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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"

45930 results found.

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

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