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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"

27396 results found.

  1. GRB 081121: Enhanced Swift-XRT position
  2. GRB 081121: GROND observations
  3. GRB 081121: Swift-BAT refined analysis
  4. GRB081121: Swift/UVOT observations
  5. GRB 081121: ROTSE-III Detection of Optical Counterpart
  6. GRB081118 : optical upper limit
  7. GRB 081119: Fermi GBM detection
  8. VLA Radio upper limit on GRB 081118
  9. GRB 081118: Swift-XRT refined analysis
  10. GRB 081118: GROND detection of afterglow
  11. GRB 081118: optical afterglow candidate
  12. GRB 081118: Swift UVOT Upper Limits
  13. GRB 081118: Swift-BAT refined analysis
  14. GRB 081118: Enhanced Swift-XRT position
  15. GRB 081118: Swift detection of a burst
  16. GRB 081109A: confirmation of possible detection host galaxy
  17. Further Swift-XRT observations of the probable GRB 081105.
  18. GRB 081113: Fermi GBM detection
  19. GRB 081102: RTT150 Optical observations
  20. GRB 081110: Fermi GBM detection
  21. GRB 081109: TAROT La Silla observatory optical observations
  22. GRB 081102: MASTER refind and final results
  23. GRB 081109: GROND redshift limit and host extinction
  24. GRB 081025: Swift-XRT further analysis
  25. GRB 081024B: Swift-XRT late-time observations
  26. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  27. GRB 081109A, Swift-BAT refined analysis
  28. GRB 081109A: Swift-XRT refined analysis
  29. GRB 081109: Fermi GBM detection
  30. Swift-BAT Trigger 334129: possible burst
  31. GRB 081109: REM NIR afterglow detection
  32. GRB 081109: Swift detection of a burst
  33. GRB 081024C: Fermi Gamma-ray Burst Monitor detection
  34. SGR 1806-20: Fermi GBM detection
  35. GRB 081102B: Fermi GBM detection
  36. GRB 081105B: Fermi GBM detection
  37. GRB 081107: Fermi GBM detection
  38. GRB 081104: GROND found no Optical/NIR Afterglow
  39. GRB 081105: GROND Upper Limits
  40. Radio observation of GRB 080523 with ATCA
  41. Radio observation of GRB 080520 with ATCA
  42. GRB 081105: Observations from OSN
  43. Swift-XRT observations of GRB 081105
  44. GRB 081101B: Fermi GBM detection
  45. Radio observation of GRB 080516 with ATCA
  46. GRB 081105 Swift/BAT and IPN Localization
  47. GRB 081025: Fermi GBM observation
  48. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  49. GRB 081104: refined XRT analysis
  50. GRB 081104: Enhanced Swift-XRT position
  51. GRB 081104: Swift-BAT refined analysis
  52. GRB 081104 : Faulkes Telescope South observations
  53. Radio observation of GRB 080130 with ATCA
  54. GRB 081102: MASTER prompt optical limit
  55. GRB 081102: Swift-XRT refined analysis
  56. GRB 081102: Swift-BAT refined analysis
  57. GRB 081102: Enhanced Swift-XRT position
  58. Radio observation of GRB 080218b with ATCA
  59. Radio observation of GRB 080229a with ATCA
  60. GRB 081102: MASTER VWF promt observation
  61. GRB 081102: Swift detection of a burst
  62. SGR 0501+4516: optical observations in August
  63. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  64. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  65. GRB 081024B: BTA deep optical observations
  66. GRB 081024B: new Swift-XRT observations
  67. Radio observation of GRB 080229b with ATCA
  68. GRB 081024B: VLA radio observation
  69. GRB 081029: UVOT Detection of the Optical Afterglow
  70. GRB 081029: Swift-BAT refined analysis
  71. GRB081029: Swift XRT refined analysis
  72. GRB 081025: Suzaku WAM observation of the prompt emission
  73. GRB 081029: Enhanced Swift-XRT position
  74. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  75. GRB 081029: REM observations
  76. Radio observation of GRB 080303 with ATCA
  77. Radio observation of GRB 080411 with ATCA
  78. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  79. GRB 081029: ROTSE-III Detection of Optical Counterpart
  80. GRB 081028B: Fermi GBM detection
  81. GRB 081021: Fermi GBM detection
  82. Swift UVOT observations of GRB081028
  83. GRB 081028: Swift-XRT refined analysis
  84. GRB 081028, Swift-BAT refined analysis
  85. GRB 081028: Enhanced Swift-XRT position
  86. GRB 081028: TAROT Calern observatory optical observations
  87. GRB 081028: optical observations at the NOT
  88. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  89. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  90. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  91. GRB 081028: Swift detection of a burst
  92. GRB 081024: No radio detection with the VLA
  93. GRB081025: RTT150 optical observations
  94. GRB081024B: P200 Observations
  95. GRB 081024B: Swift-XRT further observations
  96. GRB 081025 BAT refined analysis
  97. Swift UVOT observations of GRB081024B
  98. Konus-Wind observation of GRB 081025
  99. GRB 081025: Swift-XRT position
  100. GRB 081024B: Swift-XRT observations

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