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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"

26329 results found.

  1. GRB 080810: optical observations
  2. Konus-Wind observation of GRB 081222
  3. GRB 081223: Fermi GBM detection
  4. GRB 081221: GROND observations
  5. VLA radio upper limit on GRB 081222
  6. GRB 081222: Fermi GBM observation
  7. GRB 081221: Probable host galaxy in Keck imaging
  8. GRB 081204C: Fermi GBM detection
  9. GRB 081222, Swift-BAT refined analysis
  10. GRB 081221, Swift-BAT refined analysis
  11. GRB081222 optical limit by "Pi of the Sky"
  12. GRB 081222: Swift XRT refined analysis
  13. GRB081221: Fermi GBM observation
  14. IPN triangulation of bright GRB 081215A
  15. GRB 081222: Faulkes Telescope South observations
  16. GRB 081221: Gemini-N nIR imaging
  17. GRB081222, optical observation
  18. GRB081203A: BTA observation
  19. Konus-Wind observation of GRB 081221
  20. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  21. GRB081222: REM candidate afterglow
  22. GRB 081222: Swift detection of a burst with a bright optical afterglow
  23. GRB 081221: Enhanced Swift-XRT position
  24. GRB 081221: further NOT observations
  25. GRB 081221: NOT observations
  26. GRB 081221: Swift detection of a burst
  27. GRB 081217: Fermi GBM detection
  28. GRB 081211B: Further Swift-XRT analysis
  29. GRB 081215B: Fermi GBM detection
  30. GRB 081216: Suzaku WAM observation of the prompt emission
  31. GRB 081216 : Fermi GBM observation
  32. GRB 081215A: Fermi GBM detection
  33. GRB 081118: Zadko observations
  34. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  35. GRB 0811215A: MASTER prompt optical observations
  36. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  37. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  38. Possible GRB 081211B: Swift/UVOT Upper Limits
  39. GRB 081213: Fermi GBM detection
  40. Possible GRB 081211B - Swift-XRT analysis
  41. GRB 081207: Fermi GBM detection
  42. GRB 081209: Fermi GBM detection
  43. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  44. GRB 081210, SMARTS optical/IR observations
  45. GRB 081211: Swift-BAT refined analysis
  46. GRB 081211: Swift XRT refined analysis
  47. GRB 081211: Enhanced Swift-XRT position
  48. GRB 081211: Swift detection of a burst
  49. GRB 081210: Swift-XRT refined analysis
  50. GRB081203B: optical observations
  51. GRB 081210: Enhanced Swift-XRT position
  52. GRB 081210: Swift-BAT refined analysis
  53. GRB 081210: Swift detection of a burst with optical afterglow
  54. IPN triangulation of short hard GRB 081209
  55. GRB 081203A: optical observations
  56. GRB 081206C: Fermi GBM detection
  57. Radio observation of GRB 081121 with ATCA
  58. Radio observation of GRB 081118 with ATCA
  59. GRB 081206B: Fermi GBM detection
  60. GRB 081206: Fermi GBM detection
  61. GRB 081128: afterglow observations
  62. GRB 081203B: Suzaku WAM observation of the prompt emission
  63. Radio observation of GRB 081109 with ATCA
  64. Radio observation of GRB 081104 with ATCA
  65. Radio observation of GRB 081029 with ATCA
  66. Radio observation of GRB 081008 with ATCA
  67. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  68. GRB081203A: Optical observations at Ishigaki
  69. GRB 081204: GROND Observations
  70. Radio detection of GRB 081203B with the VLA
  71. GRB081203A: Radio upper limit at 15 GHz
  72. GRB 081204B: Fermi GBM detection
  73. GRB 081204: Swift/UVOT Upper Limits
  74. GRB 081204: Swift XRT afterglow confirmation
  75. GRB081203A: MITSuME optical observation
  76. GRB081203A: optical observation
  77. GRB 081204 : a long GRB localized by INTEGRAL
  78. VLA Radio upper limit on GRB 081203A
  79. Swift-XRT observations of GRB 081203B
  80. GRB081203A: Swift-XRT refined analysis
  81. GRB 081203B: optical observations
  82. Swift/UVOT detection of GRB081203B
  83. GRB 081203B: Swift-XRT candidate afterglow.
  84. GRB 081203A: optical observations
  85. GRB081203A: Swift/UVOT grism redshift
  86. GRB 081203A: Burst detection from Swift-BAT slew data
  87. GRB 081203A: Swift-BAT refined analysis
  88. GRB 081203: Enhanced Swift-XRT position
  89. GRB 081130B: MASTER prompt optical observations
  90. GRB081203: optical observation
  91. GRB 081203: Swift detection of a burst with a bright optical counterpart
  92. GRB 081130B: Fermi GBM detection
  93. GRB 081130: Fermi GBM detection
  94. Swift Trigger 335971: Swift/UVOT Observations
  95. GRB 081126: afterglow photometry
  96. GRB 081126: Fermi GBM detection
  97. VLA Radio upper limit on GRB 081126
  98. GRB 081129: Fermi GBM detection
  99. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  100. GRB 081128A: optical observations

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