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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"

6667 results found.

  1. GRB 150518A: Swift-XRT follow-up observations
  2. GRB 150518A: SAO RAS optical observations
  3. GRB 150518A: Swift-XRT afterglow detection
  4. GRB 150514A: Further Swift observations
  5. GRB 150514A: Fermi GBM Detection
  6. GRB 150514A: Swift-XRT afterglow detection
  7. GRB 150514A: Fermi-LAT detection
  8. GRB 150513A: Fermi GBM detection
  9. GRB 150513A: Fermi-LAT detection
  10. GRB 150512A: Fermi GBM detection
  11. GRB 150510A: Fermi GBM detection
  12. GRB 150510A: Fermi-LAT Refined Analysis
  13. GRB 150510A: Fermi-LAT detection
  14. Confirmation that Swift Trigger 639636 is not astrophysical
  15. GRB 150430A: Fermi GBM Detection
  16. GRB 150430A: Swift-XRT refined Analysis
  17. GRB 150428B: IRSF NIR upper limits
  18. GRB 150428C: Swift-XRT observations
  19. GRB 150426A: Fermi GBM detection
  20. GRB 150428B: Swift-XRT refined Analysis
  21. GRB 150428A: Swift-XRT refined Analysis
  22. GRB 150424A: Swift-XRT refined Analysis
  23. GRB 150424A: NOT optical observations
  24. GRB 150424B: Fermi GBM detection
  25. GRB 150423A: WHT observations
  26. GRB 150423A: Swift-XRT refined Analysis
  27. GRB 150422A: Fermi GBM detection
  28. GRB 150423A: GROND afterglow candidate
  29. GRB150418A: Swift/UVOT did not detect a new source
  30. Further Swift XRT observations of GRB 150418A
  31. GRB 150413A: Swift-XRT observations
  32. GRB 150418A: Swift-XRT observations
  33. GRB 150413A: RTT150 optical observations
  34. GRB 150416A: Fermi GBM detection
  35. Confirmation that Swift trigger 638217 is not an astrophysical source
  36. GRB 150413A: SAO RAS observations
  37. GRB 150416A: Fermi-LAT detection
  38. GRB 150413A
  39. Swift GRB150402A: further XRT observations
  40. GRB 150407A: Swift-XRT observations
  41. GRB 150404A: Fermi GBM detection
  42. GRB 150403A: Fermi GBM Detection
  43. GRB 150403A: Swift-XRT refined Analysis
  44. GRB 150403A: Fermi-LAT detection
  45. GRB 150402A: results of Swift observations
  46. GRB 150330A: Fermi GBM detection
  47. GRB 150323B: Swift-XRT afterglow detection
  48. GRB 150323C: Nishi-Harima NIR Observations
  49. GRB 150323B: Swift-XRT observations
  50. GRB 150323C: Swift-XRT refined Analysis
  51. GRB150323C: Fermi GBM detection
  52. GRB 150323B: Fermi GBM observation
  53. GRB 150323A: Swift-XRT refined Analysis
  54. GRB 150318A: Swift-XRT refined Analysis
  55. GRB 150318A: Swift/UVOT Upper Limits
  56. GRB 150317A: Swift-XRT refined Analysis
  57. GRB 150317A: NOT optical observations
  58. GRB 150314A: Swift-XRT refined Analysis
  59. GRB 150314A: Fermi GBM observation
  60. GRB 150314A: Fermi-LAT detection
  61. GRB 150309A: Fermi GBM detection
  62. GRB 150309A: Swift-XRT refined Analysis
  63. Chandra X-ray observations of SWIFT J0045.2+4151 (aka Sw J0045 aka GRB 150301C aka p[PFH2005] 622)
  64. Further UVOT Observations of Swift J0045.2+4151
  65. Further X-ray observations of Swift J0045.2+4151 (aka Sw J0045 aka GRB 150301C aka [PFH2005] 622)
  66. GRB 150301C: XRT detection of a potential counterpart of BAT trigger 633105
  67. GRB 150302A: Swift-XRT refined Analysis
  68. GRB 150301B: Swift-XRT refined Analysis
  69. GRB 150301B: Fermi GBM detection
  70. GRB 150301A: Swift-XRT refined Analysis
  71. GRB 150301C : (Swift trigger 633105) Swift observations
  72. GRB 150301A: Fermi GBM observation
  73. GRB 150220A: Fermi GBM observation
  74. GRB 150220A: Swift-XRT observations
  75. GRB 150222A: Swift-XRT refined Analysis
  76. GRB 150219A: Fermi GBM observation
  77. GRB 150219A: Swift-XRT afterglow detection
  78. GRB 150213B: Swift-BAT refined analysis
  79. GRB 150213B: Swift-XRT refined Analysis
  80. GRB 150213A: Fermi GBM detection
  81. GRB 150212A: Swift-XRT refined Analysis
  82. GRB 150210A: Swift-XRT observations
  83. GRB 150211A: Swift-XRT refined Analysis
  84. GRB 150210A: Fermi-LAT detection
  85. GRB 150210A: Fermi GBM detection
  86. GRB 150101B/ Swift J123205.1-105602: Second epoch Chandra observations
  87. GRB 150202B: Swift/XRT afterglow confirmation
  88. GRB 150204A: Swift/XRT afterglow confirmation
  89. GRB 150206A: Swift-XRT refined Analysis
  90. GRB 150206B: Fermi GBM detection
  91. GRB 150204A: Swift-XRT observations
  92. GRB 150204A: Fermi GBM detection
  93. GRB 150202B: Swift XRT/UVOT observations
  94. Swift Trigger 629693 was a noise event
  95. GRB 150203A: Swift-XRT refined Analysis
  96. GRB 150202A: Swift-XRT refined Analysis
  97. GRB 150203A: Fermi GBM observation
  98. GRB 150202B: Fermi GBM detection
  99. GRB 150202B: Fermi-LAT detection
  100. GRB 150201A: Swift-XRT refined Analysis

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