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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"

26765 results found.

  1. GRB 131110A found in ground analysis of BAT slew event data
  2. GRB 131108A: Continued RATIR Optical and NIR Observations
  3. GRB 131108A: Fermi GBM observation
  4. GRB 131108A: Swift/UVOT Detection
  5. GRB 131108A: RATIR Optical and NIR Observations
  6. GRB 131108A: Swift-XRT observations
  7. GRB 131108A: TAROT-Calern optical observation
  8. GRB 131108A: Fermi-LAT refined analysis
  9. GRB 131108A: NOT optical observations
  10. GRB 131108A: Swift detection of a possible X-ray afterglow
  11. GRB 131108A: Fermi-LAT onboard detection of a burst
  12. GRB 131030A: RATIR Optical and NIR Upper Limits
  13. GRB 131030A: Continued RATIR Optical and NIR Observations
  14. GRB 131105A, Swift-BAT refined analysis
  15. GRB 131105A: Swift-XRT refined Analysis
  16. GRB 131103A: Swift-BAT refined analysis
  17. GRB 131030A: Swift-BAT refined analysis
  18. GRB 131105A: Fermi GBM observation
  19. GRB 131105A: Swift/UVOT Upper Limits
  20. Konus-Wind observation of GRB 131105A
  21. GRB 131105A: VLT/X-shooter redshift
  22. GRB 131105A: TAROT La Silla observatory optical observations
  23. GRB 131105A: Swift detection of a burst
  24. GRB 131030A: Continued RATIR Optical and NIR Observations
  25. GRB 131103A: Swift/UVOT Detection
  26. GRB 131103A: Swift-XRT refined Analysis
  27. GRB 131103A: Swift detection of a burst
  28. GRB 131031A: RATIR Optical and NIR Observations and Upper Limits
  29. GRB131031A: RATIR Optical and NIR Observations
  30. GRB 131018B: RATIR Optical/NIR Observations
  31. GRB 131030A: Continued RATIR Optical and NIR Observations
  32. GRB 131031A: Fermi GBM detection
  33. GRB 131031A: Swift/UVOT Upper Limits
  34. LOAO B,R Observation of GRB131030A
  35. GRB 131018B: Further Swift-XRT observations.
  36. GRB 131030A - RoboPol optical afterglow polarimetry
  37. GRB 131031A: MASTER optical observation
  38. GRB 131030A: Bassano Bresciano Observatory optical observations
  39. GRB 131031A: Swift-XRT observations
  40. GRB 131030A: P60 observations
  41. GRB 131031A: 1.23m CAHA I-band and 1.5m OSN R-band observations of Swift/BAT error circle
  42. GRB 131031A found in ground analysis of BAT data
  43. GRB 131030A: RATIR Optical and NIR Observations
  44. GRB 131030A: TAROT La Silla observatory optical observations
  45. GRB 131030A: Swift-XRT refined Analysis
  46. GRB 131030A: Swift/UVOT Detection
  47. Konus-Wind observation of GRB 131030A
  48. GRB 131030A: SAO RAS optical observations
  49. GRB 131030A: D50+BART detection and light curve optical decay
  50. GRB 131029A: Nanshan optical observations
  51. GRB 131030A - Liverpool Telescope Optical Afterglow Confirmation
  52. GRB 131030A: Swift detection of a burst with an optical counterpart
  53. GRB 131029A: Fermi GBM observation
  54. GRB 131029A: Fermi-LAT detection of a burst
  55. IPN Triangulation of GRB 131028A (long/bright)
  56. GRB 131028A: Fermi GBM detection
  57. Swift 575905/GRB 131026A: optical observations
  58. Swift-BAT Trigger 575905 is probably not a real source
  59. GRB 131024B: Mondy optical upper limits
  60. Swift Trigger 575905/ GRB 131026A: MITSuME Okayama and Ishigakijima Optical upper limits
  61. Swift Trigger 575905/possible GRB 131026A: Swift-XRT observations
  62. Swift Trigger 575905: ROTSE-III Optical Limits
  63. Swift Trigger 575905: KAIT Optical Upper Limit
  64. GRB 131026A: TAROT La Silla observatory optical observations
  65. Swift Trigger 575905: a possible GRB
  66. GRB 131024B, Swift-BAT refined analysis
  67. GRB 131024B: Fermi GBM observation
  68. GRB 131024B: RATIR Optical and NIR Observations
  69. GRB 131024B: Swift/UVOT Upper Limits
  70. GRB 131024B: Swift-XRT refined Analysis
  71. Fermi GBM trigger 13121024.436 is not a GRB
  72. GRB 131024B: Nanshan optical upper limit
  73. GRB 131024A: Swift/UVOT Upper Limits
  74. GRB 131024A: Swift-XRT refined Analysis
  75. GRB 131024B: Swift detection of a burst
  76. GRB 131024A, Swift-BAT refined analysis
  77. GRB 131024A: Skynet R-COP optical observations
  78. Konus-Wind observation of GRB 131011B
  79. IPN triangulation of GRB 131011B (Swift Trigger 574266)
  80. GRB 131024A: Swift detection of a burst
  81. GRB 131014A: RATIR Optical/NIR Afterglow Retraction
  82. IPN Triangulation of GRB 131014A
  83. GRB 131018B: Swift/UVOT Upper Limits
  84. GRB 131018B: Swift-XRT observations
  85. GRB 131018B: Fermi GBM observation
  86. GRB 131018A: RATIR Optical and NIR Observations
  87. GRB 131018A: Swift/UVOT Upper Limits
  88. GRB 131018B: Fermi-LAT detection of a burst
  89. GRB 131018A: Swift-XRT refined Analysis
  90. GRB 131018A, Swift-BAT refined analysis
  91. GRB131018A, optical observations
  92. GRB 131018A: Swift detection of a burst
  93. GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
  94. Fermi GBM data availability during U.S. government shutdown
  95. GRB 131014A: Swift-XRT refined Analysis
  96. GRB 131011A: Swift/UVOT Upper Limits
  97. Fermi 403206457 / GRB 131011A: AAO optical observations
  98. GRB 131014A: RATIR Optical and NIR Observations
  99. GRB 131014A: NOT afterglow candidate
  100. GRB 131014A: Nanshan optical observations

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