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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"

27116 results found.

  1. GRB 150523A: Swift/UVOT Detection
  2. GRB 150523A: LCOGT Cerro-Tololo optical afterglow candidate
  3. Confirmation that Swift Trigger 641332 is not astrophysical
  4. GRB 150523A: Fermi-LAT detection
  5. GRB 150523A: Fermi GBM detection
  6. Swift trigger 641332 is probably not an astrophysical source
  7. GRB 150518A: Continued RATIR optical observations
  8. GRB 150518A: MASTER-net before, early and after optical stereoscopic observations with possible MP discovery inside MAXI error box
  9. Konus-Wind observation of GRB 150518A
  10. GRB 150518A : Xinglong TNT upper limit
  11. GRB 150518A: RATIR optical observations
  12. GRB 150518A: GMG observation
  13. Swift/UVOT observations of GRB150518A
  14. GRB 150514A: GROND Bright Afterglow Confirmation
  15. GRB 150514A: Swift/UVOT Detection
  16. GRB 150514A: Fermi GBM Detection
  17. GRB 150514A: Fermi-LAT detection
  18. GRB 150513A: Swift-BAT refined analysis
  19. GRB 150513A: Fermi GBM detection
  20. GRB 150513A: Fermi-LAT detection
  21. GRB 150512A: Fermi GBM detection
  22. GRB 150513A: Swift detection of a burst
  23. GRB 150512A: iPTF Optical Observations
  24. GRB 150510A: Fermi GBM detection
  25. GRB 150510A: Fermi-LAT Refined Analysis
  26. GRB 150510A: Fermi-LAT detection
  27. GRB 150423A: GMG observation limit
  28. Konus-Wind observation of GRB 150428A
  29. Confirmation that Swift Trigger 639636 is not astrophysical
  30. Swift Trigger 639636: a possible GRB
  31. GRB 150423A: JCMT SCUBA-2 sub-mm observation
  32. GRB 150430A: GROND Upper Limits
  33. GRB 150430A: Swift-BAT refined analysis
  34. GRB 150430A: Fermi GBM Detection
  35. GRB 150430A: Swift-XRT refined Analysis
  36. GRB 150430A: MAXI/GSC detection
  37. GRB 150430A: Swift/UVOT Upper Limits
  38. GRB 150430A: Swift detection of a burst
  39. GRB 150428B: Swift/UVOT Upper Limits
  40. GRB 150428A: Swift/UVOT Upper Limits
  41. GRB 150426A: Fermi GBM detection
  42. GRB 150428C: MASTER-net automatic optical inspection
  43. GRB 150428B: Swift-XRT refined Analysis
  44. GRB 150428B: MASTER-net prompt optical observation
  45. Fermi GBM trigger 150424722 is not a GRB
  46. GRB 150428A: MASTER-net early optical observation
  47. GRB 150428A: Swift-XRT refined Analysis
  48. GRB 150428B: Swift-BAT refined analysis
  49. GRB 150428A: Swift-BAT refined analysis
  50. GRB 150428A: RATIR optical observations
  51. GRB 150428A: P60 observations
  52. GRB 150428A: GROND Dark Burst Host Candidate
  53. GRB 150428B: Swift detection of a burst
  54. GRB 150428A: Swift detection of a burst
  55. Trigger 639199: Swift detection of IGRJ16418-4532
  56. GRB 150424A: RATIR Observations
  57. GRB 150424A: Swift-BAT refined analysis
  58. GRB 150424A: Swift-XRT refined Analysis
  59. GRB 150424A: spectral lag, extended-time emission
  60. GRB 150424A: GROND detects strong fading
  61. GRB 150424A: NOT optical observations
  62. GRB 150423A: VLT/X-shooter spectroscopy and tentative redshift
  63. GRB 150423A: Continued RATIR optical afterglow monitoring
  64. GRB 150424B: Fermi GBM detection
  65. GRB 150424A: Swift/UVOT Observations
  66. GRB 150424A: Keck detection of optical afterglow
  67. GRB 150424A: Swift detection of a short burst
  68. GRB 150423A: Swift-BAT refined analysis
  69. GRB 150423A: Swift/UVOT Upper Limits
  70. GRB 150423A: Swift-XRT refined Analysis
  71. GRB 150423A: RATIR optical afterglow monitoring
  72. GRB 150422A: Fermi GBM detection
  73. GRB 150423A: Keck optical afterglow confirmation
  74. GRB 150423A: GROND afterglow candidate
  75. GRB 150413A: Konus-Wind and Swift/BAT joint spectral analysis
  76. GRB 150423A: GROND observation
  77. GRB 150423A: Swift detection of a short burst
  78. GRB150418A: Swift/UVOT did not detect a new source
  79. Swift trigger 638589 is probably not an astrophysical source
  80. GRB 150416A: Fermi GBM detection
  81. Confirmation that Swift trigger 638217 is not an astrophysical source
  82. LOAO B, R Observations of GRB150413A
  83. Swift Trigger 638217 is probably not an astrophysical source
  84. GRB 150416A: Fermi-LAT detection
  85. GRB 150413A: GMG observation
  86. GRB 150413A: Bassano Bresciano Observatory optical observations
  87. GRB 150413A: Swift-BAT refined analysis
  88. GRB 150413A: P60 photometry
  89. GRB 150413A: Nanshan optical and radio follow-ups
  90. GRB 150413A: Khureltogot optical observations
  91. GRB 150413A: MASTER bright OT detection
  92. GRB 150413A: Swift detection of a burst
  93. Swift trigger 637807 is probably not an astrophysical source
  94. Swift detection of SAX J1808.4-3658
  95. GRB 150407A: Swift detection of a possible burst
  96. GRB 150403A: MASTER-net optical observation
  97. Swift triggered on a source in Terzan 5 (trigger=637212)
  98. GRB 150404A: Fermi GBM detection
  99. Konus-Wind observation of GRB 150403A
  100. Fermi trigger 449861706: MASTER-SAAO possible candidate to OT of Short GRB

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