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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"

32770 results found.

  1. GRB 091117: Swift XRT refined analysis
  2. GRB 091117: Gemini-North spectroscopy of DSS galaxy
  3. Konus-Wind observations of GRB 091117A
  4. GRB 091117: Magellan optical observations
  5. GRB 091117: XRT source coincident with a DSS galaxy
  6. GRB 091112: Suzaku WAM observation of the prompt emission
  7. GRB 091102A: Suzaku WAM observation of the prompt emission
  8. GRB 091109B: Suzaku WAM observation of the prompt emission
  9. GRB091111: Swift XRT refined analysis
  10. Konus-Wind and Konus-RF observations of GRB 091031
  11. GRB 091112: Swift-BAT refined analysis
  12. GRB 091112: Fermi GBM observation
  13. GRB 091031: Fermi LAT detection of a faint burst
  14. GRB 091111: BOOTES-3 contemporaneous imaging
  15. GRB 091111: a faint long GRB detected with INTEGRAL
  16. GRB 091109A: GROND and VLT observations
  17. GRB 091109B: Swift/UVOT Upper Limits
  18. GRB 091109B: VLT afterglow confirmation
  19. GRB 091109B: Swift-XRT Team refined analysis
  20. GRB 091109b: Magellan Observations
  21. GRB 091109B: Swift-BAT refined analysis
  22. GRB 091109B: Optical limits from Watcher
  23. GRB 091109B: ROTSE-III Optical Limits
  24. GRB091109: Correction to GCN 10139
  25. GRB 091109: Swift-XRT refined analysis
  26. GRB 091109: BOOTES-3 observations
  27. GRB 091109: Swift/UVOT observations
  28. GRB 091109: Faulkes Telescope South observations
  29. GRB 091109: Swift-BAT refined analysis
  30. GRB 091029: Observations from Stardome Observatory
  31. GRB 091104: Swift-BAT refined analysis
  32. GRB 091104: Swift XRT Refined Analysis
  33. GRB 091104: Swift/UVOT Upper Limits
  34. GRB091026 : IRSF NIR upper limit
  35. GRB091102 : MOA optical upper limit
  36. GRB 091102: LABOCA/APEX submm observations
  37. Fermi LAT Upper Limits on GRB 091010
  38. GRB 091102 : Faulkes Telescope South Upper Limits
  39. GRB 091102A: Fermi GBM observation
  40. GRB 091102: Swift-XRT refined analysis
  41. GRB 091102: Swift/UVOT Upper Limits
  42. GRB 091102: GROND Upper Limits
  43. GRB 091102: BOOTES-3 observations
  44. GRB 091102: Swift-BAT refined analysis
  45. GRB 091102: Swift/XRT localization
  46. GRB 091102: ROTSE-III Optical Limits
  47. GRB 091102: Swift/UVOT Finding Chart Observation
  48. GRB 091024: optical observations
  49. GRB 091031: Fermi GBM detection
  50. GRB 091024: Fermi LAT upper limits
  51. GRB 090926a, SMARTS optical/IR afterglow observations
  52. GRB 091018: Skynet/PROMPT Observations of Possible Host Galaxy
  53. GRB 091029, SMARTS optical/IR afterglow observations
  54. GRB 091018, SMARTS optical/IR afterglow observations
  55. GRB 090920: Skynet/DSO Detection
  56. GRB091029: Swift/UVOT observations
  57. GRB 091029: Skynet/PROMPT Continued Observations of Fading
  58. GRB 091029: Swift XRT refined analysis
  59. GRB 091029: BOOTES-3 observations
  60. GRB 091029: Swift-BAT refined analysis
  61. GRB091024 optical observations
  62. GRB 091029: Gemini-South Redshift
  63. GRB 091029: Skynet/PROMPT Observations of Peak and Fading
  64. GRB 091029: GROND Detection of the Optical/NIR Afterglow
  65. A mistake in testing a new function in Swift
  66. GRB 091020: Fermi GBM observation
  67. GRB 091026: Suzaku WAM observation of the prompt emission
  68. GRB 091024: Keck/LRIS Spectroscopy
  69. GRB 091024: YNAO-GMG observations
  70. GRB 091026: GROND Upper Limits
  71. GRB 091020: Late TLS detection
  72. GRB 091026: Swift-BAT refined analysis
  73. Radio afterglow detection from GRB 091020
  74. GRB 091026: Swift/UVOT Upper Limits
  75. GRB 091024: Burst was outside the Swift-BAT FOV after T0(BAT)+460sec
  76. GRB 091026: Swift-XRT refined analysis
  77. Konus-Wind and Konus-RF observations of GRB 091024
  78. GRB 091026: Updated Swift-XRT position
  79. GRB 091020 : Xinglong TNT upper limit
  80. Swift-BAT Triggers 373776-373778 are not real
  81. GRB091024 Swift/UVOT Upper Limits
  82. GRB 091024: TLS Upper Limit
  83. GRB 091020: Early TLS Multicolor detections, red afterglow
  84. GRB 091024: KAIT optical afterglow observations
  85. GRB 091024: Super-LOTIS early observations
  86. GRB091024: VRcIc Afterglow Observations
  87. GRB 091024: Swift-BAT refined analysis
  88. Swift-BAT Triggers 373679-373684 are not real
  89. GRB 091024: Fermi GBM Observations
  90. GRB 091024: Swift-XRT team refined analysis
  91. GRB 091024: Xinglong TNT optical observation
  92. GRB 091024 : Faulkes Telescope North - Afterglow Confirmation
  93. GRB 091024 Gemini-North redshift
  94. GRB 091024: GRAS004 optical observations
  95. GRB 091024: Faulkes Telescope North Afterglow Candidate
  96. GRB 091018: Skynet/PROMPT Continued Observations of Fading
  97. GRB 091020: Additional Lick observations
  98. Konus-Wind observations of GRB 091020 (correction to GCN 10057)
  99. GRB 091020: Lick observations
  100. Konus-Wind observations of GRB 091010

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