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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"

43623 results found.

  1. GRB 131030A - RoboPol optical afterglow polarimetry
  2. GRB 131031A: MASTER optical observation
  3. Konus-Wind observation of GRB 131031A
  4. GRB 131030A: Bassano Bresciano Observatory optical observations
  5. GRB 131031A: 1.23m CAHA afterglow candidate
  6. GRB131030A : xinglong TNT optical observation
  7. GRB 131031A: Swift-XRT observations
  8. GRB 131030A: P60 observations
  9. GRB 131031A: 1.23m CAHA I-band and 1.5m OSN R-band observations of Swift/BAT error circle
  10. GRB 131031A found in ground analysis of BAT data
  11. GRB 131030A: RATIR Optical and NIR Observations
  12. GRB 131030A: TAROT La Silla observatory optical observations
  13. GRB 131030A: T21 optical observations
  14. GRB 131030A: Swift-XRT refined Analysis
  15. GRB 131030A: Enhanced Swift-XRT position
  16. GRB 131024C: ICSP discovery of a burst in X-rays by balloon borne study
  17. GRB 131030A: Swift/UVOT Detection
  18. Konus-Wind observation of GRB 131030A
  19. GRB 131030A: SAO RAS optical observations
  20. GRB 131030A: 1.23m CAHA BVRI-band observations
  21. GRB 131029A: Nanshan optical observations
  22. GRB 131030A: Spectroscopy from 10.4m GTC
  23. GRB 131030A: NOT redshift
  24. GRB 131030A - Liverpool Telescope Optical Afterglow Confirmation
  25. GRB 131030A: MASTER optical observation
  26. GRB 131030A: Swift detection of a burst with an optical counterpart
  27. GRB 131029A: Fermi GBM observation
  28. GRB 131029A Tiled Swift observations
  29. GRB 131029A: Fermi-LAT detection of a burst
  30. Konus-Wind observation of GRB 131028A
  31. IPN Triangulation of GRB 131028A (long/bright)
  32. GRB 131028A: Fermi GBM detection
  33. GRB 131011A: ATCA 34GHz upper limit
  34. Swift 575905/GRB 131026A: optical observations
  35. Swift-BAT Trigger 575905 is probably not a real source
  36. GRB 131024B: AAO optical upper limit
  37. GRB 131024B: Mondy optical upper limits
  38. GRB 131024B: MASTER prompt optical observation
  39. Swift Trigger 575905/possible GRB 131026A: Swift-XRT observations
  40. Swift Trigger 575905: ROTSE-III Optical Limits
  41. GRB 131026A: TAROT La Silla observatory optical observations
  42. Swift Trigger 575905: a possible GRB
  43. GRB 131024B, Swift-BAT refined analysis
  44. GRB 131024B: Fermi GBM observation
  45. GRB 131024B: RATIR Optical and NIR Observations
  46. GRB 131024B: Swift/UVOT Upper Limits
  47. GRB 131024B : Xinglong TNT upper limit
  48. GRB 131024B: Swift-XRT refined Analysis
  49. Fermi GBM trigger 13121024.436 is not a GRB
  50. GRB 131024B: Nanshan optical upper limit
  51. GRB 131024B: Enhanced Swift-XRT position
  52. GRB 131024A: GROND upper limits
  53. GRB 131024A: Swift-XRT refined Analysis
  54. GRB 131024B: Swift detection of a burst
  55. GRB 131024A, Swift-BAT refined analysis
  56. GRB 131024A: Skynet R-COP optical observations
  57. Konus-Wind observation of GRB 131011B
  58. GRB 131024A: Enhanced Swift-XRT position
  59. IPN triangulation of GRB 131011B (Swift Trigger 574266)
  60. GRB 131024A: Swift detection of a burst
  61. GRB 131014A: RATIR Optical/NIR Afterglow Retraction
  62. IPN Triangulation of GRB 131014A
  63. GRB 131018B: Swift-XRT observations
  64. GRB 131018B: Fermi GBM observation
  65. GRB 131018A: RATIR Optical and NIR Observations
  66. GRB 131018A: Swift/UVOT Upper Limits
  67. GRB 131018B: Fermi-LAT detection of a burst
  68. GRB 131018A: Swift-XRT refined Analysis
  69. GRB 131018A: KAIT Optical Upper Limit
  70. GRB 131018A, Swift-BAT refined analysis
  71. GRB 131018A: P60 Observations
  72. GRB 131018A: Enhanced Swift-XRT position
  73. GRB 131014A: XRT position information
  74. GRB131018A, optical observations
  75. GRB 131018A: Swift detection of a burst
  76. GRB 131014A: Suzaku WAM observation of the prompt emission
  77. GRB 131014A: GROND observations
  78. GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
  79. Fermi GBM data availability during U.S. government shutdown
  80. GRB 131014A: Swift-XRT refined Analysis
  81. GRB 131014A: Swift/UVOT Upper Limits
  82. Fermi 403206457 / GRB 131011A: AAO optical observations
  83. GRB 131014A: RATIR Optical and NIR Observations
  84. GRB 131014A: Enhanced XRT position
  85. Konus-Wind observation of GRB 131014A
  86. GRB 131014A: NOT afterglow candidate
  87. GRB 131014A: Nanshan optical observations
  88. GRB 131014A: Swift detection of a possible X-ray afterglow
  89. GRB 131014A Tiled Swift observations
  90. GRB 131014A: Fermi-LAT detection
  91. GRB 131014A: Fermi GBM detection
  92. GRB 131011A: Fermi GBM detection
  93. iPTF 13dsw/Fermi403206457: X-Shooter redshift
  94. Swift-XRT detection of iPTF 13dsw/Fermi403206457
  95. GRB 131011A: GROND afterglow observations
  96. Fermi403206457: continued P60 observations and fading behavior
  97. Fermi403206457: Weihai optical upper limit
  98. Fermi403206457: NOT optical observations
  99. Fermi403206457: iPTF detection of a possible optical afterglow
  100. Trigger 574266 is not a Swift detection of a known source

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