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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"

43018 results found.

  1. GRB 100905A: Swift-BAT refined analysis
  2. GRB100904A: BOOTES-3 Upper Limit
  3. GRB 100905A: MASTER Prompt Optical Observations
  4. GRB 100905A: Faulkes Telescope North observations
  5. GRB 100905A: Swift detection of a burst
  6. Optical observations of GRB 100901A
  7. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  8. GRB 100901A: Submm observations from SMA
  9. GRB 100902A: UKIRT JK Observation
  10. GRB 100902A: GROND observations; afterglow candidate
  11. GRB 100901A: UKIRT zYJHK Observation
  12. GRB 100904A: Swift-BAT refined analysis
  13. GRB100902A: Optical upper limits at IAO
  14. GRB10901A: Optical observations at IAO
  15. Konus-Wind observation of GRB 100829A
  16. GRB 100904A: Swift detection of a burst
  17. GRB 100902A: Swift-BAT refined analysis
  18. GRB 100901A: optical observation at Mt.Terskol
  19. GRB 100901A: multicolor photometry at Mt.Terskol
  20. IPN Triangulation of the very bright GRB 100829A
  21. GRB 100901A: Lightbuckets Optical Observations
  22. GRB 100901A: HCT optical observations
  23. Tentative redshift of GRB100902A from Swift-XRT data
  24. GRB 100902A: Swift XRT refined analysis
  25. GRB 100902A: Swift/UVOT Upper Limits
  26. GRB 100902A: optical observation at Mt.Terskol
  27. GRB 100901A: optical observation at Mt.Terskol
  28. GRB 100901A: Kanata Telescope observation of the optical afterglow
  29. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  30. GRB 100902A: Enhanced Swift-XRT position
  31. GRB 100901A: TLS Observations: Break?
  32. GRB100901A: Errata of MITSuME Okayama about reference catalog
  33. GRB 100902A: Faulkes Telescope South observations
  34. GRB 100902A: Swift detection of a burst
  35. GRB 100901A: 1.5m OSN BVRI-band observations.
  36. GRB 100901A: ROTSE-III Detection
  37. GRB 100901A: Vega telescope optical afterglow observation
  38. Swift/UVOT Observations of GRB100901A
  39. GRB 100901A : HCT optical observations
  40. GRB 100901A: SARA-N observations
  41. GRB 100901A: THO optical observations
  42. GRB100901A: MITSuME Okayama Optical Observation
  43. GRB 100901A: Swift-XRT Team refined analysis
  44. GRB 100901A - NOT optical observation
  45. GRB 100901A: Swift-BAT refined analysis
  46. GRB 100901A: optical observation at Mt.Terskol
  47. GRB 100901A: Enhanced Swift-XRT position
  48. GRB 100901A: MASTER power low decay
  49. GRB 100901A: Gemini-N Redshift
  50. GRB 100901A: MASTER: the OT brightenning
  51. GRB 100901A: MASTER Optical Early Limits
  52. GRB 100901A: Swift detection of a burst with an optical afterglow
  53. Konus-Wind observation of GRB 100826A
  54. GRB 100829.9: MASTER Optical Limits
  55. IPN triangulation of GRB 100826A
  56. GRB100826A: Fermi-LAT Observations
  57. GRB 100823A: optical observations
  58. GRB 100823A: MAXI/GSC detection
  59. GRB 100725B: Mondy optical upper limit
  60. GRB 100823A: Swift/UVOT Evidence for Fading Afterglow Emission
  61. GRB100823A : MOA optical observation
  62. GRB 100823A: Candidate IR afterglow
  63. GRB 100823A: Swift XRT refined analysis
  64. GRB 100823A: VLT/X-Shooter spectroscopy
  65. GRB 100823A - second epoch WHT observations
  66. GRB 100823A: TNG NIR observations
  67. GRB 100823: 1.5m OSN I-band observations
  68. GRB 100823A: Swift/UVOT Upper Limits
  69. GRB 100823A: WHT observations
  70. GRB 100823A: Swift-BAT refined analysis
  71. GRB 100823A: Enhanced Swift-XRT position
  72. GRB 100823A: Swift detection of a burst
  73. GRB 100814A: Suzaku WAM observation of the prompt emission
  74. GRB 100814A: ISON-NM optical observations
  75. IBAS Alert n. 6057 is not due to a GRB
  76. EVLA radio afterglow detection of GRB 100814A
  77. GRB 100814B: Fermi GBM detection
  78. Konus-Wind observation of GRB 100816A
  79. GRB100816A: MITSuME optical upper limits
  80. GRB 100816A: 10.4-m GTC redshift confirmation
  81. GRB 100816A: Fermi GBM observation
  82. GRB 100816A: VLT and Gemini-N revised redshift
  83. GRB 100814A : Liverpool Telescope Observations
  84. GRB 100816A: NOT optical observations
  85. Konus-Wind observation of GRB 100814A
  86. GRB 100814A : Lulin optical observation
  87. GRB 100816A : Lulin r'-band observation
  88. GRB 100816A: Gemini-N spectroscopy
  89. GRB 100816A: Swift UVOT Observations
  90. GRB100816A Swift-XRT refined analysis
  91. GRB 100816A: Swift-BAT spectral lag results
  92. GRB 100816A, Swift-BAT refined analysis
  93. GRB 100816A: Enhanced Swift-XRT position
  94. GRB 100816A: Gemini-N imaging
  95. GRB 100816A: CQUEAN riz-band Detection, Host Galaxy?
  96. GRB100814A - interesting UVOT lightcurve.
  97. GRB 100816A: TAROT Calern observatory optical detection
  98. GRB 100816A: MASTER Optical Limits
  99. GRB100816A: TNG optical afterglow confirmation.
  100. GRB 100816A: ROTSE-III Optical Limits

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