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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"

42640 results found.

  1. GRB 101123A: MASTER prompt optical observations
  2. Konus-Wind observation of GRB 101123A
  3. IPN triangulation of bright GRB 101123A
  4. GRB 101123A: Fermi GBM detection
  5. Optical observation of GRB 101024A
  6. GRB 101117B: GROND Upper limits
  7. GRB 101117B: Swift/UVOT Observations of the Optical Afterglow
  8. GRB 101112A: OSN and BTA observations
  9. XRF 101117A: Palomar Transient Factory Observations
  10. GRB 101117B: Swift-XRT refined analysis
  11. GRB 101114A: Confirmation of the X-ray afterglow
  12. GRB 101117B: Swift-BAT refined analysis
  13. GRB 101117B: Enhanced Swift-XRT position
  14. GRB 101117B: Swift detection of a burst
  15. XRF101117A: MAXI/GSC detection of a short X-ray transient
  16. GRB 101114A: GROND Upper limits
  17. Konus-Wind observation of GRB 101114A
  18. Fermi GBM detection of a burst from a galactic source
  19. GRB 101114A: Swift-XRT candidate afterglow detection and analysis
  20. GRB 101114A, Swift-BAT GRB detected by ground processing
  21. Possible detection of INTEGRAL burst GRB 101112A by the EVLA
  22. GRB 101112A: Fermi GBM detection
  23. GRB 101112A: optical observations
  24. GRB 10112A: MASTER optical observations
  25. Konus-Wind observation of GRB 101112A
  26. GRB 101112A - XRT source detection/analysis
  27. GRB 101112A: BOOTES-2/TELMA optical afterglow candidate
  28. GRB101112A: Liverpool Telescope Afterglow Candidate
  29. GRB 101112A: a long GRB detected by INTEGRAL
  30. GRB 100906A: optical observations
  31. GRB 101030A : MOA optical observation
  32. GRB 101030A: GROND optical/NIR afterglow candidate
  33. GRB 101030A : Swift XRT refined analysis
  34. GRB 101030A: Swift/UVOT Upper Limits
  35. GRB 101030A: Swift-BAT refined analysis
  36. GRB 101030A: Enhanced Swift-XRT position
  37. GRB 101030A: Swift detection of a burst
  38. Konus-Wind observation of GRB 101023A
  39. GRB 101024A: GROND optical/NIR observations
  40. GRB 101024A: Zadko observatory - Gingin. Optical observations refined analysis
  41. GRB 101024A: Swift XRT refined analysis
  42. GRB 101024A: Zadko observatory - Gingin. Optical observations
  43. GRB 101024A: Fermi GBM observation
  44. GRB 101023A: Fermi GBM observation
  45. GRB 101024A: Swift-BAT refined analysis
  46. GRB 101024A: GRAS06 optical observations
  47. GRB 101024A: Enhanced Swift-XRT position
  48. Swift/UVOT observations of GRB101023A
  49. GRB 101024A: Swift detection of a burst with an optical afterglow
  50. GGRB 101023A: GROND detection of the optical-NIR afterglow
  51. GRB 101023A: Swift-XRT Team Refined Analysis
  52. GRB 101023A: Swift-BAT refined analysis
  53. GRB 101023A: Gemini discovery of optical afterglow
  54. GRB 101023A: Enhanced Swift-XRT position
  55. GRB 101023A: REM NIR observations
  56. GRB 101023A: Swift detection of a burst
  57. GRB 101020A: MASTER prompt and afterglow limit
  58. GRB 101020A: BOOTES2 follow-up and limit
  59. GRB 101020A: MASTER polarization optical observations
  60. GRB 101020A, Swift-BAT refined analysis
  61. GRB 101020A: Swift detection of a burst
  62. GRB 101017A: Swift XRT refined analysis
  63. GRB 101017A: Swift/UVOT Observations
  64. GRB 101008A: correction to the GCN 11352
  65. GRB 101008A: optical observations
  66. Konus-Wind observation of GRB 101017A
  67. GRB 101014A: Fermi LAT detection
  68. GRB 101017A: Enhanced Swift-XRT position
  69. GRB 101017A: Swift-BAT refined analysis
  70. GRB 101017A: Swift detection of a burst with optical counterpart
  71. GRB 101011A: Fermi GBM detection
  72. GRB 101011A: BOOTES-3 Upper Limit
  73. Konus-Wind observation of GRB 101014A
  74. GRB 101014A: Fermi GBM detection
  75. GRB 100906A: D50 optical detection
  76. GRB 100902A: D50 optical limit
  77. GRB 101011A: Swift/UVOT observations
  78. GRB 101011A, GROND upper limits
  79. GRB 101011A: Zadko observatory - Gingin optical observations
  80. GRB 101011A: XRT Refined Analysis
  81. GRB 101011A: Swift/UVOT Observations of a Possible Optical Afterglow
  82. GRB 101011A: Enhanced Swift-XRT position
  83. GRB 101011A: Swift-BAT refined analysis
  84. GRB 101011A: Swift detection of a burst
  85. GRB 101008A: Fermi GBM observation
  86. GRB 101008A: MASTER prompt optical observations
  87. GRB 101008A: Swift-BAT refined analysis
  88. GRB101008A, GROND detection of a fading afterglow
  89. GRB 101008A: Swift-XRT refined analysis
  90. GRB 101008A: SAO RAS optical observations
  91. GRB 100915 optical upper limit
  92. GRB 101008A: Enhanced Swift-XRT position
  93. GRB 101008A: 1.23m CAHA optical observations
  94. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  95. GRB 101008A: Swift detection of a burst
  96. GRB 100728B: X-shooter redshift
  97. Refined analysis shows Swift Trigger 435520 is not a GRB
  98. Swift Trigger 435520 is probably not a GRB
  99. GRB 100925A / MAXI J1659-152: MASTER optical observations
  100. GRB 100924A: Suzaku WAM observation of the prompt emission

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