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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"

26664 results found.

  1. GRB 111103B : WIYN 3.5m NIR observations
  2. GRB 111103B: Swift-XRT refined Analysis
  3. GRB 111103A: Fermi GBM observation
  4. GRB111103B Swift/UVOT Upper Limits
  5. GRB 111103B: Enhanced Swift-XRT position
  6. Trigger 506913: Swift detection of Swift J1922.7-1716 and its optical counterpart
  7. GRB 111103B: Swift detection of a strong burst from a GRB or Galactic source
  8. GRB 111029A: RAPTOR Limits During the Gamma-ray Emitting Interval
  9. GRB 111029A: SAO RAS optical limits
  10. GRB 111029A: Super-LOTIS early limits
  11. All GCN Circulars available in a tarfile for data mining
  12. GRB111029A: MITSuME Ishigakijima Optical Upper Limits
  13. GRB 111029A: Swift-XRT refined Analysis
  14. GRB 111029A: PAIRITEL NIR Upper Limits
  15. GRB 111029A: Swift/UVOT Upper Limits
  16. GRB 111029A: KAIT optical limits
  17. GRB 111029A: Swift-BAT refined analysis
  18. GRB 111029A: Enhanced Swift-XRT position
  19. GRB 111029A: Faulkes Telescope North observations
  20. GRB 111029A: optical upper limit
  21. GRB 111029A: ROTSE-III Optical Limits
  22. GRB 111029A: Swift detection of a burst
  23. GRB 111022B: 10.4m GTC z'-band observations
  24. GRB111022B: D50 optical limit
  25. GRB 111020A: Chandra Observation
  26. GRB 111022B: BTA Optical Observations
  27. GRB 111022B: Swift/UVOT upper limits
  28. GRB 111022A: Swift/UVOT Upper Limits
  29. GRB 111016A: optical upper limit
  30. GRB 111022B: Swift-XRT refined Analysis
  31. GRB 111022A: Swift-XRT refined Analysis
  32. GRB 111022B: NOT observations
  33. GRB 111022B: Enhanced Swift-XRT position
  34. GRB 111022A: Swift-BAT refined analysis
  35. GRB 111022A: Preliminary UVOT TDRSS Non-Detection
  36. GRB 111022B: Swift detection of a burst
  37. GRB 111022A: Swift detection of a burst
  38. GRB 111020A: Gemini-South additional observations and limit on an optical afterglow
  39. GRB 111020A: Swift-XRT refined Analysis
  40. GRB 111020A: Swift/UVOT Upper Limits
  41. GRB 111020A: Faulkes Telescope South observations
  42. GRB 111020A: Enhanced Swift-XRT position
  43. GRB 111020A: BOOTES-3 Optical Upper Limit.
  44. GRB 111020A: Swift detection of a short burst
  45. GRB 111018A: Swift/UVOT Upper Limits
  46. GRB 111018A: Swift-XRT refined Analysis
  47. GRB 111018A: GROND Upper Limits
  48. GRB 111018A: Enhanced Swift-XRT position
  49. IPN Triangulation of GRB 111016B (long duration, intense)
  50. GRB111016A : WIYN 3.5m NIR observations
  51. GRB 111018A: Swift detection of a burst
  52. GRB 111017A: Fermi GBM Detection
  53. GRB111016A: D50 optical limit
  54. GRB 111016A: Gemini Detection of the NIR Counterpart
  55. GRB 111016A: Swift/UVOT Detection of a Source
  56. GRB 111016A: P60 Afterglow Candidate
  57. GRB 111016A: Swift-XRT refined Analysis
  58. GRB 111016A: Enhanced Swift-XRT position
  59. GRB 111016A: Swift-XRT observations
  60. GRB 111016A: Swift detection of a burst
  61. GRB 110921A: optical observations
  62. GRB 111008A: Swift/UVOT Upper Limits
  63. Konus-Wind observation of GRB 111008A
  64. GRB 111008A: IAC80 I-band observations
  65. GRB 111008A: VLT/X-shooter spectroscopy
  66. GRB 111008A: Swift-XRT refined Analysis
  67. GRB 111008A, GROND observations
  68. GRB 111008A: NOT optical observation
  69. GRB 111008A: Gemini optical counterpart
  70. GRB 111008A: Enhanced Swift-XRT position
  71. GRB 111008A: Swift detection of a burst
  72. GRB 111005A: ATCA 18 GHz detection
  73. GRB 111005A: ATCA radio upper limit
  74. GRB 111005A : miniTAO/ANIR NIR observations
  75. GRB 111005A: GROND NIR observations
  76. GRB 111005A: VLT IR observations
  77. GRB 111003A: Fermi GBM detection
  78. GRB 110921A: MITSuME-Akeno Optical photometry
  79. Skynet/Dolomiti observations of GRB 110928A
  80. Skynet observations of GRB 110928A
  81. GRB 110928A: RAPTOR Limits During Gamma-ray Emitting Interval
  82. GRB 110928A: Swift/UVOT Upper Limits
  83. GRB 110928A: Swift-XRT refined Analysis
  84. GRB 110825A: GROND Observations
  85. GRB 110928A: Enhanced Swift-XRT position
  86. GRB 110928A: P60 Observations
  87. GRB 110928A: Further PAIRITEL NIR Observations
  88. GRB 110928A: Swift-XRT observations
  89. GRB 110928A: Swift/UVOT finding chart observation
  90. GRB 110928A: PAIRITEL NIR Observations
  91. GRB 110928A: ROTSE-III Optical Limits
  92. GRB 110924A: Swift detection of a possible burst
  93. GCN for GRB 110921B
  94. GRB 110921A: Swift/UVOT Observations
  95. GRB 110921A: NOT observations
  96. GRB 110921A: Fermi GBM observation
  97. GRB 110921A: TNT astrometry
  98. GRB 110921A: Swift-XRT refined Analysis
  99. GRB 110918A: Liverpool Telescope optical observations
  100. GRB 110921A: optical observations in Mt. Terskol and Maidanak observatories

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