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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"

19606 results found.

  1. IPN localization of bright GRB 110518A
  2. GRB 110519A, Swift-BAT refined analysis
  3. GRB 110519A: Swift detection of a burst
  4. GRB 110503A optical observation
  5. GRB 110428A: Fermi-GBM observation
  6. GRB 110503A: TAROT Calern observatory optical observations
  7. GRB 110503A optical observations
  8. Konus-Wind observation of GRB 110503A
  9. GRB 110503A: Centimeter observation from EVLA
  10. GRB 110503A: Swift/UVOT Observations
  11. GRB 110503A: Swift-XRT refined Analysis
  12. GRB 110503A: PAIRITEL NIR Detection
  13. GRB 110503A: Swift-BAT refined analysis
  14. GRB 110503A: Enhanced Swift-XRT position
  15. GRB 110503A: Swift detection of a burst with a bright optical counterpart
  16. GRB 110426A: Swift/XRT non-detection
  17. GRB 110428A : X-ray afterglow confirmation
  18. GRB 110428A: Suzaku WAM observation of the prompt emission
  19. GRB 110422A: optical observations in CrAO
  20. GRB 110428A : Swift-XRT observations
  21. GRB 110422A: optical observations in CrAO, second epoch
  22. GRB 110422A: Suzaku WAM observation of the prompt emission
  23. GRB 110422A: optical observations in CrAO
  24. Konus-Wind observation of GRB 110422A
  25. GRB 110422A: Swift/UVOT Detection of optical afterglow
  26. GRB 110422A: Swift-XRT refined Analysis
  27. GRB 110422A: Enhanced Swift-XRT position
  28. GRB 110422A: MASTER earlier OT polarization observations
  29. GRB 110422A: Swift-BAT refined analysis
  30. GRB 110422A: Swift detection of a burst
  31. GRB 110328A/Swift J164449.3+573451: Maidanak Optical Observation
  32. GRB 110420B: Swift/UVOT Upper Limits
  33. GRB110420A: GROND detection of the Optical/NIR Afterglow Candidate
  34. GRB 110420B: Swift-XRT afterglow candidate retraction
  35. GRB 110420B: Fermi GBM observation
  36. Konus-Wind observation of GRB 110420A
  37. GRB 110420B: Spectral lag indicates short hard burst
  38. GRB 110420B, GROND observations
  39. GRB 110420A Swift/UVOT Observations
  40. GRB 110420B: Swift-XRT afterglow candidate
  41. GRB 110420B: Swift-BAT refined analysis
  42. GRB 110420A: Swift-BAT refined analysis
  43. GRB 110420B: Swift detection of a short hard burst
  44. GRB 110420A: Swift-XRT refined Analysis
  45. GRB 110420A: Enhanced Swift-XRT position
  46. GRB 110420A: Swift detection of a burst with optical counterpart
  47. GRB 110414A: GROND upper limits
  48. GRB 110414A: Swift-BAT Refined Analysis
  49. GRB 110414A: Swift/UVOT Upper limits
  50. GRB 110414A: Swift-XRT refined Analysis
  51. GRB 110414A: Enhanced Swift-XRT position
  52. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
  53. GRB 110414A : Faulkes Telescope North observations
  54. GRB 110414A: Swift detection of a burst
  55. GRB 110411A: PAIRITEL NIR Upper Limits
  56. GRB 110412A: Swift-BAT refined analysis
  57. GRB 110411A: Swift-XRT refined Analysis
  58. GRB 110412A: Fermi GBM observation
  59. GRB 110411A: Swift/UVOT Upper Limits
  60. GRB 110412A: Swift detection of a burst
  61. GRB 110411A, Swift-BAT refined analysis
  62. GRB 110411A: Enhanced Swift-XRT position
  63. GRB 110411A: MASTER optical observations
  64. GRB 110411A: Swift detection of a burst
  65. GRB 110328A / Swift J164449.3+573451: R-band Monitoring
  66. GRB 110407A: Swift-XRT refined Analysis
  67. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  68. GRB 110328A / Swift J164449.3+573451: optical observations
  69. GRB 110328A / Swift J164449.3+573451: VLBA Observations
  70. GRB 110328A/Swift J164449.3+573451 UVOT Upper Limits
  71. GRB 110407A: MASTER optical observations
  72. GRB110407A: UVOT Upper Limits
  73. GRB 110407A: GROND Detection of the Optical Afterglow
  74. GRB 110407A: Enhanced Swift-XRT position
  75. GRB 110407A: Swift-BAT refined analysis
  76. IPN triangulation of the bright GRB110406A
  77. GRB 110407A: MASTER early optical observations
  78. GRB 110407A: Prompt enhanced Swift-XRT position
  79. GRB 110407A: Swift detection of a burst
  80. GRB 110328A/Swift J164449.3+573451: BAT recent rate increase and pre-outburst,light curve
  81. GRB 110402A: Suzaku WAM observation of the prompt emission
  82. GRB 110328/Swift J164449.3+573451: Chandra observations
  83. GRB 110328A / Swift J164449.3+573451: Keck LRIS R-band photometry
  84. GRB 110328A / Swift J164449.3+573451, HST Observations
  85. GRB 110328A / Swift J164449.3+573451: millimeter detection at PdBI
  86. GRB 110402A: Konus-Wind spectral lags and detailed energetics
  87. GRB 110402A: Fermi GBM detection
  88. GRB 110402A afterglow observation
  89. GRB 110328A / Swift J164449.3+573451: Keck/DEIMOS Optical Spectroscopy
  90. GRB 110328A/Swift J164449.3+573451: SARA-N detection
  91. GRB 110402A: Swift/UVOT detection of afterglow candidate
  92. GRB 110402A: Spectral lag indicates short hard burst
  93. Konus-Wind observation of GRB 110402A
  94. GRB 110402A: Konkoly observations
  95. GRB 110328A: Konkoly observations.
  96. GRB 110402A: Swift-BAT refined analysis
  97. GRB 110402A: Swift-XRT refined Analysis
  98. GRB 110402A: early optical limit by "Pi of the Sky"
  99. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  100. GRB 110402A: PAIRITEL NIR Upper Limits

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