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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

15275 results found.

  1. GRB 150711A: Observations from the 2.5m NOT
  2. GRB 150710B: Swift ToO observations
  3. Konus-Wind observation of GRB 150710A (Swift trigger 648437)
  4. Konus-Wind observation of GRB 150702A
  5. GRB 150702A: Swift ToO observations
  6. GRB 150702A: Fermi-LAT detection
  7. GRB 150622A: Swift-XRT afterglow detection
  8. Konus-Wind observation of GRB 150627A
  9. V404 Cyg activity (Swift, Fermi, INTGRAL, KONUS, MAXI detection): optical observations in TSHAO, Khureltogot, and AAO
  10. GRB 150627A: Swift ToO observations
  11. GRB 150627A: Fermi-LAT detection
  12. GRB 150622A: Tiled Swift observations
  13. V404 Cyg outburst (Swift trigger 643949 ): TSHAO optical observations
  14. Konus-Wind observation of Galactic transient V404 Cyg in outburst
  15. GRB 150608A: Swift-XRT follow-up observations
  16. GRB 150608A: MITSuME Akeno optical upper limits
  17. Konus-Wind observation of GRB 150608A
  18. GRB150607A: Discovery Channel Telescope Optical Observations
  19. GRB 150608A: Tiled Swift observations
  20. Konus-Wind observation of GRB 150607A
  21. GRB 150607A: Fermi GBM Detection
  22. Konus-Wind observation of GRB 150530A
  23. GRB 150530B: Swift ToO observations
  24. Konus-Wind observation of GRB 150527A
  25. GRB 150527A: MITSuME Okayama upper limits
  26. GRB 150527A: Fermi GBM observation
  27. GRB 150527A: LCOGT McDonald observations
  28. GRB 150523A: Suzaku WAM observation of the prompt emission
  29. GRB 150523A: Swift ToO observations
  30. GRB 150513A: request for X-ray follow up
  31. Konus-Wind observation of GRB 150523A
  32. GRB 150523A: LCOGT FTS afterglow confirmation
  33. GRB 150523B: Swift ToO observations
  34. GRB 150523A: Fermi-LAT detection
  35. GRB 150523A: Fermi GBM detection
  36. GRB 150518A: Continued RATIR optical observations
  37. GRB 150518A: MAXI-GSC further analysis
  38. GRB 150518A: 6.0 GHz VLA detection
  39. GRB 150518A: MITSuME Akeno Optical observation
  40. Konus-Wind observation of GRB 150518A
  41. GRB 150518A: Swift-XRT follow-up observations
  42. GRB 150518A : Xinglong TNT upper limit
  43. GRB 150518A: Correction
  44. GRB 150518A: RATIR optical observations
  45. GRB 150518A: Tiled Swift observations
  46. Konus-Wind observation of GRB 150514A
  47. GRB 150514A: GROND Bright Afterglow Confirmation
  48. GRB 150514A: Swift ToO observations
  49. GRB 150514A: Fermi-LAT detection
  50. GRB 150513A: Fermi-LAT detection
  51. GRB 150512A: Fermi GBM detection
  52. Konus-Wind observation of GRB 150510A
  53. GRB 150510A: Fermi GBM detection
  54. GRB 150510A: Fermi-LAT Refined Analysis
  55. GRB 150510A: Fermi-LAT detection
  56. Konus-Wind observation of GRB 150428A
  57. GRB 150413A: AMI 15 GHz confirmation of radio counterpart
  58. Konus-Wind observation of GRB 150430A
  59. GRB 150430A: Fermi GBM Detection
  60. GRB 150428B: IRSF NIR upper limits
  61. GRB 150428C: Swift-XRT observations
  62. GRB 150428B: MASTER-net prompt optical observation
  63. GRB 150428A: MASTER-net early optical observation
  64. GRB 150428C: Tiled Swift observations
  65. GRB 150428A: Danish1.56m optical observations
  66. GRB 150428A: P60 observations
  67. GRB 150424A: NOT optical observations
  68. GRB 150423A: Continued RATIR optical afterglow monitoring
  69. Konus-Wind observation of GRB 150424A
  70. GRB 150424A: Swift/UVOT Observations
  71. GRB 150423A: TSHAO optical observations
  72. GRB 150424B: Tiled Swift observations
  73. GRB 150423A: MITSuME Okayama upper limits
  74. GRB 150423A: RATIR optical afterglow monitoring
  75. GRB 150423A: Keck optical afterglow confirmation
  76. GRB 150423A: GROND afterglow candidate
  77. GRB 150413A: Konus-Wind and Swift/BAT joint spectral analysis
  78. GRB 150423A: KAIT Optical Upper Limit
  79. Konus-Wind observation of GRB 150418A
  80. GRB150418A: Swift/UVOT did not detect a new source
  81. Further Swift XRT observations of GRB 150418A
  82. GRB 150418A: Tiled Swift observations
  83. GRB 150413A: MITSuME Akeno Optical observation
  84. GRB 150416A: Fermi-LAT detection
  85. GRB 150413A: Refined redshift
  86. Konus-Wind observation of a bright burst from SGR 1935+2154
  87. GRB150413A, optical observations
  88. GRB 150413A: Khureltogot optical observations
  89. GRB 150413A: Nanshan optical and radio follow-ups
  90. GRB 150413A: MAXI/GSC detection
  91. GRB 150407A: Swift ToO observations
  92. GRB 150404A: Fermi GBM detection
  93. Konus-Wind observation of GRB 150403A
  94. GRB 150323C: additional optical observations in Mondy
  95. GRB 150403A: Fermi-LAT detection
  96. GRB 150402A: Swift ToO observations
  97. Konus-Wind observation of GRB 150330A
  98. GRB 150323B: Swift-XRT afterglow detection
  99. GRB 150323C: MITSuME Akeno Optical observation
  100. GRB 150220A: Optical observations at Kyiv comet station

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