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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"

19352 results found.

  1. GRB 130612A: P60 Observations
  2. GRB 130612A: Skynet/PROMPT detection of the optical afterglow
  3. GRB 130612A: PAIRITEL NIR Afterglow Observations
  4. GRB 130612A: Liverpool Telescope Afterglow detection
  5. GRB 130612A: Swift detection of a burst with an optical counterpart
  6. GRB 130609A: Swift/UVOT Upper Limits
  7. GRB 130608A: Swift/UVOT Upper Limits
  8. GRB 130609B: Fermi GBM observation
  9. GRB 130609B, Further Swift-BAT refined analysis
  10. GRB 130609B: GROND observations
  11. GRB 130606A: CrAO optical upper limit
  12. GRB 130609A: Radio Observations (5.8, 22 and 85 GHz)
  13. GRB 130609B, Swift-BAT refined analysis
  14. GRB 130610A: ISON-NM optical observations
  15. GRB 130610A: Swift/UVOT Observations
  16. GRB 130610A: Fermi GBM Observation
  17. GRB 130609B: Swift/UVOT Observations
  18. Konus-Wind observation of GRB 130609B
  19. GRB 130606B: Swift/UVOT Upper Limit
  20. GRB 130610A: Swift-XRT refined Analysis
  21. GRB 130609B: Swift-XRT refined Analysis
  22. GRB 130610A: Enhanced Swift-XRT position
  23. GRB 130608A: Further Swift-BAT analysis
  24. GRB 130610A, Swift-BAT refined analysis
  25. GRB 130609B: Enhanced Swift-XRT position
  26. GRB 130610A: P60 Observations
  27. GRB 130610A: PAIRITEL NIR Afterglow Observations
  28. GRB 130610A: Skynet/PROMPT detection of the optical afterglow
  29. GRB 130610A - Liverpool Telescope Optical Afterglow Confirmation
  30. GRB 130610A: Swift detection of a burst with an optical counterpart
  31. GRB 130609B: Swift detection of a burst with an optical counterpart
  32. GRB 130609A: Fermi GBM observation
  33. GRB 130608A: Swift-XRT refined Analysis
  34. GRB 130609A: Swift-XRT refined Analysis
  35. GRB 130608A: RATIR Optical and NIR Observations
  36. GRB 130609A: Enhanced Swift-XRT position
  37. GRB 130609A, Swift-BAT refined analysis
  38. GRB 130608A: Swift-BAT refined analysis
  39. GRB 130608A: Enhanced Swift-XRT position
  40. GRB 130609A: RATIR Optical and NIR Observations
  41. GRB 130609A: Swift detection of a burst
  42. GRB 130608A: Swift detection of a burst
  43. GRB 130606A: Continued Skynet/PROMPT observations
  44. Swift Trigger 557674 was due to an onboard position error
  45. Swift Trigger 557674 is a probable new Galactic transient
  46. GRB 130606B: Swift-XRT observations
  47. GRB 130606A, Swift-BAT refined analysis
  48. GRB 130606A: TAROT Calern observatory early optical observations
  49. GRB 130606A: Skynet/PROMPT detection of the optical afterglow
  50. GRB 130606A: Swift/UVOT Upper Limits
  51. GRB 130603A: AAO optical observations
  52. GRB 130606A: Swift-XRT refined Analysis
  53. GRB 130606A: Enhanced Swift-XRT position
  54. Konus-Wind observation of GRB 130605A
  55. Konus-Wind observation of GRB 130606A
  56. GRB 130606A: GROND Detection of the Optical/NIR Afterglow
  57. GRB 130606A: AAO optical observations
  58. Trigger 557640: Swift detection of burst from SGR J1745-29
  59. GRB 130606A: PAIRITEL NIR Afterglow Observations
  60. GRB 130606A:T100 observations
  61. GRB 130606B: Fermi-LAT detection of a bright hard burst
  62. GRB130606A: Montarrenti Observatory afterglow detection
  63. GRB 130605A: Swift-XRT refined Analysis
  64. GRB 130605A: Swift-BAT refined analysis
  65. Swift Trigger 557466 is not astrophysical
  66. GRB 130606A - Liverpool Telescope Optical Afterglow Confirmation
  67. GRB 130606A: optical afterglow with BOOTES-2/TELMA and 1.23m CAHA
  68. GRB 130606A: Swift detection of a burst
  69. GRB 130605A: Swift/UVOT Detection
  70. GRB 130604A: Swift-BAT refined analysis
  71. GRB 130605A: Continued Skynet/PROMPT observations
  72. GRB 130605A: Skynet/PROMPT detection of a fading afterglow
  73. GRB 130605A: TAROT La Silla observatory optical detection of the afterglow
  74. GRB 130605A: GROND afterglow candidate
  75. GRB 130605A: Swift detection of a burst
  76. Konus-Wind observation of GRB 130603B
  77. GRB 130603B: MASTER-Net early observations and optical sloap limit
  78. GRB 130604A: Swift/UVOT Upper Limits
  79. Swift Trigger 557466 is probably not real.
  80. GRB 130604A: Swift-XRT refined Analysis
  81. GRB 130604A: Enhanced Swift-XRT position
  82. GRB 130604A: Gemini North Spectroscopy
  83. GRB 130603B: P60 Observations
  84. GRB130603B: Swift/UVOT detection
  85. GRB 130604A: further ISON-NM optical observation
  86. GRB 130604A: ISON-NM optical upper limit
  87. GRB 130604A: Swift detection of a burst
  88. GRB 130603B: Swift-XRT refined Analysis
  89. GRB 130603B: Swift-BAT Spectral lag analysis
  90. GRB 130603B: Swift-BAT refined analysis
  91. GRB 130603A: Swift-XRT refined Analysis
  92. GRB 130603B: Enhanced Swift-XRT position
  93. Swift/UVOT observations of GRB130603A
  94. GRB 130603A: Enhanced Swift-XRT position
  95. GRB 130603A: Swift-BAT refined analysis
  96. GRB 130603B: Swift detection of a bright short burst
  97. GRB 130603A: Swift-XRT observations
  98. GRB 130603A: Swift-XRT and Swift-UVOT detections
  99. GRB 130603A: Swift detection of a burst
  100. GRB 130529A: GROND upper limits

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