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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"

35438 results found.

  1. GRB 081113: Fermi GBM detection
  2. GRB 081102: RTT150 Optical observations
  3. GRB 081110: Fermi GBM detection
  4. GRB 081110: MASTER: first optical observations Fermi GRB
  5. GRB 081109: TAROT La Silla observatory optical observations
  6. GRB 081102: MASTER refind and final results
  7. GRB 081109: GROND redshift limit and host extinction
  8. GRB 081025: Swift-XRT further analysis
  9. GRB 081024B: Swift-XRT late-time observations
  10. Swift-BAT refined analysis of trigger 334129
  11. GRB 081109B: Swift/UVOT refined analysis
  12. GRB 081109: GROND Detection of the Optical/NIR Afterglow Candidate
  13. GRB 081109A: Possible Swift-UVOT detection
  14. GRB 081109A: Faulkes Telescope South observations
  15. GRB 081109A, Swift-BAT refined analysis
  16. GRB 081109A: Swift-XRT refined analysis
  17. GRB 081109: Fermi GBM detection
  18. GRB 081109: Swift/UVOT upper limits
  19. GRB 081109A optical upper limit
  20. GRB 081109: REM NIR afterglow detection
  21. GRB 081109: Swift detection of a burst
  22. GRB 081028 - PAIRITEL NIR detection
  23. GRB 081024C: Fermi Gamma-ray Burst Monitor detection
  24. GRB 081102B: Fermi GBM detection
  25. GRB 081105B: Fermi GBM detection
  26. GRB 081107: Fermi GBM detection
  27. GRB 081104: GROND found no Optical/NIR Afterglow
  28. GRB 081105: GROND Upper Limits
  29. Radio observation of GRB 080523 with ATCA
  30. Radio observation of GRB 080520 with ATCA
  31. GRB 081105: Observations from OSN
  32. UVOT/Swift observations of GRB081105
  33. Swift-XRT observations of GRB 081105
  34. GRB 081101B: Fermi GBM detection
  35. Radio observation of GRB 080516 with ATCA
  36. GRB 081105 Swift/BAT and IPN Localization
  37. GRB 081025: Fermi GBM observation
  38. GRB 081104: GROND Detection of the Optical/NIR Afterglow Candidate?
  39. GRB 081104: refined XRT analysis
  40. GRB 081104: Enhanced Swift-XRT position
  41. GRB 081104: Swift-BAT refined analysis
  42. GRB081104: Swift/UVOT Upper Limits
  43. Fermi Detection of GRB 081102
  44. GRB 081104 : Faulkes Telescope South observations
  45. GRB 081104: Swift-XRT position
  46. GRB 081104: Swift detection of a burst
  47. Radio observation of GRB 080130 with ATCA
  48. GRB 081102: MASTER prompt optical limit
  49. GRB 081102: Swift-XRT refined analysis
  50. GRB 081102: Swift/UVOT refined analysis
  51. GRB 081102: Swift-BAT refined analysis
  52. GRB 081102: Enhanced Swift-XRT position
  53. Radio observation of GRB 080218b with ATCA
  54. Radio observation of GRB 080229a with ATCA
  55. GRB 081102: MASTER VWF promt observation
  56. GRB 081102: OPTIMA-Burst optical upper limit
  57. GRB 081102: Swift detection of a burst
  58. SGR 0501+4516: optical observations in August
  59. GRB 081101 (or SGR 0623-0006 ): Fermi GBM detection
  60. SGR 0623-0006 or GRB 081101: Swift-XRT refined analysis
  61. SGR 0623-0006 or GRB 081101: Swift-BAT/-XRT refined analysis
  62. Swift-BAT triggered on a probable GRB 081101 (trigger=333320)
  63. GRB 081024B: BTA deep optical observations
  64. GRB 081028: CrAO optical observations
  65. GRB 081024B: new Swift-XRT observations
  66. Radio observation of GRB 080229b with ATCA
  67. GRB 081029, SMARTS optical/IR afterglow observations
  68. GRB 081024B: VLA radio observation
  69. GRB 081029: UVOT Detection of the Optical Afterglow
  70. GRB 081029: PROMPT Detections
  71. GRB 081029: Redshift Confirmation from Gemini-South
  72. GRB 081029: Swift-BAT refined analysis
  73. GRB081029: Swift XRT refined analysis
  74. GRB 081025: Suzaku WAM observation of the prompt emission
  75. GRB 081024B: Suzaku WAM observation of the prompt emission
  76. GRB 081029: Enhanced Swift-XRT position
  77. GRB 081028: GROND Confirmation of the Optical/NIR Afterglow
  78. GRB 081029: REM observations
  79. Radio observation of GRB 080303 with ATCA
  80. Radio observation of GRB 080411 with ATCA
  81. GRB 081029: UVES/VLT Absorption Redshift
  82. GRB 081029: GROND Detection of the Optical/NIR Afterglow
  83. GRB 081029: ROTSE-III Detection of Optical Counterpart
  84. GRB 081029: Swift detection of a burst
  85. GRB 081028: Magellan redshift
  86. GRB 081028B: Fermi GBM detection
  87. GRB 081021: Fermi GBM detection
  88. GRB081028: UVOT detection of a brightening afterglow
  89. Swift UVOT observations of GRB081028
  90. GRB 081028: Swift-XRT refined analysis
  91. GRB 081028, Swift-BAT refined analysis
  92. GRB 081028: Enhanced Swift-XRT position
  93. GRB 081028: TAROT Calern observatory optical observations
  94. GRB 081028: optical observations at the NOT
  95. GRB 081028: GROND Detection of the Optical/NIR Afterglow Candidate
  96. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow (Corrected)
  97. Fermi LAT/GBM short-hard GRB 081024B: Possible TLS Afterglow
  98. GRB 081028: Swift detection of a burst
  99. GRB 081025: TLS upper limits
  100. GRB 081024: No radio detection with the VLA

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