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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"
  1. GRB 130912A: GROND observations
  2. GRB 130912A: KAIT optical upper limit
  3. GRB 130912A: Swift detection of a short burst
  4. GRB 130907A: AMI radio detection
  5. GRB 120419A: Swift XRT confirmation of the afterglow
  6. GRB 130907A: Continued RATIR Optical and NIR Observations
  7. GRB 130907A: RATIR Optical and NIR Observations
  8. GRB 130907A: WSRT radio detection
  9. GRB 130828A: Further Swift XRT observations
  10. GRB 130907A: Further Swift-BAT refined analysis
  11. GRB 130907A: INTEGRAL/SPI-ACS light curve
  12. Konus-Wind observation of GRB 130907A
  13. GRB 130907A, Swift-BAT refined analysis
  14. GRB 130907A: T21 optical observations
  15. GRB 130907A: VLA detection
  16. GRB 130907A: Swift-XRT refined Analysis
  17. GRB 130907A: Enhanced Swift-XRT position
  18. Errata of GRB name in GCN 15196: should have been GRB 130907A instead of GRB 120916A
  19. GRB 120916A: Fermi-LAT detection of a burst
  20. GRB 130907A: Swift/UVOT Detection
  21. GRB 130907A: Early Tautenburg detections, red afterglow
  22. GRB 130907A: Skynet DSO-14/Yerkes-41/GORT confirmation of a fading afterglow
  23. GRB 130907A: RATIR Optical and NIR Afterglow Confirmation
  24. GRB 130907A: Skynet DSO-14/Yerkes-41 detections of a possible afterglow
  25. GRB 130831A: Maidanak optical observations
  26. GRB 130831A: optical observation in Chuguev AO
  27. GRB 130831A: ISON-Kislovodsk optical observations
  28. GRB 130907A: NOT redshift
  29. GRB 130831A: optical observation in Gissar AO
  30. GRB 130831A: ISON-UAFO optical observations
  31. GRB 130907A: MASTER early OT observations
  32. GRB 130907A: Swift detection of a burst with an optical counterpart
  33. Swift follow-up results of the possible weak INTEGRAL GRB
  34. GRB 130903A: Swift/UVOT Upper Limits
  35. Swift follow-up of an INTEGRAL possible weak GRB
  36. GRB 130831A: RATIR Optical and NIR Upper Limits
  37. GRB 130822A: nearby galaxy redshifts
  38. GRB 130903A: GROND Afterglow Discovery
  39. GRB 130903A: MASTER early optical limit
  40. GRB 130903A: Fermi GBM observation
  41. GRB 130831A: JCMT SCUBA-2 sub-mm observation
  42. GRB 130903A: Swift-XRT observations
  43. Swift trigger 569022 is a new Galactic source Swift J1734.5-3027
  44. GRB 130903A: ISON-Kislovodsk optical Upper Limits
  45. GRB 130903A: GROND Upper Limits
  46. GRB 130903A: A long GRB detected by INTEGRAL
  47. GRB 130831A: Swift/UVOT Observations
  48. GRB 130831A: Montarrenti Observatory optical follow-up
  49. GRB 130831A: Optical Observations via Virtual Telescope, follow-up
  50. GRB 130831A: RATIR Optical and NIR Observations
  51. GRB 130831A: Continued Skynet/PROMPT-SSO, PROMPT-CTIO and Yerkes-41 detections
  52. GRB 130831B, Swift-BAT refined analysis
  53. GRB 130831A: VLA Observations
  54. GRB 130831A: T100 observations
  55. GRB 130831B: Swift/UVOT Upper Limits
  56. GRB 130831A: CARMA mm upper limit
  57. GRB 130831B: GROND upper limits
  58. Swift Trigger 569022: a possible GRB
  59. GRB 130831A: THO optical observation
  60. GRB 130831A, Swift-BAT refined analysis
  61. GRB 130831B: Swift-XRT refined Analysis
  62. GRB 130831A: optical observations
  63. GRB 130831A: Optical Observations via Virtual Telescope
  64. GRB 130831A: Swift-XRT refined Analysis
  65. GRB 130831A: Montarrenti Observatory optical observations
  66. GRB 130831B: Enhanced Swift-XRT position
  67. GRB 130831A: Skynet/PROMPT-SSO detections
  68. GRB 130831A: Enhanced Swift-XRT position
  69. GRB 130831A : Xinglong 60cm optical observation
  70. Konus-Wind observation of GRB 130831A
  71. GRB 130831A: Gemini-North Redshift
  72. GRB 130831A: MITSuME Akeno Optical observation
  73. GRB 130831A: Weihai optical observations
  74. GRB 130831B: Swift detection of a burst
  75. GRB 130831A: Faulkes Telescope North and South optical afterglow
  76. GRB 130831A: Swift detection of a burst with an optical counterpart
  77. IPN triangulation of GRB 130828A - error box
  78. GRB 130822A: optical upper limits
  79. GRB 130829A: AAO optical observations
  80. GRB 130828A: Swift XRT and UVOT observations
  81. GRB 130829A: NOT optical observations
  82. Correction to GCN 15132 - GRB 130828A
  83. IPN triangulation of GRB 130828A
  84. GRB 130829A: Swift detection of a burst
  85. GRB 130828A Tiled Swift observations
  86. GRB 130828A: Fermi GBM detection
  87. GRB 130828A: Fermi-LAT detection of a burst
  88. IPN triangulation of GRB130821A
  89. GRB 130822A Swift-BAT Spectral lag analysis
  90. Konus-Wind observation of GRB 130821A
  91. GRB 130821A: Weihai optical upper limit
  92. GRB 130821A: Swift-XRT observation
  93. GRB 130822A: 5.8 GHz VLA upper limit
  94. GRB 130822A: Gemini Observations
  95. GRB 130822A: Swift-XRT refined Analysis
  96. GRB 130822A: WHT ACAM observations
  97. GRB 130822A: Swift/UVOT Upper Limits
  98. GRB 130822A: Enhanced Swift-XRT position
  99. GRB 130822A, Swift-BAT refined analysis
  100. GRB 130821A: Fermi-LAT detection of a burst

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