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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"

21469 results found.

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

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