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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"

28100 results found.

  1. GRB 101225A: Enhanced Swift-XRT position
  2. Trigger 441015 / GRB 101225A: Further NOT optical observation
  3. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  4. GRB 101225A (Swift trigger 441015): optical upper limit
  5. Trigger 441015: Swift detection of a possible burst or transient
  6. GRB 101224A: NOT optical observation
  7. GRB 101224A: Pre-event imaging from DeepSky; Detection of a source in the XRT error circle
  8. GRB 101224A: Swift/UVOT Upper Limits
  9. GRB 101224A: Swift-XRT refined Analysis
  10. GRB101224A: MITSuME Okayama optical upper limits
  11. GRB 101224A, Swift-BAT refined analysis
  12. GRB 101224A - UVOT-enhanced XRT position
  13. GRB 101224A: Swift detection of a short burst
  14. GRB 101219A: Chandra Observations
  15. GRB 101219B: Swift/UVOT refined analysis
  16. GRB 101219B: Swift-XRT refined Analysis
  17. GRB 101219B: Enhanced Swift-XRT position
  18. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  19. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  20. GRB 101219B: Fermi GBM observation
  21. GRB 101219A: IAC80 optical observations
  22. GRB 101219B: Swift-BAT refined analysis
  23. GRB 101219A: Swift-XRT refined Analysis
  24. GRB 101219B: Swift detection of a burst with an optical afterglow
  25. GRB 101219A: Swift/UVOT Upper Limits
  26. GRB 101219A: GROND Upper limits
  27. GRB 101219A: Magellan NIR observations
  28. GRB 101219A: Further Gemini-South Imaging
  29. GRB 101219A: Swift-BAT refined analysis
  30. GRB 101219A - NOT observation - upper limit
  31. GRB 101219A: SARA-N Upper Limit
  32. GRB 101219A: REM optical and NIR observations
  33. GRB 101219A: Swift detection of a short hard burst
  34. GRB 101213A : Suzaku WAM observation of the prompt emission
  35. Redshift solution(s) for GRB101213A from Swift-XRT data
  36. XRF 101117A, RIMOTS optical upper limits
  37. GRB 101213A: Fermi GBM observation
  38. GRB 101213A, Swift-BAT refined analysis
  39. GRB 101213A: Swift-XRT refined Analysis
  40. GRB 101213A: Swift/UVOT Upper Limits
  41. GRB 101213A: Enhanced Swift-XRT position
  42. GRB 101213: object within the X-ray error circle
  43. GRB 101213A: Swift detection of a burst
  44. GRB101204A: Swift/UVOT observations
  45. GRB 101204A: Swift-XRT refined Analysis
  46. GRB101204A GROND Detection of the Optical/NIR Afterglow
  47. GRB 101204A Afterglow Candidate, VATT Observations
  48. GRB 101129A : Suzaku WAM observation of the prompt emission
  49. GRB 101204A Swift-XRT/UVOT afterglow candidate
  50. Konus-Wind observation of GRB 101130A
  51. GRB101030A
  52. GRB 101201A: Fermi GBM observation
  53. GRB 101201A: Swift-XRT refined Analysis
  54. GRB 101201A: Swift/UVOT Detection
  55. GRB 101201A: GROND Detection of the Optical/NIR Afterglow
  56. GRB 101123A: ROTSE optical observations
  57. GRB 101123A: MASTER prompt optical observations
  58. GRB 101123A: Fermi GBM detection
  59. GRB 101117B: GROND Upper limits
  60. GRB 101117B: Swift/UVOT Observations of the Optical Afterglow
  61. GRB 101112A: OSN and BTA observations
  62. XRF 101117A: Palomar Transient Factory Observations
  63. GRB 101117B: Swift-XRT refined analysis
  64. GRB101114A: Swift/UVOT Upper Limits
  65. GRB 101117B: Swift-BAT refined analysis
  66. GRB 101117B: Enhanced Swift-XRT position
  67. GRB 101117B: Swift detection of a burst
  68. GRB 101114A: GROND Upper limits
  69. Konus-Wind observation of GRB 101114A
  70. Fermi GBM detection of a burst from a galactic source
  71. GRB 101114A: Swift-XRT candidate afterglow detection and analysis
  72. GRB 101114A, Swift-BAT GRB detected by ground processing
  73. GRB 101112A: Fermi GBM detection
  74. GRB 101112A: optical observations
  75. Konus-Wind observation of GRB 101112A
  76. GRB 101112A - XRT source detection/analysis
  77. GRB101112A: Liverpool Telescope Afterglow Candidate
  78. GRB 101112A: a long GRB detected by INTEGRAL
  79. GRB 090113, the review of the sky area in plate archives
  80. GRB 101030A : MOA optical observation
  81. GRB 101030A: GROND optical/NIR afterglow candidate
  82. GRB 101030A : Swift XRT refined analysis
  83. GRB 101030A: Swift/UVOT Upper Limits
  84. GRB 101030A: Swift-BAT refined analysis
  85. GRB 101030A: Enhanced Swift-XRT position
  86. GRB 101030A: Swift detection of a burst
  87. GRB 090111, the review of the sky area in plate archives (1976-1996)
  88. GRB 101024A: GROND optical/NIR observations
  89. GRB 101024A: Swift XRT refined analysis
  90. GRB 101024A: Zadko observatory - Gingin. Optical observations
  91. GRB 101024A: Fermi GBM observation
  92. GRB101024A: Swift/UVOT
  93. GRB 101024A: Swift-BAT refined analysis
  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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