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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"

27405 results found.

  1. GRB080922: Swift-XRT upper limit
  2. GRB080922: A long GRB detected by INTEGRAL
  3. GRB 080913B: Fermi GBM detection
  4. Trigger 324561: IGR J08408-4503 detected by Swift
  5. GRB 080919: Swift-XRT refined analysis
  6. GRB 080919, Swift-BAT refined analysis
  7. GRB 080916C: IRSF/SIRUS NIR Observation
  8. GRB 080916C: GROND Confirmation of the Optical Afterglow
  9. GRB 080916C: GROND Confirmation of the Optical Afterglow
  10. GRB 080919: REM NIR observations
  11. GRB 080919: Swift detection of a short burst
  12. GRB 080915A: GROND upper limits
  13. GRB 080916A: GROND lightcurve
  14. SGR 0501+4516: preliminary results of the Suzaku ToO observation
  15. GRB 080916A: Fermi GBM detection
  16. GRB 080916C: Swift UVOT Refined Analysis
  17. GRB 080916C: Swift XRT refined analysis
  18. GRB 080916B: Swift-XRT refined analysis
  19. Konus-Wind observation of GRB 080916A
  20. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  21. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  22. GRB 080916C: Enhanced XRT position
  23. GRB080916A: Spectroscopic redshift
  24. GRB 080916C: Swift/XRT detection of possible afterglow
  25. GRB 080916B: Swift UVOT Refined Analysis
  26. GRB 080916B, Swift-BAT refined analysis
  27. GRB080916A: Refined Swift/UVOT Observations
  28. GRB 080915a, SMARTS optical/IR observations
  29. GRB 080916B: Enhanced Swift-XRT position
  30. GRB 080916C: Fermi LAT observation
  31. GRB 080916C: Fermi GBM Detection
  32. GRB 080916A: Swift XRT refined analysis
  33. GRB 080916A, Swift-BAT refined analysis
  34. GRB 080916B: Swift-XRT afterglow detection
  35. GRB 080916A: Enhanced Swift-XRT position
  36. GRB 080916: REM detection of the NIR afterglow
  37. GRB 080916: REM candidate afterglow
  38. GRB 080916: Swift detection of a burst with optical afterglow
  39. GRB 080915B, Swift-BAT refined analysis
  40. GRB 080912 : Fermi GBM detection
  41. GRB 080915: REM NIR early observations
  42. GRB 080915: Swift/UVOT Upper Limits
  43. GRB 080915: Swift-XRT afterglow detection and analysis
  44. GRB 080915, Swift-BAT refined analysis
  45. GRB 080915: ROTSE-III Optical Limits
  46. GRB 080913: Swift-XRT refined analysis
  47. GRB080913: Swift/UVOT Upper Limits
  48. GRB 080913, Swift-BAT refined analysis
  49. GRB 080913: VLT/FORS2 observations
  50. GRB 080913: REM NIR early observations
  51. GRB 080913: Enhanced Swift-XRT position
  52. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  53. GRB 080913: Swift detection of a burst
  54. GRB 080906: Watcher observations
  55. Swift-BAT/-XRT refined analysis on trigger 324362 (LS I +61 303)
  56. GRB 080906B: Fermi GBM detection
  57. GRB 080905C: Fermi GBM detection
  58. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  59. Swift trigger 324362 (LS I +61 303 ?)
  60. GRB080905A: Swift/UVOT Upper Limits
  61. GRB 080905B: Watcher optical detection
  62. GRB 080904: Fermi Gamma-ray Burst Monitor detection
  63. GRB 080905B: Fermi Gamma-ray Burst Monitor detection
  64. GRB 080905A: Fermi Gamma-ray Burst Monitor detection
  65. GRB 080905A: MITSuME Akeno optical upper limits
  66. GRB 080906: Refined Swift/UVOT Observations
  67. GRB 080906: Swift-XRT Refined Analysis
  68. GRB 080906, Swift-BAT refined analysis
  69. GRB 080905A: optical afterglow
  70. GRB 080906: GROND observations of the optical/NIR afterglow
  71. GRB 080905B: Refined UVOT Analysis
  72. GRB 080905B: VLT redshift
  73. GRB 080905A: NOT and VLT observations
  74. GRB 080905B: Enhanced Swift-XRT position
  75. GRB 080905B, Swift-BAT refined analysis
  76. GRB 080905A, Swift-BAT refined analysis
  77. GRB 080906: Swift detection of a burst with optical afterglow
  78. GRB 080905A: Swift-XRT Refined Analysis
  79. GRB080825C: Fermi-LAT observations
  80. GRB 080905B: Swift detection of a burst with possible optical counterpart
  81. GRB 080905: Swift detection of a probably-short burst
  82. GRB 080903: Swift/UVOT Observations
  83. GRB 080903: Swift-XRT Refined Analysis
  84. GRB 080903: Enhanced Swift-XRT position
  85. GRB 080903, Swift-BAT refined analysis
  86. GRB 080903: optical observations
  87. GRB 080903: Liverpool Telescope observations
  88. GRB 080903: Optical afterglow candidate
  89. GRB 080903: TAROT Calern observatory optical observations
  90. GRB 080903: Swift detection of a burst
  91. GRB 080830: Fermi Gamma-ray Burst Monitor detection
  92. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  93. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  94. nIR observations of SGR 0501+4516
  95. SGR 0501+4516: Confirmation of the NIR counterpart
  96. GRB080828: Swift/UVOT Upper Limits
  97. SGR 0501+4516: Detection of possible optical counterpart
  98. GRB080825B: Swift/UVOT Upper Limits
  99. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  100. VLA non-detection of SGR 0501+4516

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