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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"

27815 results found.

  1. Skynet observations of GRB 111107A
  2. GRB 111107A: Swift detection of a burst with an optical counterpart
  3. Konus-Wind observation of GRB 111103B
  4. GRB 111103B: Swift-XRT refined Analysis
  5. GRB 111103A: Fermi GBM observation
  6. GRB111103B Swift/UVOT Upper Limits
  7. Trigger 506913: MASTER detection of Swift J1922.7-1716 optical counterpart
  8. GRB 111103B: Enhanced Swift-XRT position
  9. GRB 111103B: Swift-BAT refined analysis
  10. GRB 111103A: Swift-BAT refined analysis
  11. Trigger 506913: Swift detection of Swift J1922.7-1716 and its optical counterpart
  12. GRB 111022B: MASTER OT observations
  13. GRB 111103B: optical observations
  14. GRB 111103B: Swift detection of a strong burst from a GRB or Galactic source
  15. GRB 111103A: Swift detection of a burst
  16. Swift-BAT trigger 506884 is not a GRB
  17. GRB 111029A: RAPTOR Limits During the Gamma-ray Emitting Interval
  18. GRB 111029A: Swift-XRT refined Analysis
  19. GRB 111029A: PAIRITEL NIR Upper Limits
  20. GRB 111026A: Swift-BAT refined analysis
  21. GRB 111029A: Swift/UVOT Upper Limits
  22. GRB 111029A: KAIT optical limits
  23. GRB 111029A: Swift-BAT refined analysis
  24. GRB 111029A: Enhanced Swift-XRT position
  25. GRB 111029A: Faulkes Telescope North observations
  26. GRB 111029A: optical upper limit
  27. GRB 111029A: ROTSE-III Optical Limits
  28. GRB 111029A: Swift detection of a burst
  29. GRB 111026A: Swift detection of a burst
  30. GRB 111022B: EVLA observations - correction to GCN 12495
  31. GRB 111022B: EVLA observations
  32. GRB111022B: D50 optical limit
  33. GRB 111022A: MITSuME Akeno Optical upper limits
  34. GRB 111024A: MAXI/GSC detection of a burst
  35. GRB 111022B: Swift/UVOT upper limits
  36. GRB 111022A: Swift/UVOT Upper Limits
  37. GRB 111016A: optical upper limit
  38. GRB 111022B, Swift-BAT refined analysis
  39. GRB 111022B: Swift-XRT refined Analysis
  40. GRB 111022A: Swift-XRT refined Analysis
  41. GRB 111022B: NOT observations
  42. GRB 111022B: Enhanced Swift-XRT position
  43. GRB 111022A: Swift-BAT refined analysis
  44. GRB 111022B: MASTER-Net early limit
  45. GRB 111022A: Preliminary UVOT TDRSS Non-Detection
  46. GRB 111022A: MASTER-Net early limit
  47. GRB 111022B: Swift detection of a burst
  48. GRB 111022A: Swift detection of a burst
  49. GRB 111020A: Swift-XRT refined Analysis
  50. GRB 111020A: Swift/UVOT Upper Limits
  51. GRB 111020A: Swift-BAT refined analysis
  52. GRB 111020A: Enhanced Swift-XRT position
  53. GRB 111020A: BOOTES-3 Optical Upper Limit.
  54. GRB 111020A: Swift detection of a short burst
  55. GRB 111018A: Swift/UVOT Upper Limits
  56. GRB 111018A: Swift-BAT refined analysis
  57. GRB 111018A: Swift-XRT refined Analysis
  58. GRB 111018A: GROND Upper Limits
  59. GRB 111018A: Enhanced Swift-XRT position
  60. IPN Triangulation of GRB 111016B (long duration, intense)
  61. GRB 111018A: Swift detection of a burst
  62. GRB 111017A: Fermi GBM Detection
  63. GRB111016A: D50 optical limit
  64. GRB 111016A: Gemini Detection of the NIR Counterpart
  65. GRB 111016A: Swift/UVOT Detection of a Source
  66. GRB 111016A: Swift-BAT refined analysis
  67. GRB 111016A: P60 Afterglow Candidate
  68. GRB 111016A: Swift-XRT refined Analysis
  69. GRB 111016A: Enhanced Swift-XRT position
  70. GRB 111016A: Swift-XRT observations
  71. GRB 111016A: Swift detection of a burst
  72. GRB 110921A: optical observations
  73. EVLA 22 GHz Detection of GRB 111008A
  74. GRB 111005A: ATCA 18 GHz decay
  75. GRB 111008A: Swift/UVOT Upper Limits
  76. Konus-Wind observation of GRB 111008A
  77. GRB 111008A: Swift-XRT refined Analysis
  78. GRB 111008A, GROND observations
  79. GRB 111008A: Enhanced Swift-XRT position
  80. GRB 111008A, Swift-BAT refined analysis,
  81. GRB 111008A: Swift detection of a burst
  82. GRB 111005A: ATCA 18 GHz detection
  83. GRB 111005A: ATCA radio upper limit
  84. GRB 111005A: Swift-BAT refined analysis
  85. GRB 111005A: Swift detection of a burst
  86. GRB 111003A: Fermi GBM detection
  87. GRB 110905A / MAXI J1836-194: optical monitoring
  88. GRB 110928A: RAPTOR Limits During Gamma-ray Emitting Interval
  89. GRB 110928A: Swift/UVOT Upper Limits
  90. Trigger 504307: Swift detection of MAXI J1836-194
  91. GRB 110928A: Swift-XRT refined Analysis
  92. GRB 110825A: GROND Observations
  93. GRB 110928A: Enhanced Swift-XRT position
  94. GRB 110928A: P60 Observations
  95. GRB 110928A: Further PAIRITEL NIR Observations
  96. GRB 110928A: Swift-BAT refined analysis
  97. GRB 110928A: Swift-XRT observations
  98. GRB 110928A: Swift/UVOT finding chart observation
  99. GRB 110928A: ROTSE-III Optical Limits
  100. GRB 110928A: Swift detection of a burst

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