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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"

32725 results found.

  1. GRB 091102: ROTSE-III Optical Limits
  2. GRB 091102: Swift/UVOT Finding Chart Observation
  3. GRB 091024: optical observations
  4. GRB 091031: Fermi GBM detection
  5. GRB 091024: Fermi LAT upper limits
  6. GRB 090926a, SMARTS optical/IR afterglow observations
  7. GRB 091018: Skynet/PROMPT Observations of Possible Host Galaxy
  8. GRB 091029, SMARTS optical/IR afterglow observations
  9. GRB 091018, SMARTS optical/IR afterglow observations
  10. GRB 090920: Skynet/DSO Detection
  11. GRB091029: Swift/UVOT observations
  12. GRB 091029: Skynet/PROMPT Continued Observations of Fading
  13. GRB 091029: Swift XRT refined analysis
  14. GRB 091029: BOOTES-3 observations
  15. GRB 091029: Swift-BAT refined analysis
  16. GRB091024 optical observations
  17. GRB 091029: Gemini-South Redshift
  18. GRB 091029: Skynet/PROMPT Observations of Peak and Fading
  19. GRB 091029: GROND Detection of the Optical/NIR Afterglow
  20. A mistake in testing a new function in Swift
  21. GRB 091020: Fermi GBM observation
  22. GRB 091026: Suzaku WAM observation of the prompt emission
  23. GRB 091024: Keck/LRIS Spectroscopy
  24. GRB 091024: YNAO-GMG observations
  25. GRB 091026: GROND Upper Limits
  26. GRB 091020: Late TLS detection
  27. GRB 091026: Swift-BAT refined analysis
  28. Radio afterglow detection from GRB 091020
  29. GRB 091026: Swift/UVOT Upper Limits
  30. GRB 091024: Burst was outside the Swift-BAT FOV after T0(BAT)+460sec
  31. GRB 091026: Swift-XRT refined analysis
  32. Konus-Wind and Konus-RF observations of GRB 091024
  33. GRB 091026: Updated Swift-XRT position
  34. GRB 091020 : Xinglong TNT upper limit
  35. Swift-BAT Triggers 373776-373778 are not real
  36. GRB091024 Swift/UVOT Upper Limits
  37. GRB 091024: TLS Upper Limit
  38. GRB 091020: Early TLS Multicolor detections, red afterglow
  39. GRB 091024: KAIT optical afterglow observations
  40. GRB 091024: Super-LOTIS early observations
  41. GRB091024: VRcIc Afterglow Observations
  42. GRB 091024: Swift-BAT refined analysis
  43. Swift-BAT Triggers 373679-373684 are not real
  44. GRB 091024: Fermi GBM Observations
  45. GRB 091024: Swift-XRT team refined analysis
  46. GRB 091024: Xinglong TNT optical observation
  47. GRB 091024 : Faulkes Telescope North - Afterglow Confirmation
  48. GRB 091024 Gemini-North redshift
  49. GRB 091024: GRAS004 optical observations
  50. GRB 091024: Faulkes Telescope North Afterglow Candidate
  51. GRB 091018: Skynet/PROMPT Continued Observations of Fading
  52. GRB 091020: Additional Lick observations
  53. Konus-Wind observations of GRB 091020 (correction to GCN 10057)
  54. GRB 091020: Lick observations
  55. Konus-Wind observations of GRB 091010
  56. GRB 091020: Swift-XRT refined analysis
  57. GRB 091018: Swift XRT refined analysis
  58. GRB091020 Swift/UVOT observations
  59. GRB 091020: NOT spectroscopic redshift
  60. GRB 091020: MASTER optical transient polarimetry
  61. GRB 091020, Swift-BAT refined analysis
  62. GRB 090926A: Late-time Gemini South Observations and Possible Jet Break
  63. GRB 091018: miniTAO/ANIR Observations
  64. GRB 091018: Skynet/PROMPT Observations of Fading
  65. Konus-RF observation of GRB 091018
  66. GRB 091018 : Faulkes Telescope South Observations
  67. GRB 091018: BOOTES-3 observations
  68. GRB 091018: VLT/X-shooter spectra
  69. GRB091018: Swift/UVOT observations
  70. GRB 091018: Swift-BAT refined analysis
  71. GRB 091018: GROND observations
  72. GRB091018: Magellan Echellette Observations
  73. GRB 091018: ROTSE-III Detection of Optical Counterpart
  74. GRB 091015: Skynet/PROMPT Observations
  75. GRB 091003: Gemini-N redshift of possible host galaxy
  76. GRB 091010: optical obsevation
  77. GRB 091015: RTT150 optical observations
  78. GRB 090726 R band observations
  79. GRB 091010: optical afterglow candidate rejection
  80. GRB 091015: correction to GCN 10025
  81. GRB 091010: Swift-XRT refined analysis
  82. GRB 091010: Suzaku WAM observation of the prompt emission
  83. GRB 091010: AGILE-MCAL measurement and GRID upper limit
  84. Radio observation of GRB090927 with ATCA
  85. Radio observation of GRB090926a with ATCA
  86. Radio observation of GRB080916c with ATCA
  87. GRB 091010: Fermi GBM observation
  88. GRB 091010: Faulkes Telescope North observations
  89. GRB 090531A: Skynet/PROMPT Observations
  90. GRB 090530A: Skynet/DSO Detections
  91. GRB 091010: RXTE detection
  92. Konus-Wind observations of GRB 091010
  93. GRB 091010: Enhanced XRT position
  94. GRB 091010 optical upper limits
  95. Detection of a short GRB 090929A by RT-2 Experiment
  96. RT-2 observation of the bright GRB 090926A
  97. GRB 091010: GROND afterglow candidate
  98. GRB 091010: Swift/UVOT Upper Limits
  99. GRB 091010: Swift-XRT position
  100. SuperAGILE GRB is 091010 and not 090910

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