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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"

45554 results found.

  1. GRB 060927 optical limit
  2. GRB 060927, Swift-BAT refined analysis
  3. GRB 060927: Xinglong TNT optical observations
  4. GRB060926: improved redshift
  5. GRB 060927, optical observation
  6. GRB 060927: Possible host galaxy (star?) in the SDSS
  7. GRB 060927 : Kiso optical observation
  8. GRB060927: Faulkes Telescope South observation
  9. GRB 060926: MASTER: first minutes decay
  10. GRB060927 - SDSS Pre-Burst Observations
  11. GRB 060927: optical afterglow confirmation
  12. GRB 060927A: ROTSE-III Detection of Optical Counterpart
  13. Swift XRT boresight
  14. GRB 060927: Swift detection of a burst
  15. GRB060926: VLT redshift
  16. GRB 060926: Swift-UVOT Detections
  17. GRB 060923A: Schedule of Spitzer Space Telescope Observations
  18. GRB 060926: OPTIMA-Burst -- further observations
  19. GRB 060926: Swift XRT refined analysis
  20. GRB 060926, Swift-BAT refined analysis
  21. GRB 060923A: Radio Observations
  22. GRB 060926: RTT150, UVOT afterglow candidate confirmation
  23. GRB 060912A: Redshift of probable host galaxy
  24. GRB 060926: BOOTES-IR observations
  25. GRB 060926: Watcher observations
  26. GRB060926 OPTIMA-Burst optical observation
  27. GRB 060926: Swift detection of a burst
  28. GRB 060923C, Swift-BAT refined analysis
  29. GRB 060923C: VLA Observation
  30. GRB 060923C: NIR afterglow confirmed
  31. GRB060923C: AROMA optical obsevation
  32. GRB 060923C: Gemini Observations and Afterglow Candidate
  33. GRB 060923C, optical observation
  34. GRB 060923A: Gemini Second Epoch and Afterglow Confirmation
  35. GRB 060923C: VLT J-band observations
  36. GRB060923B: Swift/UVOT upper limits
  37. GRB 060923B: Swift XRT Refined Analysis
  38. GRB 060923C: Swift XRT refined analysis
  39. GRB 060923C, Swift-BAT partial refined analysis
  40. GRB 060923A: Swift XRT refined analysis
  41. GRB 060923C: Keck Observations
  42. GRB 060923A: Keck and Gemini Observations
  43. GRB 060923C: Xinglong TNT optical observations
  44. GRB 060923B, Swift-BAT refined analysis
  45. GRB060923C : Faulkes Telescope South optical limits
  46. GRB060923C: Faulkes Telescope North optical observations
  47. GRB 060923C: optical observation
  48. GRB 060923C: Swift detection of a burst
  49. GRB 060923B: Swift detection of a burst
  50. GRB 060923, Swift-BAT refined analysis
  51. GRB 060923: Early Super-LOTIS Observations
  52. GRB 060923: UKIRT nIR observations - candidate afterglow
  53. GRB060923: Faulkes Telescope North optical observations
  54. GRB060923 - SDSS Pre-Burst Observations
  55. GRB 060923: KAIT observations
  56. GRB 060923: Swift detection of a burst
  57. Swift detection of IGR J17497-2821 (trigger 230504)
  58. Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216
  59. GRB060919: Swift/UVOT optical observations
  60. GRB 060919 : Faulkes South Telescope Observations
  61. GRB 060919, Swift-BAT refined analysis
  62. GRB060919: XRT refined analysis
  63. GRB 060919: TAROT optical observations
  64. GRB 060919: Swift detection of a burst
  65. GRB 060912A: VLA Observation
  66. GRB 060912A: Probable Host Galaxy
  67. IBAS Alert n.3470: not a GRB
  68. GRB060825: MAGIC telescope GeV observation
  69. Konus-Wind observation of GRB 060912
  70. IBAS Alert No.3468: not a GRB
  71. GRB 060912: Redshift of nearby 2MASS galaxy
  72. GRB060912: optical observations
  73. GRB 060912B: Watcher observations
  74. GRB060912: Swift/UVOT Observations
  75. GRB060912: OPTIMA-Burst optical observations
  76. GRB 060912B: a long GRB detected with INTEGRAL
  77. GRB 060912: Swift XRT Team Refined Analysis
  78. GRB 060912, Swift-BAT refined analysis
  79. GRB 060912: Correction to GCN 5559
  80. GRB 060912: Swift detection of a burst with an optical afterglow
  81. GRB060906: Danish/DFOSC optical observations
  82. VLA observations of GRB 060908
  83. GRB 060908: redshift
  84. GRB 060908, Swift/XRT refined analysis
  85. GRB 060908: Swift/UVOT Observations
  86. GRB 060908: Danish/DFOSC optical observations
  87. GRB 060908, Swift-BAT refined analysis
  88. GRB 060908 - SDSS Pre-burst Observations
  89. GRB 060904B : CFHT/WIRCam NIR afterglow observations
  90. GRB 060904B: Kiso Optical observation
  91. GRB 060904A : Optical limit
  92. GRB 060908: REM optical prompt observation
  93. GRB 060908: PROMPT Detection of a Bright Counterpart
  94. GRB 060908: Swift detection of a burst with a bright optical counterpart
  95. GRB 060904A: Suzaku/WAM observation of the prompt emission
  96. GRB060906 , optical observation
  97. GRB060904b optical detections (delayed report due to internet outage)
  98. GRB 060906: optical observation
  99. GRB 060906: Early RAPTOR optical limits
  100. GRB 060906, Swift-BAT refined spectral analysis

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