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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"

19952 results found.

  1. Trigger 340734: Swift detection of a possible short burst
  2. AXP 1E1547.0-5408 activity with SGR bursts
  3. GRB 090118 (BATSS): GRT Optical Observation
  4. GRB 090118: Swift-XRT observations
  5. GRB090118 Swift/UVOT upper limits
  6. GRB 090118: GROND Upper Limits
  7. GRB 090118: Possible burst detection from Swift-BAT slew data
  8. GRB 090117: confirmation of the X-ray afterglow
  9. GRB 090117: GROND Upper Limits
  10. GRB090117 Swift/UVOT upper limits
  11. GRB090117: Swift-XRT detection of a possible candidate afterglow
  12. GRB 090113: Swift UVOT upper limits
  13. GRB 090113: GROND Upper Limits
  14. GRB 090113: Swift-XRT refined analysis
  15. GRB 090113: Enhanced Swift-XRT position
  16. GRB 090113: Swift-BAT refined analysis
  17. GRB 090113: ROTSE-III Optical Limits
  18. GRB090113: XRT position
  19. GRB 090113: Swift detection of a burst
  20. GRB 090111, Swift-BAT refined analysis
  21. GRB 090111: Swift UVOT Upper Limits
  22. GRB 090111: Swift-XRT refined analysis
  23. GRB 090111: Enhanced Swift-XRT position
  24. GRB 090111: Swift detection of a burst
  25. GRB 090107B: Swift XRT afterglow confirmation
  26. GRB 090107B: Swift/UVOT Observations
  27. GRB 090107B: Swift-XRT detection of possible afterglow
  28. Fermi/GBM detection of GRB 081226A
  29. GRB 090107: Swift-BAT refined analysis
  30. GRB 090107: Swift detection of a burst
  31. VLA radio upper limit on GRB 090102
  32. GRB 090102: GRT Optical Observation
  33. Swift triggered on the HMXB 1A 1118-61
  34. Konus-Wind observation of GRB 090102
  35. Swift UVOT observations of GRB 090102
  36. GRB 090102: Swift-BAT refined analysis
  37. GRB 090102: Swift burst of interest
  38. GRB 090102: Swift XRT refined analysis
  39. GRB 090102: Enhanced Swift-XRT position
  40. GRB 090102: TAROT Calern observatory optical light curve
  41. GRB 090102: Swift detection of a burst with an optical counterpart
  42. GRB 090102: TAROT Calern observatory optical observations
  43. GRB 081230: GROND confirmation of the afterglow
  44. GRB 081230, Swift-BAT refined analysis
  45. GRB081230: Swift-XRT refined analysis
  46. GRB 081230 Swift/UVOT Observations
  47. GRB 081230: Enhanced Swift-XRT position
  48. GRB 081230: Swift/UVOT Detection of an Optical Afterglow
  49. GRB 081230: ROTSE-III Detection of Optical Counterpart
  50. GRB 081230: Swift detection of a burst
  51. GRB 081228: GROND confirmation of the optical/NIR afterglow
  52. GRB 081228, Swift-BAT refined analysis
  53. GRB 081228: Swift/UVOT Upper Limits
  54. GRB 081228: Swift-XRT Team refined analysis
  55. GRB 081228: detection by GROND
  56. GRB 081228: Enhanced Swift-XRT position
  57. GRB 081228: TAROT Calern observatory optical observations
  58. GRB 081228: Swift detection of a burst
  59. GRB 081226B: Swift XRT and UVOT upper limits
  60. GRB 081226: Swift-XRT refined analysis
  61. GRB 081226A: Swift UVOT Upper Limits
  62. GRB 081226A: Swift-BAT refined analysis
  63. GRB 081226: ROTSE-III Optical Limits
  64. GRB 081226: Swift detection of a possible short-hard burst
  65. GRB 081224: Swift-XRT observation
  66. Konus-Wind observation of GRB 081222
  67. GRB 081221: GROND observations
  68. GRB 081222:Optical afterglow observation
  69. GRB 081222: Fermi GBM observation
  70. GRB081222: Swift/UVOT further observations
  71. GRB 081221: Probable host galaxy in Keck imaging
  72. GRB 081222, Swift-BAT refined analysis
  73. GRB 081221, Swift-BAT refined analysis
  74. GRB081222 optical limit by "Pi of the Sky"
  75. GRB 081222: Swift XRT refined analysis
  76. GRB081221: Fermi GBM observation
  77. Swift/UVOT observations of GRB 081221
  78. IPN triangulation of bright GRB 081215A
  79. GRB 081221: Swift-XRT Refined Analysis
  80. GRB 081221: pseudo-redshift (pz=0.7) from the spectral parameters of the prompt emission
  81. GRB081222, optical observation
  82. GRB081222: Swift/UVOT detection of an optical afterglow
  83. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  84. GRB 081222: Swift detection of a burst with a bright optical afterglow
  85. GRB 081221: Enhanced Swift-XRT position
  86. GRB 081221: Swift detection of a burst
  87. Modification of Swift/UVOT response to bright GRBs
  88. GRB 081211B: Further Swift-XRT analysis
  89. GRB 081211B - possibly a short burst with extended emission
  90. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  91. Possible GRB 081211B: Swift/UVOT Upper Limits
  92. GRB 081210: optical observations
  93. Possible GRB 081211B - Swift-XRT analysis
  94. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  95. GRB 081211: Swift-BAT refined analysis
  96. GRB 081211: Swift XRT refined analysis
  97. GRB 081211: Swift/UVOT detection of an optical afterglow
  98. GRB 081211: Enhanced Swift-XRT position
  99. GRB 081210: Swift/UVOT refined analysis
  100. GRB 081211: Swift detection of a burst

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