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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"

37529 results found.

  1. GRB 131103A: Swift-XRT refined Analysis
  2. GRB 131103A: Swift detection of a burst
  3. GRB 131031A: RATIR Optical and NIR Observations and Upper Limits
  4. GRB131031A: RATIR Optical and NIR Observations
  5. GRB 131018B: RATIR Optical/NIR Observations
  6. GRB 131030A: Continued RATIR Optical and NIR Observations
  7. GRB 131030A: the 2nd epoch of SAO RAS observations
  8. GRB 131031A: Fermi GBM detection
  9. GRB 131031A: Swift/UVOT Upper Limits
  10. LOAO B,R Observation of GRB131030A
  11. GRB 131018B: Further Swift-XRT observations.
  12. GRB 131030A - RoboPol optical afterglow polarimetry
  13. GRB 131031A: MASTER optical observation
  14. Konus-Wind observation of GRB 131031A
  15. GRB 131030A: Bassano Bresciano Observatory optical observations
  16. GRB 131031A: 1.23m CAHA afterglow candidate
  17. GRB131030A : xinglong TNT optical observation
  18. GRB 131031A: Swift-XRT observations
  19. GRB 131030A: P60 observations
  20. GRB 131031A: 1.23m CAHA I-band and 1.5m OSN R-band observations of Swift/BAT error circle
  21. GRB 131031A found in ground analysis of BAT data
  22. GRB 131030A: RATIR Optical and NIR Observations
  23. GRB 131030A: TAROT La Silla observatory optical observations
  24. GRB 131030A: T21 optical observations
  25. GRB 131030A: Swift-XRT refined Analysis
  26. GRB 131030A: Enhanced Swift-XRT position
  27. GRB 131024C: ICSP discovery of a burst in X-rays by balloon borne study
  28. GRB 131030A: Swift/UVOT Detection
  29. Konus-Wind observation of GRB 131030A
  30. GRB 131030A: SAO RAS optical observations
  31. GRB 131030A: 1.23m CAHA BVRI-band observations
  32. GRB 131030A: D50+BART detection and light curve optical decay
  33. GRB 131029A: Nanshan optical observations
  34. GRB 131030A: Spectroscopy from 10.4m GTC
  35. GRB 131030A: NOT redshift
  36. GRB 131030A - Liverpool Telescope Optical Afterglow Confirmation
  37. GRB 131030A: MASTER optical observation
  38. GRB 131029A: Swift-XRT follow up
  39. GRB 131030A: Watcher OT detection
  40. GRB 131030A: Swift detection of a burst with an optical counterpart
  41. GRB 131029A: Fermi GBM observation
  42. GRB 131029A Tiled Swift observations
  43. GRB 131029A: Fermi-LAT detection of a burst
  44. Konus-Wind observation of GRB 131028A
  45. IPN Triangulation of GRB 131028A (long/bright)
  46. GRB 131028A: Fermi GBM detection
  47. GRB 131011A: ATCA 34GHz upper limit
  48. Swift 575905/GRB 131026A: optical observations
  49. GRB 131024B: AAO optical upper limit
  50. GRB 131024B: Mondy optical upper limits
  51. GRB 131024B: MASTER prompt optical observation
  52. Swift Trigger 575905/ GRB 131026A: MITSuME Okayama and Ishigakijima Optical upper limits
  53. Swift Trigger 575905/possible GRB 131026A: Swift-XRT observations
  54. Swift Trigger 575905: ROTSE-III Optical Limits
  55. Swift Trigger 575905: KAIT Optical Upper Limit
  56. GRB 131026A: TAROT La Silla observatory optical observations
  57. Swift Trigger 575905: a possible GRB
  58. GRB 131024B, Swift-BAT refined analysis
  59. GRB 131024B: Fermi GBM observation
  60. GRB 131024B: RATIR Optical and NIR Observations
  61. GRB 131024B: Swift/UVOT Upper Limits
  62. GRB 131024B : Xinglong TNT upper limit
  63. GRB 131024B: Swift-XRT refined Analysis
  64. Fermi GBM trigger 13121024.436 is not a GRB
  65. GRB 131024B: Nanshan optical upper limit
  66. GRB 131024A: Swift/UVOT Upper Limits
  67. GRB 131024B: Enhanced Swift-XRT position
  68. GRB 131024A: GROND upper limits
  69. GRB 131024A: Swift-XRT refined Analysis
  70. GRB 131024B: Swift detection of a burst
  71. GRB 131024A, Swift-BAT refined analysis
  72. GRB 131024A: Skynet R-COP optical observations
  73. Konus-Wind observation of GRB 131011B
  74. GRB 131024A: Enhanced Swift-XRT position
  75. IPN triangulation of GRB 131011B (Swift Trigger 574266)
  76. GRB 131024A: Swift detection of a burst
  77. GRB 131014A: RATIR Optical/NIR Afterglow Retraction
  78. IPN Triangulation of GRB 131014A
  79. GRB 131018B: Swift/UVOT Upper Limits
  80. GRB 131018B: Swift-XRT observations
  81. GRB 131018B: Fermi GBM observation
  82. GRB 131018A: RATIR Optical and NIR Observations
  83. GRB 131018A: Swift/UVOT Upper Limits
  84. GRB 131018B: Fermi-LAT detection of a burst
  85. GRB 131018A: Swift-XRT refined Analysis
  86. GRB 131018A: KAIT Optical Upper Limit
  87. GRB 131018A, Swift-BAT refined analysis
  88. GRB 131018A: P60 Observations
  89. GRB 131018A: Enhanced Swift-XRT position
  90. GRB 131014A: XRT position information
  91. GRB131018A, optical observations
  92. GRB 131018A: Swift detection of a burst
  93. GRB 131014A: Suzaku WAM observation of the prompt emission
  94. GRB 131014A: GROND observations
  95. GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
  96. Fermi GBM data availability during U.S. government shutdown
  97. GRB 131014A: Swift-XRT refined Analysis
  98. GRB 131011A: Swift/UVOT Upper Limits
  99. GRB 131014A: Swift/UVOT Upper Limits
  100. Fermi 403206457 / GRB 131011A: AAO optical observations

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