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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"

28238 results found.

  1. GRB 081226A: Swift-BAT refined analysis
  2. GRB 081226: GROND afterglow candidate
  3. GRB 081226: ROTSE-III Optical Limits
  4. GRB 081226: Swift detection of a possible short-hard burst
  5. GRB 080810: optical observations
  6. GRB 081211B: optical observations
  7. GRB 081224: Swift-XRT observation
  8. GRB 081222: MITSuME optical observation
  9. GRB 081224: Fermi GBM Detection & LAT Localization
  10. GRB 080810: optical observations
  11. Konus-Wind observation of GRB 081222
  12. GRB 081223: Fermi GBM detection
  13. GRB 081221: GROND observations
  14. VLA radio upper limit on GRB 081222
  15. GRB 081222: Fermi GBM observation
  16. GRB 081221: Probable host galaxy in Keck imaging
  17. GRB 081204C: Fermi GBM detection
  18. GRB 081222, Swift-BAT refined analysis
  19. GRB 081221, Swift-BAT refined analysis
  20. GRB081222 optical limit by "Pi of the Sky"
  21. GRB 081222: Swift XRT refined analysis
  22. GRB081221: Fermi GBM observation
  23. IPN triangulation of bright GRB 081215A
  24. GRB 081222: Faulkes Telescope South observations
  25. GRB 081221: Gemini-N nIR imaging
  26. GRB081222, optical observation
  27. GRB081203A: BTA observation
  28. Konus-Wind observation of GRB 081221
  29. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  30. GRB081222: REM candidate afterglow
  31. GRB 081222: Swift detection of a burst with a bright optical afterglow
  32. GRB 081221: Enhanced Swift-XRT position
  33. GRB 081221: further NOT observations
  34. GRB 081221: NOT observations
  35. GRB 081221: Swift detection of a burst
  36. GRB 081217: Fermi GBM detection
  37. GRB 081211B: Further Swift-XRT analysis
  38. GRB 081215B: Fermi GBM detection
  39. GRB 081216: Suzaku WAM observation of the prompt emission
  40. GRB 081216 : Fermi GBM observation
  41. GRB 081215A: Fermi GBM detection
  42. GRB 081118: Zadko observations
  43. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  44. GRB 0811215A: MASTER prompt optical observations
  45. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  46. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  47. Possible GRB 081211B: Swift/UVOT Upper Limits
  48. GRB 081213: Fermi GBM detection
  49. Possible GRB 081211B - Swift-XRT analysis
  50. GRB 081207: Fermi GBM detection
  51. GRB 081209: Fermi GBM detection
  52. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  53. GRB 081210, SMARTS optical/IR observations
  54. GRB 081211: Swift-BAT refined analysis
  55. GRB 081211: Swift XRT refined analysis
  56. GRB 081211: Enhanced Swift-XRT position
  57. GRB 081211: Swift detection of a burst
  58. GRB 081210: Swift-XRT refined analysis
  59. GRB081203B: optical observations
  60. GRB 081210: Enhanced Swift-XRT position
  61. GRB 081210: Swift-BAT refined analysis
  62. GRB 081210: Swift detection of a burst with optical afterglow
  63. IPN triangulation of short hard GRB 081209
  64. GRB 081203A: optical observations
  65. GRB 081206C: Fermi GBM detection
  66. Radio observation of GRB 081121 with ATCA
  67. Radio observation of GRB 081118 with ATCA
  68. GRB 081206B: Fermi GBM detection
  69. GRB 081206: Fermi GBM detection
  70. GRB 081128: afterglow observations
  71. GRB 081203B: Suzaku WAM observation of the prompt emission
  72. Radio observation of GRB 081109 with ATCA
  73. Radio observation of GRB 081104 with ATCA
  74. Radio observation of GRB 081029 with ATCA
  75. Radio observation of GRB 081008 with ATCA
  76. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  77. GRB081203A: Optical observations at Ishigaki
  78. GRB 081204: GROND Observations
  79. Radio detection of GRB 081203B with the VLA
  80. GRB081203A: Radio upper limit at 15 GHz
  81. GRB 081204B: Fermi GBM detection
  82. GRB 081204: Swift/UVOT Upper Limits
  83. GRB 081204: Swift XRT afterglow confirmation
  84. GRB081203A: MITSuME optical observation
  85. GRB081203A: optical observation
  86. GRB 081204 : a long GRB localized by INTEGRAL
  87. VLA Radio upper limit on GRB 081203A
  88. Swift-XRT observations of GRB 081203B
  89. GRB081203A: Swift-XRT refined analysis
  90. GRB 081203B: optical observations
  91. Swift/UVOT detection of GRB081203B
  92. GRB 081203B: Swift-XRT candidate afterglow.
  93. GRB 081203A: optical observations
  94. GRB081203A: Swift/UVOT grism redshift
  95. GRB 081203A: Burst detection from Swift-BAT slew data
  96. GRB 081203A: Swift-BAT refined analysis
  97. GRB 081203: Enhanced Swift-XRT position
  98. GRB 081130B: MASTER prompt optical observations
  99. GRB081203: optical observation
  100. GRB 081203: Swift detection of a burst with a bright optical counterpart

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