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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"

27419 results found.

  1. IBAS trigger 7015 is not a GRB
  2. GRB 150616A: Swift/UVOT Upper Limits
  3. GRB 150616A: Swift-BAT refined analysis
  4. V404 Cyg outburst (Swift trigger 643949 ): TSHAO optical observations
  5. GRB 150616A: Swift-XRT refined Analysis
  6. Konus-Wind observation of Galactic transient V404 Cyg in outburst
  7. GRB 150616A: Swift detection of a burst
  8. Fermi GBM trigger 150616734 is not a GRB
  9. Fermi GBM trigger 150616594 is not a GRB
  10. V404 Cyg: Swift/UVOT Detection
  11. Optical follow-up of Swift trigger on V404 Cyg
  12. GRB 150615A, Swift-BAT refined analysis
  13. Swift trigger 643949 is V404 Cyg
  14. GRB 150615A: Swift-XRT refined Analysis
  15. Fermi GBM trigger 150615574 is not a GRB
  16. GRB 150615A: Swift/UVOT Detection
  17. GRB 150615A: Swift detection of a burst
  18. Fermi GBM trigger 150613619 is not a GRB
  19. Fermi GBM trigger 150612648 is not a GRB
  20. Trigger 643078: Swift detection of H1743-322
  21. Konus-Wind observation of GRB 150608A
  22. Fermi Gamma-ray Burst Monitor trigger 455474712 / 150608698 is not a GRB
  23. GRB150607A: AAO and CrAO optical observations
  24. GRB150607A: Discovery Channel Telescope Optical Observations
  25. Konus-Wind observation of GRB 150607A
  26. GRB 150607A: Swift-XRT refined Analysis
  27. GRB 150607A: Swift/UVOT Detection
  28. GRB 150607A: NOT optical observations
  29. GRB 150607A: Swift-BAT refined analysis
  30. GRB 150607A: Fermi GBM Detection
  31. GRB 150607A: Swift detection of a burst with an optical counterpart
  32. Swift trigger 642453 is not an astrophysical source
  33. Swift Trigger 642453: a possible GRB
  34. Konus-Wind observation of GRB 150530A
  35. GRB 150530B: Swift-XRT observations
  36. GRB 150527A: Continued RATIR Observations
  37. Swift Triggers 642296 and 642297 are not GRBs
  38. GRB 150530B: Swift ToO observations
  39. GRB 150530B detected in ground analysis of BAT data
  40. GRB 150530A: RATIR Optical Observations
  41. GRB 150530A: Swift-XRT refined Analysis
  42. GRB 150530A: Swift/UVOT Upper Limits
  43. GRB 150530A: Fermi GBM observation
  44. GRB 150530A: Swift-BAT refined analysis
  45. GRB 150530A: Swift detection of a burst
  46. Fermi GBM trigger 150529948 is not a GRB
  47. GRB 150513A: Swift-XRT observations
  48. Konus-Wind observation of GRB 150527A
  49. GRB 150527A: Swift-XRT refined Analysis
  50. GRB 150527A: Swift/UVOT Upper Limits
  51. GRB150527A: REM - NIR afterglow
  52. GRB 150527A: Swift-BAT refined analysis
  53. GRB 150527A: Fermi GBM observation
  54. GRB 150527A: LCOGT McDonald observations
  55. GRB 150527A: RATIR Afterglow Detection
  56. GRB 150523A: Suzaku WAM observation of the prompt emission
  57. GRB 150527A: Swift detection of a burst
  58. GRB 150523A: Swift/UVOT Detection
  59. GRB 150523A: LCOGT Cerro-Tololo optical afterglow candidate
  60. Confirmation that Swift Trigger 641332 is not astrophysical
  61. GRB 150523A: Fermi-LAT detection
  62. GRB 150523A: Fermi GBM detection
  63. Swift trigger 641332 is probably not an astrophysical source
  64. GRB 150518A: Continued RATIR optical observations
  65. GRB 150518A: MASTER-net before, early and after optical stereoscopic observations with possible MP discovery inside MAXI error box
  66. Konus-Wind observation of GRB 150518A
  67. GRB 150518A : Xinglong TNT upper limit
  68. GRB 150518A: RATIR optical observations
  69. GRB 150518A: GMG observation
  70. Swift/UVOT observations of GRB150518A
  71. GRB 150514A: GROND Bright Afterglow Confirmation
  72. GRB 150514A: Swift/UVOT Detection
  73. GRB 150514A: Fermi GBM Detection
  74. GRB 150514A: Fermi-LAT detection
  75. GRB 150513A: Swift-BAT refined analysis
  76. GRB 150513A: Fermi GBM detection
  77. GRB 150513A: Fermi-LAT detection
  78. GRB 150512A: Fermi GBM detection
  79. GRB 150513A: Swift detection of a burst
  80. GRB 150512A: iPTF Optical Observations
  81. GRB 150510A: Fermi GBM detection
  82. GRB 150510A: Fermi-LAT Refined Analysis
  83. GRB 150510A: Fermi-LAT detection
  84. GRB 150423A: GMG observation limit
  85. Konus-Wind observation of GRB 150428A
  86. Confirmation that Swift Trigger 639636 is not astrophysical
  87. Swift Trigger 639636: a possible GRB
  88. GRB 150423A: JCMT SCUBA-2 sub-mm observation
  89. GRB 150430A: GROND Upper Limits
  90. GRB 150430A: Swift-BAT refined analysis
  91. Konus-Wind observation of GRB 150430A
  92. GRB 150430A: Fermi GBM Detection
  93. GRB 150430A: Swift-XRT refined Analysis
  94. GRB 150430A: MAXI/GSC detection
  95. GRB 150430A: Swift/UVOT Upper Limits
  96. GRB 150430A: Swift detection of a burst
  97. GRB 150428B: Swift/UVOT Upper Limits
  98. GRB 150428A: Swift/UVOT Upper Limits
  99. GRB 150426A: Fermi GBM detection
  100. GRB 150428C: MASTER-net automatic optical inspection

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Download all Circulars as a .tar.gz archive (updated once a day):
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