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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"

43000 results found.

  1. GRB 090902B: Optical afterglow candidate
  2. GRB090902B: Swift/UVOT observations
  3. GRB 090902B: Swift/XRT Afterglow Candidate
  4. GRB 090902B: Fermi LAT detection
  5. GRB 090902B: Fermi GBM detection of a bright burst
  6. GRB 090902: Fermi GBM detection
  7. GRB 090831A: IPN Triangulation
  8. GRB 090831C: GROND upper limits
  9. Konus-Wind observations of GRB 090831A
  10. Swift Trigger 361477, called GRB090831B, is probably not real.
  11. GRB090831C: Swift/UVOT upper limits
  12. GRB 090831B: MITSuME optical upper limits
  13. GRB 090831C: Swift XRT Refined Analysis
  14. GRB 090829B: Fermi GBM Detection
  15. GRB 090831C: Enhanced Swift-XRT position
  16. GRB 090831C: Swift detection of a burst
  17. GRB 090831: MAXI GSC detection
  18. GRB 090831B: Swift detection of a possible burst
  19. GRB 090831: Fermi GBM detection
  20. GRB090829: Fermi GBM Detection
  21. Konus-Wind observations of GRB 090827
  22. GRB 090827: Swift XRT and UVOT observations
  23. GRB 090827 Burst discovered in BAT ground analysis
  24. GRB 090826: Fermi GBM detection
  25. GRB 090828: Fermi GBM detection
  26. GRB 090817 - TLS Observations
  27. GRB090817: Keck/LRIS Spectroscopy
  28. GRB 090823: Swift XRT possible detection of the X-ray afterglow
  29. GRB 090823: Confirmation of Swift-BAT position by BAT Slew Survey
  30. GRB 090817: No host galaxy, no supernova
  31. Konus-Wind observations of GRB 090823
  32. GRB 090823 Long burst with IPN triangulation and BAT position
  33. GRB 090817: Swift/UVOT Observations of a Possible Late-Time Brightening
  34. GRB 090820: detection of a strong burst by RT-2 on board CORONAS PHOTON
  35. GRB 090820B: Fermi GBM detection
  36. GRB 090817: Swift/UVOT Observations of a Host Galaxy Candidate
  37. GRB 090820: MASTER-Net optical polarization observations
  38. GRB 090820: Fermi GBM Detection of a bright burst.
  39. GRB 090817: Liverpool Telescope Observations
  40. GRB 090817: Confirmation of the X-ray afterglow
  41. GRB 090815C: Swift refined analysis
  42. GRB 090817: Fermi GBM observation
  43. GRB 090817: Swift/UVOT Upper Limits
  44. GRB 090812: Konus-Wind and Swift/BAT joint spectral analysis
  45. GRB 090817: Swift-XRT observations
  46. GRB 090814A: optical observations
  47. GRB 090813: Suzaku WAM observation of the prompt emission
  48. GRB 090812: Suzaku WAM observation of the prompt emission
  49. GRB 090817: a long GRB localized by INTEGRAL
  50. VLA radio non-detection of GRB 090812
  51. GRB 090815B: Fermi GBM detection
  52. GRB 090815: Fermi GBM detection
  53. GRB 090813: CrAO optical obsevations
  54. GRB 090814B: Confirmation of the X-ray afterglow
  55. GRB 090814B: I-band observations from 1.23m CAHA telescope
  56. GRB 090814B: Swift/UVOT Upper Limits
  57. GRB 090814B: Liverpool Telescope Observations
  58. GRB 090814C: Fermi GBM detection
  59. GRB 090814B: Swift-XRT detection of a possible afterglow.
  60. GRB 090814A: Swift/UVOT Observations
  61. GRB 090814A: Swift-XRT Team Refined Analysis
  62. GRB 090814A: Swift-BAT refined analysis
  63. GRB090814A: VLT spectroscopy
  64. GRB 090814: Enhanced Swift-XRT position
  65. GRB 090814B: a long GRB localized by INTEGRAL
  66. GRB 090814: GROND Detection of an Optical Afterglow Candidate
  67. GRB 090814: Swift detection of a burst
  68. GRB 090813: Fermi GBM observation
  69. GRB 090813: Swift-XRT refined analysis
  70. GRB 090813, Swift-BAT refined analysis
  71. Konus-Wind observations of GRB090813
  72. GRB090813: Swift/UVOT upper limits
  73. GRB 090813: Enhanced Swift-XRT position
  74. GRB 090813: Liverpool Telescope afterglow confirmation
  75. GRB 090813: P60 Optical Afterglow Confirmation
  76. GRB 090813: Swift detection of a burst
  77. GRB 090812: WIRO NIR upper limit
  78. GRB 090812: Faulkes Telescope South Continued Optical Monitoring
  79. GRB 090812: RAPTOR detections during the burst
  80. GRB 090812: Swift XRT refined analysis
  81. GRB 090812 Swift-BAT Refined Analysis
  82. GRB090812: Swift/UVOT observations
  83. GRB 090812: GROND Observations of the Optical/NIR Afterglow
  84. GRB 090812: Enhanced Swift-XRT position
  85. GRB 090812 VLT redshift
  86. GRB 090812: Liverpool Telescope afterglow confirmation
  87. GRB 090812: P60 Confirmation of Optical Afterglow
  88. GRB 090812: Swift detection of a burst with an optical counterpart
  89. GRB 090807B: Fermi GBM detection
  90. GRB 090809: Further NOT optical observations
  91. VLA radio upper limit on GRB 090809
  92. GRB 090621B: MAGIC telescope GeV observation
  93. GRB 090621A: MAGIC telescope GeV observation
  94. GRB 090809 X-shooter redshift
  95. GRB 090809B: Fermi GBM detection
  96. GRB 090809: Swift-XRT refined analysis
  97. GRB090809: Swift/UVOT observations
  98. GRB 090809: Enhanced Swift-XRT position
  99. GRB 090809: Swift-BAT refined analysis
  100. GRB 090809: afterglow confirmation at the NOT

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