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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"

45622 results found.

  1. GRB 100906A: Swift/UVOT Observations
  2. GRB100906A: Errata of MITSuME Okayama about observation time
  3. GRB100906A: MITSuME Okayama Optical Observation
  4. GRB 100906A: Ondrejov 65cm observations
  5. GRB 100906A: TLS Multicolor Observations
  6. GRB 100905A: Swift/UVOT Upper Limits
  7. GRB 100901A: TLS observations, SDSS calibration, decay slope
  8. GRB 100906A: MASTER preliminary prompt+afterglow lc
  9. GRB 100901A: ISON-NM optical observations
  10. GRB 100906A: Swift-BAT refined analysis
  11. GRB 100906A: UKIRT zYJHK Observation
  12. GRB 100906A: MASTER preliminary polarization prompt light curve
  13. GRB 100906A: Gemini-N/GMOS redshift
  14. GRB 100906A : Faulkes Telescope North optical observations
  15. GRB 100906A: MASTER early OT observations
  16. GRB 100906A: Swift detection of a burst with an optical afterglow
  17. GRB 100829A: MASTER optical observations
  18. GRB100905A: Optical upper limits at IAO
  19. GRB100905A: MITSuME Okayama optical upper limits
  20. GRB 100905A: Swift-XRT refined analysis.
  21. GRB 100905A: UKIRT zJHK Observation
  22. GRB 100901A: Possible WSRT Radio Detection
  23. GRB100905A: 1.5m OSN upper limit
  24. GRB 100905A: Enhanced Swift-XRT position
  25. GRB 100905A: Swift-BAT refined analysis
  26. GRB100904A: BOOTES-3 Upper Limit
  27. GRB 100905A: MASTER Prompt Optical Observations
  28. GRB 100905A: Faulkes Telescope North observations
  29. GRB 100905A: Swift detection of a burst
  30. Optical observations of GRB 100901A
  31. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  32. GRB 100901A: Submm observations from SMA
  33. GRB 100902A: UKIRT JK Observation
  34. GRB 100902A: GROND observations; afterglow candidate
  35. GRB 100901A: UKIRT zYJHK Observation
  36. GRB 100904A: Swift-BAT refined analysis
  37. GRB100902A: Optical upper limits at IAO
  38. GRB10901A: Optical observations at IAO
  39. Konus-Wind observation of GRB 100829A
  40. GRB 100904A: Swift detection of a burst
  41. GRB 100902A: Swift-BAT refined analysis
  42. GRB 100901A: optical observation at Mt.Terskol
  43. GRB 100901A: multicolor photometry at Mt.Terskol
  44. IPN Triangulation of the very bright GRB 100829A
  45. GRB 100901A: Lightbuckets Optical Observations
  46. GRB 100901A: HCT optical observations
  47. GRB 100902A: 1.5m OSN I-band Upper Limits
  48. Tentative redshift of GRB100902A from Swift-XRT data
  49. GRB 100902A: Swift XRT refined analysis
  50. GRB 100902A: Swift/UVOT Upper Limits
  51. GRB 100902A: optical observation at Mt.Terskol
  52. GRB 100901A: optical observation at Mt.Terskol
  53. GRB 100901A: Kanata Telescope observation of the optical afterglow
  54. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  55. GRB 100902A: Enhanced Swift-XRT position
  56. GRB 100901A: TLS Observations: Break?
  57. GRB100901A: Errata of MITSuME Okayama about reference catalog
  58. GRB 100902A: MASTER Prompt Optical Observations
  59. GRB 100901A: ISON-NM optical observations
  60. GRB 100902A: Faulkes Telescope South observations
  61. GRB 100902A: MASTER Optical Early Limit
  62. GRB 100902A: Swift detection of a burst
  63. GRB 100901A: 1.5m OSN BVRI-band observations.
  64. GRB 100901A: ROTSE-III Detection
  65. GRB 100901A: MASTER optical flare at 420s discovery
  66. GRB 100901A: Vega telescope optical afterglow observation
  67. Swift/UVOT Observations of GRB100901A
  68. GRB 100901A : HCT optical observations
  69. GRB 100901A: SARA-N observations
  70. GRB 100901A: THO optical observations
  71. GRB100901A: MITSuME Okayama Optical Observation
  72. GRB 100901A: Swift-XRT Team refined analysis
  73. GRB 100901A - NOT optical observation
  74. GRB 100901A: Swift-BAT refined analysis
  75. GRB 100901A: optical observation at Mt.Terskol
  76. GRB 100901A: Enhanced Swift-XRT position
  77. GRB 100901A: optical observation at Mt.Terskol
  78. GRB 100901A: MASTER power low decay
  79. GRB 100901A: Gemini-N Redshift
  80. GRB 100901A: MASTER: the OT brightenning
  81. GRB 100901A: confirmation of the afterglow
  82. GRB 100901A: MASTER Optical Early Limits
  83. GRB 100901A: Faulkes Telescope North afterglow candidate
  84. GRB 100901A: Swift detection of a burst with an optical afterglow
  85. Konus-Wind observation of GRB 100826A
  86. GRB 100829.9: MASTER Optical Limits
  87. IPN triangulation of GRB 100826A
  88. GRB100826A: Fermi-LAT Observations
  89. GRB 100823A: optical upper limit
  90. GRB 100814A: Maidanak optical observations
  91. GRB 100823A: optical observations
  92. GRB 100823A: MAXI/GSC detection
  93. GRB 100725B: Mondy optical upper limit
  94. GRB 100725B: Maidanak optical upper limit
  95. GRB 100823A: Swift/UVOT Evidence for Fading Afterglow Emission
  96. GRB100807A: R band observations
  97. GRB100823A : MOA optical observation
  98. GRB 100823A: Candidate IR afterglow
  99. GRB 100823A: Swift XRT refined analysis
  100. GRB 100823A: VLT/X-Shooter spectroscopy

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