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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"

42200 results found.

  1. GRB 101219A: Swift-XRT refined Analysis
  2. GRB 101219B: Swift detection of a burst with an optical afterglow
  3. GRB 101219A: Swift/UVOT Upper Limits
  4. GRB 101219A: GROND Upper limits
  5. Konus-Wind observation of short hard GRB 101219A
  6. GRB 101219A: Magellan NIR observations
  7. GRB 101219A: Further Gemini-South Imaging
  8. GRB 101219A: Swift-BAT refined analysis
  9. GRB 101219A - NOT observation - upper limit
  10. GRB 101219A: SARA-N Upper Limit
  11. GRB 101219A: Gemini-South observations
  12. GRB 101219A: REM optical and NIR observations
  13. GRB 101219A: ROTSE-III Optical Limits
  14. GRB 101219A: Swift detection of a short hard burst
  15. GRB 101213A : Suzaku WAM observation of the prompt emission
  16. Redshift solution(s) for GRB101213A from Swift-XRT data
  17. Konus-Wind observation of GRB 101213A
  18. XRF 101117A, RIMOTS optical upper limits
  19. GRB 101213A: Fermi GBM observation
  20. GRB 101213A, Swift-BAT refined analysis
  21. GRB 101213A: Swift-XRT refined Analysis
  22. GRB 101213A: Swift/UVOT Upper Limits
  23. GRB 101213A: Enhanced Swift-XRT position
  24. GRB 101213: object within the X-ray error circle
  25. GRB 101213A: Swift detection of a burst
  26. GRB101204A: Swift/UVOT observations
  27. GRB 101204A: Swift-XRT refined Analysis
  28. GRB101204A GROND Detection of the Optical/NIR Afterglow
  29. GRB 101204A Afterglow Candidate, VATT Observations
  30. GRB 101129A : Suzaku WAM observation of the prompt emission
  31. GRB 101204A Swift-XRT/UVOT afterglow candidate
  32. Konus-Wind observation of GRB 101130A
  33. GRB 101204A detected in ground analysis of BAT data
  34. Konus-Wind observation of GRB 101129A
  35. IPN Localization of GRB101130 (possible short duration burst)
  36. GRB 101129A SHB found by IPN and in ground analysis of BAT data
  37. GRB101030A
  38. GRB 101201A: Fermi GBM observation
  39. GRB 101201A: Swift-XRT refined Analysis
  40. GRB 101201A: GROND Detection of the Optical/NIR Afterglow
  41. GRB 101201A detected in ground analysis of BAT data
  42. Swift detection of MAXIJ1409-619
  43. GRB 101123A: ROTSE optical observations
  44. GRB 101123A: MASTER prompt optical observations
  45. Konus-Wind observation of GRB 101123A
  46. IPN triangulation of bright GRB 101123A
  47. GRB 101123A: Fermi GBM detection
  48. Optical observation of GRB 101024A
  49. GRB 101117B: GROND Upper limits
  50. GRB 101117B: Swift/UVOT Observations of the Optical Afterglow
  51. GRB 101112A: OSN and BTA observations
  52. XRF 101117A: Palomar Transient Factory Observations
  53. GRB 101117B: Swift-XRT refined analysis
  54. GRB 101114A: Confirmation of the X-ray afterglow
  55. GRB 101117B: Swift-BAT refined analysis
  56. GRB 101117B: Enhanced Swift-XRT position
  57. GRB 101117B: Swift/UVOT Discovery of an Optical Afterglow
  58. GRB 101117B: Swift detection of a burst
  59. XRF101117A: MAXI/GSC detection of a short X-ray transient
  60. GRB 101114A: GROND Upper limits
  61. Konus-Wind observation of GRB 101114A
  62. Fermi GBM detection of a burst from a galactic source
  63. GRB 101114A: Swift-XRT candidate afterglow detection and analysis
  64. GRB 101114A, Swift-BAT GRB detected by ground processing
  65. Possible detection of INTEGRAL burst GRB 101112A by the EVLA
  66. GRB 101112A: Fermi GBM detection
  67. GRB 101112A: optical observations
  68. GRB 10112A: MASTER optical observations
  69. Konus-Wind observation of GRB 101112A
  70. GRB 101112A - XRT source detection/analysis
  71. GRB 101112A: BOOTES-2/TELMA optical afterglow candidate
  72. GRB101112A: Liverpool Telescope Afterglow Candidate
  73. GRB 101112A: a long GRB detected by INTEGRAL
  74. GRB 100906A: optical observations
  75. GRB 090113, the review of the sky area in plate archives
  76. GRB 101030A : MOA optical observation
  77. GRB 101030A: GROND optical/NIR afterglow candidate
  78. GRB 101030A : Swift XRT refined analysis
  79. GRB 101030A: Swift-BAT refined analysis
  80. GRB 101030A: Enhanced Swift-XRT position
  81. GRB 101030A: Swift detection of a burst
  82. GRB 090111, the review of the sky area in plate archives (1976-1996)
  83. Konus-Wind observation of GRB 101023A
  84. GRB 101024A: GROND optical/NIR observations
  85. GRB 101024A: Zadko observatory - Gingin. Optical observations refined analysis
  86. GRB 101024A: Swift XRT refined analysis
  87. GRB 101024A: Zadko observatory - Gingin. Optical observations
  88. GRB 101023A: miniTAO/ANIR NIR detection
  89. GRB 101024A: Fermi GBM observation
  90. GRB 101023A: Fermi GBM observation
  91. GRB101024A: Swift/UVOT
  92. GRB 101024A: Swift-BAT refined analysis
  93. GRB 101024A: GRAS06 optical observations
  94. GRB 101024A: Enhanced Swift-XRT position
  95. Swift/UVOT observations of GRB101023A
  96. GRB 101024A: Swift detection of a burst with an optical afterglow
  97. GGRB 101023A: GROND detection of the optical-NIR afterglow
  98. GRB 101023A: Swift-XRT Team Refined Analysis
  99. GRB 101023A: Swift-BAT refined analysis
  100. GRB 101023A: Gemini discovery of optical afterglow

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