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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 161015A: Fermi GBM detection
  2. GRB 161015A: Fermi-LAT detection
  3. GRB161004A: Further analysis of the burst nature
  4. GRB 161014A: Fermi GBM observation
  5. GRB 161014A: Swift-XRT refined Analysis
  6. GRB 161014A: Swift/UVOT Detection
  7. GRB 161014A: Swift-XRT and UVOT afterglow detection
  8. GRB 161011A: Swift-XRT refined Analysis
  9. GRB 161010A: Swift-XRT afterglow detection
  10. GRB 161007A: Swift-XRT refined Analysis
  11. GRB 161001A: IRSF upper limits
  12. GRB 161004B: Fermi GBM detection
  13. GRB 161004B: Swift-XRT refined Analysis
  14. GRB 161004A: SAO RAS optical upper limit
  15. GRB 161004A: Swift-XRT refined Analysis
  16. GRB 161001A: Fermi GBM detection
  17. GRB 161001A: Swift-XRT refined Analysis
  18. GRB 160927A: Swift-XRT refined Analysis
  19. XRT refined analysis for GRB 160925A
  20. GRB 160925A: Optical spectroscopy of MASTER optical transient
  21. GRB 160917A: Fermi GBM observation
  22. GRB 160917A: Swift-XRT refined Analysis
  23. GRB 160912A: Swift-XRT refined Analysis
  24. GRB 160910A: Afterglow detection from OSN
  25. GRB 160910A: Swift-XRT afterglow detection
  26. GRB 160910A: Fermi-LAT detection
  27. GRB 160910A: Fermi GBM observation
  28. GRB 160905A: Swift-XRT refined Analysis
  29. GRB 160905A: Fermi-LAT detection
  30. GRB 160905A: Fermi GBM observation
  31. GRB 160829A: Swift-XRT observations
  32. GRB 160829A: Fermi GBM Detection
  33. GRB 160829A: Fermi-LAT detection of a short GRB
  34. Swift trigger 710022 is not astrophysical
  35. GRB 160825A: not localized by Swift
  36. GRB 160820A: Fermi GBM observation
  37. GRB 160826A: Swift-XRT refined Analysis
  38. GRB 160824A: Swift-XRT refined Analysis
  39. GRB 160824B: Fermi GBM detection
  40. GRB 160822672: Fermi GBM detection
  41. GRB 160821B: Fermi GBM Detection
  42. GRB 160821B: Swift-XRT refined Analysis
  43. GRB 160821A: Fermi-LAT refined analysis
  44. GRB 160821A: Fermi GBM Detection
  45. GRB 160821A: Fermi-LAT detection of a bright burst
  46. GRB 160819A: Fermi GBM detection
  47. GRB 160815A: GWAC-F60A upper limit
  48. GRB 160816A: Swift-XRT afterglow detection
  49. GRB 160816730A: Fermi GBM detection/observation
  50. GRB 160816A: Fermi-LAT detection
  51. GRB 160815A: Swift-XRT refined Analysis
  52. GRB 160815A: Fermi GBM detection/observation
  53. IceCube 160806A: Lomonosov BDRG gamma ray prompt observations
  54. GRB 160806A: Fermi GBM observation
  55. Swift Trigger 707517 is not an astrophysical event
  56. GRB 160804A: Fermi GBM observation
  57. GRB 160804A: Swift-XRT refined Analysis
  58. GRB 160802A: Lomonosov BDRG gamma ray detection
  59. GRB 160801A: SAO RAS optical observations
  60. GRB 160802A: Fermi GBM detection
  61. GRB 160801A: Swift-XRT refined Analysis
  62. Swift follow up of IceCube-160731A
  63. HAWC follow up of IceCube 160731
  64. GRB 160726A: Fermi GBM observation
  65. GRB 160720A: Fermi GBM detection
  66. GRB 160716A: Swift-XRT refined Analysis
  67. GRB 160714A: Swift-XRT observations
  68. GRB 160714A: Fermi GBM observation
  69. GRB 160714A: Swift-XRT observations
  70. GRB 160712A: Swift-XRT refined Analysis
  71. GRB 160625B: TSHAO optical observations
  72. GRB 160709A: Swift-XRT observations
  73. GRB 160709A: Fermi GBM Observations
  74. GRB 160709A: Fermi-LAT detection
  75. GRB 160705B: Swift-XRT refined Analysis
  76. GRB 160703A: Swift-XRT afterglow detection
  77. GRB 160625B: SAO RAS monitoring
  78. GRB 160629A: Swift-XRT afterglow detection
  79. GRB 160630A: Swift/UVOT Upper Limits
  80. GRB 160630A: Swift-XRT refined Analysis
  81. GRB 160629A: Fermi GBM observation
  82. GRB 160623A: SAO RAS optical observations
  83. GRB 160625B: SAO RAS optical observations
  84. GRB 160625A: Swift-XRT refined Analysis
  85. GRB 160625B: Fermi GBM refined analysis
  86. GRB 160625B: Fermi-LAT refined analysis
  87. GRB 160625B: Swift-XRT afterglow detection
  88. GRB 160625B: Fermi-LAT detection of a bright burst
  89. GRB 160624A: Swift-XRT refined Analysis
  90. GRB 160624A: Fermi GBM observation
  91. Swift detection of a dust-scattered halo around GRB 160623A
  92. GRB 160623A: Swift-XRT afterglow detection
  93. GRB 160623A / Galactic transient: Fermi-LAT detection
  94. SGR 1617-5103 (BAT trigger 700791): Enhanced Swift-XRT position.
  95. BAT trigger 700791 (possible GRB 160622A) is SNR RCW 103
  96. GRB 160612A: Swift-XRT observations
  97. GRB 160612A: Fermi GBM detection
  98. GRB 160611A: Swift-XRT refined Analysis
  99. GRB 160607A: Swift-XRT refined Analysis
  100. GRB160601A: Kanata Telescope I- and Ks-bands upper limits

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Download all Circulars as a .tar.gz archive:
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