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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"

36314 results found.

  1. GRB 100906A: GRAS-007 optical observations
  2. GRB100906A: R band observations
  3. Konus-Wind observation of GRB 100906A
  4. GRB100906A: non-detection at 15GHz
  5. GRB100906A: Optical observations at IAO
  6. GRB 100906A: Fermi GBM observation
  7. GRB 100906A: TLS Monitoring
  8. GRB 100901A: TLS Detection at 5.5 days
  9. GRB 100906A: Observations at the Virtual Telescope
  10. GRB 100906A: Swift-XRT refined analysis
  11. GRB 100906A: Enhanced Swift-XRT position
  12. GRB 100906A: Swift/UVOT Observations
  13. GRB100906A: MITSuME Okayama Optical Observation
  14. GRB 100906A: Ondrejov 65cm observations
  15. GRB 100906A: TLS Multicolor Observations
  16. GRB 100905A: Swift/UVOT Upper Limits
  17. GRB 100901A: TLS observations, SDSS calibration, decay slope
  18. GRB 100906A: MASTER preliminary prompt+afterglow lc
  19. GRB 100901A: ISON-NM optical observations
  20. GRB 100906A: Swift-BAT refined analysis
  21. GRB 100906A: UKIRT zYJHK Observation
  22. GRB 100906A: MASTER preliminary polarization prompt light curve
  23. GRB 100906A: Gemini-N/GMOS redshift
  24. GRB 100906A : Faulkes Telescope North optical observations
  25. GRB 100906A: MASTER early OT observations
  26. GRB 100906A: Swift detection of a burst with an optical afterglow
  27. GRB 100829A: MASTER optical observations
  28. GRB100905A: Optical upper limits at IAO
  29. GRB100905A: MITSuME Okayama optical upper limits
  30. GRB 100905A: Swift-XRT refined analysis.
  31. GRB 100905A: UKIRT zJHK Observation
  32. GRB 100901A: Possible WSRT Radio Detection
  33. GRB 100905A: Enhanced Swift-XRT position
  34. GRB 100905A: Swift-BAT refined analysis
  35. GRB100904A: BOOTES-3 Upper Limit
  36. GRB 100905A: MASTER Prompt Optical Observations
  37. GRB 100905A: Faulkes Telescope North observations
  38. GRB 100905A: Swift detection of a burst
  39. Optical observations of GRB 100901A
  40. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  41. GRB 100901A: Submm observations from SMA
  42. GRB 100902A: UKIRT JK Observation
  43. GRB 100902A: GROND observations; afterglow candidate
  44. GRB 100901A: UKIRT zYJHK Observation
  45. GRB 100904A: Swift-BAT refined analysis
  46. GRB100902A: Optical upper limits at IAO
  47. GRB10901A: Optical observations at IAO
  48. Konus-Wind observation of GRB 100829A
  49. GRB 100904A: Swift detection of a burst
  50. GRB 100902A: Swift-BAT refined analysis
  51. GRB 100901A: optical observation at Mt.Terskol
  52. GRB 100901A: multicolor photometry at Mt.Terskol
  53. IPN Triangulation of the very bright GRB 100829A
  54. GRB 100901A: Lightbuckets Optical Observations
  55. GRB 100901A: HCT optical observations
  56. GRB 100902A: 1.5m OSN I-band Upper Limits
  57. Tentative redshift of GRB100902A from Swift-XRT data
  58. GRB 100902A: Swift XRT refined analysis
  59. GRB 100902A: Swift/UVOT Upper Limits
  60. GRB 100902A: optical observation at Mt.Terskol
  61. GRB 100901A: optical observation at Mt.Terskol
  62. GRB 100901A: Kanata Telescope observation of the optical afterglow
  63. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  64. GRB 100902A: Enhanced Swift-XRT position
  65. GRB 100901A: TLS Observations: Break?
  66. GRB 100902A: MASTER Prompt Optical Observations
  67. GRB 100901A: ISON-NM optical observations
  68. GRB 100902A: Faulkes Telescope South observations
  69. GRB 100902A: MASTER Optical Early Limit
  70. GRB 100902A: Swift detection of a burst
  71. GRB 100901A: 1.5m OSN BVRI-band observations.
  72. GRB 100901A: ROTSE-III Detection
  73. GRB 100901A: MASTER optical flare at 420s discovery
  74. GRB 100901A: Vega telescope optical afterglow observation
  75. Swift/UVOT Observations of GRB100901A
  76. GRB 100901A : HCT optical observations
  77. GRB 100901A: SARA-N observations
  78. GRB 100901A: THO optical observations
  79. GRB100901A: MITSuME Okayama Optical Observation
  80. GRB 100901A: Swift-XRT Team refined analysis
  81. GRB 100901A - NOT optical observation
  82. GRB 100901A: Swift-BAT refined analysis
  83. GRB 100901A: optical observation at Mt.Terskol
  84. GRB 100901A: Enhanced Swift-XRT position
  85. GRB 100901A: optical observation at Mt.Terskol
  86. GRB 100901A: MASTER power low decay
  87. GRB 100901A: Gemini-N Redshift
  88. GRB 100901A: MASTER: the OT brightenning
  89. GRB 100901A: confirmation of the afterglow
  90. GRB 100901A: MASTER Optical Early Limits
  91. GRB 100901A: Faulkes Telescope North afterglow candidate
  92. GRB 100901A: Swift detection of a burst with an optical afterglow
  93. Konus-Wind observation of GRB 100826A
  94. GRB 100829.9: MASTER Optical Limits
  95. IPN triangulation of GRB 100826A
  96. GRB100826A: Fermi-LAT Observations
  97. GRB 100823A: optical upper limit
  98. GRB 100814A: Maidanak optical observations
  99. GRB 100823A: optical observations
  100. GRB 100823A: MAXI/GSC detection

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