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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"

37580 results found.

  1. GRB081011: UVOT detection of an optical afterglow
  2. GRB 081011: Swift/XRT detection
  3. GRB 081011, Swift-BAT refined analysis
  4. GRB 081008, SMARTS optical/IR afterglow observations
  5. GRB 081011: Swift detection of a burst
  6. GRB 081007: Radio Detection
  7. Konus-Wind observation of GRB 081001
  8. GRB 081007: Rapid PROMPT Detections
  9. GRB 081008, Swift-BAT refined analysis
  10. GRB 081008: VLT redshift confirmation
  11. GRB 081008: Swift-XRT Refined Analysis
  12. GRB081008: Swift/UVOT observations
  13. GRB 081008: Enhanced Swift-XRT position
  14. GRB 081008: Gemini-South Absorption Redshiftt
  15. GRB 081008: VLT/FORS2 spectroscopy
  16. GRB 081008: Swift detection of a burst with optical afterglow
  17. GRB 081008: ROTSE-III Detection of Optical Counterpart
  18. GRB081006B: Fermi GBM detection
  19. GRB081006: Fermi GBM detection
  20. GRB081007: Swift/UVOT Observations
  21. GRB 081007, SMARTS optical afterglow observations
  22. GRB 081007, Swift-BAT refined analysis
  23. GRB 081007: Early RAPTOR measurements of optical counterpart
  24. GRB 081007: Swift-XRT Team refined analysis
  25. GRB 081007: Gemini-south redshift
  26. GRB 081007: Enhanced Swift-XRT position
  27. GRB 081007, Faulkes Telescope North optical observations
  28. GRB 081007, SMARTS optical/IR afterglow observations
  29. GRB 081007: REM NIR and optical counterpart
  30. GRB 081007: Swift detection of a burst with optical afterglow
  31. GRB081003C: GLAST Burst Monitor detection
  32. Fermi GBM detection of additional bursts from AXP 1E1547.0-5408
  33. GRB 081003B: TAROT Calern observatory optical observations
  34. GRB 081003B: Swift-XRT upper limit
  35. GRB 081003A: OSN optical observations
  36. GRB 081001: Further observations from OSN
  37. GRB081003B: Optical limits from Spain
  38. GRB 081003A: Swift-XRT Team position and analysis
  39. GRB 081003B: a long GRB detected with INTEGRAL
  40. GRB 080928: Fermi GBM detection
  41. AXP 1E1547.0-5408 (SGR 1550-5418): Fermi GBM detection
  42. GRB 081003: A long GRB discovered by INTEGRAL
  43. GRB 081001: Observations from OSN
  44. GRB 080925: Suzaku WAM observation of the prompt emission
  45. GRB 081001: Swift UVOT Observations
  46. GRB 081001: Swift-XRT position
  47. GRB081001: optical limit from ASH-Centurion
  48. GRB081001: SuperAGILE Localization of a long GRB
  49. GRB080928: redshift retraction
  50. GRB 080928: Watcher observations
  51. GRB 080927: Fermi GBM detection
  52. GRB 080928: VLT redshift
  53. GRB080928: Gemini-South Absorption Redshift
  54. GRB 080928: Swift-XRT refined analysis
  55. GRB 080928: Swift/UVOT observations
  56. GRB 080928, Swift-BAT final refined analysis
  57. GRB 080928: GROND DETECTION
  58. GRB 080928: Enhanced Swift-XRT position
  59. GRB 080928, Swift-BAT initial refined analysis
  60. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  61. GRB 080928: Swift detection of a burst with an optical counterpart
  62. GRB 080925: Fermi GBM Detection
  63. GRB 080920: Fermi GBM detection
  64. Swift-BAT trigger 325707 is not a GRB
  65. Swift trigger 325707: Swift/UVOT Upper Limits
  66. Swift detection of a possible GRB (trigger 325707)
  67. GRB080916A: Suzaku WAM observation of the prompt emission
  68. GRB 080922: Swift/UVOT Upper Limits
  69. GRB080922: Swift-XRT upper limit
  70. GRB080922: A long GRB detected by INTEGRAL
  71. GRB 080913B: Fermi GBM detection
  72. GRB 080916C: Fermi GBM Spectral Analysis
  73. GRB 080919: Swift/UVOT Refined Analysis
  74. GRB 080919: Swift-XRT refined analysis
  75. GRB 080919, Swift-BAT refined analysis
  76. GRB 080916C: IRSF/SIRUS NIR Observation
  77. GRB 080916C: GROND Confirmation of the Optical Afterglow
  78. GRB 080916C: GROND Confirmation of the Optical Afterglow
  79. GRB 080919: REM NIR observations
  80. GRB 080919: Swift detection of a short burst
  81. Fermi/GBM Data Now Available
  82. GRB 080915A: GROND upper limits
  83. GRB 080916A: GROND lightcurve
  84. GRB 080916A: Rapid PROMPT Observations
  85. GRB 080916A: Fermi GBM detection
  86. GRB 080916C: Swift UVOT Refined Analysis
  87. GRB 080916C: Swift XRT refined analysis
  88. GRB 080916B: Swift-XRT refined analysis
  89. Konus-Wind observation of GRB 080916A
  90. Konus-Wind observation of GRB 080916C
  91. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  92. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  93. GRB 080916C: Enhanced XRT position
  94. GRB080916A: Spectroscopic redshift
  95. GRB 080916C: Swift/XRT detection of possible afterglow
  96. GRB 080916B: Swift UVOT Refined Analysis
  97. IPN Triangulation and Energy Spectrum of GRB080916C
  98. GRB 080916B, Swift-BAT refined analysis
  99. GRB080916A: Refined Swift/UVOT Observations
  100. GRB 080915a, SMARTS optical/IR observations

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