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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"

27576 results found.

  1. GRB 081007: Early RAPTOR measurements of optical counterpart
  2. GRB 081007: Swift-XRT Team refined analysis
  3. GRB 081007: Swift detection of a burst with optical afterglow
  4. GRB081003C: GLAST Burst Monitor detection
  5. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  6. GRB 081003B: TAROT Calern observatory optical observations
  7. AXP 1E 1547.0-5408: Swift/UVOT Upper Limits
  8. GRB 081003B: Swift-XRT upper limit
  9. GRB 081003A: OSN optical observations
  10. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  11. GRB 081003A: Swift-XRT Team position and analysis
  12. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  13. GRB 080928: Fermi GBM detection
  14. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  15. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  16. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  17. Trigger 330353: Swift detection of a Galactic short soft burst
  18. GRB 081001: Swift-XRT position
  19. GRB081001: optical limit from ASH-Centurion
  20. GRB 080928: Watcher observations
  21. GRB 080927: Fermi GBM detection
  22. GRB 080928: VLT redshift
  23. GRB 080928: Swift-XRT refined analysis
  24. GRB 080928: Swift/UVOT observations
  25. GRB 080928, Swift-BAT final refined analysis
  26. GRB 080928: GROND DETECTION
  27. GRB 080928, Swift-BAT initial refined analysis
  28. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  29. GRB 080928: Swift detection of a burst with an optical counterpart
  30. GRB 080925: Fermi GBM Detection
  31. GRB 080920: Fermi GBM detection
  32. GRB080922, optical upper limit
  33. Swift-BAT trigger 325707 is not a GRB
  34. Swift trigger 325707: Swift/UVOT Upper Limits
  35. Swift trigger 325707: Swift-XRT upper limit
  36. Swift detection of a possible GRB (trigger 325707)
  37. GRB080916A: Suzaku WAM observation of the prompt emission
  38. GRB080922: Swift-XRT upper limit
  39. GRB 080913B: Fermi GBM detection
  40. Trigger 324561: IGR J08408-4503 detected by Swift
  41. GRB 080919: Swift/UVOT Refined Analysis
  42. GRB 080919: Swift-XRT refined analysis
  43. GRB 080919, Swift-BAT refined analysis
  44. GRB 080916C: GROND Confirmation of the Optical Afterglow
  45. GRB 080916C: GROND Confirmation of the Optical Afterglow
  46. GRB 080919: Swift detection of a short burst
  47. GRB 080915A: GROND upper limits
  48. GRB080913: Swift-BAT spectral lag
  49. GRB 080916A: GROND lightcurve
  50. GRB 080916A: Rapid PROMPT Observations
  51. GRB 080916A: Fermi GBM detection
  52. GRB 080916C: Swift XRT refined analysis
  53. GRB 080916B: Swift-XRT refined analysis
  54. Konus-Wind observation of GRB 080916A
  55. Konus-Wind observation of GRB 080916C
  56. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  57. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  58. GRB 080916B: Swift UVOT Refined Analysis
  59. GRB 080916B, Swift-BAT refined analysis
  60. GRB080916A: Refined Swift/UVOT Observations
  61. GRB 080916C: Fermi LAT observation
  62. GRB 080916C: Fermi GBM Detection
  63. GRB 080916A, Swift-BAT refined analysis
  64. GRB 080916B: Swift-XRT afterglow detection
  65. GRB 080916B: Swift detection of a burst
  66. GRB 080916: Swift detection of a burst with optical afterglow
  67. GRB 080915B, Swift-BAT refined analysis
  68. GRB 080912 : Fermi GBM detection
  69. GRB 080915B: Swift detection of a burst
  70. GRB 080915: Swift/UVOT Upper Limits
  71. GRB 080915: Swift-XRT afterglow detection and analysis
  72. GRB 080915, Swift-BAT refined analysis
  73. GRB 080915: ROTSE-III Optical Limits
  74. GRB 080915: Swift detection of a burst
  75. GRB 080913: Swift-XRT refined analysis
  76. GRB080913: Swift/UVOT Upper Limits
  77. GRB 080913, Swift-BAT refined analysis
  78. GRB 080913: VLT/FORS2 observations
  79. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  80. GRB 080913: Swift detection of a burst
  81. GRB 080906: Watcher observations
  82. Swift-BAT/-XRT refined analysis on trigger 324362 (LS I +61 303)
  83. GRB 080906B: Fermi GBM detection
  84. GRB 080905C: Fermi GBM detection
  85. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  86. Swift trigger 324362 (LS I +61 303 ?): XRT
  87. Swift trigger 324362 (LS I +61 303 ?)
  88. GRB080905A: Swift/UVOT Upper Limits
  89. GRB 080905B: Watcher optical detection
  90. GRB 080904: Fermi Gamma-ray Burst Monitor detection
  91. GRB 080905B: Fermi Gamma-ray Burst Monitor detection
  92. GRB 080905A: Fermi Gamma-ray Burst Monitor detection
  93. GRB 080905A: MITSuME Akeno optical upper limits
  94. Swift Trigger 324122 is again known source Swift J1842.5-1124
  95. Swift Trigger 324116 is known source again
  96. Swift Trigger 324112 is known source Swift J1842.5-1124
  97. GRB 080906: Refined Swift/UVOT Observations
  98. GRB 080906: Swift-XRT Refined Analysis
  99. GRB 080906, Swift-BAT refined analysis
  100. GRB 080906: GROND observations of the optical/NIR afterglow

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