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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"

43628 results found.

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

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