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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"

27414 results found.

  1. GRB 080928: Swift detection of a burst with an optical counterpart
  2. GRB 080925: Fermi GBM Detection
  3. GRB 080920: Fermi GBM detection
  4. GRB080922, optical upper limit
  5. Swift trigger 325707: Swift/UVOT Upper Limits
  6. Swift trigger 325707: Swift-XRT upper limit
  7. Swift detection of a possible GRB (trigger 325707)
  8. GRB080916A: Suzaku WAM observation of the prompt emission
  9. GRB 080922: Swift/UVOT Upper Limits
  10. GRB080922: Swift-XRT upper limit
  11. GRB080922: A long GRB detected by INTEGRAL
  12. GRB 080913B: Fermi GBM detection
  13. Trigger 324561: IGR J08408-4503 detected by Swift
  14. GRB 080919: Swift-XRT refined analysis
  15. GRB 080919, Swift-BAT refined analysis
  16. GRB 080916C: IRSF/SIRUS NIR Observation
  17. GRB 080916C: GROND Confirmation of the Optical Afterglow
  18. GRB 080916C: GROND Confirmation of the Optical Afterglow
  19. GRB 080919: REM NIR observations
  20. GRB 080919: Swift detection of a short burst
  21. GRB 080915A: GROND upper limits
  22. GRB 080916A: GROND lightcurve
  23. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  24. GRB 080916A: Fermi GBM detection
  25. GRB 080916C: Swift UVOT Refined Analysis
  26. GRB 080916C: Swift XRT refined analysis
  27. GRB 080916B: Swift-XRT refined analysis
  28. Konus-Wind observation of GRB 080916A
  29. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  30. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  31. GRB 080916C: Enhanced XRT position
  32. GRB080916A: Spectroscopic redshift
  33. GRB 080916C: Swift/XRT detection of possible afterglow
  34. GRB 080916B: Swift UVOT Refined Analysis
  35. GRB 080916B, Swift-BAT refined analysis
  36. GRB080916A: Refined Swift/UVOT Observations
  37. GRB 080915a, SMARTS optical/IR observations
  38. GRB 080916B: Enhanced Swift-XRT position
  39. GRB 080916C: Fermi LAT observation
  40. GRB 080916C: Fermi GBM Detection
  41. GRB 080916A: Swift XRT refined analysis
  42. GRB 080916A, Swift-BAT refined analysis
  43. GRB 080916B: Swift-XRT afterglow detection
  44. GRB 080916A: Enhanced Swift-XRT position
  45. GRB 080916: REM detection of the NIR afterglow
  46. GRB 080916: REM candidate afterglow
  47. GRB 080916: Swift detection of a burst with optical afterglow
  48. GRB 080915B, Swift-BAT refined analysis
  49. GRB 080912 : Fermi GBM detection
  50. GRB 080915: REM NIR early observations
  51. GRB 080915: Swift/UVOT Upper Limits
  52. GRB 080915: Swift-XRT afterglow detection and analysis
  53. GRB 080915, Swift-BAT refined analysis
  54. GRB 080915: ROTSE-III Optical Limits
  55. GRB 080913: Swift-XRT refined analysis
  56. GRB080913: Swift/UVOT Upper Limits
  57. GRB 080913, Swift-BAT refined analysis
  58. GRB 080913: VLT/FORS2 observations
  59. GRB 080913: REM NIR early observations
  60. GRB 080913: Enhanced Swift-XRT position
  61. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  62. GRB 080913: Swift detection of a burst
  63. GRB 080906: Watcher observations
  64. Swift-BAT/-XRT refined analysis on trigger 324362 (LS I +61 303)
  65. GRB 080906B: Fermi GBM detection
  66. GRB 080905C: Fermi GBM detection
  67. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  68. Swift trigger 324362 (LS I +61 303 ?)
  69. GRB080905A: Swift/UVOT Upper Limits
  70. GRB 080905B: Watcher optical detection
  71. GRB 080904: Fermi Gamma-ray Burst Monitor detection
  72. GRB 080905B: Fermi Gamma-ray Burst Monitor detection
  73. GRB 080905A: Fermi Gamma-ray Burst Monitor detection
  74. GRB 080905A: MITSuME Akeno optical upper limits
  75. GRB 080906: Refined Swift/UVOT Observations
  76. GRB 080906: Swift-XRT Refined Analysis
  77. GRB 080906, Swift-BAT refined analysis
  78. GRB 080905A: optical afterglow
  79. GRB 080906: GROND observations of the optical/NIR afterglow
  80. GRB 080905B: Refined UVOT Analysis
  81. GRB 080905B: VLT redshift
  82. GRB 080905A: NOT and VLT observations
  83. GRB 080905B: Enhanced Swift-XRT position
  84. GRB 080905B, Swift-BAT refined analysis
  85. GRB 080905A, Swift-BAT refined analysis
  86. GRB 080906: Swift detection of a burst with optical afterglow
  87. GRB 080905A: Swift-XRT Refined Analysis
  88. GRB080825C: Fermi-LAT observations
  89. GRB 080905B: Swift detection of a burst with possible optical counterpart
  90. GRB 080905: Swift detection of a probably-short burst
  91. GRB 080903: Swift/UVOT Observations
  92. GRB 080903: Swift-XRT Refined Analysis
  93. GRB 080903: Enhanced Swift-XRT position
  94. GRB 080903, Swift-BAT refined analysis
  95. GRB 080903: optical observations
  96. GRB 080903: Liverpool Telescope observations
  97. GRB 080903: Optical afterglow candidate
  98. GRB 080903: TAROT Calern observatory optical observations
  99. GRB 080903: Swift detection of a burst
  100. GRB 080830: Fermi Gamma-ray Burst Monitor detection

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