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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"

19356 results found.

  1. GRB 110414A: Enhanced Swift-XRT position
  2. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
  3. GRB 110414A : Faulkes Telescope North observations
  4. GRB 110414A: Swift detection of a burst
  5. GRB 110411A: PAIRITEL NIR Upper Limits
  6. GRB 110412A: Swift-BAT refined analysis
  7. GRB 110411A: Swift-XRT refined Analysis
  8. GRB 110412A: Fermi GBM observation
  9. GRB 110411A: Swift/UVOT Upper Limits
  10. GRB 110412A: Swift detection of a burst
  11. GRB 110411A, Swift-BAT refined analysis
  12. GRB 110411A: Enhanced Swift-XRT position
  13. GRB 110411A: MASTER optical observations
  14. GRB 110411A: Swift detection of a burst
  15. GRB 110328A / Swift J164449.3+573451: R-band Monitoring
  16. GRB 110407A: Swift-XRT refined Analysis
  17. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  18. GRB 110328A / Swift J164449.3+573451: optical observations
  19. GRB 110328A / Swift J164449.3+573451: VLBA Observations
  20. GRB 110328A/Swift J164449.3+573451 UVOT Upper Limits
  21. GRB 110407A: MASTER optical observations
  22. GRB110407A: UVOT Upper Limits
  23. GRB 110407A: GROND Detection of the Optical Afterglow
  24. GRB 110407A: Enhanced Swift-XRT position
  25. GRB 110407A: Swift-BAT refined analysis
  26. IPN triangulation of the bright GRB110406A
  27. GRB 110407A: MASTER early optical observations
  28. GRB 110407A: Prompt enhanced Swift-XRT position
  29. GRB 110407A: Swift detection of a burst
  30. GRB 110328A/Swift J164449.3+573451: BAT recent rate increase and pre-outburst,light curve
  31. GRB 110402A: Suzaku WAM observation of the prompt emission
  32. GRB 110328/Swift J164449.3+573451: Chandra observations
  33. GRB 110328A / Swift J164449.3+573451: Keck LRIS R-band photometry
  34. GRB 110328A / Swift J164449.3+573451, HST Observations
  35. GRB 110328A / Swift J164449.3+573451: millimeter detection at PdBI
  36. GRB 110402A: Konus-Wind spectral lags and detailed energetics
  37. GRB 110402A: Fermi GBM detection
  38. GRB 110402A afterglow observation
  39. GRB 110328A / Swift J164449.3+573451: Keck/DEIMOS Optical Spectroscopy
  40. GRB 110328A/Swift J164449.3+573451: SARA-N detection
  41. GRB 110402A: Swift/UVOT detection of afterglow candidate
  42. GRB 110402A: Spectral lag indicates short hard burst
  43. Konus-Wind observation of GRB 110402A
  44. GRB 110402A: Konkoly observations
  45. GRB 110328A: Konkoly observations.
  46. GRB 110402A: Swift-BAT refined analysis
  47. GRB 110402A: Swift-XRT refined Analysis
  48. GRB 110402A: early optical limit by "Pi of the Sky"
  49. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  50. GRB 110402A: PAIRITEL NIR Upper Limits
  51. GRB 110402A: Enhanced Swift-XRT position
  52. GRB 110402A: Liverpool Telescope Observations
  53. GRB 110402A: Swift detection of a burst
  54. GRB 110328A / Swift J164449.3+573451: KASINICS NIR Observation
  55. GRB 110328A / Swift J164449.3+57345: Correction to GCN 11850
  56. GRB 110328A / Swift J164449.3+573451: Radio-optical/NIR Astrometry
  57. GRB 110328A / Swift J164449.3+573451: Infrared transient
  58. GRB 110328A / Swift J164449.3+573451: Mondy optical observations
  59. GRB 110328/Swift J164449.3+573451: Fermi observations
  60. GRB 110328A / Swift J164449.3+573451: KASINICS K-band Observation
  61. GRB 110328A / Swift J164449.3+573451
  62. GRB 110328A / Swift J164449.3+573451: EVLA observations of a brightening radio source
  63. GRB 110328A / Swift J164449.3+573451: X-ray analysis and a mini-blazar analogy
  64. GRB 110328A / Swift J164449.3+573451: Gemini and UKIRT IR observations
  65. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Detection in 2nd Epoch
  66. GRB 110328A / Swift J164449.3+573451: No optical variability of the optical counterpart
  67. GRB 110328A / Swift J164449.3+573451: beamed emission
  68. GRB 110328A / Swift J164449.3+573451: BAT refined analysis
  69. GRB 110328A / Swift J164449.3+573451: CARMA mm detection
  70. GRB 110328A / Swift J164449.3+573451: Konkoly observations
  71. GRB 110328A / Swift J164449.3+573451: LOAO R-band Observation
  72. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Upper Limits
  73. GRB 110328A / Swift J164449.3+573451: optical observations
  74. GRB 110328A / Swift J164449.3+573451: EVLA Detection
  75. GRB 110328A / Swift J164449.3+573451: optical spectroscopy from GTC
  76. GRB 110328A / Swift J164449.3+573451: NOT optical observations.
  77. GRB 110328A/ Swift J164449.3+573451 : Xinglong TNT Upper limit
  78. GRB 110328A / Swift J164449.3+573451: PTF Quiescent Optical Counterpart
  79. GRB 110328A: Enhanced Swift-XRT position
  80. GRB 110328A: a second trigger, probably a hard X-ray transient (Swift J164449.3+573451)
  81. GRB 110328A: Swift detection of a burst
  82. GRB110318B : MOA optical upper limit
  83. GRB 110319B Swift-XRT afterglow confirmation
  84. GRB 110319B BAT refined analysis
  85. GRB 110319B: Swift/UVOT Upper Limits
  86. GRB 110318B: Swift/UVOT Upper Limits
  87. GRB 110319B: GROND upper limits
  88. GRB 110319B: Swift-XRT afterglow candidate.
  89. GRB 110319B found in ground analysis of Swift-BAT data
  90. GRB 110319A: Swift/UVOT Detection
  91. GRB 110319A: Swift-BAT refined analysis
  92. GRB 110319A: Swift-XRT refined Analysis
  93. GRB 110318B: GROND upper limits
  94. GRB 110319A: Enhanced Swift-XRT position
  95. GRB 110319A: Swift detection of a burst
  96. GRB 110318B: Swift-XRT refined Analysis
  97. GRB 110318A: Fermi GBM detection
  98. GRB 110318B: Swift-BAT refined analysis
  99. GRB 110318B: Enhanced Swift-XRT position
  100. GRB 110318A: Swift-BAT refined analysis

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