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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"
  1. IPN localization of short hard GRB 081216
  2. GRB 081211B - possibly a short burst with extended emission
  3. GRB 081118: Zadko observations
  4. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  5. GRB 081215A: Gamma Repeater?
  6. GRB 0811215A: MASTER prompt optical observations
  7. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  8. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  9. Possible GRB 081211B: Swift/UVOT Upper Limits
  10. GRB 081213: Fermi GBM detection
  11. GRB 081210: optical observations
  12. Possible GRB 081211B - Swift-XRT analysis
  13. GRB 081207: Fermi GBM detection
  14. GRB 081209: Fermi GBM detection
  15. Fermi Gamma-ray Burst Monitor trigger 250533995 is not a GRB
  16. GRB 081007: Detection of a Supernova
  17. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  18. GRB 081210: Xinglong TNT R band Upper Limits
  19. GRB 081210, SMARTS optical/IR observations
  20. GRB 081211: Swift-BAT refined analysis
  21. GRB 081211: Swift XRT refined analysis
  22. GRB 081211: Swift/UVOT detection of an optical afterglow
  23. GRB 081211: Enhanced Swift-XRT position
  24. GRB 081210: Swift/UVOT refined analysis
  25. GRB 081211: Swift detection of a burst
  26. GRB 081210: Swift-XRT refined analysis
  27. GRB081203B: optical observations
  28. GRB 081210: Enhanced Swift-XRT position
  29. GRB 081210: Swift-BAT refined analysis
  30. GRB 081210: Swift detection of a burst with optical afterglow
  31. Konus-Wind observation of GRB 081209
  32. IPN triangulation of short hard GRB 081209
  33. GRB 081203A: optical observations
  34. GRB 081206C: Fermi GBM detection
  35. Radio observation of GRB 081121 with ATCA
  36. Radio observation of GRB 081118 with ATCA
  37. GRB 081206B: Fermi GBM detection
  38. GRB 081206: Fermi GBM detection
  39. GRB 081128: afterglow observations
  40. GRB 081203B: Suzaku WAM observation of the prompt emission
  41. GRB 081203B: Additional Gemini imaging
  42. Radio observation of GRB 081109 with ATCA
  43. Radio observation of GRB 081104 with ATCA
  44. Radio observation of GRB 081029 with ATCA
  45. Radio observation of GRB 081008 with ATCA
  46. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  47. GRB 081203B: Gemini observations
  48. GRB 081128: optical observation in CrAO
  49. GRB081203A: Optical observations at Ishigaki
  50. GRB 081128: Optical afterglow observations
  51. GRB 081204: GROND Observations
  52. GRB081203B: optical observations
  53. Radio detection of GRB 081203B with the VLA
  54. GRB 081204: Magellan observations
  55. GRB081203A: Radio upper limit at 15 GHz
  56. GRB 081204B: Fermi GBM detection
  57. GRB 081204: Swift/UVOT Upper Limits
  58. GRB 081204: Swift XRT afterglow confirmation
  59. GRB081203A: MITSuME optical observation
  60. GRB 081203A: Optical observations of Xinglong TNT telescope
  61. GRB 081203A: Skynet/GORT Detections
  62. GRB 081204: Swift XRT afterglow candidate
  63. GRB081203A: optical observation
  64. GRB 081204 : a long GRB localized by INTEGRAL
  65. VLA Radio upper limit on GRB 081203A
  66. Swift-XRT observations of GRB 081203B
  67. Konus-Wind observation of GRB 081203A
  68. Konus-Wind observation of GRB 081203B
  69. GRB081203A: Swift-XRT refined analysis
  70. GRB 081203B: optical observations
  71. GRB 081203B: SDSS upper limits at the position of the optical afterglow
  72. Swift/UVOT detection of GRB081203B
  73. GRB 081203B: Swift-XRT candidate afterglow.
  74. GRB 081203A: optical observations
  75. Swift UVOT observations of GRB 081203A
  76. GRB 081203B: Naming correction for burst detected in Swift-BAT slew data
  77. GRB081203A: Swift/UVOT grism redshift
  78. GRB 081203A: Burst detection from Swift-BAT slew data
  79. GRB 081203A: Swift-BAT refined analysis
  80. GRB 081203: Enhanced Swift-XRT position
  81. GRB 081130B: MASTER prompt optical observations
  82. GRB081203: optical observation
  83. GRB 081203: Swift detection of a burst with a bright optical counterpart
  84. GRB 081128: optical observation
  85. GRB 081130B: Fermi GBM detection
  86. GRB 081130: Fermi GBM detection
  87. Swift Trigger 335971: Swift/UVOT Observations
  88. GRB 081126: afterglow photometry
  89. GRB 081126: Fermi GBM detection
  90. Fermi Gamma-ray Burst Monitor trigger 249166723 reclassification
  91. VLA Radio upper limit on GRB 081126
  92. GRB 081129: Fermi GBM detection
  93. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  94. GRB 081128A: optical observations
  95. Swift Trigger 335971 is probably not a real source
  96. Trigger 335971: Swift possible detection of a burst
  97. GRB081128: Swift/UVOT Upper Limits
  98. SGR 1806-20: Fermi GBM detection.
  99. GRB 081122B: Fermi GBM Detection
  100. GRB 081128: Swift-XRT refined analysis

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