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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"

32754 results found.

  1. GRB 090102: optical decay
  2. VLA radio upper limit on GRB 090102
  3. GRB 090102: GRT Optical Observation
  4. Konus-Wind observation of GRB 090102
  5. GRB 090102: Hobby-Eberly Telescope Spectroscopy
  6. GRB 090102: P60 Imaging and P200 Spectroscopy
  7. GRB 090102 Observations from IAC80
  8. GRB 090102: GROND observations of the optical afterglow
  9. Swift UVOT observations of GRB 090102
  10. GRB 090102: Swift-BAT refined analysis
  11. GRB 090102: Swift XRT refined analysis
  12. GRB 090102: NOT redshift
  13. GRB 090102: TAROT Calern observatory optical light curve
  14. GRB 090102: REM observations of a bright afterglow
  15. GRB 081230: GROND confirmation of the afterglow
  16. GRB 081230, Swift-BAT refined analysis
  17. GRB081230: Swift-XRT refined analysis
  18. GRB 081230 Swift/UVOT Observations
  19. GRB 081230: Swift/UVOT Detection of an Optical Afterglow
  20. GRB 081230: ROTSE-III Detection of Optical Counterpart
  21. GRB 081228: GROND confirmation of the optical/NIR afterglow
  22. GRB 081226B: Fermi GBM observation
  23. GRB 081228, Swift-BAT refined analysis
  24. VLA radio detection of GRB 081221
  25. GRB 081228: Swift/UVOT Upper Limits
  26. GRB 081228: Swift-XRT Team refined analysis
  27. GRB 081228: detection by GROND
  28. VLA radio observation of GRB 081221
  29. GRB 081226B: Swift XRT and UVOT upper limits
  30. GRB 081224: Suzaku WAM observation of the prompt emission
  31. GRB 081226: Swift-XRT refined analysis
  32. GRB 081226A: Swift UVOT Upper Limits
  33. GRB 081226: Second epoch of Gemini-South imaging
  34. GRB 081226A: Swift-BAT refined analysis
  35. GRB 081226: Gemini-South imaging
  36. GRB 081226: GROND afterglow candidate
  37. GRB 081226: ROTSE-III Optical Limits
  38. GRB 080810: optical observations
  39. GRB 081211B: optical observations
  40. GRB081224: LAT retraction
  41. GRB 081224: Swift-XRT observation
  42. GRB 081222: MITSuME optical observation
  43. GRB 080810: optical observations
  44. Konus-Wind observation of GRB 081222
  45. GRB 081221: GROND observations
  46. GRB 081222: Gemini-N confirmation of redshift z=2.77
  47. GRB 081222:Optical afterglow observation
  48. VLA radio upper limit on GRB 081222
  49. GRB 081222: Fermi GBM observation
  50. GRB 081222: Gemini-South absorption redshift
  51. GRB081222: Swift/UVOT further observations
  52. GRB 081221: Probable host galaxy in Keck imaging
  53. GRB 081222, Swift-BAT refined analysis
  54. GRB 081221, Swift-BAT refined analysis
  55. Konus-Wind observation of very bright GRB 081215A
  56. GRB 081222: Swift XRT refined analysis
  57. GRB081221: Fermi GBM observation
  58. Swift/UVOT observations of GRB 081221
  59. IPN triangulation of bright GRB 081215A
  60. GRB 081221: Swift-XRT Refined Analysis
  61. GRB 081221: pseudo-redshift (pz=0.7) from the spectral parameters of the prompt emission
  62. GRB 081222: Faulkes Telescope South observations
  63. GRB 081221: Gemini-N nIR imaging
  64. GRB081222, optical observation
  65. GRB081222: Swift/UVOT detection of an optical afterglow
  66. GRB081203A: BTA observation
  67. Konus-Wind observation of GRB 081221
  68. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  69. GRB 081221: further NOT observations
  70. GRB 081221: NOT observations
  71. GRB 081211B: Further Swift-XRT analysis
  72. GRB 081216: Suzaku WAM observation of the prompt emission
  73. GRB 081216 : Fermi GBM observation
  74. GRB 081215A: Fermi GBM detection
  75. GRB 081211B - possibly a short burst with extended emission
  76. GRB 081118: Zadko observations
  77. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  78. GRB 081215A: Gamma Repeater?
  79. Possible GRB 081211B: Swift/UVOT Upper Limits
  80. GRB 081210: optical observations
  81. Possible GRB 081211B - Swift-XRT analysis
  82. GRB 081209: Fermi GBM detection
  83. GRB 081007: Detection of a Supernova
  84. GRB 081210: Xinglong TNT R band Upper Limits
  85. GRB 081210, SMARTS optical/IR observations
  86. GRB 081211: Swift-BAT refined analysis
  87. GRB 081211: Swift XRT refined analysis
  88. GRB 081211: Swift/UVOT detection of an optical afterglow
  89. GRB 081210: Swift/UVOT refined analysis
  90. GRB 081210: Swift-XRT refined analysis
  91. GRB081203B: optical observations
  92. GRB 081210: Swift-BAT refined analysis
  93. Konus-Wind observation of GRB 081209
  94. GRB 081203A: optical observations
  95. Radio observation of GRB 081121 with ATCA
  96. Radio observation of GRB 081118 with ATCA
  97. GRB 081128: afterglow observations
  98. GRB 081203B: Suzaku WAM observation of the prompt emission
  99. GRB 081203B: Additional Gemini imaging
  100. Radio observation of GRB 081109 with ATCA

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