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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

38608 results found.

  1. GRB 090912: Swift detection of a burst
  2. GRB 090910: Fermi GBM detection
  3. GRB 090823: Swift XRT confirmation of the X-ray afterglow
  4. GRB 090904B: GROND detection of the optical afterglow
  5. GRB 090831A: Suzaku WAM observation of the prompt emission
  6. GRB 090904A: Swift/UVOT Refined Analysis
  7. GRB 090904B: Swift/UVOT Refined Analysis
  8. GRB 090902B: Suzaku WAM observation of the prompt emission
  9. GRB 090829A: Suzaku WAM observation of the prompt emission
  10. GRB 090904B: Fermi GBM detection
  11. GRB 090904A: Swift-XRT refined analysis
  12. GRB 090904B: Swift XRT Refined Analysis
  13. GRB 090904B: MOA-II Optical observation
  14. GRB 090904A: Enhanced Swift XRT position
  15. GRB 090902B: VLA radio detection
  16. GRB 090904A: Swift-BAT refined analysis
  17. GRB 090904B: Enhanced Swift-XRT position
  18. GRB090904A: Correction to enhanced XRT position
  19. GRB 090904A: Enhanced Swift-XRT position
  20. GRB 090904A: NOT observations
  21. GRB 090902B: WSRT Radio Observation
  22. GRB090904B: REM observations
  23. GRB 090904B: Swift detection of a burst
  24. GRB 090904A: ROTSE-III Optical Limits
  25. GRB 090904: Swift detection of a burst
  26. GRB 090902B: ROTSE-III Detection of Optical Afterglow
  27. GRB 090902B: Swift/UVOT refined analysis
  28. GRB090902B: Swift XRT refined analysis
  29. GRB 090902B: Faulkes Telescope North observations
  30. GRB 090902B: GROND NIR Afterglow Observations
  31. GRB 090902B: Gemini-N absorption redshift
  32. GRB 090902B: Enhanced Swift-XRT position
  33. GRB090902B: Swift/UVOT observations
  34. GRB 090902B: Swift/XRT Afterglow Candidate
  35. GRB 090902B: Fermi LAT detection
  36. GRB 090902B: Fermi GBM detection of a bright burst
  37. GRB 090902: Fermi GBM detection
  38. GRB 090831A: IPN Triangulation
  39. GRB 090831C: GROND upper limits
  40. Konus-Wind observations of GRB 090831A
  41. Swift Trigger 361477, called GRB090831B, is probably not real.
  42. GRB090831C: Swift/UVOT upper limits
  43. GRB 090831B: MITSuME optical upper limits
  44. GRB 090831C: Swift XRT Refined Analysis
  45. GRB 090829B: Fermi GBM Detection
  46. GRB 090831C: Enhanced Swift-XRT position
  47. GRB 090831C: Swift detection of a burst
  48. GRB 090831B, RIMOTS optical upper limits
  49. GRB 090831: MAXI GSC detection
  50. GRB 090831B: Swift detection of a possible burst
  51. GRB 090831: Fermi GBM detection
  52. GRB090829: Fermi GBM Detection
  53. Konus-Wind observations of GRB 090827
  54. GRB 090827: Swift XRT and UVOT observations
  55. GRB 090827 Burst discovered in BAT ground analysis
  56. GRB 090826: Fermi GBM detection
  57. GRB 090828: Fermi GBM detection
  58. Fermi Gamma-ray Burst Monitor trigger 273123112 is not a GRB
  59. GRB090817: Keck/LRIS Spectroscopy
  60. GRB 090823: Swift XRT possible detection of the X-ray afterglow
  61. GRB 090817: No host galaxy, no supernova
  62. Konus-Wind observations of GRB 090823
  63. GRB 090823 Long burst with IPN triangulation and BAT position
  64. GRB 090817: Swift/UVOT Observations of a Possible Late-Time Brightening
  65. GRB 090820: detection of a strong burst by RT-2 on board CORONAS PHOTON
  66. GRB 090820B: Fermi GBM detection
  67. GRB 090817: Swift/UVOT Observations of a Host Galaxy Candidate
  68. GRB 090820: Fermi GBM Detection of a bright burst.
  69. GRB 090817: aphotometry of USNO-B1.0 341-0096763
  70. GRB 090817: Liverpool Telescope Observations
  71. GRB 090817: optical upper limit
  72. GRB 090817: Confirmation of the X-ray afterglow
  73. GRB 090815C: Swift refined analysis
  74. GRB 090817: Fermi GBM observation
  75. GRB 090817: Swift/UVOT Upper Limits
  76. GRB 090812: Konus-Wind and Swift/BAT joint spectral analysis
  77. GRB 090813: I-band observations from 1.5m OSN telescope
  78. GRB 090817: Swift-XRT observations
  79. GRB 090814A: optical observations
  80. GRB 090813: Suzaku WAM observation of the prompt emission
  81. GRB 090812: Suzaku WAM observation of the prompt emission
  82. GRB 090817: a long GRB localized by INTEGRAL
  83. VLA radio non-detection of GRB 090812
  84. GRB 090815B: Fermi GBM detection
  85. GRB 090815: Fermi GBM detection
  86. GRB 090813: CrAO optical obsevations
  87. GRB 090814B: Confirmation of the X-ray afterglow
  88. GRB090814A: NOT optical follow-ups
  89. GRB 090814B: Swift/UVOT Upper Limits
  90. GRB 090814B: Liverpool Telescope Observations
  91. Fermi Gamma-ray Burst Monitor trigger 271934815 is not a GRB
  92. GRB 090814C: Fermi GBM detection
  93. GRB 090814B: Swift-XRT detection of a possible afterglow.
  94. GRB 090814A: Swift/UVOT Observations
  95. GRB 090814A: Swift-XRT Team Refined Analysis
  96. GRB 090814A, RIMOTS optical upper limits
  97. GRB 090813: correction to GCN 9787
  98. GRB090814A: VLT spectroscopy
  99. GRB 090814: Enhanced Swift-XRT position
  100. GRB 090814B: a long GRB localized by INTEGRAL

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