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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"

43849 results found.

  1. GRB 100902A: GROND observations; afterglow candidate
  2. GRB 100901A: UKIRT zYJHK Observation
  3. GRB 100904A: Swift-BAT refined analysis
  4. Konus-Wind observation of GRB 100829A
  5. GRB 100904A: Swift detection of a burst
  6. GRB 100902A: Swift-BAT refined analysis
  7. GRB 100901A: optical observation at Mt.Terskol
  8. GRB 100901A: multicolor photometry at Mt.Terskol
  9. GRB 100901A: Lightbuckets Optical Observations
  10. GRB 100902A: 1.5m OSN I-band Upper Limits
  11. Tentative redshift of GRB100902A from Swift-XRT data
  12. GRB 100902A: Swift XRT refined analysis
  13. GRB 100902A: optical observation at Mt.Terskol
  14. GRB 100901A: optical observation at Mt.Terskol
  15. GRB 100901A: Kanata Telescope observation of the optical afterglow
  16. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  17. GRB 100902A: Enhanced Swift-XRT position
  18. GRB 100901A: TLS Observations: Break?
  19. GRB 100902A: MASTER Prompt Optical Observations
  20. GRB 100901A: ISON-NM optical observations
  21. GRB 100902A: Faulkes Telescope South observations
  22. GRB 100902A: MASTER Optical Early Limit
  23. GRB 100902A: Swift detection of a burst
  24. GRB 100901A: 1.5m OSN BVRI-band observations.
  25. GRB 100901A: ROTSE-III Detection
  26. GRB 100901A: MASTER optical flare at 420s discovery
  27. GRB 100901A: Vega telescope optical afterglow observation
  28. Swift/UVOT Observations of GRB100901A
  29. GRB 100901A : HCT optical observations
  30. GRB 100901A: THO optical observations
  31. GRB 100901A: Swift-XRT Team refined analysis
  32. GRB 100901A - NOT optical observation
  33. GRB 100901A: Swift-BAT refined analysis
  34. GRB 100901A: optical observation at Mt.Terskol
  35. GRB 100901A: Enhanced Swift-XRT position
  36. GRB 100901A: optical observation at Mt.Terskol
  37. GRB 100901A: MASTER power low decay
  38. GRB 100901A: Gemini-N Redshift
  39. GRB 100901A: MASTER: the OT brightenning
  40. GRB 100901A: confirmation of the afterglow
  41. GRB 100901A: MASTER Optical Early Limits
  42. GRB 100901A: Faulkes Telescope North afterglow candidate
  43. GRB 100901A: Swift detection of a burst with an optical afterglow
  44. Konus-Wind observation of GRB 100826A
  45. GRB 100829.9: MASTER Optical Limits
  46. IPN triangulation of GRB 100826A
  47. GRB100826A: Fermi-LAT Observations
  48. GRB 100823A: optical upper limit
  49. GRB 100814A: Maidanak optical observations
  50. GRB 100823A: optical observations
  51. GRB 100823A: MAXI/GSC detection
  52. GRB 100725B: Mondy optical upper limit
  53. GRB 100725B: Maidanak optical upper limit
  54. GRB 100823A: Swift/UVOT Evidence for Fading Afterglow Emission
  55. GRB100807A: R band observations
  56. GRB100823A : MOA optical observation
  57. GRB 100823A: Candidate IR afterglow
  58. GRB 100823A: Swift XRT refined analysis
  59. GRB 100823A: VLT/X-Shooter spectroscopy
  60. GRB 100823A - second epoch WHT observations
  61. GRB 100823A: TNG NIR observations
  62. GRB 100823: 1.5m OSN I-band observations
  63. GRB 100823A: WHT observations
  64. GRB 100823A: Swift-BAT refined analysis
  65. GRB 100823A: Enhanced Swift-XRT position
  66. GRB 100823A: Swift detection of a burst
  67. GRB 100814A: Suzaku WAM observation of the prompt emission
  68. GRB 100814A: ISON-NM optical observations
  69. IBAS Alert n. 6057 is not due to a GRB
  70. EVLA radio afterglow detection of GRB 100814A
  71. GRB 100814B: Fermi GBM detection
  72. GRB 100814A: optical observations
  73. Konus-Wind observation of GRB 100816A
  74. GRB 100816A: 10.4-m GTC redshift confirmation
  75. GRB 100816A: Fermi GBM observation
  76. GRB 100816A: VLT and Gemini-N revised redshift
  77. GRB 100814A : Liverpool Telescope Observations
  78. GRB 100814A: NOT optical observations
  79. GRB 100816A: NOT optical observations
  80. Konus-Wind observation of GRB 100814A
  81. GRB 100814A : Lulin optical observation
  82. GRB 100816A: Gemini-N spectroscopy
  83. GRB 100816A: Swift UVOT Observations
  84. GRB100816A Swift-XRT refined analysis
  85. GRB 100816A: Swift-BAT spectral lag results
  86. GRB 100816A: 1.23m CAHA optical observations
  87. GRB 100816A, Swift-BAT refined analysis
  88. GRB 100816A: Enhanced Swift-XRT position
  89. GRB 100816A: Gemini-N imaging
  90. GRB 100816A: CQUEAN riz-band Detection, Host Galaxy?
  91. GRB100814A - interesting UVOT lightcurve.
  92. GRB 100816A: TAROT Calern observatory optical detection
  93. GRB 100816A: MASTER Optical Limits
  94. GRB100816A: TNG optical afterglow confirmation.
  95. GRB 100816A: ROTSE-III Optical Limits
  96. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  97. Swift-BAT trigger 431756 is not a burst
  98. GRB 100814A: Fermi GBM observation
  99. GRB 100814A: Submm observations from APEX
  100. Swift/UVOT Observations of GRB100814A - a clearer table.

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