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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"

36003 results found.

  1. GRB100906A: R band observations
  2. Konus-Wind observation of GRB 100906A
  3. GRB100906A: non-detection at 15GHz
  4. GRB100906A: Optical observations at IAO
  5. GRB 100906A: Fermi GBM observation
  6. GRB 100906A: TLS Monitoring
  7. GRB 100901A: TLS Detection at 5.5 days
  8. GRB 100906A: Observations at the Virtual Telescope
  9. GRB 100906A: Swift-XRT refined analysis
  10. GRB 100906A: Enhanced Swift-XRT position
  11. GRB 100906A: Swift/UVOT Observations
  12. GRB100906A: MITSuME Okayama Optical Observation
  13. GRB 100906A: Ondrejov 65cm observations
  14. GRB 100906A: TLS Multicolor Observations
  15. GRB 100905A: Swift/UVOT Upper Limits
  16. GRB 100901A: TLS observations, SDSS calibration, decay slope
  17. GRB 100906A: MASTER preliminary prompt+afterglow lc
  18. GRB 100901A: ISON-NM optical observations
  19. GRB 100906A: Swift-BAT refined analysis
  20. GRB 100906A: UKIRT zYJHK Observation
  21. GRB 100906A: MASTER preliminary polarization prompt light curve
  22. GRB 100906A: Gemini-N/GMOS redshift
  23. GRB 100906A : Faulkes Telescope North optical observations
  24. GRB 100906A: MASTER early OT observations
  25. GRB 100906A: Swift detection of a burst with an optical afterglow
  26. GRB 100829A: MASTER optical observations
  27. GRB100905A: Optical upper limits at IAO
  28. GRB100905A: MITSuME Okayama optical upper limits
  29. GRB 100905A: Swift-XRT refined analysis.
  30. GRB 100905A: UKIRT zJHK Observation
  31. GRB 100901A: Possible WSRT Radio Detection
  32. GRB 100905A: Enhanced Swift-XRT position
  33. GRB 100905A: Swift-BAT refined analysis
  34. GRB100904A: BOOTES-3 Upper Limit
  35. GRB 100905A: MASTER Prompt Optical Observations
  36. GRB 100905A: Faulkes Telescope North observations
  37. GRB 100905A: Swift detection of a burst
  38. Optical observations of GRB 100901A
  39. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  40. GRB 100901A: Submm observations from SMA
  41. GRB 100902A: UKIRT JK Observation
  42. GRB 100902A: GROND observations; afterglow candidate
  43. GRB 100901A: UKIRT zYJHK Observation
  44. GRB 100904A: Swift-BAT refined analysis
  45. GRB100902A: Optical upper limits at IAO
  46. GRB10901A: Optical observations at IAO
  47. Konus-Wind observation of GRB 100829A
  48. GRB 100904A: Swift detection of a burst
  49. GRB 100902A: Swift-BAT refined analysis
  50. GRB 100901A: optical observation at Mt.Terskol
  51. GRB 100901A: multicolor photometry at Mt.Terskol
  52. IPN Triangulation of the very bright GRB 100829A
  53. GRB 100901A: Lightbuckets Optical Observations
  54. GRB 100901A: HCT optical observations
  55. GRB 100902A: 1.5m OSN I-band Upper Limits
  56. Tentative redshift of GRB100902A from Swift-XRT data
  57. GRB 100902A: Swift XRT refined analysis
  58. GRB 100902A: Swift/UVOT Upper Limits
  59. GRB 100902A: optical observation at Mt.Terskol
  60. GRB 100901A: optical observation at Mt.Terskol
  61. GRB 100901A: Kanata Telescope observation of the optical afterglow
  62. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  63. GRB 100902A: Enhanced Swift-XRT position
  64. GRB 100901A: TLS Observations: Break?
  65. GRB 100902A: MASTER Prompt Optical Observations
  66. GRB 100901A: ISON-NM optical observations
  67. GRB 100902A: Faulkes Telescope South observations
  68. GRB 100902A: MASTER Optical Early Limit
  69. GRB 100902A: Swift detection of a burst
  70. GRB 100901A: 1.5m OSN BVRI-band observations.
  71. GRB 100901A: ROTSE-III Detection
  72. GRB 100901A: MASTER optical flare at 420s discovery
  73. GRB 100901A: Vega telescope optical afterglow observation
  74. Swift/UVOT Observations of GRB100901A
  75. GRB 100901A : HCT optical observations
  76. GRB 100901A: SARA-N observations
  77. GRB 100901A: THO optical observations
  78. GRB100901A: MITSuME Okayama Optical Observation
  79. GRB 100901A: Swift-XRT Team refined analysis
  80. GRB 100901A - NOT optical observation
  81. GRB 100901A: Swift-BAT refined analysis
  82. GRB 100901A: optical observation at Mt.Terskol
  83. GRB 100901A: Enhanced Swift-XRT position
  84. GRB 100901A: optical observation at Mt.Terskol
  85. GRB 100901A: MASTER power low decay
  86. GRB 100901A: Gemini-N Redshift
  87. GRB 100901A: MASTER: the OT brightenning
  88. GRB 100901A: confirmation of the afterglow
  89. GRB 100901A: MASTER Optical Early Limits
  90. GRB 100901A: Faulkes Telescope North afterglow candidate
  91. GRB 100901A: Swift detection of a burst with an optical afterglow
  92. Konus-Wind observation of GRB 100826A
  93. GRB 100829.9: MASTER Optical Limits
  94. IPN triangulation of GRB 100826A
  95. GRB100826A: Fermi-LAT Observations
  96. GRB 100823A: optical upper limit
  97. GRB 100814A: Maidanak optical observations
  98. GRB 100823A: optical observations
  99. GRB 100823A: MAXI/GSC detection
  100. GRB 100725B: Mondy optical upper limit

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