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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"

26310 results found.

  1. GRB110420A: GROND detection of the Optical/NIR Afterglow Candidate
  2. GRB 110420B: Swift-XRT afterglow candidate retraction
  3. GRB 110420B: Fermi GBM observation
  4. Konus-Wind observation of GRB 110420A
  5. GRB 110420B, GROND observations
  6. GRB 110420B: Swift-BAT refined analysis
  7. GRB 110420A: Swift-BAT refined analysis
  8. GRB 110420B: Swift detection of a short hard burst
  9. GRB 110420A: Swift-XRT refined Analysis
  10. GRB 110420A: Enhanced Swift-XRT position
  11. GRB 110420A: Swift detection of a burst with optical counterpart
  12. GRB 110414A: GROND upper limits
  13. GRB 110414A: Swift-BAT Refined Analysis
  14. GRB 110414A: Swift-XRT refined Analysis
  15. GRB 110414A: Enhanced Swift-XRT position
  16. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
  17. GRB 110414A: Swift detection of a burst
  18. GRB 110412A: Swift-BAT refined analysis
  19. GRB 110411A: Swift-XRT refined Analysis
  20. GRB 110412A: Fermi GBM observation
  21. GRB 110412A: Swift detection of a burst
  22. GRB 110411A, Swift-BAT refined analysis
  23. GRB 110411A: Enhanced Swift-XRT position
  24. GRB 110411A: Swift detection of a burst
  25. GRB 110407A: Swift-XRT refined Analysis
  26. GRB 110328A / Swift J164449.3+573451: VLBA Observations
  27. GRB 110406A: Positional coincidence with NGC 404
  28. GRB110407A: UVOT Upper Limits
  29. GRB 110407A: GROND Detection of the Optical Afterglow
  30. GRB 110407A: Enhanced Swift-XRT position
  31. GRB 110407A: Swift-BAT refined analysis
  32. IPN triangulation of the bright GRB110406A
  33. GRB 110407A : Lulin optical afterglow detection
  34. GRB 110407A: Prompt enhanced Swift-XRT position
  35. GRB 110407A: Swift detection of a burst
  36. Konus-Wind observation of GRB 110406A
  37. GRB 110406A: An exceptionally bright burst detected by INTEGRAL SPI-ACS
  38. GRB 110402A: Suzaku WAM observation of the prompt emission
  39. GRB 110402A: LOAO Optical Observation
  40. ICSP VLF observation of multiple SGR-like bursts from 1E 1841-045 on Feb. 9, 2011
  41. GRB 110328A / Swift J164449.3+573451, HST Observations
  42. GRB 110328A / Swift J164449.3+573451: millimeter detection at PdBI
  43. GRB 110402A: Konus-Wind spectral lags and detailed energetics
  44. GRB 110401A: Fermi GBM detection
  45. GRB 110402A: Fermi GBM detection
  46. GRB 110402A: optical observations in Mondy
  47. GRB 110328A / Swift J164449.3+573451: Keck/DEIMOS Optical Spectroscopy
  48. GRB 110328A/Swift J164449.3+573451: SARA-N detection
  49. Konus-Wind observation of GRB 110402A
  50. GRB 110328A: Konkoly observations.
  51. GRB 110402A: Swift-BAT refined analysis
  52. GRB 110402A: Swift-XRT refined Analysis
  53. GRB 110402A: early optical limit by "Pi of the Sky"
  54. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  55. GRB 110402A: Enhanced Swift-XRT position
  56. GRB 110402A: NOT afterglow confirmation
  57. GRB 110402A: Swift detection of a burst
  58. GRB 110328A / Swift J164449.3+573451: KASINICS NIR Observation
  59. GRB 110328A / Swift J164449.3+573451: Radio-optical/NIR Astrometry
  60. GRB 110328A / Swift J164449.3+573451: Infrared transient
  61. GRB 110328A / Swift J164449.3+573451: X-ray analysis and a mini-blazar analogy
  62. GRB 110328A / Swift J164449.3+573451: Gemini and UKIRT IR observations
  63. GRB 110328A / Swift J164449.3+573451: No optical variability of the optical counterpart
  64. GRB 110328A / Swift J164449.3+573451: beamed emission
  65. GRB 110328A / Swift J164449.3+573451: Konkoly observations
  66. GRB 110328B: Fermi-LAT Detection
  67. GRB 110328A / Swift J164449.3+573451: optical spectroscopy from GTC
  68. GRB 110328B: Fermi GBM detection
  69. GRB 110328A / Swift J164449.3+573451: NOT optical observations.
  70. GRB 110328A: Enhanced Swift-XRT position
  71. GRB 110328A: Swift detection of a burst
  72. GRB110318B : MOA optical upper limit
  73. GRB 110319B BAT refined analysis
  74. GRB 110319B found in ground analysis of Swift-BAT data
  75. GRB 110319A: Swift/UVOT Detection
  76. GRB 110319A: Swift-BAT refined analysis
  77. GRB 110319A: Swift-XRT refined Analysis
  78. GRB 110319A: Enhanced Swift-XRT position
  79. GRB 110319A: Swift detection of a burst
  80. GRB 110318B: Swift-XRT refined Analysis
  81. GRB 110318A: Fermi GBM detection
  82. GRB 110318B: Swift-BAT refined analysis
  83. GRB 110318B: Enhanced Swift-XRT position
  84. GRB 110318A: Swift-BAT refined analysis
  85. GRB 110318B: Swift detection of a burst
  86. GRB 110318A: Swift detection of a burst
  87. GRB 110315A: RTT150 optical observations
  88. GRB 110315A: Swift-XRT refined Analysis
  89. GRB 110315A: Swift-BAT refined analysis
  90. GRB 110315A: Enhanced Swift-XRT position
  91. GRB 110315A: Swift detection of a burst
  92. GRB 110312A: RTT150 optical observations
  93. GRB 110312A: Swift-XRT refined Analysis
  94. GRB 110312A: Enhanced Swift-XRT position
  95. GRB 110312A: Swift-BAT refined analysis
  96. GRB 110312A: Swift detection of a burst
  97. GRB 110305A: Swift-XRT refined Analysis
  98. GRB 110305A: Enhanced Swift-XRT position
  99. GRB 110305A: Swift-BAT refined analysis
  100. GRB 110305A: GROND Detection of Optical Afterglow

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