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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"

19611 results found.

  1. Swift/UVOT observations of GRB150518A
  2. GRB 150518A: Swift-XRT afterglow detection
  3. GRB 150518A: Tiled Swift observations
  4. GRB 150514A: Further Swift observations
  5. GRB 150514A: Swift/UVOT Detection
  6. GRB 150514A: Fermi GBM Detection
  7. GRB 150514A: Swift-XRT afterglow detection
  8. GRB 150514A: Swift ToO observations
  9. GRB 150513A: Swift-BAT refined analysis
  10. GRB 150513A: Fermi GBM detection
  11. GRB 150513A: Fermi-LAT detection
  12. GRB 150513A: Swift detection of a burst
  13. GRB 150510A: Fermi-LAT Refined Analysis
  14. GRB 150510A: Fermi-LAT detection
  15. Konus-Wind observation of GRB 150428A
  16. GRB 150423A: Chandra X-ray Observation
  17. Confirmation that Swift Trigger 639636 is not astrophysical
  18. Swift Trigger 639636: a possible GRB
  19. GRB 150430A: GROND Upper Limits
  20. GRB 150430A: Swift-BAT refined analysis
  21. Konus-Wind observation of GRB 150430A
  22. GRB 150430A: Fermi GBM Detection
  23. GRB 150430A: Swift-XRT refined Analysis
  24. GRB 150430A: Swift/UVOT Upper Limits
  25. GRB 150430A: Swift detection of a burst
  26. GRB 150428B: Swift/UVOT Upper Limits
  27. GRB 150428C: Swift-XRT observations
  28. GRB 150428A: Swift/UVOT Upper Limits
  29. GRB 150428B: Swift-XRT refined Analysis
  30. GRB 150428B: MASTER-net prompt optical observation
  31. GRB 150428A: MASTER-net early optical observation
  32. GRB 150428A: Swift-XRT refined Analysis
  33. GRB 150428B: Swift-BAT refined analysis
  34. GRB 150428C: Tiled Swift observations
  35. GRB 150428A: Swift-BAT refined analysis
  36. GRB 150428B: Enhanced Swift-XRT position
  37. GRB 150428A: RATIR optical observations
  38. GRB 150428A: Enhanced Swift-XRT position
  39. GRB 150428A: GROND Dark Burst Host Candidate
  40. GRB 150428B: Swift detection of a burst
  41. GRB 150428A: Swift detection of a burst
  42. Trigger 639199: Swift detection of IGRJ16418-4532
  43. GRB 150424A: Swift-BAT refined analysis
  44. GRB 150424A: Swift-XRT refined Analysis
  45. GRB 150424A: spectral lag, extended-time emission
  46. GRB 150424A: 10.4m GTC spectroscopy
  47. GRB 150424A: GROND detects strong fading
  48. GRB 150423A: VLT/X-shooter spectroscopy and tentative redshift
  49. GRB 150423A: Continued RATIR optical afterglow monitoring
  50. Konus-Wind observation of GRB 150424A
  51. GRB 150424A: Swift/UVOT Observations
  52. GRB 150424A: Enhanced Swift-XRT position
  53. GRB 150424B: Tiled Swift observations
  54. GRB 150424A: Swift detection of a short burst
  55. GRB 150423A: UKIRT NIR observations
  56. GRB 150423A: Swift-BAT refined analysis
  57. GRB 150423A: Swift/UVOT Upper Limits
  58. GRB 150423A: VLT detection
  59. GRB 150423A: Swift-XRT refined Analysis
  60. GRB 150423A: RATIR optical afterglow monitoring
  61. GRB 150423A: Enhanced Swift-XRT position
  62. GRB 150423A: GROND afterglow candidate
  63. GRB 150413A: Konus-Wind and Swift/BAT joint spectral analysis
  64. GRB 150423A: KAIT Optical Upper Limit
  65. GRB 150423A: GROND observation
  66. GRB 150423A: Swift detection of a short burst
  67. GRB150418A: Swift/UVOT did not detect a new source
  68. Further Swift XRT observations of GRB 150418A
  69. Swift trigger 638589 is probably not an astrophysical source
  70. GRB 150413A: Swift-XRT observations
  71. GRB 150418A: Swift-XRT observations
  72. GRB 150418A: Tiled Swift observations
  73. Confirmation that Swift trigger 638217 is not an astrophysical source
  74. LOAO B, R Observations of GRB150413A
  75. Swift Trigger 638217 is probably not an astrophysical source
  76. GRB 150413A: Bassano Bresciano Observatory optical observations
  77. Konus-Wind observation of a bright burst from SGR 1935+2154
  78. GRB 150413A: Swift-BAT refined analysis
  79. GRB 150413A: redshift determination with the 2.2m CAHA
  80. GRB 150413A: Khureltogot optical observations
  81. GRB 150413A: Swift detection of a burst
  82. Swift trigger 637807 is probably not an astrophysical source
  83. Swift detection of SAX J1808.4-3658
  84. Swift GRB150402A: further XRT observations
  85. GRB 150407A: Swift-XRT observations
  86. GRB 150407A: Swift detection of a possible burst
  87. GRB 150407A: Swift ToO observations
  88. GRB 150403A: MASTER-net optical observation
  89. Swift triggered on a source in Terzan 5 (trigger=637212)
  90. Konus-Wind observation of GRB 150403A
  91. GRB 150403A: Swift-BAT refined analysis
  92. GRB 150403A: Fermi GBM Detection
  93. GRB 150403A: Swift/UVOT Detection
  94. GRB 150323C: additional optical observations in Mondy
  95. GRB 150323C: Khureltogot optical observations
  96. GRB 150403A: Swift-XRT refined Analysis
  97. GRB 150403A: Fermi-LAT detection
  98. GRB 150403A: Enhanced Swift-XRT position
  99. GRB 150403A: Swift detection of a burst with an optical counterpart
  100. GRB 150402A: results of Swift observations

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