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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"

26166 results found.

  1. GRB 110411A: PAIRITEL NIR Upper Limits
  2. GRB 110412A: Swift-BAT refined analysis
  3. GRB 110411A: optical limits from OSN
  4. GRB 110411A: Swift-XRT refined Analysis
  5. GRB 110412A: Fermi GBM observation
  6. GRB 110411A: Swift/UVOT Upper Limits
  7. GRB 110412A: Swift detection of a burst
  8. GRB 110411A, Swift-BAT refined analysis
  9. GRB 110411A: Swift detection of a burst
  10. GRB 110407A: Swift-XRT refined Analysis
  11. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  12. GRB 110328A / Swift J164449.3+573451: optical observations
  13. GRB 110328A/Swift J164449.3+573451 UVOT Upper Limits
  14. GRB110407A: UVOT Upper Limits
  15. GRB 110407A: GROND Detection of the Optical Afterglow
  16. GRB 110407A: Swift-BAT refined analysis
  17. GRB 110407A : Lulin optical afterglow detection
  18. GRB 110407A: Swift detection of a burst
  19. GRB 110328A/Swift J164449.3+573451: BAT recent rate increase and pre-outburst,light curve
  20. GRB 110402A: Suzaku WAM observation of the prompt emission
  21. GRB 110402A: LOAO Optical Observation
  22. GRB 110401A: Fermi GBM detection
  23. GRB 110402A: Fermi GBM detection
  24. GRB 110328A/Swift J164449.3+573451: SARA-N detection
  25. GRB 110402A: Swift/UVOT detection of afterglow candidate
  26. GRB 110402A: Spectral lag indicates short hard burst
  27. Konus-Wind observation of GRB 110402A
  28. GRB 110402A: Konkoly observations
  29. GRB 110402A: Swift-BAT refined analysis
  30. GRB 110402A: Swift-XRT refined Analysis
  31. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  32. GRB 110402A: PAIRITEL NIR Upper Limits
  33. GRB 110402A: Liverpool Telescope Observations
  34. GRB 110402A: Swift detection of a burst
  35. GRB 110328A / Swift J164449.3+573451: Mondy optical observations
  36. GRB 110328A / Swift J164449.3+573451
  37. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Detection in 2nd Epoch
  38. GRB 110328A / Swift J164449.3+573451: No optical variability of the optical counterpart
  39. GRB 110328A / Swift J164449.3+573451: BAT refined analysis
  40. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Upper Limits
  41. GRB 110328A / Swift J164449.3+573451: optical observations
  42. GRB 110328B: Fermi-LAT Detection
  43. GRB 110328A / Swift J164449.3+573451: optical spectroscopy from GTC
  44. GRB 110328B: Fermi GBM detection
  45. GRB 110328A / Swift J164449.3+573451: NOT optical observations.
  46. GRB 110328A/ Swift J164449.3+573451 : Xinglong TNT Upper limit
  47. GRB / X-ray transient 110328A: Gemini optical observations
  48. GRB 110328A: a second trigger, probably a hard X-ray transient (Swift J164449.3+573451)
  49. GRB 110328A: Swift detection of a burst
  50. Fermi Gamma-ray Burst Monitor trigger 322686470 (110324797) is not a GRB
  51. GRB 110319B: Swift/UVOT Upper Limits
  52. GRB 110318B: Swift/UVOT Upper Limits
  53. GRB 110319B: GROND upper limits
  54. GRB 110319B: Swift-XRT afterglow candidate.
  55. GRB 110319B found in ground analysis of Swift-BAT data
  56. GRB 110319A: Swift/UVOT Detection
  57. GRB 110319A: Swift-BAT refined analysis
  58. GRB 110319A: Swift-XRT refined Analysis
  59. GRB 110318B: GROND upper limits
  60. GRB 110319A: Swift detection of a burst
  61. GRB 110318B: Swift-XRT refined Analysis
  62. GRB 110318A: Fermi GBM detection
  63. GRB 110318B: Swift-BAT refined analysis
  64. GRB 110318A: Swift-BAT refined analysis
  65. GRB 110318B: Swift/UVOT Non-Detection of an Afterglow
  66. GRB 110318B: Swift detection of a burst
  67. GRB 110318A: Swift detection of a burst
  68. Fermi GBM trigger 321944155 (110316205) is not a GRB
  69. GRB 110315A: Swift/UVOT Upper Limits
  70. GRB 110315A: Swift-XRT refined Analysis
  71. GRB 110315A: Swift-BAT refined analysis
  72. GRB 110315A: MASTER early optical observations
  73. GRB 110315A: Swift detection of a burst
  74. GRB 110312A: Swift/UVOT Upper Limits
  75. GRB 110312A: Swift-XRT refined Analysis
  76. GRB 110312A: GROND Upper Limits
  77. GRB 110312A: Swift-BAT refined analysis
  78. GRB 110312A: Swift detection of a burst
  79. GRB 110305A: REM detection of a possible NIR afterglow
  80. GRB 110305A: Swift/UVOT Upper Limits
  81. GRB 110305A: Swift-XRT refined Analysis
  82. GRB 110305A: Swift-BAT refined analysis
  83. IBAS trigger n. 6138 is not a GRB
  84. GRB 110305A: GROND Detection of Optical Afterglow
  85. GRB 110305A: Swift detection of a burst
  86. GRB 110301A: Fermi GBM detection
  87. Swift/UVOT observations of GRB110223A
  88. No IPN GRB detected in conjunction with candidate GRB 110215
  89. GRB GRB 110223A: MASTER VWF early optical observations
  90. Swift/UVOT observations of GRB110223b
  91. GRB 110223A: Swift-BAT refined analysis
  92. GRB 110223A : early optical limit by "Pi of the Sky"
  93. GRB 110223A: Liverpool Telescope observations
  94. GRB 110223A: Swift-XRT refined Analysis
  95. GRB 110223B: Swift-XRT refined Analysis
  96. GRB 110223B: Swift-BAT refined analysis
  97. GRB 110223B: GROND Detection of Optical Afterglow Candidate
  98. GRB 110223B: Swift detection of a burst
  99. GRB 110223A: Swift detection of a burst
  100. GRB 110213B: Swift/UVOT observations

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