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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"

19666 results found.

  1. Swift Trigger 831888: a possible GRB or Galactic transient
  2. GRB 180510B: Enhanced Swift-XRT position
  3. GRB 180510B: Swift detection of a burst with an optical counterpart
  4. GRB 180510A: Swift detection of a burst
  5. GRB 180504A: Swift/UVOT Upper Limits
  6. GRB 180504A: Swift-BAT refined analysis
  7. Correction to Swift-XRT light curve fit for GRB 180504A in GCN 22685
  8. GRB 180504A: Swift-XRT refined Analysis
  9. GRB 180504A: Prompt enhanced Swift-XRT position
  10. GRB 180504A: Swift detection of a burst
  11. IPN Triangulation of GRB 180427A
  12. Swift Trigger 829046 is probably noise
  13. GRB 180425A: Swift-XRT refined Analysis
  14. GRB 180425A: Swift-BAT refined analysis
  15. GRB 180425A: Swift/UVOT Upper Limits
  16. GRB 180425A: Enhanced Swift-XRT position
  17. GRB 180425A: Swift detection of a burst
  18. GRB 180418A: TAROT La Silla observatory early optical observations
  19. GRB 180418A : SQUEAN observations
  20. GRB 180418A: Further GROND observations
  21. GRB 180418A: Swift/UVOT Detection
  22. GRB 180418A GROND observations
  23. GRB 180418A: Swift-BAT refined analysis
  24. GRB 180418A: 1.5m OSN optical observations
  25. GRB 180418A: Fermi GBM observation
  26. GRB 180418A: Swift-XRT refined Analysis
  27. LIGO/Virgo G299232: LOFAR follow-up
  28. GRB 180418A: Enhanced Swift-XRT position
  29. GRB 180418A: Swift-XRT observations
  30. GRB 180418A: LCO FTN afterglow confirmation
  31. GRB 180418A: KAIT Optical Afterglow Candidate
  32. GRB 180418A: Swift detection of a short burst
  33. GRB 180404B: AstroSat CZTI detection
  34. GRB 180409A: Swift-XRT afterglow detection
  35. GRB 180411A: CALET Gamma-Ray Burst Monitor detection
  36. Konus-Wind observation of GRB 180411A
  37. GRB 180411A: Swift/UVOT Upper Limit
  38. GRB 180410A: Fermi GBM observation
  39. GRB 180411A: Fermi GBM detection
  40. GRB 180411A: Swift-BAT refined analysis
  41. GRB 180411A: Swift-XRT refined Analysis
  42. GRB 180410A: RATIR Optical Observations
  43. GRB 180411A: Swift detection of a burst
  44. GRB 180410A: Swift-XRT refined Analysis
  45. GRB 180410A: Swift-BAT refined analysis
  46. GRB 180410A: Swift/UVOT Upper Limits
  47. GRB 180409A: Swift-XRT observations
  48. GRB 180410A: Enhanced Swift-XRT position
  49. GRB 180410A: Swift detection of a burst or a Galactic transient.
  50. IPN Triangulation of GRB 180409A
  51. GRB 180409A: Tiled Swift observations
  52. GRB 180402A: ISON-NM early optical limits
  53. GRB 180407A: Swift-BAT refined analysis
  54. Swift Trigger 823014: TAROT Calern observatory optical observations
  55. GRB 180407A: COATLI Upper Limits
  56. Swift Trigger 823014 is probably not a GRB
  57. GRB 180407A: Swift detection of a burst
  58. GRB 180404B: Swift/UVOT Detection
  59. Konus-Wind observation of GRB 180404B
  60. GRB 180404A: Swift/UVOT Detection
  61. GRB 180404A: LCO FTS observations
  62. GRB 180404A: Swift-XRT refined Analysis
  63. GRB 180404B: Swift-BAT refined analysis
  64. GRB 180402A: Fermi GBM refined spectral analysis
  65. GRB 180404A: Swift-BAT refined analysis
  66. GRB 180404B: Swift-XRT refined Analysis
  67. GRB 180404B: Fermi GBM observation
  68. GRB 180404B: MASTER-OAFA OT observation
  69. GRB 180404B: Enhanced Swift-XRT position
  70. GRB 180404A: MASTER-OAFA OT observation
  71. GRB 180404A: Enhanced Swift-XRT position
  72. GRB 180404B: Swift detection of a burst with an optical counterpart
  73. GRB 180404A: Swift detection of a burst with an optical afterglow
  74. Konus-Wind observation of GRB 180402A
  75. GRB 180402A: Swift/UVOT Upper Limits
  76. GRB 180402A: Swift-XRT refined Analysis
  77. GRB 180402A: Fermi GBM detection
  78. GRB 180402A, Swift-BAT refined analysis
  79. GRB 180402A: KAIT Optical Upper Limit
  80. GRB 180402A: RATIR Upper Limits
  81. GRB 180402A: LCO McDonald observations
  82. GRB 180402A: Swift detection of a possibly short burst
  83. GRB 180331B: Swift/UVOT Upper Limits
  84. GRB 180331B: Swift-XRT refined Analysis
  85. GRB 180331B: Swift-BAT refined analysis
  86. GRB 180331B: Enhanced Swift-XRT position
  87. GRB 180331A: Swift-BAT refined analysis
  88. GRB 180331B: Swift detection of a burst
  89. GRB 180331A: Swift-XRT refined Analysis
  90. GRB 180329B: LCO FTS observations
  91. GRB 180331A: Swift/UVOT Upper Limits
  92. GRB 180331A: Enhanced Swift-XRT position
  93. GRB 180331A: Swift detection of a burst
  94. GRB 180329B: Swift-BAT refined analysis
  95. GRB 180329B: Swift/UVOT Detection
  96. GRB 180329B: RATIR Optical Observations
  97. Swift Trigger 819863 is not a GRB
  98. GRB 180329B: NOT optical afterglow detection
  99. GRB 180329A: Swift-BAT refined analysis
  100. GRB 180329B: Swift-XRT refined Analysis

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