet outage)
  48. GRB 060906: optical observation
  49. GRB 060906: Early RAPTOR optical limits
  50. GRB 060906, Swift-BAT refined spectral analysis
  51. GRB 060906: Swift/XRT Refined Analysis
  52. GRB 060906: Swift-UVOT observations
  53. VLT redshift of GRB 060906
  54. GRB 060906, Swift-BAT refined analysis
  55. GRB 060906: FRAM observations - flash determination (airplane)
  56. GRB 060906: KAIT observations
  57. GRB 060906: Confirmation of P60 Optical Afterglow
  58. GRB 060906: observations with FRAM
  59. GRB 060904A Milagro GeV/TeV Observations
  60. GRB060904b, optical observations
  61. GRB 060904b: SMARTS optical/IR afterglow observations
  62. GRB 060904B: RTT150 optical observations
  63. GRB060904A: Swift/UVOT optical observations
  64. GRB 060904A: Subaru NIR observation
  65. GRB 060904A: pseudo-z from spectral parameters of the prompt emission
  66. GRB 060904B: Swift-BAT refined analysis
  67. GRB060904b: Optical observations with Swift/UVOT
  68. Konus-Wind observation of GRB 060904A
  69. GRB 060904B: Swift-XRT refined analysis
  70. GRB 060904A: Refined analysis of the Swift-BAT burst
  71. GRB 060904A: Swift-XRT refined analysis
  72. GRB 060904A: Suzaku-XIS and -HXD observation plan
  73. GRB 060904B: VLT redshift
  74. GRB 060904A: P60 Observations
  75. GRB060904B: Watcher observations
  76. GRB 060904B BOOTES-IR and 1.5m OSN observations
  77. GRB 060904B: ROTSE-III Detection of Optical Counterpart
  78. 060901: Swift UVOT followup observations
  79. Konus-Wind observation of GRB 060901
  80. GRB 060901: SMARTS optical/IR observations update
  81. GRB 060901: Swift/XRT Refined Analysis
  82. GRB 060901: SMARTS optical/IR observations
  83. GRB 060901: Swift/XRT Position
  84. GRB 060901: Watcher observations
  85. GRB 060605, observations using an Integral Field Unit
  86. GRB 060604: VLA Observation
  87. GRB 060814: Suzaku/WAM observation of the prompt emission
  88. GRB 060605: VLA Observation
  89. GRB 060707: VLA observation
  90. GRB 060825: VLA observations
  91. Swift-BAT trigger 226614 is not a GRB
  92. GRB 060825: XRT Team Refined Analysis
  93. GRB 060825: Swift-BAT Refined Analysis
  94. GRB 060813: Swift/BAT, Konus-Wind, and Suzaku/WAM joint prompt spectral analysis
  95. GRB060825: Liverpool Telescope optical observations
  96. GRB 060825: TNG optical observations
  97. GRB 060825: P60 Observations
  98. GRB060825: BOOTES-IR optical observations
  99. GRB060801: host galaxy redshift
  100. Radio observations of GRB 060719

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