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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"

6520 results found.

  1. GRB 150811A: Swift-XRT refined Analysis
  2. GRB 150810A: Fermi GBM detection
  3. GRB 150727A: IRSF NIR observation
  4. GRB 150801A: Swift-XRT observations
  5. GRB 150801B: Swift-XRT refined Analysis
  6. GRB 150724B: Swift-XRT afterglow detection
  7. GRB 150728A: TSHAO optical observations
  8. GRB 150728A: Swift-XRT refined Analysis
  9. GRB 150727A: Swift-XRT refined Analysis
  10. GRB 150727A: Fermi GBM detection
  11. GRB 150724B: Swift-XRT observations
  12. GRB 150724B: Fermi GBM detection
  13. GRB 150724B: Fermi-LAT detection
  14. Correction to GCN 18059: Parameterisation of Swift-XRT light curve
  15. GRB 150724A: Swift-XRT refined Analysis
  16. GRB 150724A: Swift-BAT refined analysis
  17. GRB 150722A: Swift-XRT refined Analysis
  18. GRB 150721A: Fermi GBM detection
  19. GRB 150720A: Swift-XRT refined Analysis
  20. GRB 150716A: Swift-XRT refined Analysis
  21. GRB 150710B: Swift-XRT afterglow detection
  22. GRB 150710B: Swift-XRT and Swift-UVOT observations
  23. GRB 150711A: Swift-XRT refined Analysis
  24. GRB 150711A: Fermi GBM detection
  25. Swift-XRT observations of GRB 150710A
  26. GRB 150702A: Fermi GBM detection
  27. GRB 150702A: Swift-XRT observations
  28. GRB 150702A: Fermi-LAT detection
  29. Fermi GBM Observations is no longer triggerin on V404 Cyg
  30. GRB 150622A: Swift-XRT afterglow detection
  31. GRB 150627A: Swift-XRT afterglow detection
  32. GRB 150627A: Fermi GBM observation
  33. GRB 150626B: Swift-XRT refined Analysis
  34. GRB 150627A: Fermi-LAT detection
  35. GRB 150626A: Swift-XRT refined Analysis
  36. GRB 150622A: Swift-XRT observations
  37. GRB 150616A: Swift-XRT refined Analysis
  38. Konus-Wind observation of Galactic transient V404 Cyg in outburst
  39. GRB 150615A: Swift-XRT refined Analysis
  40. GRB 150608A: Swift-XRT follow-up observations
  41. GRB 150608A: Swift-XRT afterglow detection
  42. GRB 150607A: Swift-XRT refined Analysis
  43. GRB 150607A: Fermi GBM Detection
  44. Swift trigger 642453 is not an astrophysical source
  45. GRB 150530B: Swift-XRT observations
  46. GRB 150530A: Swift-XRT refined Analysis
  47. GRB 150530A: Fermi GBM observation
  48. GRB 150513A: Swift-XRT observations
  49. GRB 150527A: Swift-XRT refined Analysis
  50. GRB 150527A: Fermi GBM observation
  51. GRB 150523A Swift-XRT afterglow detection
  52. GRB 150523A: Fermi-LAT detection
  53. GRB 150523A: Fermi GBM detection
  54. GRB 150518A: Swift-XRT follow-up observations
  55. GRB 150518A: SAO RAS optical observations
  56. GRB 150518A: Swift-XRT afterglow detection
  57. GRB 150514A: Further Swift observations
  58. GRB 150514A: Fermi GBM Detection
  59. GRB 150514A: Swift-XRT afterglow detection
  60. GRB 150514A: Fermi-LAT detection
  61. GRB 150513A: Fermi GBM detection
  62. GRB 150513A: Fermi-LAT detection
  63. GRB 150512A: Fermi GBM detection
  64. GRB 150510A: Fermi GBM detection
  65. GRB 150510A: Fermi-LAT Refined Analysis
  66. GRB 150510A: Fermi-LAT detection
  67. Confirmation that Swift Trigger 639636 is not astrophysical
  68. GRB 150430A: Fermi GBM Detection
  69. GRB 150430A: Swift-XRT refined Analysis
  70. GRB 150428B: IRSF NIR upper limits
  71. GRB 150428C: Swift-XRT observations
  72. GRB 150426A: Fermi GBM detection
  73. GRB 150428B: Swift-XRT refined Analysis
  74. GRB 150428A: Swift-XRT refined Analysis
  75. GRB 150424A: Swift-XRT refined Analysis
  76. GRB 150424A: NOT optical observations
  77. GRB 150424B: Fermi GBM detection
  78. GRB 150423A: WHT observations
  79. GRB 150423A: Swift-XRT refined Analysis
  80. GRB 150422A: Fermi GBM detection
  81. GRB 150423A: GROND afterglow candidate
  82. GRB150418A: Swift/UVOT did not detect a new source
  83. Further Swift XRT observations of GRB 150418A
  84. GRB 150413A: Swift-XRT observations
  85. GRB 150418A: Swift-XRT observations
  86. GRB 150413A: RTT150 optical observations
  87. GRB 150416A: Fermi GBM detection
  88. Confirmation that Swift trigger 638217 is not an astrophysical source
  89. GRB 150413A: SAO RAS observations
  90. GRB 150416A: Fermi-LAT detection
  91. GRB 150413A
  92. Swift GRB150402A: further XRT observations
  93. GRB 150407A: Swift-XRT observations
  94. GRB 150404A: Fermi GBM detection
  95. GRB 150403A: Fermi GBM Detection
  96. GRB 150403A: Swift-XRT refined Analysis
  97. GRB 150403A: Fermi-LAT detection
  98. GRB 150402A: results of Swift observations
  99. GRB 150330A: Fermi GBM detection
  100. GRB 150323B: Swift-XRT afterglow detection

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