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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"

28301 results found.

  1. GRB 111026A: Swift-BAT refined analysis
  2. GRB 111029A: Swift/UVOT Upper Limits
  3. GRB 111029A: Swift-BAT refined analysis
  4. GRB 111029A: Enhanced Swift-XRT position
  5. GRB 111029A: optical upper limit
  6. GRB 111029A: ROTSE-III Optical Limits
  7. GRB 111029A: Swift detection of a burst
  8. GRB 111026A: Swift detection of a burst
  9. GRB 111022B: 10.4m GTC z'-band observations
  10. GRB111022B: D50 optical limit
  11. GRB 111020A: Chandra Observation
  12. GRB 111022B: BTA Optical Observations
  13. GRB 111022B: Swift/UVOT upper limits
  14. GRB 111022A: Swift/UVOT Upper Limits
  15. GRB 111016A: optical upper limit
  16. GRB 111022B, Swift-BAT refined analysis
  17. GRB 111022B: Swift-XRT refined Analysis
  18. GRB 111022A: Swift-XRT refined Analysis
  19. GRB 111022B: NOT observations
  20. GRB 111022B: Enhanced Swift-XRT position
  21. GRB 111022A: Swift-BAT refined analysis
  22. GRB 111022A: Preliminary UVOT TDRSS Non-Detection
  23. GRB 111022B: Swift detection of a burst
  24. GRB 111022A: Swift detection of a burst
  25. GRB 111020A: Gemini-South additional observations and limit on an optical afterglow
  26. GRB 111020A: EVLA observations
  27. GRB 111020A: Swift-XRT refined Analysis
  28. GRB 111020A: Swift/UVOT Upper Limits
  29. GRB 111020A: Faulkes Telescope South observations
  30. GRB 111020A: Swift-BAT refined analysis
  31. GRB 111020A: Enhanced Swift-XRT position
  32. GRB 111020A: BOOTES-3 Optical Upper Limit.
  33. GRB 111020A: Swift detection of a short burst
  34. GRB 111018A: Swift/UVOT Upper Limits
  35. GRB 111018A: Swift-BAT refined analysis
  36. GRB 111018A: Swift-XRT refined Analysis
  37. GRB 111018A: GROND Upper Limits
  38. GRB 111018A: Enhanced Swift-XRT position
  39. IPN Triangulation of GRB 111016B (long duration, intense)
  40. GRB111016A : WIYN 3.5m NIR observations
  41. GRB 111018A: Swift detection of a burst
  42. GRB 111017A: Fermi GBM Detection
  43. GRB111016A: D50 optical limit
  44. GRB 111016A: Gemini Detection of the NIR Counterpart
  45. GRB 111016A: Swift/UVOT Detection of a Source
  46. GRB 111016A: Swift-BAT refined analysis
  47. GRB 111016A: P60 Afterglow Candidate
  48. GRB 111016A: Swift-XRT refined Analysis
  49. GRB 111016A: Enhanced Swift-XRT position
  50. GRB 111016A: Swift-XRT observations
  51. GRB 111016A: Swift detection of a burst
  52. GRB 110921A: optical observations
  53. GRB 111008A: Swift/UVOT Upper Limits
  54. GRB 111008A: IAC80 I-band observations
  55. GRB 111008A: Swift-XRT refined Analysis
  56. GRB 111008A, GROND observations
  57. GRB 111008A: NOT optical observation
  58. GRB 111008A: Gemini optical counterpart
  59. GRB 111008A: Enhanced Swift-XRT position
  60. GRB 111008A, Swift-BAT refined analysis,
  61. GRB 111008A: Swift detection of a burst
  62. GRB 111005A: ATCA 18 GHz detection
  63. GRB 111005A: ATCA radio upper limit
  64. GRB 111005A : miniTAO/ANIR NIR observations
  65. GRB 111005A: GROND NIR observations
  66. GRB 111005A: VLT IR observations
  67. GRB 111005A: Swift-BAT refined analysis
  68. GRB 111005A: Swift detection of a burst
  69. GRB 111003A: Fermi GBM detection
  70. GRB 110921A: MITSuME-Akeno Optical photometry
  71. Skynet/Dolomiti observations of GRB 110928A
  72. Skynet observations of GRB 110928A
  73. GRB 110928A: RAPTOR Limits During Gamma-ray Emitting Interval
  74. GRB 110928A: Swift/UVOT Upper Limits
  75. GRB 110928A: Swift-XRT refined Analysis
  76. GRB 110825A: GROND Observations
  77. GRB 110928A: Enhanced Swift-XRT position
  78. GRB 110928A: P60 Observations
  79. GRB 110928A: Further PAIRITEL NIR Observations
  80. GRB 110928A: Swift-BAT refined analysis
  81. GRB 110928A: Swift-XRT observations
  82. GRB 110928A: Swift/UVOT finding chart observation
  83. GRB 110928A: PAIRITEL NIR Observations
  84. GRB 110928A: ROTSE-III Optical Limits
  85. GRB 110924A: Swift detection of a possible burst
  86. GCN for GRB 110921B
  87. GRB 110921A: Swift/UVOT Observations
  88. GRB 110921A: NOT observations
  89. GRB 110921A: Fermi GBM observation
  90. GRB 110921A: TNT astrometry
  91. GRB 110921A: Swift-XRT refined Analysis
  92. GRB 110921A, Swift-BAT refined analysis
  93. GRB 110921A: optical observations in Mt. Terskol and Maidanak observatories
  94. GRB 110921A: Enhanced Swift-XRT position
  95. GRB 110918A: Swift-XRT refined Analysis
  96. GRB 110921A: Swift detection of a burst
  97. GRB 110915B : X-ray afterglow confirmation
  98. GRB 110918A: Swift/UVOT Detection of the Optical Counterpart
  99. GRB 110918A optical observation
  100. GRB 110918A: GROND detection of the afterglow candidate

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