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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

28054 results found.

  1. GRB 081008: Swift detection of a burst with optical afterglow
  2. GRB 081008: ROTSE-III Detection of Optical Counterpart
  3. GRB081006B: Fermi GBM detection
  4. GRB081006: Fermi GBM detection
  5. GRB081007: Swift/UVOT Observations
  6. GRB 081007, SMARTS optical afterglow observations
  7. GRB 081007, Swift-BAT refined analysis
  8. GRB 081007: Early RAPTOR measurements of optical counterpart
  9. GRB 081007: Swift-XRT Team refined analysis
  10. GRB 081007: Enhanced Swift-XRT position
  11. GRB 081007, Faulkes Telescope North optical observations
  12. GRB 081007: REM NIR and optical counterpart
  13. GRB 081007: Swift detection of a burst with optical afterglow
  14. GRB081003C: GLAST Burst Monitor detection
  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. GRB 081001: Further observations from OSN
  20. AXP 1E1547.0-5408: Swift-XRT Team refined analysis
  21. GRB 081003A: Swift-XRT Team position and analysis
  22. GRB 081003B: a long GRB detected with INTEGRAL
  23. GRB 080928: Fermi GBM detection
  24. GRB 081003: A long GRB discovered by INTEGRAL
  25. SGR 1550-5418 = AXP 1E1547.0-5408 (Trigger 330353)
  26. Trigger 330353: Swift detection of a Galactic short soft burst
  27. GRB 081001: Observations from OSN
  28. GRB 080925: Suzaku WAM observation of the prompt emission
  29. GRB 081001: Swift UVOT Observations
  30. GRB 081001: Swift-XRT position
  31. GRB081001: SuperAGILE Localization of a long GRB
  32. GRB 080928: Watcher observations
  33. GRB 080927: Fermi GBM detection
  34. GRB 080928: VLT redshift
  35. GRB 080928: Swift-XRT refined analysis
  36. GRB 080928, Swift-BAT final refined analysis
  37. GRB 080928: GROND DETECTION
  38. GRB 080928: Enhanced Swift-XRT position
  39. GRB 080928, Swift-BAT initial refined analysis
  40. GRB 080928A: ROTSE-III Confirmation of Optical Counterpart
  41. GRB 080928: Swift detection of a burst with an optical counterpart
  42. GRB 080925: Fermi GBM Detection
  43. GRB 080920: Fermi GBM detection
  44. GRB080922, optical upper limit
  45. Swift trigger 325707: Swift/UVOT Upper Limits
  46. Swift trigger 325707: Swift-XRT upper limit
  47. Swift detection of a possible GRB (trigger 325707)
  48. GRB080916A: Suzaku WAM observation of the prompt emission
  49. GRB 080922: Swift/UVOT Upper Limits
  50. GRB080922: Swift-XRT upper limit
  51. GRB080922: A long GRB detected by INTEGRAL
  52. GRB 080913B: Fermi GBM detection
  53. Trigger 324561: IGR J08408-4503 detected by Swift
  54. GRB 080919: Swift-XRT refined analysis
  55. GRB 080919, Swift-BAT refined analysis
  56. GRB 080916C: IRSF/SIRUS NIR Observation
  57. GRB 080916C: GROND Confirmation of the Optical Afterglow
  58. GRB 080916C: GROND Confirmation of the Optical Afterglow
  59. GRB 080919: REM NIR observations
  60. GRB 080919: Swift detection of a short burst
  61. GRB 080915A: GROND upper limits
  62. GRB 080916A: GROND lightcurve
  63. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  64. GRB 080916A: Fermi GBM detection
  65. GRB 080916C: Swift UVOT Refined Analysis
  66. GRB 080916C: Swift XRT refined analysis
  67. GRB 080916B: Swift-XRT refined analysis
  68. Konus-Wind observation of GRB 080916A
  69. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  70. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  71. GRB 080916C: Enhanced XRT position
  72. GRB080916A: Spectroscopic redshift
  73. GRB 080916C: Swift/XRT detection of possible afterglow
  74. GRB 080916B: Swift UVOT Refined Analysis
  75. GRB 080916B, Swift-BAT refined analysis
  76. GRB080916A: Refined Swift/UVOT Observations
  77. GRB 080915a, SMARTS optical/IR observations
  78. GRB 080916B: Enhanced Swift-XRT position
  79. GRB 080916C: Fermi LAT observation
  80. GRB 080916C: Fermi GBM Detection
  81. GRB 080916A: Swift XRT refined analysis
  82. GRB 080916A, Swift-BAT refined analysis
  83. GRB 080916B: Swift-XRT afterglow detection
  84. GRB 080916A: Enhanced Swift-XRT position
  85. GRB 080916: REM detection of the NIR afterglow
  86. GRB 080916: REM candidate afterglow
  87. GRB 080916: Swift detection of a burst with optical afterglow
  88. GRB 080915B, Swift-BAT refined analysis
  89. GRB 080912 : Fermi GBM detection
  90. GRB 080915: REM NIR early observations
  91. GRB 080915: Swift/UVOT Upper Limits
  92. GRB 080915: Swift-XRT afterglow detection and analysis
  93. GRB 080915, Swift-BAT refined analysis
  94. GRB 080915: ROTSE-III Optical Limits
  95. GRB 080913: Swift-XRT refined analysis
  96. GRB080913: Swift/UVOT Upper Limits
  97. GRB 080913, Swift-BAT refined analysis
  98. GRB 080913: VLT/FORS2 observations
  99. GRB 080913: REM NIR early observations
  100. GRB 080913: Enhanced Swift-XRT position

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