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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"

27391 results found.

  1. GRB 080916A: Fermi GBM detection
  2. GRB 080916C: Swift UVOT Refined Analysis
  3. GRB 080916C: Swift XRT refined analysis
  4. GRB 080916B: Swift-XRT refined analysis
  5. Konus-Wind observation of GRB 080916A
  6. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  7. GRB 080913: Konus-Wind and Swift/BAT joint spectral analysis
  8. GRB 080916C: Enhanced XRT position
  9. GRB080916A: Spectroscopic redshift
  10. GRB 080916C: Swift/XRT detection of possible afterglow
  11. GRB 080916B: Swift UVOT Refined Analysis
  12. GRB 080916B, Swift-BAT refined analysis
  13. GRB080916A: Refined Swift/UVOT Observations
  14. GRB 080915a, SMARTS optical/IR observations
  15. GRB 080916B: Enhanced Swift-XRT position
  16. GRB 080916C: Fermi LAT observation
  17. GRB 080916C: Fermi GBM Detection
  18. GRB 080916A: Swift XRT refined analysis
  19. GRB 080916A, Swift-BAT refined analysis
  20. GRB 080916B: Swift-XRT afterglow detection
  21. GRB 080916A: Enhanced Swift-XRT position
  22. GRB 080916: REM detection of the NIR afterglow
  23. GRB 080916: REM candidate afterglow
  24. GRB 080916: Swift detection of a burst with optical afterglow
  25. GRB 080915B, Swift-BAT refined analysis
  26. GRB 080912 : Fermi GBM detection
  27. GRB 080915: REM NIR early observations
  28. GRB 080915: Swift/UVOT Upper Limits
  29. GRB 080915: Swift-XRT afterglow detection and analysis
  30. GRB 080915, Swift-BAT refined analysis
  31. GRB 080915: ROTSE-III Optical Limits
  32. GRB 080913: Swift-XRT refined analysis
  33. GRB080913: Swift/UVOT Upper Limits
  34. GRB 080913, Swift-BAT refined analysis
  35. GRB 080913: VLT/FORS2 observations
  36. GRB 080913: REM NIR early observations
  37. GRB 080913: Enhanced Swift-XRT position
  38. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  39. GRB 080913: Swift detection of a burst
  40. GRB 080906: Watcher observations
  41. Swift-BAT/-XRT refined analysis on trigger 324362 (LS I +61 303)
  42. GRB 080906B: Fermi GBM detection
  43. GRB 080905C: Fermi GBM detection
  44. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  45. Swift trigger 324362 (LS I +61 303 ?)
  46. GRB080905A: Swift/UVOT Upper Limits
  47. GRB 080905B: Watcher optical detection
  48. GRB 080904: Fermi Gamma-ray Burst Monitor detection
  49. GRB 080905B: Fermi Gamma-ray Burst Monitor detection
  50. GRB 080905A: Fermi Gamma-ray Burst Monitor detection
  51. GRB 080905A: MITSuME Akeno optical upper limits
  52. GRB 080906: Refined Swift/UVOT Observations
  53. GRB 080906: Swift-XRT Refined Analysis
  54. GRB 080906, Swift-BAT refined analysis
  55. GRB 080905A: optical afterglow
  56. GRB 080906: GROND observations of the optical/NIR afterglow
  57. GRB 080905B: Refined UVOT Analysis
  58. GRB 080905B: VLT redshift
  59. GRB 080905A: NOT and VLT observations
  60. GRB 080905B: Enhanced Swift-XRT position
  61. GRB 080905B, Swift-BAT refined analysis
  62. GRB 080905A, Swift-BAT refined analysis
  63. GRB 080906: Swift detection of a burst with optical afterglow
  64. GRB 080905A: Swift-XRT Refined Analysis
  65. GRB080825C: Fermi-LAT observations
  66. GRB 080905B: Swift detection of a burst with possible optical counterpart
  67. GRB 080905: Swift detection of a probably-short burst
  68. GRB 080903: Swift/UVOT Observations
  69. GRB 080903: Swift-XRT Refined Analysis
  70. GRB 080903: Enhanced Swift-XRT position
  71. GRB 080903, Swift-BAT refined analysis
  72. GRB 080903: optical observations
  73. GRB 080903: Liverpool Telescope observations
  74. GRB 080903: Optical afterglow candidate
  75. GRB 080903: TAROT Calern observatory optical observations
  76. GRB 080903: Swift detection of a burst
  77. GRB 080830: Fermi Gamma-ray Burst Monitor detection
  78. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  79. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  80. nIR observations of SGR 0501+4516
  81. SGR 0501+4516: Confirmation of the NIR counterpart
  82. GRB080828: Swift/UVOT Upper Limits
  83. SGR 0501+4516: Detection of possible optical counterpart
  84. GRB080825B: Swift/UVOT Upper Limits
  85. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  86. VLA non-detection of SGR 0501+4516
  87. Swift trigger 322590: BAT detection of a possible burst
  88. GRB 080828: SuperAGILE GRB Localization
  89. Enhanced Swift-XRT position of SGR 0501+4516
  90. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  91. GRB080823: Fermi Gamma-ray Burst Monitor detection
  92. GRB 080824: Fermi Gamma Ray Burst Monitor detection
  93. Konus-Wind observation of GRB 080825B
  94. GRB080825C: GLAST Burst Monitor detection
  95. GRB 080825B: Swift-XRT team analysis
  96. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  97. Suzaku ToO Observation of SGR 0501+4516
  98. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  99. GRB 080825B: GRB Localization by SuperAGILE
  100. Radio Detection of SGR 0501+4516

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