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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"

19598 results found.

  1. GRB 131127A: Enhanced Swift-XRT position
  2. GRB 131127A: Mondy optical upper limit
  3. GRB 131127A: MASTER-NET optical observations
  4. GRB 131127A: Swift detection of a burst
  5. GRB 131122A: Swift/UVOT Upper Limits
  6. GRB 131122A: Upper limit from NOT imaging
  7. GRB 131122A: Swift-XRT observations
  8. GRB 131120A, Swift-BAT refined analysis
  9. IPN Triangulation of GRB 131118A
  10. GRB 131120A: Swift detection of a burst
  11. GRB 131118A: Fermi GBM detection
  12. GRB 131030A, Optical Observations
  13. GRB 131117A, Swift-BAT refined analysis
  14. GRB 131117A: TAROT La Silla observatory optical observations
  15. GRB 131117A: Swift/UVOT Detection
  16. GRB 131117A: Swift-XRT refined Analysis
  17. GRB 131117A: GROND confirmation of the afterglow and photo-z.
  18. GRB 131117A: Enhanced Swift-XRT position
  19. GRB 131117A: Skynet PROMPT optical detection of an afterglow
  20. GRB 131117A: Swift detection of a burst
  21. GRB 131110A: Swift-XRT and UVOT upper limits
  22. GRB 131110A BAT refined analysis
  23. GRB 131031A: Mondy optical observations
  24. GRB 131108A: optical observations
  25. GRB 131110A found in ground analysis of BAT slew event data
  26. GRB 131108A: Fermi GBM observation
  27. GRB 131108A: Swift/UVOT Detection
  28. GRB 131108A: Swift-XRT observations
  29. GRB 131108A: NOT optical observations
  30. GRB 131108A: Swift detection of a possible X-ray afterglow
  31. GRB 131108A Tiled Swift observations
  32. GRB 131108A: Fermi-LAT onboard detection of a burst
  33. GRB 131030A: RATIR Optical and NIR Upper Limits
  34. GRB 131030A: Continued RATIR Optical and NIR Observations
  35. GRB 131031A: Swift-XRT afterglow confirmation
  36. GRB 131029A: Suzaku WAM observation of the prompt emission
  37. GRB 131105A, Swift-BAT refined analysis
  38. GRB 131105A: Swift-XRT refined Analysis
  39. GRB 131103A: Swift-BAT refined analysis
  40. GRB 131030A: Swift-BAT refined analysis
  41. GRB 131105A: Fermi GBM observation
  42. GRB 131105A: Swift/UVOT Upper Limits
  43. GRB 131024B: Suzaku WAM observation of the prompt emission
  44. Konus-Wind observation of GRB 131105A
  45. GRB 131105A: TAROT La Silla observatory optical observations
  46. GRB 131105A: Enhanced Swift-XRT position
  47. GRB 131105A: Swift detection of a burst
  48. GRB 131030A: Continued RATIR Optical and NIR Observations
  49. GRB 131103A: Swift/UVOT Detection
  50. GRB 131103A: Enhanced Swift-XRT position
  51. GRB 131103A: Swift-XRT refined Analysis
  52. GRB 131103A: Swift detection of a burst
  53. GRB 131031A: RATIR Optical and NIR Observations and Upper Limits
  54. GRB 131018B: RATIR Optical/NIR Observations
  55. GRB 131031A: Fermi GBM detection
  56. GRB 131031A: Swift/UVOT Upper Limits
  57. GRB 131018B: Further Swift-XRT observations.
  58. GRB 131030A - RoboPol optical afterglow polarimetry
  59. GRB 131030A: Bassano Bresciano Observatory optical observations
  60. GRB 131031A: Swift-XRT observations
  61. GRB 131030A: P60 observations
  62. GRB 131031A: 1.23m CAHA I-band and 1.5m OSN R-band observations of Swift/BAT error circle
  63. GRB 131031A found in ground analysis of BAT data
  64. GRB 131030A: TAROT La Silla observatory optical observations
  65. GRB 131030A: Swift-XRT refined Analysis
  66. GRB 131030A: Enhanced Swift-XRT position
  67. GRB 131024C: ICSP discovery of a burst in X-rays by balloon borne study
  68. GRB 131030A: Swift/UVOT Detection
  69. Konus-Wind observation of GRB 131030A
  70. GRB 131030A: SAO RAS optical observations
  71. GRB 131030A: D50+BART detection and light curve optical decay
  72. GRB 131030A - Liverpool Telescope Optical Afterglow Confirmation
  73. GRB 131030A: MASTER optical observation
  74. GRB 131029A: Swift-XRT follow up
  75. GRB 131030A: Swift detection of a burst with an optical counterpart
  76. GRB 131029A Tiled Swift observations
  77. GRB 131029A: Fermi-LAT detection of a burst
  78. IPN Triangulation of GRB 131028A (long/bright)
  79. Swift 575905/GRB 131026A: optical observations
  80. Swift-BAT Trigger 575905 is probably not a real source
  81. GRB 131024B: AAO optical upper limit
  82. GRB 131024B: Mondy optical upper limits
  83. GRB 131024B: MASTER prompt optical observation
  84. Swift Trigger 575905/ GRB 131026A: MITSuME Okayama and Ishigakijima Optical upper limits
  85. Swift Trigger 575905/possible GRB 131026A: Swift-XRT observations
  86. Swift Trigger 575905: ROTSE-III Optical Limits
  87. Swift Trigger 575905: KAIT Optical Upper Limit
  88. GRB 131026A: TAROT La Silla observatory optical observations
  89. Swift Trigger 575905: a possible GRB
  90. GRB 131024B, Swift-BAT refined analysis
  91. GRB 131024B: Fermi GBM observation
  92. GRB 131024B: RATIR Optical and NIR Observations
  93. GRB 131024B: Swift/UVOT Upper Limits
  94. GRB 131024B: Swift-XRT refined Analysis
  95. GRB 131024A: Swift/UVOT Upper Limits
  96. GRB 131024B: Enhanced Swift-XRT position
  97. GRB 131024A: Swift-XRT refined Analysis
  98. GRB 131024B: Swift detection of a burst
  99. GRB 131024A, Swift-BAT refined analysis
  100. GRB 131024A: Skynet R-COP optical observations

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