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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"

32764 results found.

  1. GRB 090107B: Suzaku WAM observation of the prompt emission
  2. GRB090107B: Fermi GBM Detection
  3. GRB 090102: WSRT Radio Observations
  4. GRB 090107B: Swift XRT afterglow confirmation
  5. GRB 090107B: Swift/UVOT Observations
  6. GRB 090107B: Swift-XRT detection of possible afterglow
  7. GRB 090107B optical observations
  8. GRB 090107B: ROTSE-III Optical Limits
  9. Fermi/GBM detection of GRB 081226A
  10. GRB 090107: Swift-BAT refined analysis
  11. GRB 090102: optical decay
  12. VLA radio upper limit on GRB 090102
  13. GRB 090102: GRT Optical Observation
  14. Konus-Wind observation of GRB 090102
  15. GRB 090102: Hobby-Eberly Telescope Spectroscopy
  16. GRB 090102: P60 Imaging and P200 Spectroscopy
  17. GRB 090102 Observations from IAC80
  18. GRB 090102: GROND observations of the optical afterglow
  19. Swift UVOT observations of GRB 090102
  20. GRB 090102: Swift-BAT refined analysis
  21. GRB 090102: Swift XRT refined analysis
  22. GRB 090102: NOT redshift
  23. GRB 090102: TAROT Calern observatory optical light curve
  24. GRB 090102: REM observations of a bright afterglow
  25. GRB 081230: GROND confirmation of the afterglow
  26. GRB 081230, Swift-BAT refined analysis
  27. GRB081230: Swift-XRT refined analysis
  28. GRB 081230 Swift/UVOT Observations
  29. GRB 081230: Swift/UVOT Detection of an Optical Afterglow
  30. GRB 081230: ROTSE-III Detection of Optical Counterpart
  31. GRB 081228: GROND confirmation of the optical/NIR afterglow
  32. GRB 081226B: Fermi GBM observation
  33. GRB 081228, Swift-BAT refined analysis
  34. VLA radio detection of GRB 081221
  35. GRB 081228: Swift/UVOT Upper Limits
  36. GRB 081228: Swift-XRT Team refined analysis
  37. GRB 081228: detection by GROND
  38. VLA radio observation of GRB 081221
  39. GRB 081226B: Swift XRT and UVOT upper limits
  40. GRB 081224: Suzaku WAM observation of the prompt emission
  41. GRB 081226: Swift-XRT refined analysis
  42. GRB 081226A: Swift UVOT Upper Limits
  43. GRB 081226: Second epoch of Gemini-South imaging
  44. GRB 081226A: Swift-BAT refined analysis
  45. GRB 081226: Gemini-South imaging
  46. GRB 081226: GROND afterglow candidate
  47. GRB 081226: ROTSE-III Optical Limits
  48. GRB 080810: optical observations
  49. GRB 081211B: optical observations
  50. GRB081224: LAT retraction
  51. GRB 081224: Swift-XRT observation
  52. GRB 081222: MITSuME optical observation
  53. GRB 080810: optical observations
  54. Konus-Wind observation of GRB 081222
  55. GRB 081221: GROND observations
  56. GRB 081222: Gemini-N confirmation of redshift z=2.77
  57. GRB 081222:Optical afterglow observation
  58. VLA radio upper limit on GRB 081222
  59. GRB 081222: Fermi GBM observation
  60. GRB 081222: Gemini-South absorption redshift
  61. GRB081222: Swift/UVOT further observations
  62. GRB 081221: Probable host galaxy in Keck imaging
  63. GRB 081222, Swift-BAT refined analysis
  64. GRB 081221, Swift-BAT refined analysis
  65. Konus-Wind observation of very bright GRB 081215A
  66. GRB 081222: Swift XRT refined analysis
  67. GRB081221: Fermi GBM observation
  68. Swift/UVOT observations of GRB 081221
  69. IPN triangulation of bright GRB 081215A
  70. GRB 081221: Swift-XRT Refined Analysis
  71. GRB 081221: pseudo-redshift (pz=0.7) from the spectral parameters of the prompt emission
  72. GRB 081222: Faulkes Telescope South observations
  73. GRB 081221: Gemini-N nIR imaging
  74. GRB081222, optical observation
  75. GRB081222: Swift/UVOT detection of an optical afterglow
  76. GRB081203A: BTA observation
  77. Konus-Wind observation of GRB 081221
  78. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  79. GRB 081221: further NOT observations
  80. GRB 081221: NOT observations
  81. GRB 081211B: Further Swift-XRT analysis
  82. GRB 081216: Suzaku WAM observation of the prompt emission
  83. GRB 081216 : Fermi GBM observation
  84. GRB 081215A: Fermi GBM detection
  85. GRB 081211B - possibly a short burst with extended emission
  86. GRB 081118: Zadko observations
  87. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  88. GRB 081215A: Gamma Repeater?
  89. Possible GRB 081211B: Swift/UVOT Upper Limits
  90. GRB 081210: optical observations
  91. Possible GRB 081211B - Swift-XRT analysis
  92. GRB 081209: Fermi GBM detection
  93. GRB 081007: Detection of a Supernova
  94. GRB 081210: Xinglong TNT R band Upper Limits
  95. GRB 081210, SMARTS optical/IR observations
  96. GRB 081211: Swift-BAT refined analysis
  97. GRB 081211: Swift XRT refined analysis
  98. GRB 081211: Swift/UVOT detection of an optical afterglow
  99. GRB 081210: Swift/UVOT refined analysis
  100. GRB 081210: Swift-XRT refined analysis

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