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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"

29109 results found.

  1. GRB 081008, Swift-BAT refined analysis
  2. GRB 081008: Swift-XRT Refined Analysis
  3. GRB081008: Swift/UVOT observations
  4. GRB 081008: Swift detection of a burst with optical afterglow
  5. GRB 081008: ROTSE-III Detection of Optical Counterpart
  6. GRB081006B: Fermi GBM detection
  7. GRB081006: Fermi GBM detection
  8. GRB081007: Swift/UVOT Observations
  9. GRB 081007, Swift-BAT refined analysis
  10. GRB 081007: Early RAPTOR measurements of optical counterpart
  11. GRB 081007: Swift-XRT Team refined analysis
  12. GRB 081007: Swift detection of a burst with optical afterglow
  13. GRB081003C: GLAST Burst Monitor detection
  14. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  15. GRB 081003B: TAROT Calern observatory optical observations
  16. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  17. GRB 081003B: Swift-XRT upper limit
  18. GRB 081003A: OSN optical observations
  19. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  20. GRB 081003A: Swift-XRT Team position and analysis
  21. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  22. GRB 080928: Fermi GBM detection
  23. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  24. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  25. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  26. Trigger 330353: Swift detection of a Galactic short soft burst
  27. GRB 080925: Suzaku WAM observation of the prompt emission
  28. GRB 081001: Swift-XRT position
  29. GRB081001: optical limit from ASH-Centurion
  30. GRB 080928: Watcher observations
  31. GRB 080927: Fermi GBM detection
  32. GRB 080928: VLT redshift
  33. GRB 080928: Swift/UVOT observations
  34. GRB 080928, Swift-BAT final refined analysis
  35. GRB 080928: GROND DETECTION
  36. GRB 080928, Swift-BAT initial refined analysis
  37. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  38. GRB 080928: Swift detection of a burst with an optical counterpart
  39. GRB 080925: Fermi GBM Detection
  40. GRB 080920: Fermi GBM detection
  41. GRB080922, optical upper limit
  42. Swift-BAT trigger 325707 is not a GRB
  43. Swift trigger 325707: Swift/UVOT Upper Limits
  44. Swift trigger 325707: Swift-XRT upper limit
  45. Swift detection of a possible GRB (trigger 325707)
  46. GRB080916A: Suzaku WAM observation of the prompt emission
  47. GRB080922: Swift-XRT upper limit
  48. GRB 080913B: Fermi GBM detection
  49. Trigger 324561: IGR J08408-4503 detected by Swift
  50. GRB 080916C: Fermi GBM Spectral Analysis
  51. GRB 080919: Swift/UVOT Refined Analysis
  52. GRB 080919: Swift-XRT refined analysis
  53. GRB 080919, Swift-BAT refined analysis
  54. GRB 080916C: IRSF/SIRUS NIR Observation
  55. GRB 080916C: GROND Confirmation of the Optical Afterglow
  56. GRB 080916C: GROND Confirmation of the Optical Afterglow
  57. GRB 080919: Swift detection of a short burst
  58. Fermi/GBM Data Now Available
  59. GRB 080915A: GROND upper limits
  60. GRB 080916A: GROND lightcurve
  61. GRB 080916A: Rapid PROMPT Observations
  62. GRB 080916A: Fermi GBM detection
  63. GRB 080916C: Swift UVOT Refined Analysis
  64. GRB 080916C: Swift XRT refined analysis
  65. GRB 080916B: Swift-XRT refined analysis
  66. Konus-Wind observation of GRB 080916A
  67. Konus-Wind observation of GRB 080916C
  68. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  69. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  70. GRB 080916C: Swift/XRT detection of possible afterglow
  71. GRB 080916B: Swift UVOT Refined Analysis
  72. GRB 080916B, Swift-BAT refined analysis
  73. GRB080916A: Refined Swift/UVOT Observations
  74. GRB 080916C: Fermi LAT observation
  75. GRB 080916C: Fermi GBM Detection
  76. GRB 080916A, Swift-BAT refined analysis
  77. GRB 080916B: Swift-XRT afterglow detection
  78. GRB 080916B: Swift detection of a burst
  79. GRB 080916: Swift detection of a burst with optical afterglow
  80. GRB 080915B, Swift-BAT refined analysis
  81. GRB 080912 : Fermi GBM detection
  82. GRB 080915B: Swift detection of a burst
  83. GRB 080915: Swift/UVOT Upper Limits
  84. GRB 080915: Swift-XRT afterglow detection and analysis
  85. GRB 080915, Swift-BAT refined analysis
  86. GRB 080915: ROTSE-III Optical Limits
  87. GRB 080915: Swift detection of a burst
  88. GRB 080913: Swift-XRT refined analysis
  89. GRB080913: Swift/UVOT Upper Limits
  90. GRB 080913, Swift-BAT refined analysis
  91. GRB 080913: VLT/FORS2 observations
  92. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  93. GRB 080913: Swift detection of a burst
  94. GRB 080906: Watcher observations
  95. Swift-BAT/-XRT refined analysis on trigger 324362 (LS I +61 303)
  96. GRB 080906B: Fermi GBM detection
  97. GRB 080905C: Fermi GBM detection
  98. Swift trigger 324362 (LS I +61 303 ?): XRT
  99. Swift trigger 324362 (LS I +61 303 ?)
  100. GRB080905A: Swift/UVOT Upper Limits

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