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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"

19664 results found.

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

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