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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"

32769 results found.

  1. GRB 090113: ROTSE-III Optical Limits
  2. GRB090113: XRT position
  3. GRB 090111, Swift-BAT refined analysis
  4. GRB 090111: Swift UVOT Upper Limits
  5. GRB 090111: Swift-XRT refined analysis
  6. GRB 090107B: Suzaku WAM observation of the prompt emission
  7. GRB090107B: Fermi GBM Detection
  8. GRB 090102: WSRT Radio Observations
  9. GRB 090107B: Swift XRT afterglow confirmation
  10. GRB 090107B: Swift/UVOT Observations
  11. GRB 090107B: Swift-XRT detection of possible afterglow
  12. GRB 090107B optical observations
  13. GRB 090107B: ROTSE-III Optical Limits
  14. Fermi/GBM detection of GRB 081226A
  15. GRB 090107: Swift-BAT refined analysis
  16. GRB 090102: optical decay
  17. VLA radio upper limit on GRB 090102
  18. GRB 090102: GRT Optical Observation
  19. Konus-Wind observation of GRB 090102
  20. GRB 090102: Hobby-Eberly Telescope Spectroscopy
  21. GRB 090102: P60 Imaging and P200 Spectroscopy
  22. GRB 090102 Observations from IAC80
  23. GRB 090102: GROND observations of the optical afterglow
  24. Swift UVOT observations of GRB 090102
  25. GRB 090102: Swift-BAT refined analysis
  26. GRB 090102: Swift XRT refined analysis
  27. GRB 090102: NOT redshift
  28. GRB 090102: TAROT Calern observatory optical light curve
  29. GRB 090102: REM observations of a bright afterglow
  30. GRB 081230: GROND confirmation of the afterglow
  31. GRB 081230, Swift-BAT refined analysis
  32. GRB081230: Swift-XRT refined analysis
  33. GRB 081230 Swift/UVOT Observations
  34. GRB 081230: Swift/UVOT Detection of an Optical Afterglow
  35. GRB 081230: ROTSE-III Detection of Optical Counterpart
  36. GRB 081228: GROND confirmation of the optical/NIR afterglow
  37. GRB 081226B: Fermi GBM observation
  38. GRB 081228, Swift-BAT refined analysis
  39. VLA radio detection of GRB 081221
  40. GRB 081228: Swift/UVOT Upper Limits
  41. GRB 081228: Swift-XRT Team refined analysis
  42. GRB 081228: detection by GROND
  43. VLA radio observation of GRB 081221
  44. GRB 081226B: Swift XRT and UVOT upper limits
  45. GRB 081224: Suzaku WAM observation of the prompt emission
  46. GRB 081226: Swift-XRT refined analysis
  47. GRB 081226A: Swift UVOT Upper Limits
  48. GRB 081226: Second epoch of Gemini-South imaging
  49. GRB 081226A: Swift-BAT refined analysis
  50. GRB 081226: Gemini-South imaging
  51. GRB 081226: GROND afterglow candidate
  52. GRB 081226: ROTSE-III Optical Limits
  53. GRB 080810: optical observations
  54. GRB 081211B: optical observations
  55. GRB081224: LAT retraction
  56. GRB 081224: Swift-XRT observation
  57. GRB 081222: MITSuME optical observation
  58. GRB 080810: optical observations
  59. Konus-Wind observation of GRB 081222
  60. GRB 081221: GROND observations
  61. GRB 081222: Gemini-N confirmation of redshift z=2.77
  62. GRB 081222:Optical afterglow observation
  63. VLA radio upper limit on GRB 081222
  64. GRB 081222: Fermi GBM observation
  65. GRB 081222: Gemini-South absorption redshift
  66. GRB081222: Swift/UVOT further observations
  67. GRB 081221: Probable host galaxy in Keck imaging
  68. GRB 081222, Swift-BAT refined analysis
  69. GRB 081221, Swift-BAT refined analysis
  70. Konus-Wind observation of very bright GRB 081215A
  71. GRB 081222: Swift XRT refined analysis
  72. GRB081221: Fermi GBM observation
  73. Swift/UVOT observations of GRB 081221
  74. IPN triangulation of bright GRB 081215A
  75. GRB 081221: Swift-XRT Refined Analysis
  76. GRB 081221: pseudo-redshift (pz=0.7) from the spectral parameters of the prompt emission
  77. GRB 081222: Faulkes Telescope South observations
  78. GRB 081221: Gemini-N nIR imaging
  79. GRB081222, optical observation
  80. GRB081222: Swift/UVOT detection of an optical afterglow
  81. GRB081203A: BTA observation
  82. Konus-Wind observation of GRB 081221
  83. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  84. GRB 081221: further NOT observations
  85. GRB 081221: NOT observations
  86. GRB 081211B: Further Swift-XRT analysis
  87. GRB 081216: Suzaku WAM observation of the prompt emission
  88. GRB 081216 : Fermi GBM observation
  89. GRB 081215A: Fermi GBM detection
  90. GRB 081211B - possibly a short burst with extended emission
  91. GRB 081118: Zadko observations
  92. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  93. GRB 081215A: Gamma Repeater?
  94. Possible GRB 081211B: Swift/UVOT Upper Limits
  95. GRB 081210: optical observations
  96. Possible GRB 081211B - Swift-XRT analysis
  97. GRB 081209: Fermi GBM detection
  98. GRB 081007: Detection of a Supernova
  99. GRB 081210: Xinglong TNT R band Upper Limits
  100. GRB 081210, SMARTS optical/IR observations

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