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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"

28046 results found.

  1. GRB 081228: Enhanced Swift-XRT position
  2. GRB 081228: TAROT Calern observatory optical observations
  3. GRB 081228: Swift detection of a burst
  4. VLA radio observation of GRB 081221
  5. GRB 081226B: Swift XRT and UVOT upper limits
  6. GRB 081224: Suzaku WAM observation of the prompt emission
  7. GRB 081226: Swift-XRT refined analysis
  8. GRB 081226A: Swift UVOT Upper Limits
  9. GRB 081226A: Swift-BAT refined analysis
  10. GRB 081226: GROND afterglow candidate
  11. GRB 081226: ROTSE-III Optical Limits
  12. GRB 081226: Swift detection of a possible short-hard burst
  13. GRB 080810: optical observations
  14. GRB 081211B: optical observations
  15. GRB 081224: Swift-XRT observation
  16. GRB 081222: MITSuME optical observation
  17. GRB 081224: Fermi GBM Detection & LAT Localization
  18. GRB 080810: optical observations
  19. Konus-Wind observation of GRB 081222
  20. GRB 081223: Fermi GBM detection
  21. GRB 081221: GROND observations
  22. VLA radio upper limit on GRB 081222
  23. GRB 081222: Fermi GBM observation
  24. GRB 081221: Probable host galaxy in Keck imaging
  25. GRB 081204C: Fermi GBM detection
  26. GRB 081222, Swift-BAT refined analysis
  27. GRB 081221, Swift-BAT refined analysis
  28. GRB081222 optical limit by "Pi of the Sky"
  29. GRB 081222: Swift XRT refined analysis
  30. GRB081221: Fermi GBM observation
  31. IPN triangulation of bright GRB 081215A
  32. GRB 081222: Faulkes Telescope South observations
  33. GRB 081221: Gemini-N nIR imaging
  34. GRB081222, optical observation
  35. GRB081203A: BTA observation
  36. Konus-Wind observation of GRB 081221
  37. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  38. GRB081222: REM candidate afterglow
  39. GRB 081222: Swift detection of a burst with a bright optical afterglow
  40. GRB 081221: Enhanced Swift-XRT position
  41. GRB 081221: further NOT observations
  42. GRB 081221: NOT observations
  43. GRB 081221: Swift detection of a burst
  44. GRB 081217: Fermi GBM detection
  45. GRB 081211B: Further Swift-XRT analysis
  46. GRB 081215B: Fermi GBM detection
  47. GRB 081216: Suzaku WAM observation of the prompt emission
  48. GRB 081216 : Fermi GBM observation
  49. GRB 081215A: Fermi GBM detection
  50. GRB 081118: Zadko observations
  51. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  52. GRB 0811215A: MASTER prompt optical observations
  53. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  54. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  55. Possible GRB 081211B: Swift/UVOT Upper Limits
  56. GRB 081213: Fermi GBM detection
  57. Possible GRB 081211B - Swift-XRT analysis
  58. GRB 081207: Fermi GBM detection
  59. GRB 081209: Fermi GBM detection
  60. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  61. GRB 081210, SMARTS optical/IR observations
  62. GRB 081211: Swift-BAT refined analysis
  63. GRB 081211: Swift XRT refined analysis
  64. GRB 081211: Enhanced Swift-XRT position
  65. GRB 081211: Swift detection of a burst
  66. GRB 081210: Swift-XRT refined analysis
  67. GRB081203B: optical observations
  68. GRB 081210: Enhanced Swift-XRT position
  69. GRB 081210: Swift-BAT refined analysis
  70. GRB 081210: Swift detection of a burst with optical afterglow
  71. IPN triangulation of short hard GRB 081209
  72. GRB 081203A: optical observations
  73. GRB 081206C: Fermi GBM detection
  74. Radio observation of GRB 081121 with ATCA
  75. Radio observation of GRB 081118 with ATCA
  76. GRB 081206B: Fermi GBM detection
  77. GRB 081206: Fermi GBM detection
  78. GRB 081128: afterglow observations
  79. GRB 081203B: Suzaku WAM observation of the prompt emission
  80. Radio observation of GRB 081109 with ATCA
  81. Radio observation of GRB 081104 with ATCA
  82. Radio observation of GRB 081029 with ATCA
  83. Radio observation of GRB 081008 with ATCA
  84. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  85. GRB081203A: Optical observations at Ishigaki
  86. GRB 081204: GROND Observations
  87. Radio detection of GRB 081203B with the VLA
  88. GRB081203A: Radio upper limit at 15 GHz
  89. GRB 081204B: Fermi GBM detection
  90. GRB 081204: Swift/UVOT Upper Limits
  91. GRB 081204: Swift XRT afterglow confirmation
  92. GRB081203A: MITSuME optical observation
  93. GRB081203A: optical observation
  94. GRB 081204 : a long GRB localized by INTEGRAL
  95. VLA Radio upper limit on GRB 081203A
  96. Swift-XRT observations of GRB 081203B
  97. GRB081203A: Swift-XRT refined analysis
  98. GRB 081203B: optical observations
  99. Swift/UVOT detection of GRB081203B
  100. GRB 081203B: Swift-XRT candidate afterglow.

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