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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"

38417 results found.

  1. VLA Radio upper limit on GRB 081118
  2. GRB 081118: VLT redshift
  3. GRB 081118: Swift-XRT refined analysis
  4. GRB 081118: GROND detection of afterglow
  5. GRB 081118: optical afterglow candidate
  6. GRB 081118: Swift UVOT Upper Limits
  7. GRB 081118: Enhanced Swift-XRT position
  8. GRB 081118: Swift detection of a burst
  9. GRB 081109A: confirmation of possible detection host galaxy
  10. Further Swift-XRT observations of the probable GRB 081105.
  11. GRB 081113: Fermi GBM detection
  12. GRB 081110: Fermi GBM detection
  13. GRB 081109: GROND redshift limit and host extinction
  14. GRB 081025: Swift-XRT further analysis
  15. GRB 081024B: Swift-XRT late-time observations
  16. Swift-BAT refined analysis of trigger 334129
  17. GRB 081109B: Swift/UVOT refined analysis
  18. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  19. GRB 081109A: Possible Swift-UVOT detection
  20. GRB 081109A: Faulkes Telescope South observations
  21. GRB 081109A: Swift-XRT refined analysis
  22. GRB 081109: Fermi GBM detection
  23. GRB 081109: Swift/UVOT upper limits
  24. GRB 081109A optical upper limit
  25. Swift-BAT Trigger 334129: possible burst
  26. GRB 081109: REM NIR afterglow detection
  27. GRB 081109: Swift detection of a burst
  28. GRB 081028 - PAIRITEL NIR detection
  29. GRB 081024C: Fermi Gamma-ray Burst Monitor detection
  30. SGR 1806-20: Fermi GBM detection
  31. GRB 081102B: Fermi GBM detection
  32. GRB 081105B: Fermi GBM detection
  33. GRB 081107: Fermi GBM detection
  34. GRB 081104: GROND found no Optical/NIR Afterglow
  35. GRB 081105: GROND Upper Limits
  36. Radio observation of GRB 080523 with ATCA
  37. Radio observation of GRB 080520 with ATCA
  38. GRB 081105: Observations from OSN
  39. UVOT/Swift observations of GRB081105
  40. Swift-XRT observations of GRB 081105
  41. GRB 081101B: Fermi GBM detection
  42. Radio observation of GRB 080516 with ATCA
  43. GRB 081105 Swift/BAT and IPN Localization
  44. GRB 081025: Fermi GBM observation
  45. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  46. GRB 081104: refined XRT analysis
  47. GRB 081104: Enhanced Swift-XRT position
  48. GRB081104: Swift/UVOT Upper Limits
  49. Fermi-GBM detection of a Solar Flare
  50. Fermi Detection of GRB 081102
  51. GRB 081104 : Faulkes Telescope South observations
  52. GRB 081104: Swift-XRT position
  53. GRB 081104: Swift detection of a burst
  54. Radio observation of GRB 080130 with ATCA
  55. GRB 081102: Swift-XRT refined analysis
  56. GRB 081102: Swift/UVOT 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: Swift detection of a burst
  61. SGR 0501+4516: optical observations in August
  62. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  63. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  64. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  65. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  66. GRB 081024B: BTA deep optical observations
  67. GRB 081028: CrAO optical observations
  68. GRB 081024B: new Swift-XRT observations
  69. Radio observation of GRB 080229b with ATCA
  70. GRB 081029, SMARTS optical/IR afterglow observations
  71. GRB 081024B: VLA radio observation
  72. GRB 081029: UVOT Detection of the Optical Afterglow
  73. GRB 081029: Redshift Confirmation from Gemini-South
  74. GRB081029: Swift XRT refined analysis
  75. GRB 081025: Suzaku WAM observation of the prompt emission
  76. GRB 081024B: Suzaku WAM observation of the prompt emission
  77. GRB 081029: Enhanced Swift-XRT position
  78. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  79. GRB 081029: REM observations
  80. Radio observation of GRB 080303 with ATCA
  81. Radio observation of GRB 080411 with ATCA
  82. GRB 081029: UVES/VLT Absorption Redshift
  83. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  84. GRB 081029: ROTSE-III Detection of Optical Counterpart
  85. GRB 081029: Swift detection of a burst
  86. GRB 081028: Magellan redshift
  87. GRB 081028B: Fermi GBM detection
  88. GRB 081021: Fermi GBM detection
  89. GRB081028: UVOT detection of a brightening afterglow
  90. Swift UVOT observations of GRB081028
  91. GRB 081028: Swift-XRT refined analysis
  92. GRB 081028: Enhanced Swift-XRT position
  93. GRB 081028: optical observations at the NOT
  94. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  95. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  96. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  97. GRB 081028: Swift detection of a burst
  98. GRB 081024: No radio detection with the VLA
  99. GRB081024B: P200 Observations
  100. GRB 081024B: Swift-XRT further observations

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