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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. GRB 160123A: TAROT La Silla observatory optical observations
  2. GRB 160127A: Enhanced Swift-XRT position
  3. GRB 160127A: TAROT La Silla observatory optical light curve
  4. GRB 160127A: Swift detection of a burst with an optical counterpart
  5. GRB 160123A: GROND Upper limits
  6. GRB 160121A: TSHAO optical observation
  7. GRB 160123A: Swift/UVOT Upper Limits
  8. GRB 160123A: Swift-XRT refined Analysis
  9. GRB 160123A: Swift-BAT refined analysis
  10. GRB 160123A: Enhanced Swift-XRT position
  11. GRB 160123A: Swift detection of a burst
  12. GRB 160121A: RATIR Optical Observations
  13. GRB 160121A: Swift-XRT refined Analysis
  14. GRB 160121A: Swift/UVOT Upper Limits
  15. GRB 160121A: GROND Afterglow observations
  16. GRB 160121A: TSHAO optical afterglow confirmation
  17. GRB 160121A: Swift-BAT refined analysis
  18. GRB 160121A: Enhanced Swift-XRT position
  19. GRB 160121A: 1.8m MOA optical afterglow detection
  20. GRB 160121A: MASTER-Amur observations
  21. GRB 160121A: Swift detection of a burst
  22. Konus-Wind observation of GRB 160119A
  23. GRB 160117A: Swift-XRT afterglow detection
  24. GRB 160119A: VLA Detection
  25. GRB 160117B: VLA Detection
  26. GRB160119A: BOOTES-2/TELMA Early Upper Limits
  27. GRB 160119A: Swift/UVOT Upper Limits
  28. GRB 160119A: GROND optical/NIR afterglow observations
  29. GRB 160117B: RATIR Optical and NIR Observations
  30. GRB 160119A: Swift-BAT refined analysis
  31. GRB 160119A: Swift-XRT refined Analysis
  32. GRB 160119A: Enhanced Swift-XRT position
  33. GRB 160119A: Swift detection of a burst
  34. GRB 160117A: Swift/UVOT Upper Limits
  35. GRB 151228B: AbAO optical upper limit
  36. GRB 160117A: Swift-XRT observations
  37. GRB 160117B: Swift-XRT refined Analysis
  38. GRB 160117A: Swift-BAT refined analysis
  39. GRB 160117B: Swift/UVOT Detection
  40. GRB 160117B: Enhanced Swift-XRT position
  41. GRB 160117B: LCOGT-SSO optical observations
  42. GRB 160117B: Swift detection of a burst with optical counterpart
  43. GRB 160117A: Swift detection of a burst
  44. IPN Triangulation of GRB 160113A
  45. LIGO/Virgo G211117: Further Swift-XRT sources
  46. IPN Triangulation of GRB 160111A (short/hard)
  47. GRB 160113A: Swift-XRT observations
  48. GRB 160113A: Swift ToO observations
  49. GRB 160113A: iPTF P48 Observations and Optical Transient Candidates
  50. GRB 160104A: Swift/UVOT Detection
  51. IPN Triangulation of GRB 151231A
  52. IPN Triangulation of GRB 151229B (extremely intense/long)
  53. LIGO/Virgo G211117: Swift observations of PS15dpn
  54. IPN Triangulation of GRB 151225A (short/hard)
  55. LIGO/Virgo G211117: Further Swift-XRT sources
  56. GRB 160104A: Nishi-Harima MINT Observations
  57. GRB 160104A: Swift-XRT refined Analysis
  58. GRB 160104A: Swift-BAT refined analysis
  59. GRB 160104A: Fermi GBM observation
  60. GRB 160104A: Mini-GWAC upper limit during prompt emission phase
  61. GRB 160104A: GWAC upper limit during prompt emission phase
  62. GRB 160104A: Enhanced Swift-XRT position
  63. GRB 160104A: LCOGT-FTN afterglow candidate
  64. GRB 160104A: Swift detection of a burst
  65. GRB 160102A: Swift-XRT observations
  66. GRB 160101A: MITSuME Akeno optical upper limits
  67. GRB 160102A: Tiled Swift observations
  68. GRB 160101A: Swift/UVOT Detection
  69. GRB 160101A: Fermi GBM observation
  70. GRB 160101A: Swift-XRT afterglow detection
  71. GRB 160101A: Tiled Swift observations
  72. Trigger 668949: Swift detection of V 404 Cyg
  73. MASTER-NET observations of V404Cyg Swift Trigger 668877
  74. Trigger 668879: Swift detection of V 404 Cyg again
  75. Trigger 668877: Swift detection of V 404 Cyg
  76. IPN Triangulation of GRB 151227B
  77. GRB 151228A: Correction to GCN 18770
  78. GRB 151228A: Swift-XRT refined Analysis
  79. V404Cyg Swift Trigger 668097: CrAO RT-22 radio observations
  80. V404Cyg Swift Trigger 668097: AbAO optical observations
  81. GRB 151228B: Swift/UVOT Detection
  82. GRB 151229A Swift-BAT Spectral lag analysis
  83. GRB 151228B: MITSuME Akeno optical upper limits
  84. GRB 151229A: Swift-XRT refined Analysis
  85. GRB 151229A: Fermi GBM observation
  86. GRB 151228B: Fermi GBM observation
  87. GRB 151228A: Swift-BAT refined analysis
  88. GRB 151229A: Swift/UVOT observations
  89. GRB 151228B: Swift-BAT refined analysis
  90. GRB 151229A: Swift-BAT refined analysis
  91. GRB 151229A: Enhanced Swift-XRT position
  92. GRB 151228B: Swift-XRT refined Analysis
  93. LIGO/Virgo G211117: Further Swift-XRT sources
  94. GRB 151229A: Swift detection of a short burst
  95. GRB 151228B: Enhanced Swift-XRT position
  96. GRB 151228B: Swift detection of a burst with an optical detection
  97. GRB 151228A: Fermi GBM observation
  98. LIGO/Virgo G211117: Further Swift-XRT sources
  99. LIGO/Virgo G211117: Swift-XRT sources
  100. GRB 151228A: Swift detection of a short burst

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