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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"

27462 results found.

  1. GRB 141022A: Swift/UVOT Upper Limits
  2. GRB 141022A: Swift-BAT refined analysis
  3. GRB 141022A: Swift-XRT refined Analysis
  4. GRB141015A iTelescope observation
  5. GRB 141022A: GROND Detection of a possible Optical Afterglow Candidate
  6. GRB 141022A: Swift detection of a burst
  7. GRB 141004A: RATIR Late Time Optical and NIR Observations
  8. GRB 141020A: Swift-BAT refined analysis
  9. GRB 141020A: Swift-XRT refined Analysis
  10. GRB 141020A: Swift/UVOT Detection
  11. Konus-Wind observation of GRB 141017A
  12. GRB 141020A: Swift detection of a burst with an optical counterpart
  13. GRB 141017A, Swift-BAT refined analysis
  14. GRB 141017A: GROND Afterglow Confirmation
  15. GRB 141015A: Swift-XRT afterglow confirmation and refined Analysis
  16. GRB 141017A: Swift/UVOT Detection
  17. GRB 141017A: Swift-XRT refined Analysis
  18. GRB 141017A: Zadko observatory - Gingin optical observations
  19. GRB 141017A: Swift detection of a burst
  20. GRB 141015A: Swift/UVOT Upper Limits
  21. GRB 141015A: Swift-BAT refined analysis
  22. GRB 141015A: LCO-McDonald observations
  23. GRB 141015A: RATIR Optical Upper Limits
  24. GRB 141015A: Super-LOTIS early observations
  25. GRB 141015A: Swift/XRT localization
  26. GRB 141015A: Swift detection of a burst
  27. Fermi Gamma-ray Burst Monitor trigger 141014781 is not a GRB
  28. IPN Triangulation of GRB 141011A (short/hard)
  29. GRB 141011A: Fermi GBM detection
  30. Trigger 614903: Swift detection of IGR J17544-2619
  31. GRB 141005A: iTelescope.Net T21 Optical Observation
  32. GRB 141005A: Additional P60 imaging and afterglow confirmation
  33. GRB 141004A: Fermi GBM observation
  34. GRB 141004A: GROND observations
  35. GRB 141005A: GROND observations
  36. Konus-Wind observation of GRB 141005A
  37. GRB 141004A: Swift-XRT refined Analysis
  38. GRB 141005A: Swift-XRT refined Analysis
  39. GRB 141005A: Swift/UVOT Upper Limits
  40. GRB 141005A: Swift-BAT refined analysis
  41. GRB 141004A: Swift-BAT refined analysis
  42. GRB141004A: NOT imaging and spectroscopy
  43. GRB 141004A: Swift/UVOT Detection
  44. GRB 141005A: Fermi GBM Detection
  45. GRB 141004A: RATIR Optical Observations
  46. GRB 141004A: Monte Agliale Observatory optical observations
  47. GRB 141005A: RATIR Optical Observations
  48. GRB 141005A: P60 probable afterglow deteaction
  49. GRB 141005A: Swift detection of a burst
  50. GRB 141004A: Swift detection of a burst with an optical counterpart
  51. Swift observations of HD 305560
  52. GRB 140928A: Swift-XRT follow-up observations
  53. GRB 140930B: MASTER early possible OT detection
  54. Swift possible detection of the Be star HD 305560
  55. GRB 140930B: Gemini South Spectroscopy
  56. GRB 140930B: GROND observations
  57. GRB 140930A/MAXI J2259+524: MASTER optical observations
  58. GRB 140930B Swift-BAT refined analysis
  59. GRB 140930B: Swift/UVOT Upper Limits
  60. Konus-Wind observation of GRB 140930B
  61. GRB 140930B: Swift-XRT refined Analysis
  62. GRB 140928A: MAXI-GSC detection
  63. GRB 140930B: ISON-Kislovodsk observations
  64. GRB 140930B: MASTER early optical observations
  65. GRB 140930B: Swift detection of a short burst
  66. GRB 140928A: LCO-Cerro Tololo further observations
  67. IPN Triangulation of GRB 140928A
  68. GRB 140928A: LCO-Cerro Tololo observations
  69. GRB 140928A: Fermi GBM detection
  70. GRB 140928A: GROND Afterglow Candidate
  71. GRB 140928A: Swift-XRT observations
  72. GRB 140928A: Fermi-LAT detection
  73. GRB 140927A: Swift-BAT refined analysis
  74. GRB 140927A: Swift-XRT refined Analysis
  75. GRB 140927A: Swift detection of a burst
  76. Swift Trigger 613581 is not an astrophysical event
  77. Swift Trigger 613516 is not an astrophysical event
  78. GRB 140919A, Swift-BAT refined analysis
  79. GRB 140919A: Swift-XRT refined Analysis
  80. GRB 140919A: Swift/UVOT Detection
  81. GRB 140919A: GROND afterglow candidate
  82. GRB 140919A: Fermi GBM observation
  83. GRB 140919A: Swift/UVOT observations
  84. GRB 140919A: Swift-XRT observations
  85. GRB 140919A: Swift detection of a burst
  86. Swift detection of outburst from 4U 1700+24
  87. GRB 140916A: Swift/UVOT Upper Limits
  88. GRB 140916A: Swift-BAT refined analysis
  89. GRB 140916A: Swift-XRT refined Analysis
  90. GRB 140916B: iPTF Optical Observations
  91. GRB 140916A: FTS observations
  92. GRB 140916A: Swift detection of a burst
  93. GRB 140907A: Continued DCT Observations
  94. Fermi GBM trigger 140913075 is not a GRB
  95. GRB 140909A: Confirmation of the Swift-XRT afterglow
  96. GRB 140903A: Chandra detection of the afterglow
  97. GRB 140909A: Swift/UVOT Upper Limits
  98. GRB 140909A: Swift-XRT observations
  99. GRB 140909A: Swift detection of a GRB
  100. GRB 140907A: MASTER optical observations

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