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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"

28103 results found.

  1. GRB 150616A: Swift-XRT refined Analysis
  2. Konus-Wind observation of Galactic transient V404 Cyg in outburst
  3. GRB 150616A: Enhanced Swift-XRT position
  4. GRB 150616A: Swift detection of a burst
  5. V404 Cyg: Swift/UVOT Detection
  6. GRB 150615A, Swift-BAT refined analysis
  7. Swift trigger 643949 is V404 Cyg
  8. GRB 150615A: Swift-XRT refined Analysis
  9. GRB 150608A: Swift-XRT follow-up observations
  10. GRB 150615A: Swift/UVOT Detection
  11. GRB 150615A: Enhanced Swift-XRT position
  12. GRB 150615A: Swift detection of a burst
  13. GRB 150608A: MITSuME Akeno optical upper limits
  14. Trigger 643078: Swift detection of H1743-322
  15. Konus-Wind observation of GRB 150608A
  16. GRB 150608A: Swift-XRT afterglow detection
  17. GRB150607A: AAO and CrAO optical observations
  18. GRB150607A: Discovery Channel Telescope Optical Observations
  19. GRB 150608A: MAXI/GSC detection
  20. Konus-Wind observation of GRB 150607A
  21. GRB 150607A: Swift-XRT refined Analysis
  22. GRB 150607A: Swift/UVOT Detection
  23. GRB 150607A: NOT optical observations
  24. GRB 150607A: Swift-BAT refined analysis
  25. GRB 150607A: Enhanced Swift-XRT position
  26. GRB 150607A: Swift detection of a burst with an optical counterpart
  27. GRB 150518A: possible SN observations
  28. Swift trigger 642453 is not an astrophysical source
  29. Swift Trigger 642453: a possible GRB
  30. GRB 150530B: Swift-XRT observations
  31. GRB 150527A: Continued RATIR Observations
  32. GRB 150530A: RATIR Optical Observations
  33. GRB 150530A: Swift-XRT refined Analysis
  34. GRB 150530A: Swift/UVOT Upper Limits
  35. GRB 150530A: Swift-BAT refined analysis
  36. GRB 150530A: Enhanced Swift-XRT position
  37. GRB 150530A: Swift detection of a burst
  38. GRB 150513A: Swift-XRT observations
  39. Konus-Wind observation of GRB 150527A
  40. GRB 150527A: Swift-XRT refined Analysis
  41. GRB 150527A: MITSuME Okayama upper limits
  42. GRB 150527A: Swift/UVOT Upper Limits
  43. GRB150527A: REM - NIR afterglow
  44. GRB 150527A: Swift-BAT refined analysis
  45. GRB 150527A: Enhanced Swift-XRT position
  46. GRB 150527A: LCOGT McDonald observations
  47. GRB 150527A: RATIR Afterglow Detection
  48. GRB 150523A: Suzaku WAM observation of the prompt emission
  49. GRB 150527A: Swift detection of a burst
  50. GRB 150523A: Swift/UVOT Detection
  51. GRB 150513A: request for X-ray follow up
  52. GRB 150523A: LCOGT FTS afterglow confirmation
  53. GRB 150523A: LCOGT Cerro-Tololo optical afterglow candidate
  54. GRB 150523A Swift-XRT afterglow detection
  55. GRB 150523A: Fermi GBM detection
  56. Swift trigger 641332 is probably not an astrophysical source
  57. GRB 150518A: Continued RATIR optical observations
  58. GRB 150518A: MAXI-GSC further analysis
  59. GRB 150518A: Mondy optical observations
  60. GRB 150518A: MASTER-net before, early and after optical stereoscopic observations with possible MP discovery inside MAXI error box
  61. GRB 150518A: Swift-XRT follow-up observations
  62. GRB 150518A: SAO RAS optical observations
  63. GRB 150518A: RATIR optical observations
  64. GRB 150518A: GMG observation
  65. GRB 150518A: Xinglong2.16m optical afterglow detection
  66. Swift/UVOT observations of GRB150518A
  67. GRB 150518A: Swift-XRT afterglow detection
  68. GRB 150518A: MAXI/GSC detection
  69. GRB 150514A: GROND Bright Afterglow Confirmation
  70. GRB 150514A: Swift/UVOT Detection
  71. GRB 150514A: Swift-XRT afterglow detection
  72. GRB 150513A: Swift-BAT refined analysis
  73. GRB 150513A: Fermi GBM detection
  74. GRB 150512A: iPTF Optical Observations
  75. GRB 150510A: Fermi GBM detection
  76. GRB 150424A: 9.8 GHz VLA detection
  77. GRB 150423A: GMG observation limit
  78. Konus-Wind observation of GRB 150428A
  79. GRB 150423A: Chandra X-ray Observation
  80. Swift Trigger 639636: a possible GRB
  81. GRB 150430A: GROND Upper Limits
  82. GRB 150430A: Swift-BAT refined analysis
  83. GRB 150430A: Swift-XRT refined Analysis
  84. GRB 150430A: MAXI/GSC detection
  85. GRB 150430A: Swift/UVOT Upper Limits
  86. GRB 150430A: Swift detection of a burst
  87. GRB 150428B: IRSF NIR upper limits
  88. GRB 150428B: Swift/UVOT Upper Limits
  89. GRB 150428C: Swift-XRT observations
  90. GRB 150428A: Swift/UVOT Upper Limits
  91. GRB 150413A: CrAO optical observations
  92. GRB 150426A: Fermi GBM detection
  93. GRB 150428B: Swift-XRT refined Analysis
  94. GRB 150428A: Swift-XRT refined Analysis
  95. GRB 150428B: Swift-BAT refined analysis
  96. GRB 150428A: Swift-BAT refined analysis
  97. GRB 150428B: Enhanced Swift-XRT position
  98. GRB 150428C/MAXI J0400+678: MAXI/GSC detection
  99. GRB 150428A: Danish1.56m optical observations
  100. GRB 150428A: RATIR optical observations

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