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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

42572 results found.

  1. GRB 101219A: Further Gemini-South Imaging
  2. GRB 101219A: Swift-BAT refined analysis
  3. GRB 101219A - NOT observation - upper limit
  4. GRB 101219A: SARA-N Upper Limit
  5. GRB 101219A: Gemini-South observations
  6. GRB 101219A: Swift detection of a short hard burst
  7. Request for Supernova related data for GRB 101023A
  8. GRB 101213A : Suzaku WAM observation of the prompt emission
  9. Redshift solution(s) for GRB101213A from Swift-XRT data
  10. Konus-Wind observation of GRB 101213A
  11. XRF 101117A, RIMOTS optical upper limits
  12. GRB 101213A: Fermi GBM observation
  13. GRB 101213A, Swift-BAT refined analysis
  14. GRB 101213A: Swift-XRT refined Analysis
  15. GRB 101213A: Enhanced Swift-XRT position
  16. GRB 101213: object within the X-ray error circle
  17. GRB 101213A: Swift detection of a burst
  18. GRB 101204A: Swift-XRT refined Analysis
  19. GRB101204A GROND Detection of the Optical/NIR Afterglow
  20. GRB 101129A : Suzaku WAM observation of the prompt emission
  21. GRB 101204A Swift-XRT/UVOT afterglow candidate
  22. Konus-Wind observation of GRB 101130A
  23. GRB 101204A detected in ground analysis of BAT data
  24. Konus-Wind observation of GRB 101129A
  25. IPN Localization of GRB101130 (possible short duration burst)
  26. GRB 101129A SHB found by IPN and in ground analysis of BAT data
  27. GRB 101201A: Fermi GBM observation
  28. GRB 101201A: Swift-XRT refined Analysis
  29. GRB 101201A: Swift/UVOT Detection
  30. GRB 101201A: GROND Detection of the Optical/NIR Afterglow
  31. GRB 101201A detected in ground analysis of BAT data
  32. Swift detection of MAXIJ1409-619
  33. GRB 101123A: MASTER prompt optical observations
  34. Konus-Wind observation of GRB 101123A
  35. IPN triangulation of bright GRB 101123A
  36. GRB 101123A: Fermi GBM detection
  37. Optical observation of GRB 101024A
  38. GRB 101117B: GROND Upper limits
  39. GRB 101117B: Swift/UVOT Observations of the Optical Afterglow
  40. GRB 101112A: OSN and BTA observations
  41. XRF 101117A: Palomar Transient Factory Observations
  42. GRB 101117B: Swift-XRT refined analysis
  43. GRB 101114A: Confirmation of the X-ray afterglow
  44. GRB 101117B: Swift-BAT refined analysis
  45. GRB 101117B: Enhanced Swift-XRT position
  46. GRB 101117B: Swift detection of a burst
  47. XRF101117A: MAXI/GSC detection of a short X-ray transient
  48. GRB 101114A: GROND Upper limits
  49. Konus-Wind observation of GRB 101114A
  50. Fermi GBM detection of a burst from a galactic source
  51. GRB 101114A: Swift-XRT candidate afterglow detection and analysis
  52. GRB 101114A, Swift-BAT GRB detected by ground processing
  53. Possible detection of INTEGRAL burst GRB 101112A by the EVLA
  54. GRB 101112A: Fermi GBM detection
  55. GRB 101112A: optical observations
  56. GRB 10112A: MASTER optical observations
  57. Konus-Wind observation of GRB 101112A
  58. GRB 101112A - XRT source detection/analysis
  59. GRB 101112A: BOOTES-2/TELMA optical afterglow candidate
  60. GRB101112A: Liverpool Telescope Afterglow Candidate
  61. GRB 101112A: a long GRB detected by INTEGRAL
  62. GRB 100906A: optical observations
  63. GRB 101030A : MOA optical observation
  64. GRB 101030A: GROND optical/NIR afterglow candidate
  65. GRB 101030A : Swift XRT refined analysis
  66. GRB 101030A: Swift/UVOT Upper Limits
  67. GRB 101030A: Swift-BAT refined analysis
  68. GRB 101030A: Enhanced Swift-XRT position
  69. GRB 101030A: Swift detection of a burst
  70. Konus-Wind observation of GRB 101023A
  71. GRB 101024A: GROND optical/NIR observations
  72. GRB 101024A: Zadko observatory - Gingin. Optical observations refined analysis
  73. GRB 101024A: Swift XRT refined analysis
  74. GRB 101024A: Zadko observatory - Gingin. Optical observations
  75. GRB 101024A: Fermi GBM observation
  76. GRB 101023A: Fermi GBM observation
  77. GRB 101024A: Swift-BAT refined analysis
  78. GRB 101024A: GRAS06 optical observations
  79. GRB 101024A: Enhanced Swift-XRT position
  80. Swift/UVOT observations of GRB101023A
  81. GRB 101024A: Swift detection of a burst with an optical afterglow
  82. GGRB 101023A: GROND detection of the optical-NIR afterglow
  83. GRB 101023A: Swift-XRT Team Refined Analysis
  84. GRB 101023A: Swift-BAT refined analysis
  85. GRB 101023A: Gemini discovery of optical afterglow
  86. GRB 101023A: Enhanced Swift-XRT position
  87. GRB 101023A: REM NIR observations
  88. GRB 101023A: Swift detection of a burst
  89. GRB 101020A: MASTER prompt and afterglow limit
  90. GRB 101020A: BOOTES2 follow-up and limit
  91. GRB 101020A: MASTER polarization optical observations
  92. GRB 101020A, Swift-BAT refined analysis
  93. GRB 101020A: Swift detection of a burst
  94. GRB 101017A: Swift XRT refined analysis
  95. GRB 101017A: Swift/UVOT Observations
  96. GRB 101008A: correction to the GCN 11352
  97. GRB 101008A: optical observations
  98. Konus-Wind observation of GRB 101017A
  99. GRB 101014A: Fermi LAT detection
  100. GRB 101017A: Enhanced Swift-XRT position

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