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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"

19663 results found.

  1. GRB 090111: Swift-XRT refined analysis
  2. GRB 090111: Enhanced Swift-XRT position
  3. GRB 090111: Swift detection of a burst
  4. GRB 090107B: Swift XRT afterglow confirmation
  5. GRB 090107B: Swift/UVOT Observations
  6. GRB 090107B: Swift-XRT detection of possible afterglow
  7. Fermi/GBM detection of GRB 081226A
  8. GRB 090107: Swift-BAT refined analysis
  9. GRB 090107: Swift detection of a burst
  10. VLA radio upper limit on GRB 090102
  11. GRB 090102: GRT Optical Observation
  12. Swift triggered on the HMXB 1A 1118-61
  13. Konus-Wind observation of GRB 090102
  14. Swift UVOT observations of GRB 090102
  15. GRB 090102: Swift-BAT refined analysis
  16. GRB 090102: Swift burst of interest
  17. GRB 090102: Swift XRT refined analysis
  18. GRB 090102: Enhanced Swift-XRT position
  19. GRB 090102: TAROT Calern observatory optical light curve
  20. GRB 090102: Swift detection of a burst with an optical counterpart
  21. GRB 090102: TAROT Calern observatory optical observations
  22. GRB 081230: GROND confirmation of the afterglow
  23. GRB 081230, Swift-BAT refined analysis
  24. GRB081230: Swift-XRT refined analysis
  25. GRB 081230 Swift/UVOT Observations
  26. GRB 081230: Enhanced Swift-XRT position
  27. GRB 081230: Swift/UVOT Detection of an Optical Afterglow
  28. GRB 081230: ROTSE-III Detection of Optical Counterpart
  29. GRB 081230: Swift detection of a burst
  30. GRB 081228: GROND confirmation of the optical/NIR afterglow
  31. GRB 081228, Swift-BAT refined analysis
  32. GRB 081228: Swift/UVOT Upper Limits
  33. GRB 081228: Swift-XRT Team refined analysis
  34. GRB 081228: detection by GROND
  35. GRB 081228: Enhanced Swift-XRT position
  36. GRB 081228: TAROT Calern observatory optical observations
  37. GRB 081228: Swift detection of a burst
  38. GRB 081226B: Swift XRT and UVOT upper limits
  39. GRB 081226: Swift-XRT refined analysis
  40. GRB 081226A: Swift UVOT Upper Limits
  41. GRB 081226A: Swift-BAT refined analysis
  42. GRB 081226: ROTSE-III Optical Limits
  43. GRB 081226: Swift detection of a possible short-hard burst
  44. GRB 081224: Swift-XRT observation
  45. Konus-Wind observation of GRB 081222
  46. GRB 081221: GROND observations
  47. GRB 081222:Optical afterglow observation
  48. GRB 081222: Fermi GBM observation
  49. GRB081222: Swift/UVOT further observations
  50. GRB 081221: Probable host galaxy in Keck imaging
  51. GRB 081222, Swift-BAT refined analysis
  52. GRB 081221, Swift-BAT refined analysis
  53. GRB081222 optical limit by "Pi of the Sky"
  54. GRB 081222: Swift XRT refined analysis
  55. GRB081221: Fermi GBM observation
  56. Swift/UVOT observations of GRB 081221
  57. IPN triangulation of bright GRB 081215A
  58. GRB 081221: Swift-XRT Refined Analysis
  59. GRB 081221: pseudo-redshift (pz=0.7) from the spectral parameters of the prompt emission
  60. GRB081222, optical observation
  61. GRB081222: Swift/UVOT detection of an optical afterglow
  62. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  63. GRB 081222: Swift detection of a burst with a bright optical afterglow
  64. GRB 081221: Enhanced Swift-XRT position
  65. GRB 081221: Swift detection of a burst
  66. Modification of Swift/UVOT response to bright GRBs
  67. GRB 081211B: Further Swift-XRT analysis
  68. GRB 081211B - possibly a short burst with extended emission
  69. Possible GRB 081211B: Swift/UVOT Upper Limits
  70. GRB 081210: optical observations
  71. Possible GRB 081211B - Swift-XRT analysis
  72. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  73. GRB 081211: Swift-BAT refined analysis
  74. GRB 081211: Swift XRT refined analysis
  75. GRB 081211: Swift/UVOT detection of an optical afterglow
  76. GRB 081211: Enhanced Swift-XRT position
  77. GRB 081210: Swift/UVOT refined analysis
  78. GRB 081211: Swift detection of a burst
  79. GRB 081210: Swift-XRT refined analysis
  80. GRB 081210: Enhanced Swift-XRT position
  81. GRB 081210: Swift-BAT refined analysis
  82. GRB 081210: Swift detection of a burst with optical afterglow
  83. IPN triangulation of short hard GRB 081209
  84. Radio observation of GRB 081121 with ATCA
  85. GRB 081203B: Suzaku WAM observation of the prompt emission
  86. Radio observation of GRB 081029 with ATCA
  87. Radio observation of GRB 081008 with ATCA
  88. GRB081203A: Ashra-1 observation of early optical and VHE-neutrino emission
  89. GRB 081128: optical observation in CrAO
  90. GRB 081128: Optical afterglow observations
  91. GRB 081204: GROND Observations
  92. GRB 081204: Swift/UVOT Upper Limits
  93. GRB 081204: Swift XRT afterglow confirmation
  94. GRB 081204: Swift XRT afterglow candidate
  95. Swift-XRT observations of GRB 081203B
  96. Konus-Wind observation of GRB 081203A
  97. Konus-Wind observation of GRB 081203B
  98. GRB081203A: Swift-XRT refined analysis
  99. GRB 081203B: optical observations
  100. Swift/UVOT detection of GRB081203B

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