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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"

12109 results found.

  1. GRB 090812: Skynet/PROMPT and GORT Observations
  2. Konus-Wind observation of GRB 091003A
  3. GRB 090929B: Suzaku WAM observation of the prompt emission
  4. GRB 091003: Swift XRT analysis
  5. GRB 091003A: Fermi LAT detection
  6. GRB 090929B, Swift-BAT refined analysis
  7. Konus-Wind observation of GRB 090929A
  8. Konus-Wind observation of GRB 090929B
  9. GRB 090929B: Swift-XRT refined analysis
  10. GRB 090926A: Fermi LAT and GBM refined analysis
  11. Konus-RF observation of GRB 090929A
  12. GRB 090929B: RAPTOR Discovery of Optical Counterpart
  13. Konus-Wind and Konus-RF observations of GRB 090926A
  14. GRB 090927: Swift XRT refined analysis
  15. GRB 090926A: Suzaku WAM observation of the prompt emission
  16. GRB 090926B: MAXI GSC detection
  17. GRB 090926B: Swift XRT refined analysis
  18. GRB 090926B: Swift-BAT refined analysis
  19. GRB 090926B: Swift detection of a burst
  20. GRB 090926: Fermi LAT detection
  21. GRB 090926: Fermi GBM detection
  22. GRB 090925: Fermi GBM detection
  23. GRB 090915: Swift-XRT detection of a fading X-ray counterpart
  24. GRB 090912: Swift detection of a burst
  25. GRB 090904B: Swift-BAT refined analysis
  26. GRB 090904A: ROTSE-III Optical Limits
  27. GRB090902B: Swift XRT refined analysis
  28. GRB 090902B: Fermi LAT and GBM refined analysis.
  29. GRB 090902B: Fermi LAT detection
  30. Konus-Wind observations of GRB 090831A
  31. Konus-Wind observations of GRB 090827
  32. GRB 090827: Swift XRT and UVOT observations
  33. Konus-Wind observations of GRB 090823
  34. GRB 090823 Long burst with IPN triangulation and BAT position
  35. GRB 090820B: Fermi GBM detection
  36. GRB 090820: Fermi GBM Detection of a bright burst.
  37. GRB 090817: aphotometry of USNO-B1.0 341-0096763
  38. GRB 090814A: Swift-XRT Team Refined Analysis
  39. GRB 090813: correction to GCN 9787
  40. GRB 090814: Swift detection of a burst
  41. GRB 090813: Swift-XRT refined analysis
  42. Konus-Wind observations of GRB090813
  43. GRB 090813: Liverpool Telescope afterglow confirmation
  44. GRB 090813: P60 Optical Afterglow Confirmation
  45. GRB 090812: Swift detection of a burst with an optical counterpart
  46. GRB 090809: Swift detection of a burst with a possible optical counterpart
  47. GRB 090807: Swift-XRT refined analysis
  48. GRB 090807: Swift detection of a burst
  49. IPN Triangulation and Konus-Wind observaions of GRB090727B
  50. GRB 090726: optical observation
  51. GRB 090709A : Quick look analysis of the Suzaku observation
  52. GRB 090728: Swift detection of a burst
  53. GRB 090727: Swift-BAT refined analysis
  54. GRB 090711: Fermi GBM detection
  55. GRB 090726: Swift-XRT Team refined analysis
  56. GRB 090726: Swift detection of a burst
  57. Konus-Wind and Konus-RF observations of GRB 090719
  58. Konus-RF and Konus-Wind observations of GRB 090718B
  59. Konus-Wind observations of bright hard GRB 090720B
  60. GRB 090720: Gemini-North Imaging and Optical Afterglow
  61. GRB 090720B: Fermi GBM detection
  62. Swift XRT and UVOT refned analysis of GRB 090720
  63. GRB 090720 Source found in ground processing of Swift-BAT data
  64. GRB 090720: Fermi GBM detection
  65. Konus-Wind observations of short/hard GRB 090715A
  66. GRB 090715A: Swift-BAT refined analysis
  67. Konus-Wind and Konus-RF observations of GRB 090715B
  68. GRB 090715B: Swift XRT Refined Analysis
  69. GRB 090715A: ROTSE-III Optical Limits
  70. Detection of GRB 090618 by RT-2 Experiment onboard the CORONAS-PHOTON Satellite
  71. GRB090713 optical limit by "Pi of the Sky"
  72. GRB 090621B: MTM-500 optical observations
  73. GRB 090709A: deep optical observation with the 10.4m GTC
  74. GRB 090709A: WHT LIRIS observations
  75. Konus-Wind and Konus-RF observations of GRB 090709A
  76. GRB 090709A: Swift XRT Refined Analysis
  77. GRB 090709A: Swift-BAT refined analysis
  78. GRB090709A: High Energy BAT/XRT Analysis Suggests Low to Moderate Redshift
  79. GRB 090709: ROTSE-III Optical Limits
  80. GRB 090709: Swift detection of a bright burst
  81. GRB 090708: ROTSE-III Optical Limits
  82. GRB 090708: Swift detection of a burst
  83. GRB 090704: a long GRB found in INTEGRAL off-line analysis
  84. GRB 090706: Fermi GBM detection
  85. XRF 090702: a long soft GRB localized with INTEGRAL
  86. Konus-Wind observation of GRB 090626
  87. GRB 090628: Swift detection of a burst
  88. Fermi LAT observations of GRB 090626
  89. GRB 090618: SARA Second Epoch Observations
  90. GRB 090625B: a long GRB localized by INTEGRAL
  91. GRB 090623: Fermi GBM detection
  92. GRB 090621B: P60 Observations
  93. GRB 090620: Fermi GBM detecion
  94. Konus-Wind and Konus-RF observations of GRB 090618
  95. GRB 090621B: Swift-XRT refined analysis
  96. GRB 090621B: RTT150 optical observations
  97. GRB 090621B: Optical Observations
  98. GRB 090621A: Swift-BAT refined analysis
  99. GRB 090618 15GHz radio detection
  100. GRB090618: Swift-XRT team refined analysis

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