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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"

37612 results found.

  1. GRB 150616A: Watcher optical upper limit
  2. IBAS trigger 7015 is not a GRB
  3. GRB 150616A: Swift/UVOT Upper Limits
  4. GRB 150616A: Swift-BAT refined analysis
  5. V404 Cyg outburst (Swift trigger 643949 ): TSHAO optical observations
  6. GRB 150616A: Swift-XRT refined Analysis
  7. Konus-Wind observation of Galactic transient V404 Cyg in outburst
  8. GRB 150616A: Enhanced Swift-XRT position
  9. GRB 150616A: Swift detection of a burst
  10. Fermi GBM trigger 150616734 is not a GRB
  11. Fermi GBM trigger 150616594 is not a GRB
  12. Fermi Gamma-ray Burst Monitor triggers bn150615791 and bn150615798 are not GRBs
  13. Optical follow-up of Swift trigger on V404 Cyg
  14. GRB 150615A, Swift-BAT refined analysis
  15. GRB 150615A: Swift-XRT refined Analysis
  16. Fermi GBM trigger 150615574 is not a GRB
  17. GRB 150608A: Swift-XRT follow-up observations
  18. GRB 150615A: Swift/UVOT Detection
  19. GRB 150615A: Enhanced Swift-XRT position
  20. GRB 150615A: Swift detection of a burst
  21. Fermi GBM trigger 150613619 is not a GRB
  22. Fermi GBM trigger 150612648 is not a GRB
  23. GRB 150608A: MITSuME Akeno optical upper limits
  24. Konus-Wind observation of GRB 150608A
  25. GRB 150608A: Swift-XRT afterglow detection
  26. Fermi Gamma-ray Burst Monitor trigger 455474712 / 150608698 is not a GRB
  27. GRB150607A: AAO and CrAO optical observations
  28. GRB150607A: Discovery Channel Telescope Optical Observations
  29. GRB 150608A: Tiled Swift observations
  30. GRB 150608A: MAXI/GSC detection
  31. Konus-Wind observation of GRB 150607A
  32. GRB 150607A: Swift-XRT refined Analysis
  33. GRB 150607A: Swift/UVOT Detection
  34. GRB 150607A: NOT optical observations
  35. GRB 150607A: Swift-BAT refined analysis
  36. GRB 150607A: Fermi GBM Detection
  37. GRB 150607A: Enhanced Swift-XRT position
  38. GRB 150607A: Swift detection of a burst with an optical counterpart
  39. GRB 150518A: possible SN observations
  40. Swift trigger 642453 is not an astrophysical source
  41. Swift Trigger 642453: a possible GRB
  42. Konus-Wind observation of GRB 150530A
  43. GRB 150530B: Swift-XRT observations
  44. GRB 150527A: Continued RATIR Observations
  45. GRB 150530B: Swift ToO observations
  46. GRB 150530B detected in ground analysis of BAT data
  47. GRB 150530A: RATIR Optical Observations
  48. GRB 150530A: Swift-XRT refined Analysis
  49. GRB 150530A: Swift/UVOT Upper Limits
  50. GRB 150530A: Fermi GBM observation
  51. GRB 150530A: Swift-BAT refined analysis
  52. GRB 150530A: Enhanced Swift-XRT position
  53. GRB 150530A: Swift detection of a burst
  54. Fermi GBM trigger 150529948 is not a GRB
  55. GRB 150513A: Swift-XRT observations
  56. Konus-Wind observation of GRB 150527A
  57. GRB 150527A: Swift-XRT refined Analysis
  58. GRB 150527A: MITSuME Okayama upper limits
  59. GRB 150527A: Swift/UVOT Upper Limits
  60. GRB150527A: REM - NIR afterglow
  61. GRB 150527A: Swift-BAT refined analysis
  62. GRB 150527A: Enhanced Swift-XRT position
  63. GRB 150527A: Fermi GBM observation
  64. GRB 150527A: LCOGT McDonald observations
  65. GRB 150527A: RATIR Afterglow Detection
  66. GRB 150523A: Suzaku WAM observation of the prompt emission
  67. GRB 150527A: Swift detection of a burst
  68. GRB 150523A: Swift ToO observations
  69. GRB 150523A: Swift/UVOT Detection
  70. GRB 150513A: request for X-ray follow up
  71. Konus-Wind observation of GRB 150523A
  72. GRB 150523A: LCOGT FTS afterglow confirmation
  73. GRB 150523A: LCOGT Cerro-Tololo optical afterglow candidate
  74. Confirmation that Swift Trigger 641332 is not astrophysical
  75. GRB 150523A Swift-XRT afterglow detection
  76. GRB 150523B: Swift ToO observations
  77. GRB 150523A: Fermi-LAT detection
  78. GRB 150523A: Fermi GBM detection
  79. GRB 150518A: Continued RATIR optical observations
  80. GRB 150518A: MAXI-GSC further analysis
  81. GRB 150518A: 6.0 GHz VLA detection
  82. GRB 150518A: MITSuME Akeno Optical observation
  83. GRB 150518A: Mondy optical observations
  84. GRB 150518A: AMI 15 GHz detection of possible radio counterpart
  85. GRB 150518A: MASTER-net before, early and after optical stereoscopic observations with possible MP discovery inside MAXI error box
  86. Konus-Wind observation of GRB 150518A
  87. GRB 150518A: Swift-XRT follow-up observations
  88. GRB 150518A : Xinglong TNT upper limit
  89. GRB 150518A: SAO RAS optical observations
  90. GRB 150518A: Correction
  91. GRB 150518A: VLT/X-shooter redshift of the likely host galaxy
  92. GRB 150518A: RATIR optical observations
  93. GRB 150518A: GMG observation
  94. GRB 150518A: Xinglong2.16m optical afterglow detection
  95. Swift/UVOT observations of GRB150518A
  96. GRB 150518A: Swift-XRT afterglow detection
  97. GRB 150518A: Tiled Swift observations
  98. GRB 150518A: MAXI/GSC detection
  99. GRB 150514A: Further Swift observations
  100. Konus-Wind observation of GRB 150514A

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