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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"

45413 results found.

  1. GRB 130606A: Errata Ks magnutide in GCN 14792
  2. GRB 130606A: Errata of J and Ks magnitudes in GCN 14784
  3. GRB 130606A: Errata of J and Ks magnitudes in GCN 14784
  4. GRB130606A: Montarrenti Observatory afterglow detection
  5. GRB 130606A: 10.4m GTC spectroscopy indicates z = 6.1
  6. Virtual Telescope observations of GRB 130606A
  7. GRB 130605A: Swift-XRT refined Analysis
  8. GRB 130605A: Swift-BAT refined analysis
  9. Swift Trigger 557466 is not astrophysical
  10. GRB 130606A: IRSF NIR Observation
  11. GRB 130606A: NOT afterglow detection
  12. GRB 130606A: optical afterglow with BOOTES-2/TELMA and 1.23m CAHA
  13. GRB 130606A: Swift detection of a burst
  14. GRB 130605A: Swift/UVOT Detection
  15. GRB 130604A: Swift-BAT refined analysis
  16. GRB 130605A: Continued Skynet/PROMPT observations
  17. GRB 130605A: TAROT La Silla observatory optical decay
  18. GRB 130605A: Skynet/PROMPT detection of a fading afterglow
  19. GRB 130605A: TAROT La Silla observatory optical detection of the afterglow
  20. GRB 130605A: GROND afterglow candidate
  21. GRB 130605A: Swift detection of a burst
  22. GRB 130603B: rest-frame energetics in gamma-rays
  23. Konus-Wind observation of GRB 130603B
  24. GRB 130603B: MASTER-Net early observations and optical sloap limit
  25. GRB 130603B: AMI-LA 15GHz observations
  26. GRB 130604A: Swift/UVOT Upper Limits
  27. Swift Trigger 557466 is probably not real.
  28. GRB 130604A: Swift-XRT refined Analysis
  29. GRB 130604B: Fermi GBM detection
  30. GRB 130603B: RATIR Optical and NIR Observations
  31. GRB 130604A: Enhanced Swift-XRT position
  32. GRB 130604A: Gemini North Spectroscopy
  33. GRB 130603B: P60 Observations
  34. GRB 130604A: MITSuME Okayama upper limits
  35. GRB130603B: Swift/UVOT detection
  36. GRB 130604A: further ISON-NM optical observation
  37. GRB 130603B: VLT/X-shooter redshift confirmation
  38. GRB 130604A: ISON-NM optical upper limit
  39. GRB 130603A: MITSuME Akeno Optical observation
  40. GRB 130604A: KAIT optical upper limit
  41. GRB 130604A: P60 optical afterglow candidate
  42. GRB 130604A: Swift detection of a burst
  43. GRB 130603B: 5.8 GHz VLA detection
  44. GRB 130603A: SON optical observations
  45. GRB 130603B: Swift-XRT refined Analysis
  46. GRB 130603B: Gemini Observations
  47. GRB 130603B: optical follow-up and independent GTC redshift determination and afterglow spectrum
  48. GRB 130603B: Magellan redshift confirmation
  49. GRB 130603B: Short GRB afterglow spectrum from GTC
  50. GRB 130603B: Afterglow detection from NOT
  51. GRB 130603B: WHT optical afterglow candidate
  52. GRB 130603B: Swift-BAT refined analysis
  53. GRB 130603A: Swift-XRT refined Analysis
  54. GRB 130603B: Enhanced Swift-XRT position
  55. Swift/UVOT observations of GRB130603A
  56. GRB 130603A: Enhanced Swift-XRT position
  57. GRB 130603A: Swift-BAT refined analysis
  58. GRB 130603B: Swift detection of a bright short burst
  59. GRB 130603A: MITSuME Okayama Optical Observation
  60. GRB 130603A: Swift-XRT observations
  61. GRB 130603A: Swift-XRT and Swift-UVOT detections
  62. GRB 130603A: Swift detection of a burst
  63. GRB 130529A: GROND upper limits
  64. GRB 130528A: Fermi GBM detection
  65. GRB 130529A: Swift/UVOT Upper Limits
  66. GRB 130527A: Suzaku WAM observation of the prompt emission
  67. GRB 130529A: Swift-BAT refined analysis
  68. GRB 130518A: Suzaku WAM observation of the prompt emission
  69. GRB 130529A: Swift-XRT refined Analysis
  70. GRB 130529A: Enhanced Swift-XRT position
  71. Konus-Wind observation of GRB 130528A
  72. GRB 130528A: Swift/UVOT Upper Limits
  73. Konus-Wind observation of GRB 130527A
  74. GRB 130529A: Prompt enhanced Swift-XRT position
  75. GRB 130528A: Swift-BAT refined analysis
  76. GRB 130529A: Swift detection of a burst
  77. GRB 130528A: Swift-XRT refined Analysis
  78. GRB 130527A: Swift/UVOT Upper Limits
  79. GRB 130528A: Enhanced Swift-XRT position
  80. GRB 130521A: Skynet/PROMPT detection of an extremely red afterglow
  81. GRB 130528A: optical upper limit
  82. GRB 130528A: Swift detection of a burst
  83. GRB 130527A: NOT optical counterpart
  84. GRB 130527A: RATIR Optical and NIR Observations
  85. GRB 130527A: Swift-BAT refined analysis
  86. GRB 130527A: Swift-XRT refined Analysis
  87. GRB 130527A: BOOTES-2 & 3.5m CAHA opt/nIR observations
  88. GRB 130527A: Enhanced Swift-XRT position
  89. GRB 130527A: Prompt enhanced Swift-XRT position
  90. GRB 130527A: Swift detection of a bright burst
  91. GRB 130514A: Konus-Wind and Swift/BAT joint spectral analysis
  92. Swift Trigger 556533 is not an astrophysical event
  93. GRB 130521B: Suzaku WAM observation of the prompt emission
  94. Swift Trigger 556533 is probably not an astrophysical event
  95. Konus-Wind observation of GRB 130521B
  96. GRB 130521A: Skynet/PROMPT observations
  97. IPN Triangulation of GRB 130521B
  98. GRB 130514B: Further Swift-XRT Observations
  99. GRB 130518B, Swift-BAT refined analysis
  100. GRB 130521A, Swift-BAT refined analysis

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