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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"

19662 results found.

  1. Konus-Wind observation of GRB 150607A
  2. GRB 150607A: Swift-XRT refined Analysis
  3. GRB 150607A: Swift/UVOT Detection
  4. GRB 150607A: Swift-BAT refined analysis
  5. GRB 150607A: Fermi GBM Detection
  6. GRB 150607A: Enhanced Swift-XRT position
  7. GRB 150607A: Swift detection of a burst with an optical counterpart
  8. Swift trigger 642453 is not an astrophysical source
  9. Swift Trigger 642453: a possible GRB
  10. Konus-Wind observation of GRB 150530A
  11. GRB 150530B: Swift-XRT observations
  12. GRB 150527A: Continued RATIR Observations
  13. Swift Triggers 642296 and 642297 are not GRBs
  14. GRB 150530B: Swift ToO observations
  15. GRB 150530B detected in ground analysis of BAT data
  16. GRB 150530A: RATIR Optical Observations
  17. GRB 150530A: Swift-XRT refined Analysis
  18. GRB 150530A: Swift/UVOT Upper Limits
  19. GRB 150530A: Fermi GBM observation
  20. GRB 150530A: Swift-BAT refined analysis
  21. GRB 150530A: Enhanced Swift-XRT position
  22. GRB 150530A: Swift detection of a burst
  23. GRB 150513A: Swift-XRT observations
  24. Konus-Wind observation of GRB 150527A
  25. GRB 150527A: Swift-XRT refined Analysis
  26. GRB 150527A: Swift/UVOT Upper Limits
  27. GRB 150527A: Swift-BAT refined analysis
  28. GRB 150527A: Enhanced Swift-XRT position
  29. GRB 150527A: Fermi GBM observation
  30. GRB 150527A: LCOGT McDonald observations
  31. GRB 150527A: RATIR Afterglow Detection
  32. GRB 150523A: Suzaku WAM observation of the prompt emission
  33. GRB 150527A: Swift detection of a burst
  34. GRB 150523A: Swift ToO observations
  35. GRB 150523A: Swift/UVOT Detection
  36. GRB 150513A: request for X-ray follow up
  37. GRB 150523A: LCOGT Cerro-Tololo optical afterglow candidate
  38. Confirmation that Swift Trigger 641332 is not astrophysical
  39. GRB 150523A Swift-XRT afterglow detection
  40. GRB 150523B: Swift ToO observations
  41. GRB 150523A: Fermi-LAT detection
  42. Swift trigger 641332 is probably not an astrophysical source
  43. GRB 150518A: Continued RATIR optical observations
  44. GRB 150518A: MAXI-GSC further analysis
  45. GRB 150518A: 6.0 GHz VLA detection
  46. Disreqard the recent cluster of Swift-related GCN Circulars
  47. GRB 150518A: MASTER-net before, early and after optical stereoscopic observations with possible MP discovery inside MAXI error box
  48. GRB 150518A: Swift-XRT follow-up observations
  49. GRB 150518A : Xinglong TNT upper limit
  50. GRB 150518A: RATIR optical observations
  51. GRB 150518A: GMG observation
  52. Swift/UVOT observations of GRB150518A
  53. GRB 150518A: Swift-XRT afterglow detection
  54. GRB 150518A: Tiled Swift observations
  55. GRB 150514A: Further Swift observations
  56. GRB 150514A: Swift/UVOT Detection
  57. GRB 150514A: Fermi GBM Detection
  58. GRB 150514A: Swift-XRT afterglow detection
  59. GRB 150514A: Swift ToO observations
  60. GRB 150513A: Swift-BAT refined analysis
  61. GRB 150513A: Fermi GBM detection
  62. GRB 150513A: Fermi-LAT detection
  63. GRB 150513A: Swift detection of a burst
  64. GRB 150510A: Fermi-LAT Refined Analysis
  65. GRB 150510A: Fermi-LAT detection
  66. Konus-Wind observation of GRB 150428A
  67. GRB 150423A: Chandra X-ray Observation
  68. Confirmation that Swift Trigger 639636 is not astrophysical
  69. Swift Trigger 639636: a possible GRB
  70. GRB 150430A: GROND Upper Limits
  71. GRB 150430A: Swift-BAT refined analysis
  72. Konus-Wind observation of GRB 150430A
  73. GRB 150430A: Fermi GBM Detection
  74. GRB 150430A: Swift-XRT refined Analysis
  75. GRB 150430A: Swift/UVOT Upper Limits
  76. GRB 150430A: Swift detection of a burst
  77. GRB 150428B: Swift/UVOT Upper Limits
  78. GRB 150428C: Swift-XRT observations
  79. GRB 150428A: Swift/UVOT Upper Limits
  80. GRB 150428B: Swift-XRT refined Analysis
  81. GRB 150428B: MASTER-net prompt optical observation
  82. GRB 150428A: MASTER-net early optical observation
  83. GRB 150428A: Swift-XRT refined Analysis
  84. GRB 150428B: Swift-BAT refined analysis
  85. GRB 150428C: Tiled Swift observations
  86. GRB 150428A: Swift-BAT refined analysis
  87. GRB 150428B: Enhanced Swift-XRT position
  88. GRB 150428A: RATIR optical observations
  89. GRB 150428A: Enhanced Swift-XRT position
  90. GRB 150428A: GROND Dark Burst Host Candidate
  91. GRB 150428B: Swift detection of a burst
  92. GRB 150428A: Swift detection of a burst
  93. Trigger 639199: Swift detection of IGRJ16418-4532
  94. GRB 150424A: Swift-BAT refined analysis
  95. GRB 150424A: Swift-XRT refined Analysis
  96. GRB 150424A: spectral lag, extended-time emission
  97. GRB 150424A: 10.4m GTC spectroscopy
  98. GRB 150424A: GROND detects strong fading
  99. GRB 150423A: VLT/X-shooter spectroscopy and tentative redshift
  100. GRB 150423A: Continued RATIR optical afterglow monitoring

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