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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"

27320 results found.

  1. GRB 081221, Swift-BAT refined analysis
  2. GRB081222 optical limit by "Pi of the Sky"
  3. GRB 081222: Swift XRT refined analysis
  4. GRB081221: Fermi GBM observation
  5. IPN triangulation of bright GRB 081215A
  6. GRB 081222: Faulkes Telescope South observations
  7. GRB 081221: Gemini-N nIR imaging
  8. GRB081222, optical observation
  9. GRB081203A: BTA observation
  10. Konus-Wind observation of GRB 081221
  11. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  12. GRB081222: REM candidate afterglow
  13. GRB 081222: Swift detection of a burst with a bright optical afterglow
  14. GRB 081221: Enhanced Swift-XRT position
  15. GRB 081221: further NOT observations
  16. GRB 081221: NOT observations
  17. GRB 081221: Swift detection of a burst
  18. GRB 081217: Fermi GBM detection
  19. GRB 081211B: Further Swift-XRT analysis
  20. GRB 081215B: Fermi GBM detection
  21. GRB 081216: Suzaku WAM observation of the prompt emission
  22. GRB 081216 : Fermi GBM observation
  23. GRB 081215A: Fermi GBM detection
  24. GRB 081118: Zadko observations
  25. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  26. GRB 0811215A: MASTER prompt optical observations
  27. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  28. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  29. Possible GRB 081211B: Swift/UVOT Upper Limits
  30. GRB 081213: Fermi GBM detection
  31. Possible GRB 081211B - Swift-XRT analysis
  32. GRB 081207: Fermi GBM detection
  33. GRB 081209: Fermi GBM detection
  34. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  35. GRB 081210, SMARTS optical/IR observations
  36. GRB 081211: Swift-BAT refined analysis
  37. GRB 081211: Swift XRT refined analysis
  38. GRB 081211: Enhanced Swift-XRT position
  39. GRB 081211: Swift detection of a burst
  40. GRB 081210: Swift-XRT refined analysis
  41. GRB081203B: optical observations
  42. GRB 081210: Enhanced Swift-XRT position
  43. GRB 081210: Swift-BAT refined analysis
  44. GRB 081210: Swift detection of a burst with optical afterglow
  45. IPN triangulation of short hard GRB 081209
  46. GRB 081203A: optical observations
  47. GRB 081206C: Fermi GBM detection
  48. Radio observation of GRB 081121 with ATCA
  49. Radio observation of GRB 081118 with ATCA
  50. GRB 081206B: Fermi GBM detection
  51. GRB 081206: Fermi GBM detection
  52. GRB 081128: afterglow observations
  53. GRB 081203B: Suzaku WAM observation of the prompt emission
  54. Radio observation of GRB 081109 with ATCA
  55. Radio observation of GRB 081104 with ATCA
  56. Radio observation of GRB 081029 with ATCA
  57. Radio observation of GRB 081008 with ATCA
  58. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  59. GRB081203A: Optical observations at Ishigaki
  60. GRB 081204: GROND Observations
  61. Radio detection of GRB 081203B with the VLA
  62. GRB081203A: Radio upper limit at 15 GHz
  63. GRB 081204B: Fermi GBM detection
  64. GRB 081204: Swift/UVOT Upper Limits
  65. GRB 081204: Swift XRT afterglow confirmation
  66. GRB081203A: MITSuME optical observation
  67. GRB081203A: optical observation
  68. GRB 081204 : a long GRB localized by INTEGRAL
  69. VLA Radio upper limit on GRB 081203A
  70. Swift-XRT observations of GRB 081203B
  71. GRB081203A: Swift-XRT refined analysis
  72. GRB 081203B: optical observations
  73. Swift/UVOT detection of GRB081203B
  74. GRB 081203B: Swift-XRT candidate afterglow.
  75. GRB 081203A: optical observations
  76. GRB081203A: Swift/UVOT grism redshift
  77. GRB 081203A: Burst detection from Swift-BAT slew data
  78. GRB 081203A: Swift-BAT refined analysis
  79. GRB 081203: Enhanced Swift-XRT position
  80. GRB 081130B: MASTER prompt optical observations
  81. GRB081203: optical observation
  82. GRB 081203: Swift detection of a burst with a bright optical counterpart
  83. GRB 081130B: Fermi GBM detection
  84. GRB 081130: Fermi GBM detection
  85. Swift Trigger 335971: Swift/UVOT Observations
  86. GRB 081126: afterglow photometry
  87. GRB 081126: Fermi GBM detection
  88. VLA Radio upper limit on GRB 081126
  89. GRB 081129: Fermi GBM detection
  90. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  91. GRB 081128A: optical observations
  92. Trigger 335971: Swift possible detection of a burst
  93. GRB081128: Swift/UVOT Upper Limits
  94. GRB 081122B: Fermi GBM Detection
  95. GRB 081128: Swift-XRT refined analysis
  96. GRB 081128: Liverpool Telescope afterglow confirmation
  97. GRB081128: optical observations
  98. GRB 081128: Swift-BAT refined analysis
  99. GRB 081128: Enhanced Swift-XRT position
  100. GRB 081128: Optical observation of xinglong TNT

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