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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"

45708 results found.

  1. GRB 100906A : Faulkes Telescope North optical observations
  2. GRB 100906A: MASTER early OT observations
  3. GRB 100906A: Swift detection of a burst with an optical afterglow
  4. GRB 100829A: MASTER optical observations
  5. GRB100905A: Optical upper limits at IAO
  6. GRB100905A: MITSuME Okayama optical upper limits
  7. GRB 100905A: Swift-XRT refined analysis.
  8. GRB 100905A: UKIRT zJHK Observation
  9. GRB 100901A: Possible WSRT Radio Detection
  10. GRB100905A: 1.5m OSN upper limit
  11. GRB 100905A: Enhanced Swift-XRT position
  12. GRB 100905A: Swift-BAT refined analysis
  13. GRB100904A: BOOTES-3 Upper Limit
  14. GRB 100905A: MASTER Prompt Optical Observations
  15. GRB 100905A: Faulkes Telescope North observations
  16. GRB 100905A: Swift detection of a burst
  17. Optical observations of GRB 100901A
  18. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  19. GRB 100901A: Submm observations from SMA
  20. GRB 100902A: UKIRT JK Observation
  21. GRB 100902A: GROND observations; afterglow candidate
  22. GRB 100901A: UKIRT zYJHK Observation
  23. GRB 100904A: Swift-BAT refined analysis
  24. GRB100902A: Optical upper limits at IAO
  25. GRB10901A: Optical observations at IAO
  26. Konus-Wind observation of GRB 100829A
  27. GRB 100904A: Swift detection of a burst
  28. GRB 100902A: Swift-BAT refined analysis
  29. GRB 100901A: optical observation at Mt.Terskol
  30. GRB 100901A: multicolor photometry at Mt.Terskol
  31. IPN Triangulation of the very bright GRB 100829A
  32. GRB 100901A: Lightbuckets Optical Observations
  33. GRB 100901A: HCT optical observations
  34. GRB 100902A: 1.5m OSN I-band Upper Limits
  35. Tentative redshift of GRB100902A from Swift-XRT data
  36. GRB 100902A: Swift XRT refined analysis
  37. GRB 100902A: Swift/UVOT Upper Limits
  38. GRB 100902A: optical observation at Mt.Terskol
  39. GRB 100901A: optical observation at Mt.Terskol
  40. GRB 100901A: Kanata Telescope observation of the optical afterglow
  41. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  42. GRB 100902A: Enhanced Swift-XRT position
  43. GRB 100901A: TLS Observations: Break?
  44. GRB100901A: Errata of MITSuME Okayama about reference catalog
  45. GRB 100902A: MASTER Prompt Optical Observations
  46. GRB 100901A: ISON-NM optical observations
  47. GRB 100902A: Faulkes Telescope South observations
  48. GRB 100902A: MASTER Optical Early Limit
  49. GRB 100902A: Swift detection of a burst
  50. GRB 100901A: 1.5m OSN BVRI-band observations.
  51. GRB 100901A: ROTSE-III Detection
  52. GRB 100901A: MASTER optical flare at 420s discovery
  53. GRB 100901A: Vega telescope optical afterglow observation
  54. Swift/UVOT Observations of GRB100901A
  55. GRB 100901A : HCT optical observations
  56. GRB 100901A: SARA-N observations
  57. GRB 100901A: THO optical observations
  58. GRB100901A: MITSuME Okayama Optical Observation
  59. GRB 100901A: Swift-XRT Team refined analysis
  60. GRB 100901A - NOT optical observation
  61. GRB 100901A: Swift-BAT refined analysis
  62. GRB 100901A: optical observation at Mt.Terskol
  63. GRB 100901A: Enhanced Swift-XRT position
  64. GRB 100901A: optical observation at Mt.Terskol
  65. GRB 100901A: MASTER power low decay
  66. GRB 100901A: Gemini-N Redshift
  67. GRB 100901A: MASTER: the OT brightenning
  68. GRB 100901A: confirmation of the afterglow
  69. GRB 100901A: MASTER Optical Early Limits
  70. GRB 100901A: Faulkes Telescope North afterglow candidate
  71. GRB 100901A: Swift detection of a burst with an optical afterglow
  72. Konus-Wind observation of GRB 100826A
  73. GRB 100829.9: MASTER Optical Limits
  74. IPN triangulation of GRB 100826A
  75. GRB100826A: Fermi-LAT Observations
  76. GRB 100823A: optical upper limit
  77. GRB 100814A: Maidanak optical observations
  78. GRB 100823A: optical observations
  79. GRB 100823A: MAXI/GSC detection
  80. GRB 100725B: Mondy optical upper limit
  81. GRB 100725B: Maidanak optical upper limit
  82. GRB 100823A: Swift/UVOT Evidence for Fading Afterglow Emission
  83. GRB100807A: R band observations
  84. GRB100823A : MOA optical observation
  85. GRB 100823A: Candidate IR afterglow
  86. GRB 100823A: Swift XRT refined analysis
  87. GRB 100823A: VLT/X-Shooter spectroscopy
  88. GRB 100823A - second epoch WHT observations
  89. GRB 100823A: TNG NIR observations
  90. GRB 100823: 1.5m OSN I-band observations
  91. GRB 100823A: Swift/UVOT Upper Limits
  92. GRB 100823A: WHT observations
  93. GRB 100823A: Swift-BAT refined analysis
  94. GRB 100823A: Enhanced Swift-XRT position
  95. GRB 100823A: Swift detection of a burst
  96. GRB 100814A: Suzaku WAM observation of the prompt emission
  97. GRB 100814A: ISON-NM optical observations
  98. IBAS Alert n. 6057 is not due to a GRB
  99. EVLA radio afterglow detection of GRB 100814A
  100. GRB 100814B: Fermi GBM detection

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