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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"

21471 results found.

  1. GRB 081011: Enhanced Swift-XRT position
  2. GRB 081016: Swift-XRT candidate afterglow detection
  3. Swift detection of flare on CC Eri
  4. Trigger 331721 Due to Swift startracker loss-of-lock
  5. Detection of flare star Algol in Swift-BAT slew data
  6. GRB 081012: GROND upper limits
  7. Swift-BAT triggered on the flare star Algol
  8. GRB 081012: Fermi GBM detection
  9. GRB 081007 and GRB 081007B: Fermi GBM detection
  10. GRB 081012: Observations from NOT
  11. GRB 081012: Swift/UVOT analysis of initial observations
  12. GRB 081012: Swift/XRT detection
  13. GRB 081012, Swift-BAT refined analysis
  14. GRB 081012: ROTSE-III Optical Limits
  15. GRB 081012: Swift detection of a burst
  16. Revised table for GRB 081011 UVOT detections
  17. GRB081011: UVOT detection of an optical afterglow
  18. GRB 081011: Swift/XRT detection
  19. GRB 081011, Swift-BAT refined analysis
  20. GRB 081011: Swift detection of a burst
  21. GRB 081008, Swift-BAT refined analysis
  22. GRB 081008: Swift-XRT Refined Analysis
  23. GRB081008: Swift/UVOT observations
  24. GRB 081008: Enhanced Swift-XRT position
  25. GRB 081008: Swift detection of a burst with optical afterglow
  26. GRB 081008: ROTSE-III Detection of Optical Counterpart
  27. GRB081007: Swift/UVOT Observations
  28. GRB 081007, Swift-BAT refined analysis
  29. GRB 081007: Early RAPTOR measurements of optical counterpart
  30. GRB 081007: Swift-XRT Team refined analysis
  31. GRB 081007: Enhanced Swift-XRT position
  32. GRB 081007, Faulkes Telescope North optical observations
  33. GRB 081007: Swift detection of a burst with optical afterglow
  34. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  35. GRB 081003B: Swift-XRT upper limit
  36. GRB 081003A: OSN optical observations
  37. GRB 081001: Further observations from OSN
  38. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  39. GRB 081003A: Swift-XRT Team position and analysis
  40. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  41. GRB 080928: Fermi GBM detection
  42. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  43. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  44. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  45. Trigger 330353: Swift detection of a Galactic short soft burst
  46. GRB 081001: Observations from OSN
  47. GRB 081001: Swift UVOT Observations
  48. GRB 081001: Swift-XRT position
  49. GRB 080928: Watcher observations
  50. GRB 080928: VLT redshift
  51. GRB 080928: Swift-XRT refined analysis
  52. GRB 080928: Swift/UVOT observations
  53. GRB 080928, Swift-BAT final refined analysis
  54. GRB 080928: Enhanced Swift-XRT position
  55. GRB 080928, Swift-BAT initial refined analysis
  56. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  57. GRB 080928: Swift detection of a burst with an optical counterpart
  58. Swift-BAT trigger 325707 is not a GRB
  59. Swift trigger 325707: Swift/UVOT Upper Limits
  60. Swift trigger 325707: Swift-XRT upper limit
  61. Swift detection of a possible GRB (trigger 325707)
  62. GRB080916A: Suzaku WAM observation of the prompt emission
  63. GRB 080922: Swift/UVOT Upper Limits
  64. GRB080922: Swift-XRT upper limit
  65. Trigger 324561: IGR J08408-4503 detected by Swift
  66. GRB 080919: Swift/UVOT Refined Analysis
  67. GRB 080919: Swift-XRT refined analysis
  68. GRB 080919, Swift-BAT refined analysis
  69. GRB 080919: REM NIR observations
  70. GRB 080919: Swift detection of a short burst
  71. GRB 080915A: GROND upper limits
  72. GRB080913: Swift-BAT spectral lag
  73. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  74. GRB 080916A: Fermi GBM detection
  75. GRB 080916C: Swift UVOT Refined Analysis
  76. GRB 080916C: Swift XRT refined analysis
  77. GRB 080916B: Swift-XRT refined analysis
  78. Konus-Wind observation of GRB 080916A
  79. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  80. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  81. GRB 080916C: Enhanced XRT position
  82. GRB 080916C: Swift/XRT detection of possible afterglow
  83. GRB 080916B: Swift UVOT Refined Analysis
  84. GRB 080916B, Swift-BAT refined analysis
  85. GRB080916A: Refined Swift/UVOT Observations
  86. GRB 080916B: Enhanced Swift-XRT position
  87. GRB 080916A: Swift XRT refined analysis
  88. GRB 080916A, Swift-BAT refined analysis
  89. GRB 080916B: Swift-XRT afterglow detection
  90. GRB 080916A: Enhanced Swift-XRT position
  91. GRB 080916B: Swift detection of a burst
  92. GRB 080916: Swift detection of a burst with optical afterglow
  93. GRB 080915B, Swift-BAT refined analysis
  94. GRB 080915B: Swift detection of a burst
  95. GRB 080915: REM NIR early observations
  96. GRB 080915: Swift/UVOT Upper Limits
  97. GRB 080915: Swift-XRT afterglow detection and analysis
  98. GRB 080915, Swift-BAT refined analysis
  99. GRB 080915: ROTSE-III Optical Limits
  100. GRB 080915: Swift detection of a burst

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