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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

42650 results found.

  1. GRB 081025: Fermi GBM observation
  2. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  3. GRB 081104: refined XRT analysis
  4. GRB 081104: Enhanced Swift-XRT position
  5. GRB 081104: Swift-BAT refined analysis
  6. GRB081104: Swift/UVOT Upper Limits
  7. Fermi-GBM detection of a Solar Flare
  8. Fermi Detection of GRB 081102
  9. GRB 081104 : Faulkes Telescope South observations
  10. GRB 081104: Swift detection of a burst
  11. Radio observation of GRB 080130 with ATCA
  12. GRB 081102: MASTER prompt optical limit
  13. GRB 081102: Swift-XRT refined analysis
  14. GRB 081102: Swift-BAT refined analysis
  15. GRB 081102: Enhanced Swift-XRT position
  16. Radio observation of GRB 080218b with ATCA
  17. Radio observation of GRB 080229a with ATCA
  18. GRB 081102: MASTER VWF promt observation
  19. GRB 081102: OPTIMA-Burst optical upper limit
  20. GRB 081102: Swift detection of a burst
  21. SGR 0501+4516: optical observations in August
  22. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  23. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  24. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  25. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  26. GRB 081024B: BTA deep optical observations
  27. GRB 081028: CrAO optical observations
  28. GRB 081024B: new Swift-XRT observations
  29. Radio observation of GRB 080229b with ATCA
  30. GRB 081024B: VLA radio observation
  31. GRB 081029: UVOT Detection of the Optical Afterglow
  32. GRB 081029: PROMPT Detections
  33. GRB 081029: Redshift Confirmation from Gemini-South
  34. GRB 081029: Swift-BAT refined analysis
  35. GRB081029: Swift XRT refined analysis
  36. GRB 081025: Suzaku WAM observation of the prompt emission
  37. GRB 081024B: Suzaku WAM observation of the prompt emission
  38. GRB 081029: Enhanced Swift-XRT position
  39. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  40. GRB 081029: REM observations
  41. Radio observation of GRB 080303 with ATCA
  42. Radio observation of GRB 080411 with ATCA
  43. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  44. GRB 081029: ROTSE-III Detection of Optical Counterpart
  45. GRB 081029: Swift detection of a burst
  46. GRB 081028: Magellan redshift
  47. GRB 081028B: Fermi GBM detection
  48. GRB 081021: Fermi GBM detection
  49. GRB081028: UVOT detection of a brightening afterglow
  50. Swift UVOT observations of GRB081028
  51. GRB 081028: Swift-XRT refined analysis
  52. GRB 081028, Swift-BAT refined analysis
  53. GRB 081028: Enhanced Swift-XRT position
  54. GRB 081028: TAROT Calern observatory optical observations
  55. GRB 081028: optical observations at the NOT
  56. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  57. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  58. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  59. GRB 081028: Swift detection of a burst
  60. GRB 081025: TLS upper limits
  61. GRB 081024: No radio detection with the VLA
  62. GRB081024B: P200 Observations
  63. GRB 081024B: Swift-XRT further observations
  64. GRB 081025 BAT refined analysis
  65. Swift UVOT observations of GRB081025
  66. Swift UVOT observations of GRB081024B
  67. Konus-Wind observation of GRB 081025
  68. GRB 081025: Swift-XRT position
  69. GRB 081025: Burst detection from Swift-BAT slew data
  70. GRB 081024B: Fermi Gamma-ray Burst Monitor detection
  71. Fermi-LAT observation of GRB 081024B
  72. GRB 081024: Swift-XRT refined analysis
  73. GRB 081024, Swift-BAT refined analysis
  74. GRB 081024: Enhanced Swift-XRT position
  75. GRB 081024: Faulkes Telescope North optical observations
  76. GRB 081024: KAIT Optical Limits
  77. GRB 081024: Early Super-LOTIS Observations
  78. GRB 081024: Swift detection of a burst
  79. GRB 081022, Swift-BAT refined analysis
  80. GRB 081016A: Swift-XRT refined analysis
  81. GRB 081022: Swift detection of a burst
  82. GRB 081012: Swift-XRT Refined Analysis
  83. Swift trigger 332287 is not a GRB
  84. Swift detection of a possible burst (trigger 332287)
  85. GRB 081012 - Enhanced Swift XRT position
  86. GRB 081017, Swift-BAT refined analysis
  87. GRB 081017: REM early observations
  88. GRB 081017: Swift detection of a burst
  89. GRB 081016B, Swift-BAT refined analysis
  90. GRB 081016B: Swift/UVOT Upper Limits
  91. GRB 081011: Swift XRT refined analysis
  92. GRB 081016B: Swift-XRT Team refined Analysis
  93. GRB 081016B: Enhanced Swift-XRT position
  94. GRB 081016B: ROTSE-III Optical Limits
  95. GRB 081016B: Swift detection of a burst
  96. GRB 081011: Enhanced Swift-XRT position
  97. Swift detection of flare on CC Eri
  98. GRB 081016: A long GRB discovered by INTEGRAL
  99. Trigger 331721 Due to Swift startracker loss-of-lock
  100. Detection of flare star Algol in Swift-BAT slew data

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