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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"

3344 results found.

  1. GRB 081025: Swift-XRT further analysis
  2. GRB 081024B: Swift-XRT late-time observations
  3. GRB 081109A: Swift-XRT refined analysis
  4. GRB 081028 - PAIRITEL NIR detection
  5. GRB 081104: refined XRT analysis
  6. GRB 081102: Swift-XRT refined analysis
  7. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  8. GRB 081024B: new Swift-XRT observations
  9. GRB081029: Swift XRT refined analysis
  10. GRB 081028: Swift-XRT refined analysis
  11. GRB 081024B: Swift-XRT further observations
  12. Swift UVOT observations of GRB081024B
  13. GRB 081025: Swift-XRT position
  14. GRB 081024B: Swift-XRT observations
  15. GRB 081016A: Swift-XRT refined analysis
  16. GRB 081011: Swift XRT refined analysis
  17. GRB 081016B: Swift-XRT Team refined Analysis
  18. GRB 081016: Swift-XRT candidate afterglow detection
  19. GRB 081008: Swift-XRT Refined Analysis
  20. GRB 081007: Swift-XRT Team refined analysis
  21. GRB 081003B: Swift-XRT upper limit
  22. GRB 081003A: Swift-XRT Team position and analysis
  23. GRB 081001: Swift UVOT Observations
  24. GRB 081001: Swift-XRT position
  25. GRB080928: Gemini-South Absorption Redshift
  26. GRB 080928: Swift-XRT refined analysis
  27. Swift trigger 325707: Swift-XRT upper limit
  28. GRB 080919: Swift/UVOT Refined Analysis
  29. GRB 080919: Swift-XRT refined analysis
  30. GRB 080916C: IRSF/SIRUS NIR Observation
  31. GRB 080916C: Swift XRT refined analysis
  32. GRB 080916B: Swift-XRT refined analysis
  33. GRB 080916A: Swift XRT refined analysis
  34. GRB 080915: Swift-XRT afterglow detection and analysis
  35. GRB 080913: Swift-XRT refined analysis
  36. GRB 080906: Swift-XRT Refined Analysis
  37. GRB 080905A: Swift-XRT Refined Analysis
  38. GRB 080903: Swift-XRT Refined Analysis
  39. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  40. SGR 0501+4516: Detection of possible optical counterpart
  41. SGR 0501+4516: WHT observations of the possible near-infrared counterpart
  42. GRB080825B: Swift/UVOT Upper Limits
  43. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  44. SGR 0501+4516: Proximity to supernova remnant HB9
  45. Enhanced Swift-XRT position of SGR 0501+4516
  46. SGR 0501+4516: Swift XRT measure of the spin period
  47. GRB 080825B: Swift-XRT team analysis
  48. GRB 080810: Swift-XRT Team refined analysis
  49. GRB 080810: KANATA optical-NIR observation, update
  50. GRB 080723B: XMM-Newton observation
  51. GRB 080805: Swift-XRT Refined Analysis
  52. GRB 080804: Swift-XRT Refined Analysis
  53. GRB080804: Gemini South redshift confirmation
  54. GRB 080727C: Swift XRT refined analysis
  55. GRB 080727B: Swift-XRT refined analysis
  56. GRB 080727A: Swift-XRT refined analysis
  57. GRB080723B: Swift/UVOT Upper Limits
  58. GRB 080723B - Swift-XRT refined analysis
  59. GRB 080723B - Swift-XRT position
  60. GRB 080723A: Swift-XRT refined analysis
  61. GRB 080721: Swift-XRT refined analysis
  62. GRB 080702B: Swift XRT confirmation of the afterglow
  63. GRB 080710: Swift-XRT refined analysis
  64. GRB 080707: possible break in the X-rays
  65. GRB 080707: Swift XRT refined analysis
  66. Refined analysis of Swift Trigger 316063, is IGR J08408-4503
  67. GRB 080703: Swift-XRT refined analysis
  68. GRB 080702B: Swift XRT and UVOT observations
  69. GRB 080702A: Swift-XRT Team refined analysis
  70. GRB 080625:Swift-XRT detection of the afterglow
  71. Swift trigger 314975 is not a GRB
  72. GRB 080613A: Swift-XRT detection of the afterglow
  73. GRB 080613B - NOT optical and IR nondetections
  74. Swift observations of BAT Slew Survey event (Trigger=010)
  75. GRB 080603A: final Swift-XRT observations.
  76. GRB 080607: Swift-XRT refined analysis
  77. GRB 080607 - PAIRITEL NIR detection
  78. GRB 080605: Swift-XRT refined analysis
  79. GRB 080603B: PAIRITEL infrared detection
  80. GRB 080603A: PAIRITEL infrared detection
  81. GRB 080603A: Swift-XRT detection of the afterglow
  82. SGR 1627-41: Chandra/RXTE/Swift Observations Scheduled
  83. GRB 080602: Swift-XRT refined analysis
  84. Swift analysis of BAT Slew Survey event (Trigger=009)
  85. Reactivation of SGR 1627-41
  86. GRB 080524: Swift XRT and UVOT analysis
  87. GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
  88. GRB 080517: Swift-XRT refined analysis
  89. GRB 080516: Swift-XRT Team refined analysis
  90. GRB 080514B: Swift-XRT analysis
  91. GRB 080507: Swift XRT analysis confirms the X-ray afterglow
  92. GRB 080503: Chandra Observation of X-ray Rebrightening or Flattening
  93. GRB 080507: Swift-XRT position of a possible afterglow
  94. GRB 080506: Swift XRT refined analysis
  95. GRB 080506: Optical observation with KANATA/TRISPEC
  96. GRB080503 XRT refined analysis
  97. GRB 080411: Continued Swift Monitoring
  98. GRB 080430: Swift-XRT refined analysis
  99. GRB 080426: Swift-XRT refined analysis
  100. Possible GRB 080315: XRT non-detection of afterglow

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