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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"

36194 results found.

  1. GRB 081007 and GRB 081007B: Fermi GBM detection
  2. GRB 080430: optical observations
  3. GRB 081008 optical upper limit
  4. GRB 081012: Observations from NOT
  5. GRB 081012: Swift/UVOT analysis of initial observations
  6. GRB 081012: Swift/XRT detection
  7. GRB 081012, Swift-BAT refined analysis
  8. GRB 081012: ROTSE-III Optical Limits
  9. GRB 081012: Swift detection of a burst
  10. Revised table for GRB 081011 UVOT detections
  11. GRB081011: UVOT detection of an optical afterglow
  12. GRB 081011: Swift/XRT detection
  13. GRB 081011, Swift-BAT refined analysis
  14. GRB 081008, SMARTS optical/IR afterglow observations
  15. GRB 081011: Swift detection of a burst
  16. GRB 081007: Radio Detection
  17. Konus-Wind observation of GRB 081001
  18. GRB 081007: Rapid PROMPT Detections
  19. GRB 081008, Swift-BAT refined analysis
  20. GRB 081008: VLT redshift confirmation
  21. GRB 081008: Swift-XRT Refined Analysis
  22. GRB081008: Swift/UVOT observations
  23. GRB 081008: Enhanced Swift-XRT position
  24. GRB 081008: Gemini-South Absorption Redshiftt
  25. GRB 081008: VLT/FORS2 spectroscopy
  26. GRB 081008: Swift detection of a burst with optical afterglow
  27. GRB 081008: ROTSE-III Detection of Optical Counterpart
  28. GRB081006B: Fermi GBM detection
  29. GRB081006: Fermi GBM detection
  30. GRB081007: Swift/UVOT Observations
  31. GRB 081007, SMARTS optical afterglow observations
  32. GRB 081007, Swift-BAT refined analysis
  33. GRB 081007: Early RAPTOR measurements of optical counterpart
  34. GRB 081007: Swift-XRT Team refined analysis
  35. GRB 081007: Gemini-south redshift
  36. GRB 081007: Enhanced Swift-XRT position
  37. GRB 081007, Faulkes Telescope North optical observations
  38. GRB 081007, SMARTS optical/IR afterglow observations
  39. GRB 081007: REM NIR and optical counterpart
  40. GRB 081007: Swift detection of a burst with optical afterglow
  41. GRB081003C: GLAST Burst Monitor detection
  42. GRB 081003B: TAROT Calern observatory optical observations
  43. GRB 081003B: Swift-XRT upper limit
  44. GRB 081003A: OSN optical observations
  45. GRB 081001: Further observations from OSN
  46. GRB081003B: Optical limits from Spain
  47. GRB 081003A: Swift-XRT Team position and analysis
  48. GRB 081003B: a long GRB detected with INTEGRAL
  49. GRB 080928: Fermi GBM detection
  50. GRB 081003: A long GRB discovered by INTEGRAL
  51. GRB 081001: Observations from OSN
  52. GRB 080925: Suzaku WAM observation of the prompt emission
  53. GRB 081001: Swift UVOT Observations
  54. GRB 081001: Swift-XRT position
  55. GRB081001: optical limit from ASH-Centurion
  56. GRB081001: SuperAGILE Localization of a long GRB
  57. GRB080928: redshift retraction
  58. GRB 080928: Watcher observations
  59. GRB 080927: Fermi GBM detection
  60. GRB 080928: VLT redshift
  61. GRB080928: Gemini-South Absorption Redshift
  62. GRB 080928: Swift-XRT refined analysis
  63. GRB 080928: Swift/UVOT observations
  64. GRB 080928, Swift-BAT final refined analysis
  65. GRB 080928: GROND DETECTION
  66. GRB 080928: Enhanced Swift-XRT position
  67. GRB 080928, Swift-BAT initial refined analysis
  68. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  69. GRB 080928: Swift detection of a burst with an optical counterpart
  70. GRB 080925: Fermi GBM Detection
  71. GRB 080920: Fermi GBM detection
  72. Swift-BAT trigger 325707 is not a GRB
  73. Swift trigger 325707: Swift/UVOT Upper Limits
  74. Swift detection of a possible GRB (trigger 325707)
  75. GRB080916A: Suzaku WAM observation of the prompt emission
  76. GRB 080922: Swift/UVOT Upper Limits
  77. GRB080922: Swift-XRT upper limit
  78. GRB080922: A long GRB detected by INTEGRAL
  79. GRB 080913B: Fermi GBM detection
  80. GRB 080916C: Fermi GBM Spectral Analysis
  81. GRB 080919: Swift/UVOT Refined Analysis
  82. GRB 080919: Swift-XRT refined analysis
  83. GRB 080919, Swift-BAT refined analysis
  84. GRB 080916C: IRSF/SIRUS NIR Observation
  85. GRB 080916C: GROND Confirmation of the Optical Afterglow
  86. GRB 080916C: GROND Confirmation of the Optical Afterglow
  87. GRB 080919: REM NIR observations
  88. GRB 080919: Swift detection of a short burst
  89. GRB 080915A: GROND upper limits
  90. GRB 080916A: GROND lightcurve
  91. GRB 080916A: Rapid PROMPT Observations
  92. GRB 080916A: Fermi GBM detection
  93. GRB 080916C: Swift UVOT Refined Analysis
  94. GRB 080916C: Swift XRT refined analysis
  95. GRB 080916B: Swift-XRT refined analysis
  96. Konus-Wind observation of GRB 080916A
  97. Konus-Wind observation of GRB 080916C
  98. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  99. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  100. GRB 080916C: Enhanced XRT position

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