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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"

24385 results found.

  1. Konus-Wind observations of GRB 090831A
  2. Swift Trigger 361477, called GRB090831B, is probably not real.
  3. GRB 090829B: Fermi GBM Detection
  4. GRB 090831C: Swift detection of a burst
  5. GRB 090831B, RIMOTS optical upper limits
  6. GRB 090831: MAXI GSC detection
  7. GRB 090831: Fermi GBM detection
  8. GRB090829: Fermi GBM Detection
  9. Konus-Wind observations of GRB 090827
  10. GRB 090826: Fermi GBM detection
  11. GRB 090828: Fermi GBM detection
  12. GRB 090817 - TLS Observations
  13. Konus-Wind observations of GRB 090823
  14. GRB 090817: Swift/UVOT Observations of a Possible Late-Time Brightening
  15. GRB 090820: detection of a strong burst by RT-2 on board CORONAS PHOTON
  16. GRB 090820B: Fermi GBM detection
  17. GRB 090820: MASTER-Net optical polarization observations
  18. GRB 090820: Fermi GBM Detection of a bright burst.
  19. GRB 090817: aphotometry of USNO-B1.0 341-0096763
  20. GRB 090815C: Swift refined analysis
  21. GRB 090817: Fermi GBM observation
  22. GRB 090812: Konus-Wind and Swift/BAT joint spectral analysis
  23. GRB 090813: I-band observations from 1.5m OSN telescope
  24. GRB 090813: Suzaku WAM observation of the prompt emission
  25. GRB 090812: Suzaku WAM observation of the prompt emission
  26. GRB 090817: a long GRB localized by INTEGRAL
  27. GRB 090815B: Fermi GBM detection
  28. GRB 090815: Fermi GBM detection
  29. GRB 090814B: I-band observations from 1.23m CAHA telescope
  30. GRB 090814B: Liverpool Telescope Observations
  31. GRB 090814C: Fermi GBM detection
  32. GRB 090814B: Swift-XRT detection of a possible afterglow.
  33. GRB 090814A: Swift-XRT Team Refined Analysis
  34. GRB 090814A, RIMOTS optical upper limits
  35. GRB 090814A: Swift-BAT refined analysis
  36. GRB 090813: correction to GCN 9787
  37. GRB 090814B: a long GRB localized by INTEGRAL
  38. GRB 090813: Fermi GBM observation
  39. GRB 090813, Swift-BAT refined analysis
  40. Konus-Wind observations of GRB090813
  41. GRB 090813: Liverpool Telescope afterglow confirmation
  42. GRB 090812: WIRO NIR upper limit
  43. GRB 090812, RIMOTS optical upper limits
  44. GRB 090812 Swift-BAT Refined Analysis
  45. GRB090812: Swift/UVOT observations
  46. GRB 090812: Liverpool Telescope afterglow confirmation
  47. GRB 090812: P60 Confirmation of Optical Afterglow
  48. GRB 090807B: Fermi GBM detection
  49. GRB 090621B: MAGIC telescope GeV observation
  50. GRB 090621A: MAGIC telescope GeV observation
  51. GRB 090809B: Fermi GBM detection
  52. GRB 090809: Swift-BAT refined analysis
  53. GRB 090807: Liverpool Telescope observations
  54. GRB 090807: Swift-XRT refined analysis
  55. GRB 090807, Swift-BAT refined analysis
  56. GRB 090807, RIMOTS optical upper limits
  57. GRB 090802B: Fermi GBM detection
  58. IPN Triangulation and Konus-Wind observaions of GRB090727B
  59. GRB 090802: Fermi GBM detection
  60. Swift-BAT trigger 358760 is most likely not a GRB
  61. Swift trigger 358760 is probably a noise event
  62. GRB 090717A: Suzaku WAM observation of the prompt emission
  63. GRB 090709A : Quick look analysis of the Suzaku observation
  64. GRB 090728: Swift-BAT refined analysis
  65. GRB 090727: I-band observations from 1.23m CAHA
  66. GRB 090728, RIMOTS optical upper limits
  67. GRB 090728A: Faulkes Telescope North Optical Afterglow Candidate
  68. GRB 090727: Swift-BAT refined analysis
  69. GRB 090727: Liverpool Telescope Afterglow Confirmation and Optical Flare
  70. GRB 090715B: Late-time Lick 3m observations
  71. GRB 090727: Swift detection of a burst
  72. GRB 090726, Swift-BAT refined analysis
  73. GRB 090726: Afterglow candidate photometryfrom Crni Vrh
  74. GRB 090726: D50 optical observations
  75. GRB 090711: Fermi GBM detection
  76. GRB 090726: Swift-XRT position of probable counterpart
  77. GRB 090726: Swift detection of a burst
  78. Konus-Wind and Konus-RF observations of GRB 090719
  79. Konus-RF and Konus-Wind observations of GRB 090718B
  80. Konus-Wind observations of bright hard GRB 090720B
  81. IPN Triangulation of bright GRB 090720B
  82. GRB 090720: Gemini-North Imaging and Optical Afterglow
  83. GRB 090720B: Fermi GBM detection
  84. GRB 090717B: Fermi GBM detection
  85. GRB 090717: Fermi GBM detection
  86. GRB 090719: Fermi GBM detection
  87. GRB 090718B: Fermi GBM detection
  88. GRB 090718: Fermi GBM detection
  89. GRB 090720: Fermi GBM detection
  90. GRB 090715B: further NOT optical observations
  91. GRB 090715A: Suzaku WAM observation of the prompt emission
  92. Konus-Wind observations of short/hard GRB 090715A
  93. GRB 090715B: MASTER optical limit
  94. GRB 090715A: Swift-BAT refined analysis
  95. Konus-Wind and Konus-RF observations of GRB 090715B
  96. GRB 090715B: break in the optical afterglow decay
  97. GRB 090715B: Swift-BAT refined analysis
  98. GRB 090715B - Liverpool Telescope Optical Afterglow Candidate
  99. GRB 090715A: ROTSE-III Optical Limits
  100. Detection of GRB 090618 by RT-2 Experiment onboard the CORONAS-PHOTON Satellite

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