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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"
  1. GRB 130606A: AAO optical observations
  2. Trigger 557640: Swift detection of burst from SGR J1745-29
  3. GRB 130606A: P60 Observations
  4. Konus-Wind observation of GRB 130606B
  5. GRB 130606A: PAIRITEL NIR Afterglow Observations
  6. GRB 130606B; Fermi GBM observation
  7. GRB 130606A: LOAO IZY Observation
  8. GRB 130606A: RATIR r'-band Dropout
  9. GRB 130606A: MMT Spectroscopy
  10. GRB 130606A:T100 observations
  11. GRB 130606A: 10.4m GTC refined redshift z = 5.91
  12. GRB 130606B: Fermi-LAT detection of a bright hard burst
  13. GRB 130606A: Errata Ks magnutide in GCN 14792
  14. GRB 130606A: Errata of J and Ks magnitudes in GCN 14784
  15. GRB 130606A: Errata of J and Ks magnitudes in GCN 14784
  16. GRB130606A: Montarrenti Observatory afterglow detection
  17. GRB 130606A: 10.4m GTC spectroscopy indicates z = 6.1
  18. Virtual Telescope observations of GRB 130606A
  19. GRB 130605A: Swift-XRT refined Analysis
  20. GRB 130605A: Swift-BAT refined analysis
  21. Swift Trigger 557466 is not astrophysical
  22. GRB 130606A - Liverpool Telescope Optical Afterglow Confirmation
  23. GRB 130606A: IRSF NIR Observation
  24. GRB 130606A: NOT afterglow detection
  25. GRB 130606A: optical afterglow with BOOTES-2/TELMA and 1.23m CAHA
  26. GRB 130606A: Swift detection of a burst
  27. GRB 130605A: Swift/UVOT Detection
  28. GRB 130604A: Swift-BAT refined analysis
  29. GRB 130605A: Continued Skynet/PROMPT observations
  30. GRB 130605A: TAROT La Silla observatory optical decay
  31. GRB 130605A: Skynet/PROMPT detection of a fading afterglow
  32. GRB 130605A: TAROT La Silla observatory optical detection of the afterglow
  33. GRB 130605A: GROND afterglow candidate
  34. GRB 130605A: Swift detection of a burst
  35. GRB 130603B: rest-frame energetics in gamma-rays
  36. Konus-Wind observation of GRB 130603B
  37. GRB 130603B: MASTER-Net early observations and optical sloap limit
  38. GRB 130603B: AMI-LA 15GHz observations
  39. GRB 130604A: Swift/UVOT Upper Limits
  40. Swift Trigger 557466 is probably not real.
  41. GRB 130604A: Swift-XRT refined Analysis
  42. GRB 130604B: Fermi GBM detection
  43. GRB 130603B: RATIR Optical and NIR Observations
  44. GRB 130604A: Enhanced Swift-XRT position
  45. GRB 130604A: Gemini North Spectroscopy
  46. GRB 130603B: P60 Observations
  47. GRB 130604A: MITSuME Okayama upper limits
  48. GRB130603B: Swift/UVOT detection
  49. GRB 130604A: further ISON-NM optical observation
  50. GRB 130603B: VLT/X-shooter redshift confirmation
  51. GRB 130604A: ISON-NM optical upper limit
  52. GRB 130603A: MITSuME Akeno Optical observation
  53. GRB 130604A: KAIT optical upper limit
  54. GRB 130604A: P60 optical afterglow candidate
  55. GRB 130604A: Swift detection of a burst
  56. GRB 130603B: 5.8 GHz VLA detection
  57. GRB 130603A: SON optical observations
  58. GRB 130603B: Swift-XRT refined Analysis
  59. GRB 130603B: Gemini Observations
  60. GRB 130603B: optical follow-up and independent GTC redshift determination and afterglow spectrum
  61. GRB 130603B: Swift-BAT Spectral lag analysis
  62. GRB 130603B: Magellan redshift confirmation
  63. GRB 130603B: Short GRB afterglow spectrum from GTC
  64. GRB 130603B: Afterglow detection from NOT
  65. GRB 130603B: WHT optical afterglow candidate
  66. GRB 130603B: Swift-BAT refined analysis
  67. GRB 130603A: Swift-XRT refined Analysis
  68. GRB 130603B: Enhanced Swift-XRT position
  69. Swift/UVOT observations of GRB130603A
  70. GRB 130603A: Enhanced Swift-XRT position
  71. GRB 130603A: Swift-BAT refined analysis
  72. GRB 130603B: Swift detection of a bright short burst
  73. GRB 130603A: MITSuME Okayama Optical Observation
  74. GRB 130603A: Swift-XRT observations
  75. GRB 130603A: Swift-XRT and Swift-UVOT detections
  76. GRB 130603A: Swift detection of a burst
  77. GRB 130529A: GROND upper limits
  78. GRB 130528A: Fermi GBM detection
  79. GRB 130529A: Swift/UVOT Upper Limits
  80. GRB 130527A: Suzaku WAM observation of the prompt emission
  81. GRB 130529A: Swift-BAT refined analysis
  82. GRB 130518A: Suzaku WAM observation of the prompt emission
  83. GRB 130529A: Swift-XRT refined Analysis
  84. GRB 130529A: Enhanced Swift-XRT position
  85. Konus-Wind observation of GRB 130528A
  86. GRB 130528A: Swift/UVOT Upper Limits
  87. Konus-Wind observation of GRB 130527A
  88. GRB 130529A: Prompt enhanced Swift-XRT position
  89. GRB 130528A: Swift-BAT refined analysis
  90. GRB 130529A: Swift detection of a burst
  91. GRB 130528A: Swift-XRT refined Analysis
  92. GRB 130527A: Swift/UVOT Upper Limits
  93. GRB 130528A: Enhanced Swift-XRT position
  94. GRB 130521A: Skynet/PROMPT detection of an extremely red afterglow
  95. GRB 130528A: optical upper limit
  96. GRB 130528A: Swift detection of a burst
  97. GRB 130527A: NOT optical counterpart
  98. GRB 130527A: RATIR Optical and NIR Observations
  99. GRB 130527A: Swift-BAT refined analysis
  100. GRB 130527A: Swift-XRT refined Analysis

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