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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

21263 results found.

  1. GRB 100925A/MAXI J1659-152 - NOT optical observations
  2. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  3. GRB 100924A: GROND detection of an optical/NIR afterglow
  4. GRB 100925A: Swift detection of a burst
  5. GRB 100917A: TAROT La Silla observatory optical observations
  6. GRB 100915A: TAROT Calern observatory optical observations
  7. GRB100906A: Ashra-1 observation of early optical emission
  8. GRB 100917A: Swift-BAT refined analysis
  9. GRB100915A: MITSuME Ishigakijima Optical upper limits
  10. GRB 100915B: GRT Optical Observation
  11. GRB 100915A: GRT Optical Observation
  12. GRB 100915A: Swift/UVOT Upper Limits
  13. GRB 100915A: Swift-BAT refined analysis
  14. GRB 100915A: Enhanced Swift-XRT position
  15. GRB 100915A: Swift detection of a likely burst
  16. Swift BAT Trigger 433953 probably not a GRB
  17. GRB100909A: MITSuME Ishigakijima Optical upper limits
  18. GRB 100909A: Swift/UVOT observations
  19. GRB 100901A: errata of GRB name in GCN 11270
  20. GRB 100901A: optical observations in Mondy and R-light curve
  21. GRB 100909A: Swift-XRT refined analysis
  22. GRB 100906A: optical observations at Mt.Terskol
  23. GRB 100901A: optical observation in Maidanak, break confirmation
  24. GRB 100909A: ROTSE-III Optical Limits
  25. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  26. GRB 100909A: Swift target of opportunity observation
  27. GRB100906A: detection at 15GHz
  28. GRB100901A: IAO optical upper limits at 4 days after the burst
  29. GRB 100901A: CrAO optical observations
  30. GRB100906A: R band observations
  31. Konus-Wind observation of GRB 100906A
  32. GRB100906A: non-detection at 15GHz
  33. GRB100906A: Optical observations at IAO
  34. GRB 100906A: Enhanced Swift-XRT position
  35. GRB 100906A: Swift/UVOT Observations
  36. GRB100906A: MITSuME Okayama Optical Observation
  37. GRB 100905A: Swift/UVOT Upper Limits
  38. GRB 100901A: TLS observations, SDSS calibration, decay slope
  39. GRB 100906A: Swift-BAT refined analysis
  40. GRB 100906A: Swift detection of a burst with an optical afterglow
  41. GRB 100829A: MASTER optical observations
  42. GRB100905A: Optical upper limits at IAO
  43. GRB100905A: MITSuME Okayama optical upper limits
  44. GRB100905A: 1.5m OSN upper limit
  45. GRB 100905A: Enhanced Swift-XRT position
  46. GRB 100905A: Swift detection of a burst
  47. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  48. GRB 100901A: Submm observations from SMA
  49. GRB100902A: Optical upper limits at IAO
  50. GRB10901A: Optical observations at IAO
  51. Konus-Wind observation of GRB 100829A
  52. IPN Triangulation of the very bright GRB 100829A
  53. Tentative redshift of GRB100902A from Swift-XRT data
  54. GRB 100902A: Swift/UVOT Upper Limits
  55. GRB 100902A: optical observation at Mt.Terskol
  56. GRB 100901A: optical observation at Mt.Terskol
  57. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  58. GRB 100902A: Enhanced Swift-XRT position
  59. GRB 100901A: ISON-NM optical observations
  60. GRB 100902A: Swift detection of a burst
  61. GRB 100901A: Vega telescope optical afterglow observation
  62. Swift/UVOT Observations of GRB100901A
  63. GRB 100901A: SARA-N observations
  64. GRB100901A: MITSuME Okayama Optical Observation
  65. GRB 100901A - NOT optical observation
  66. GRB 100901A: Swift-BAT refined analysis
  67. GRB 100901A: Enhanced Swift-XRT position
  68. GRB 100901A: Swift detection of a burst with an optical afterglow
  69. Konus-Wind observation of GRB 100826A
  70. GRB 100829.9: MASTER Optical Limits
  71. GRB 100823A: optical upper limit
  72. GRB 100814A: Maidanak optical observations
  73. GRB 100823A: optical observations
  74. GRB 100725B: Mondy optical upper limit
  75. GRB 100725B: Maidanak optical upper limit
  76. GRB100807A: R band observations
  77. GRB100823A : MOA optical observation
  78. GRB 100823A - second epoch WHT observations
  79. GRB 100823A: TNG NIR observations
  80. GRB 100823A: Swift/UVOT Upper Limits
  81. GRB 100823A: WHT observations
  82. GRB 100823A: Enhanced Swift-XRT position
  83. GRB 100823A: Swift detection of a burst
  84. GRB 100814A: Suzaku WAM observation of the prompt emission
  85. GRB 100814A: optical observations
  86. GRB100816A: MITSuME optical upper limits
  87. GRB 100814A: NOT optical observations
  88. GRB 100816A: NOT optical observations
  89. Konus-Wind observation of GRB 100814A
  90. GRB 100814A : Lulin optical observation
  91. GRB 100816A : Lulin r'-band observation
  92. GRB 100816A: Swift UVOT Observations
  93. GRB 100816A: 1.23m CAHA optical observations
  94. GRB 100816A: Enhanced Swift-XRT position
  95. GRB 100816A: Gemini-N imaging
  96. GRB 100816A: TAROT Calern observatory optical detection
  97. GRB 100816A: MASTER Optical Limits
  98. GRB100816A: TNG optical afterglow confirmation.
  99. GRB 100816A: ROTSE-III Optical Limits
  100. GRB 100816A: Swift detection of a possibly short burst with optical afterglow

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