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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"

42601 results found.

  1. GRB 140423A: TNG NIR observations
  2. GRB 140423A pODI/WIYN afterglow photometry
  3. GRB 140423A: Swift-XRT refined Analysis
  4. GRB 140423A: Swift-BAT refined analysis
  5. Swift Trigger 596958 is positionally consistent with V* DG CVn/2XMM J133146.4+291635
  6. Swift Trigger 596958 is probably the flare star: DG CVn
  7. GRB 140423A: KAIT Optical Detection
  8. GRB 140423A: Enhanced Swift-XRT position
  9. GRB 140423A: Nanshan optical upper limit
  10. GRB 140423A: P60 Observations
  11. GRB 140423A: Fermi GBM observation
  12. GRB 140423A: Gemini-N redshift
  13. GRB 140419A, LOAO R-band observations
  14. GRB 140423A: ISON-MN early photometry and correction to the GCN circ. 16143
  15. GRB 140423A: Swift/UVOT detection of a possible counterpart
  16. GRB 140423A: Swift-XRT observations
  17. GRB 140423A: ROTSE-III Detection of Optical Counterpart
  18. GRB 140423A optical observations with pODI/WIYN at KPNO
  19. GRB 140423A: optical afterglow candidate
  20. GRB 140423A: Swift detection of a burst
  21. GRB 140419A: Mondy optical observations
  22. GRB 140419A: Refined NOT photometry
  23. GRB 140419A: Continued RATIR Optical and NIR Observations
  24. GRB140419A: NOT optical observations
  25. GRB 140419A: KAIT Refined Analysis
  26. GRB 140419A: Continued RATIR Optical and NIR Observations
  27. Swift Trigger 596641 is not a GRB
  28. Konus-Wind observation of GRB 140419A
  29. GRB 140419A: Swift UVOT refined analysis
  30. GRB 140419A: P60 Observations
  31. GRB 140419A: Swift-XRT refined Analysis
  32. GRB 140419A: Swift-BAT refined analysis
  33. GRB 140419A: T24 optical observations
  34. GRB 140419A: Gemini-N redshift
  35. GRB 140419A: Enhanced Swift-XRT position
  36. GRB140419A: UVOT detects fading afterglow in white but not in u filter
  37. GRB 140419A: CARMA early 3mm detection
  38. GRB 140419A: RATIR Optical and NIR Observations
  39. GRB 140419A: ROTSE-III Detection of Optical Counterpart
  40. GRB 140419A (Swift trigger 596426) : KAIT optical candidate
  41. GRB 140419A: Swift detection of a burst with optical afterglow
  42. Konus-Wind observation of GRB 140416A
  43. IPN Triangulation of GRB 140416A (long/very intense)
  44. GRB 140416A: Fermi GBM detection
  45. GRB 140414A: Swift/UVOT Upper Limit
  46. GRB 140414A: Swift-XRT observations
  47. GRB 140414A: TNG optical observations
  48. GRB 140414A: Swift-BAT refined analysis
  49. GRB 140414A: Short burst found in ground analysis of BAT slew data
  50. Konus-Wind observation of GRB 140413A
  51. GRB 140413A: Swift-XRT refined Analysis
  52. GRB 140413A: Swift-BAT refined analysis
  53. GRB 140412A: Swift-XRT refined Analysis
  54. GRB 140412A: Swift-BAT refined analysis
  55. GRB 140413A: TAROT La Silla observatory optical observations
  56. GRB 140413A: Swift-XRT observations
  57. GRB 140412A: Enhanced Swift-XRT position
  58. GRB 140413A: GROND afterglow candidate
  59. Swift Trigger 595616: a possible GRB
  60. GRB 140412A: Swift detection of a burst
  61. GRB 140408A: 1.5m OSN optical upper limit
  62. Swift Trigger 595345 is not an astrophysical source
  63. Swift-BAT trigger 595162 is noise
  64. Fermi418277210: iPTF optical observations
  65. GRB 140408A: RATIR Optical Upper Limits
  66. GRB 140408A: Swift-BAT refined analysis
  67. GRB 140408A: GROND Detection of an Afterglow Candidate
  68. GRB 140408A: Swift-XRT refined Analysis
  69. GRB 140408A: Enhanced Swift-XRT position
  70. GRB 140408A: Fermi GBM detection
  71. Swift Trigger 595162: a possible GRB
  72. GRB 140408A: Swift detection of a burst
  73. GRB 140406A: Fermi GBM observation
  74. GRB 140402A: Deep limit on the optical afterglow from Magellan observations
  75. GRB 111225A: Archeological redshift of the Christmas Burst 2011 from GTC
  76. GRB 140402A: Swift/UVOT Upper Limits
  77. GRB 140331A: Continued RATIR Optical and NIR Observations
  78. GRB 140402A: Swift-XRT observations
  79. GRB 140402A: MASTER optical observations
  80. GRB 140402A BAT refined analysis
  81. GRB 140402A: Marginal BAT detection
  82. GRB 140402A: Fermi GBM detection
  83. GRB 140402A: Fermi-LAT detection of a burst
  84. Swift trigger 594286: Is likely a noise trigger
  85. GRB 140330A: Fermi GBM observation
  86. GRB 140331A: Swift-XRT refined Analysis
  87. GRB 140301A: Zadko observatory - Gingin optical observations
  88. GRB 140331A: Swift-BAT refined analysis
  89. Retraction of the Fermi/LAT high-energy counterpart for GRB 140330A
  90. GRB 140302A: TAROT La Silla observatory optical observations
  91. GRB 140323A: Zadko observatory - Gingin optical observations
  92. GRB 140330A: intense and persistent gamma-ray emission detected by AGILE
  93. GRB 140331A: Zadko observatory - Gingin optical observations
  94. Konus-Wind observation of GRB 140330A
  95. GRB 140129B: AAO optical upper limit
  96. GRB 140129A: Mondy optical observations
  97. GRB 140331A: Enhanced Swift-XRT position
  98. IPN triangulation of GRB 130330A
  99. GRB 140331A: RATIR Optical and NIR Observations
  100. GRB 140331A: Swift detection of a burst

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