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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"

19608 results found.

  1. GRB 150514A: Swift-XRT afterglow detection
  2. GRB 150514A: Swift ToO observations
  3. GRB 150513A: Swift-BAT refined analysis
  4. GRB 150513A: Fermi GBM detection
  5. GRB 150513A: Fermi-LAT detection
  6. GRB 150513A: Swift detection of a burst
  7. GRB 150510A: Fermi-LAT Refined Analysis
  8. GRB 150510A: Fermi-LAT detection
  9. Konus-Wind observation of GRB 150428A
  10. GRB 150423A: Chandra X-ray Observation
  11. Confirmation that Swift Trigger 639636 is not astrophysical
  12. Swift Trigger 639636: a possible GRB
  13. GRB 150430A: GROND Upper Limits
  14. GRB 150430A: Swift-BAT refined analysis
  15. Konus-Wind observation of GRB 150430A
  16. GRB 150430A: Fermi GBM Detection
  17. GRB 150430A: Swift-XRT refined Analysis
  18. GRB 150430A: Swift/UVOT Upper Limits
  19. GRB 150430A: Swift detection of a burst
  20. GRB 150428B: Swift/UVOT Upper Limits
  21. GRB 150428C: Swift-XRT observations
  22. GRB 150428A: Swift/UVOT Upper Limits
  23. GRB 150428B: Swift-XRT refined Analysis
  24. GRB 150428B: MASTER-net prompt optical observation
  25. GRB 150428A: MASTER-net early optical observation
  26. GRB 150428A: Swift-XRT refined Analysis
  27. GRB 150428B: Swift-BAT refined analysis
  28. GRB 150428C: Tiled Swift observations
  29. GRB 150428A: Swift-BAT refined analysis
  30. GRB 150428B: Enhanced Swift-XRT position
  31. GRB 150428A: RATIR optical observations
  32. GRB 150428A: Enhanced Swift-XRT position
  33. GRB 150428A: GROND Dark Burst Host Candidate
  34. GRB 150428B: Swift detection of a burst
  35. GRB 150428A: Swift detection of a burst
  36. Trigger 639199: Swift detection of IGRJ16418-4532
  37. GRB 150424A: Swift-BAT refined analysis
  38. GRB 150424A: Swift-XRT refined Analysis
  39. GRB 150424A: spectral lag, extended-time emission
  40. GRB 150424A: 10.4m GTC spectroscopy
  41. GRB 150424A: GROND detects strong fading
  42. GRB 150423A: VLT/X-shooter spectroscopy and tentative redshift
  43. GRB 150423A: Continued RATIR optical afterglow monitoring
  44. Konus-Wind observation of GRB 150424A
  45. GRB 150424A: Swift/UVOT Observations
  46. GRB 150424A: Enhanced Swift-XRT position
  47. GRB 150424B: Tiled Swift observations
  48. GRB 150424A: Swift detection of a short burst
  49. GRB 150423A: UKIRT NIR observations
  50. GRB 150423A: Swift-BAT refined analysis
  51. GRB 150423A: Swift/UVOT Upper Limits
  52. GRB 150423A: VLT detection
  53. GRB 150423A: Swift-XRT refined Analysis
  54. GRB 150423A: RATIR optical afterglow monitoring
  55. GRB 150423A: Enhanced Swift-XRT position
  56. GRB 150423A: GROND afterglow candidate
  57. GRB 150413A: Konus-Wind and Swift/BAT joint spectral analysis
  58. GRB 150423A: KAIT Optical Upper Limit
  59. GRB 150423A: GROND observation
  60. GRB 150423A: Swift detection of a short burst
  61. GRB150418A: Swift/UVOT did not detect a new source
  62. Further Swift XRT observations of GRB 150418A
  63. Swift trigger 638589 is probably not an astrophysical source
  64. GRB 150413A: Swift-XRT observations
  65. GRB 150418A: Swift-XRT observations
  66. GRB 150418A: Tiled Swift observations
  67. Confirmation that Swift trigger 638217 is not an astrophysical source
  68. LOAO B, R Observations of GRB150413A
  69. Swift Trigger 638217 is probably not an astrophysical source
  70. GRB 150413A: Bassano Bresciano Observatory optical observations
  71. Konus-Wind observation of a bright burst from SGR 1935+2154
  72. GRB 150413A: Swift-BAT refined analysis
  73. GRB 150413A: redshift determination with the 2.2m CAHA
  74. GRB 150413A: Khureltogot optical observations
  75. GRB 150413A: Swift detection of a burst
  76. Swift trigger 637807 is probably not an astrophysical source
  77. Swift detection of SAX J1808.4-3658
  78. Swift GRB150402A: further XRT observations
  79. GRB 150407A: Swift-XRT observations
  80. GRB 150407A: Swift detection of a possible burst
  81. GRB 150407A: Swift ToO observations
  82. GRB 150403A: MASTER-net optical observation
  83. Swift triggered on a source in Terzan 5 (trigger=637212)
  84. Konus-Wind observation of GRB 150403A
  85. GRB 150403A: Swift-BAT refined analysis
  86. GRB 150403A: Fermi GBM Detection
  87. GRB 150403A: Swift/UVOT Detection
  88. GRB 150323C: additional optical observations in Mondy
  89. GRB 150323C: Khureltogot optical observations
  90. GRB 150403A: Swift-XRT refined Analysis
  91. GRB 150403A: Fermi-LAT detection
  92. GRB 150403A: Enhanced Swift-XRT position
  93. GRB 150403A: Swift detection of a burst with an optical counterpart
  94. GRB 150402A: results of Swift observations
  95. GRB 150402A: RATIR Optical Observations
  96. GRB 150402A: Swift ToO observations
  97. GRB 150402A detected in ground analysis of Swift-BAT data
  98. IPN Triangulation of GRB 150330A (long/very intense)
  99. GRB 150323B: Swift-XRT afterglow detection
  100. GRB 150323A: AAO optical observations

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