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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"

11507 results found.

  1. GRB 130427A: Fermi-LAT refined analysis
  2. GRB 130427A: Improved Swift-XRT analysis
  3. GRB 130427A optical time series
  4. Konus-Wind observation of GRB 130427A
  5. GRB 130427A: Swift-XRT refined Analysis
  6. GRB 130427A: VLA 5 GHz detection
  7. GRB 130427B: Swift-XRT refined Analysis
  8. GRB 130427A: NOT optical photometry and redshift
  9. GRB 130427A: T100 observations
  10. GRB 130427A: Fermi-LAT detection of a burst
  11. GRB 130427B: Faulkes Telescope North afterglow detection
  12. GRB 130427B: Swift detection of a burst with optical counterpart
  13. GRB 130427A: Swift detection of a very bright burst with a likely bright optical counterpart
  14. Konus-Wind observation of GRB 130425A
  15. IPN Triangulation of GRB 130425A
  16. GRB 130420A: ROTSE-III data analysis
  17. GRB 130418A: Continued RATIR Optical and NIR Observations
  18. GRB 130420B: Fermi GBM observation
  19. GRB 130420B: Swift-XRT refined Analysis
  20. GRB 130420A: Fermi GBM observation
  21. GRB 130420A: ISON-NM optical observations
  22. GRB 130420A: Swift/UVOT Detection
  23. GRB130420B: GMG optical upper limit
  24. GRB 130420A: Swift-XRT refined Analysis
  25. GRB 130420A, Swift-BAT refined analysis
  26. GRB 130420A: GMG optical observation
  27. Konus-Wind observation of GRB 130418A
  28. GRB130420A : Xinglong TNT optical upper limit
  29. GRB 130420B: Faulkes Telescope North observations
  30. GRB 130420A: Weihai Optical Observations
  31. GRB 130420B: MASTER-Net optical observations
  32. GRB 130420A: PAIRITEL NIR detections
  33. GRB 130420A: Swift detection of a burst with an optical counterpart
  34. GRB 130418A: Swift-XRT refined Analysis
  35. Trigger 553930: Swift detection of a possible flare from HR 5110
  36. GRB 130418A, Swift-BAT refined analysis
  37. GRB130418A: VLT/X-shooter redshift confirmation
  38. GRB 130418A: GROND detection of the optical-NIR afterglow
  39. GRB 130407A: Swift-XRT observations
  40. Konus-Wind observation of GRB 130408A
  41. GRB 130408A: Liverpool Telescope Optical candidate detection
  42. GRB 130407A: MAXI/GSC detection
  43. Konus-Wind observation of GRB 130320B
  44. Konus-Wind observation of GRB 130327B
  45. GRB 130327B: Fermi-LAT detection of a burst
  46. GRB 130327A: Swift-XRT refined Analysis
  47. Konus-Wind observation of GRB 130325A
  48. GRB 130325A: Fermi LAT detection
  49. Konus-Wind observation of GRB 130320A
  50. GRB 130305A: optical upper limit in Mondy observatory
  51. GRB 130310A : Suzaku WAM observation of the prompt emission
  52. GRB 130215A: Detection of the SN with the 10.4m GTC
  53. GRB 130313A: Swift-XRT refined Analysis
  54. Konus-Wind observation of GRB 130310A
  55. IPN triangulation of GRB 130310A
  56. GRB 130310A: Fermi GBM detection
  57. GRB 130310A: Fermi-LAT detection and localization
  58. GRB 130306A: MITSuME Ishigakijima upper limits
  59. GRB 130305A BAT refined circular
  60. Konus-Wind observation of GRB 130306A
  61. GRB 130306A: Fermi GBM observation
  62. GRB 130305A: Swift/XRT detection of the afterglow
  63. Konus-Wind observation of GRB 130305A
  64. GRB 130305A found in ground analysis of Swift/BAT data
  65. GRB 121128A: optical observations in Mondy observatory
  66. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  67. Trigger 549841: Swift detection of SGR1806-20
  68. Konus-Wind observation of GRB 130219A
  69. GRB 130216A: OSN I-band observations
  70. GRB 130216A: Swift detection of a burst
  71. GRB 130215A: iTelescope T11 observations
  72. GRB 130215A: TAROT La Silla observatory optical observations
  73. GRB 130211A: Swift-XRT refined Analysis
  74. GRB 130211A: GROND detection of the afterglow
  75. GRB 130211A: Swift detection of a burst
  76. GRB 130206A: Fermi LAT Observations
  77. GRB 130206A: XRT and UVOT follow-up observations.
  78. GRB 130131B: optical upper limit in Mondy observatory
  79. GRB 130206A, Swift-BAT refined analysis
  80. GRB 130206A: Swift-XRT observations
  81. GRB 130131B: Swift-XRT refined Analysis
  82. GRB 130131A: Swift-XRT refined Analysis
  83. GRB 130131B: MITSuME Okayama optical upper limits
  84. GRB 130131B: Swift detection of a burst
  85. GRB 130131A: Swift detection of a burst
  86. Swift Trigger 547142: a probable Galactic source
  87. GRB 130122A: Swift-XRT refined Analysis
  88. GRB 130102B: MASTER synchronous observations
  89. Konus-Wind observation of GRB 130102B
  90. GRB 130102B: MAXI/GSC detection
  91. GRB 121229A: MAXI/GSC detection
  92. GRB 121226A: Swift-XRT refined Analysis
  93. GRB 121226A: MITSuME Okayama Optical upper limits
  94. GRB 121226A: Swift detection of a burst
  95. Konus-Wind observation of GRB 121225B
  96. GRB 121225B: Fermi GBM observation
  97. GRB 121225B: Fermi LAT Detection
  98. GRB 121225A: MAXI/GSC detection
  99. GRB 121209A: MAXI/GSC detection
  100. GRB 121212A: Maidanak optical observations

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