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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"
  1. GRB 081003A: Swift-XRT Team position and analysis
  2. Swift-BAT refined analysis of AXP 1E1547.0-5408 (Trigger 330353)
  3. GRB 081003B: a long GRB detected with INTEGRAL
  4. GRB 080928: Fermi GBM detection
  5. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  6. GRB 081003: A long GRB discovered by INTEGRAL
  7. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  8. Swift discovery of a new Soft Gamma Repeater SGR 1550-5418
  9. Trigger 330353: Swift detection of a Galactic short soft burst
  10. GRB 081001: Observations from OSN
  11. GRB 080925: Suzaku WAM observation of the prompt emission
  12. GRB 081001: Swift UVOT Observations
  13. GRB 081001: Swift-XRT position
  14. GRB081001: optical limit from ASH-Centurion
  15. GRB081001: SuperAGILE Localization of a long GRB
  16. GRB080928: redshift retraction
  17. GRB 080928: Watcher observations
  18. GRB 080927: Fermi GBM detection
  19. GRB 080928: VLT redshift
  20. GRB080928: Gemini-South Absorption Redshift
  21. GRB 080928: Swift-XRT refined analysis
  22. GRB 080928: Swift/UVOT observations
  23. GRB 080928, Swift-BAT final refined analysis
  24. GRB 080928: GROND DETECTION
  25. GRB 080928: Enhanced Swift-XRT position
  26. GRB 080928, Swift-BAT initial refined analysis
  27. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  28. GRB 080928: Swift detection of a burst with an optical counterpart
  29. GRB 080925: Fermi GBM Detection
  30. GRB 080920: Fermi GBM detection
  31. GRB080922, optical upper limit
  32. Swift-BAT trigger 325707 is not a GRB
  33. Swift trigger 325707: Swift/UVOT Upper Limits
  34. Swift trigger 325707: Swift-XRT upper limit
  35. Swift detection of a possible GRB (trigger 325707)
  36. GRB080916A: Suzaku WAM observation of the prompt emission
  37. GRB 080922: Swift/UVOT Upper Limits
  38. GRB080922: Swift-XRT upper limit
  39. GRB080922: A long GRB detected by INTEGRAL
  40. GRB 080913B: Fermi GBM detection
  41. Trigger 324561: IGR J08408-4503 detected by Swift
  42. GRB 080916C: Fermi GBM Spectral Analysis
  43. GRB 080919: Swift/UVOT Refined Analysis
  44. GRB 080919: Swift-XRT refined analysis
  45. GRB 080919, Swift-BAT refined analysis
  46. GRB 080916C: IRSF/SIRUS NIR Observation
  47. GRB 080916C: GROND Confirmation of the Optical Afterglow
  48. GRB 080916C: GROND Confirmation of the Optical Afterglow
  49. GRB 080919: REM NIR observations
  50. GRB 080919: Swift detection of a short burst
  51. Fermi/GBM Data Now Available
  52. GRB 080915A: GROND upper limits
  53. GRB080913: Swift-BAT spectral lag
  54. GRB 080916A: GROND lightcurve
  55. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  56. GRB 080916A: Rapid PROMPT Observations
  57. GRB 080916A: Fermi GBM detection
  58. GRB 080916C: Swift UVOT Refined Analysis
  59. GRB 080916C: Swift XRT refined analysis
  60. GRB 080916B: Swift-XRT refined analysis
  61. Konus-Wind observation of GRB 080916A
  62. Konus-Wind observation of GRB 080916C
  63. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  64. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  65. GRB 080916C: Enhanced XRT position
  66. GRB080916A: Spectroscopic redshift
  67. GRB 080916C: Swift/XRT detection of possible afterglow
  68. GRB 080916B: Swift UVOT Refined Analysis
  69. IPN Triangulation and Energy Spectrum of GRB080916C
  70. GRB 080916B, Swift-BAT refined analysis
  71. GRB080916A: Refined Swift/UVOT Observations
  72. GRB 080915a, SMARTS optical/IR observations
  73. GRB 080916B: Enhanced Swift-XRT position
  74. GRB 080916C: Fermi LAT observation
  75. GRB 080916C: Fermi GBM Detection
  76. GRB 080916A: Swift XRT refined analysis
  77. GRB 080916A, Swift-BAT refined analysis
  78. GRB 080916B: Swift-XRT afterglow detection
  79. GRB 080916A: Enhanced Swift-XRT position
  80. GRB 080916B: Swift detection of a burst
  81. GRB 080916: REM detection of the NIR afterglow
  82. GRB 080916: REM candidate afterglow
  83. GRB 080916: Swift detection of a burst with optical afterglow
  84. GRB 080915B, Swift-BAT refined analysis
  85. GRB 080912 : Fermi GBM detection
  86. GRB 080915B: Swift detection of a burst
  87. GRB 080915: REM NIR early observations
  88. GRB 080915: Swift/UVOT Upper Limits
  89. GRB 080915: Swift-XRT afterglow detection and analysis
  90. GRB 080915, Swift-BAT refined analysis
  91. SGR 0501+4516 : P200 i-band observations
  92. GRB 080915: ROTSE-III Optical Limits
  93. GRB 080915: Swift detection of a burst
  94. GRB 080913: Swift-XRT refined analysis
  95. GRB 080913: VLT/FORS spectrum
  96. GRB080913: Swift/UVOT Upper Limits
  97. GRB 080913: GROND photo-z
  98. GRB 080913, Swift-BAT refined analysis
  99. GRB 080913: VLT/FORS2 observations
  100. GRB 080913: REM NIR early observations

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