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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"

26764 results found.

  1. Swift Trigger 557910 is not astrophysical
  2. GRB 130615A: Continued Skynet/PROMPT Observations
  3. GRB 130610A: TAROT La Silla observatory optical observations
  4. GRB 130615A: Zadko observatory - Gingin optical observations
  5. GRB 130615A: TAROT La Silla observatory optical observations
  6. GRB 130615A: Swift-XRT refined Analysis
  7. GRB 130614A: Fermi GBM detection
  8. GRB 130615A: Swift/UVOT Upper Limits
  9. GRB 130615A: Skynet/PROMPT Observations
  10. GRB 130615A: Swift-BAT refined analysis
  11. GRB 130615A: GROND afterglow candidate
  12. GRB 130615A: Swift detection of a burst
  13. GRB 130612A: Fermi GBM observation
  14. GRB 130612A: Swift/UVOT Detection
  15. GRB 130612A: Swift-XRT refined Analysis
  16. GRB 130612A: Zadko observatory - Gingin optical observations
  17. GRB 130612A: TAROT La Silla observatory optical observations
  18. GRB 130612A: RATIR Optical Observations
  19. GRB 130612A: P60 Observations
  20. GRB 130612A: Skynet/PROMPT detection of the optical afterglow
  21. GRB 130612A: PAIRITEL NIR Afterglow Observations
  22. GRB 130612A: Liverpool Telescope Afterglow detection
  23. GRB 130612A: Swift detection of a burst with an optical counterpart
  24. GRB 130609A: Swift/UVOT Upper Limits
  25. GRB 130608A: Swift/UVOT Upper Limits
  26. GRB 130609B: Fermi GBM observation
  27. GRB 130609B, Further Swift-BAT refined analysis
  28. GRB 130609B: GROND observations
  29. GRB 130609B, Swift-BAT refined analysis
  30. GRB 130610A: Swift/UVOT Observations
  31. GRB 130610A: Fermi GBM Observation
  32. GRB 130609B: Swift/UVOT Observations
  33. Konus-Wind observation of GRB 130609B
  34. GRB 130606B: Swift/UVOT Upper Limit
  35. GRB 130610A: Swift-XRT refined Analysis
  36. GRB 130609B: Swift-XRT refined Analysis
  37. GRB 130608A: Further Swift-BAT analysis
  38. GRB 130610A, Swift-BAT refined analysis
  39. GRB 130610A: P60 Observations
  40. GRB 130610A: PAIRITEL NIR Afterglow Observations
  41. GRB 130610A: Skynet/PROMPT detection of the optical afterglow
  42. GRB 130610A - Liverpool Telescope Optical Afterglow Confirmation
  43. GRB 130610A: Swift detection of a burst with an optical counterpart
  44. GRB 130609B: Swift detection of a burst with an optical counterpart
  45. GRB 130606A - Liverpool Telescope and Faulkes Telescope North optical observations
  46. GRB 130609A: Fermi GBM observation
  47. GRB 130608A: Swift-XRT refined Analysis
  48. GRB 130609A: Swift-XRT refined Analysis
  49. GRB 130608A: RATIR Optical and NIR Observations
  50. GRB 130609A, Swift-BAT refined analysis
  51. GRB 130608A: Swift-BAT refined analysis
  52. GRB 130609A: RATIR Optical and NIR Observations
  53. GRB 130609A: P60 nondetection
  54. GRB 130609A: Swift detection of a burst
  55. GRB 130608A: Swift detection of a burst
  56. GRB 130606A: Continued Skynet/PROMPT observations
  57. Swift Trigger 557674 was due to an onboard position error
  58. GRB 130606A: Continued RATIR Optical and NIR Monitoring
  59. GRB 130606B: RATIR Optical and NIR Observations
  60. Swift Trigger 557674 is a probable new Galactic transient
  61. GRB 130606B: Swift-XRT observations
  62. GRB 130606A, Swift-BAT refined analysis
  63. GRB 130606A: TAROT Calern observatory early optical observations
  64. GRB 130606A: Skynet/PROMPT detection of the optical afterglow
  65. GRB 130606A: Swift/UVOT Upper Limits
  66. GRB 130606A: Swift-XRT refined Analysis
  67. Konus-Wind observation of GRB 130605A
  68. Konus-Wind observation of GRB 130606A
  69. GRB 130606A: GROND Detection of the Optical/NIR Afterglow
  70. Trigger 557640: Swift detection of burst from SGR J1745-29
  71. GRB 130606A: PAIRITEL NIR Afterglow Observations
  72. GRB 130606B; Fermi GBM observation
  73. GRB 130606A: RATIR r'-band Dropout
  74. GRB 130606A: MMT Spectroscopy
  75. GRB 130606A:T100 observations
  76. GRB 130606B: Fermi-LAT detection of a bright hard burst
  77. GRB130606A: Montarrenti Observatory afterglow detection
  78. GRB 130605A: Swift-XRT refined Analysis
  79. GRB 130605A: Swift-BAT refined analysis
  80. Swift Trigger 557466 is not astrophysical
  81. GRB 130606A - Liverpool Telescope Optical Afterglow Confirmation
  82. GRB 130606A: Swift detection of a burst
  83. GRB 130605A: Swift/UVOT Detection
  84. GRB 130604A: Swift-BAT refined analysis
  85. GRB 130605A: Continued Skynet/PROMPT observations
  86. GRB 130605A: Skynet/PROMPT detection of a fading afterglow
  87. GRB 130605A: TAROT La Silla observatory optical detection of the afterglow
  88. GRB 130605A: GROND afterglow candidate
  89. GRB 130605A: Swift detection of a burst
  90. Konus-Wind observation of GRB 130603B
  91. GRB 130603B: MASTER-Net early observations and optical sloap limit
  92. GRB 130603B: AMI-LA 15GHz observations
  93. GRB 130604A: Swift/UVOT Upper Limits
  94. Swift Trigger 557466 is probably not real.
  95. GRB 130604A: Swift-XRT refined Analysis
  96. GRB 130604B: Fermi GBM detection
  97. GRB 130603B: RATIR Optical and NIR Observations
  98. GRB 130604A: Gemini North Spectroscopy
  99. GRB 130603B: P60 Observations
  100. GRB130603B: Swift/UVOT detection

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