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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"

23561 results found.

  1. GRB 100909A: ROTSE-III Optical Limits
  2. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  3. GRB 100909A: Swift target of opportunity observation
  4. GRB100906A: detection at 15GHz
  5. GRB100901A: IAO optical upper limits at 4 days after the burst
  6. GRB 100901A: CrAO optical observations
  7. GRB100906A: R band observations
  8. GRB100906A: non-detection at 15GHz
  9. GRB100906A: Optical observations at IAO
  10. GRB 100901A: TLS Detection at 5.5 days
  11. GRB 100906A: Swift-XRT refined analysis
  12. GRB 100906A: Enhanced Swift-XRT position
  13. GRB 100906A: Swift/UVOT Observations
  14. GRB100906A: MITSuME Okayama Optical Observation
  15. GRB 100906A: TLS Multicolor Observations
  16. GRB 100905A: Swift/UVOT Upper Limits
  17. GRB 100906A: Swift detection of a burst with an optical afterglow
  18. GRB 100829A: MASTER optical observations
  19. GRB100905A: Optical upper limits at IAO
  20. GRB100905A: MITSuME Okayama optical upper limits
  21. GRB 100905A: Swift-XRT refined analysis.
  22. GRB 100905A: UKIRT zJHK Observation
  23. GRB 100901A: Possible WSRT Radio Detection
  24. GRB100905A: 1.5m OSN upper limit
  25. GRB 100905A: Enhanced Swift-XRT position
  26. GRB 100905A: Swift-BAT refined analysis
  27. GRB100904A: BOOTES-3 Upper Limit
  28. GRB 100905A: Swift detection of a burst
  29. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  30. GRB 100901A: Submm observations from SMA
  31. GRB 100902A: UKIRT JK Observation
  32. GRB 100904A: Swift-BAT refined analysis
  33. GRB100902A: Optical upper limits at IAO
  34. GRB10901A: Optical observations at IAO
  35. GRB 100904A: Swift detection of a burst
  36. IPN Triangulation of the very bright GRB 100829A
  37. GRB 100901A: Lightbuckets Optical Observations
  38. GRB 100902A: 1.5m OSN I-band Upper Limits
  39. GRB 100902A: Swift/UVOT Upper Limits
  40. GRB 100902A: optical observation at Mt.Terskol
  41. GRB 100901A: optical observation at Mt.Terskol
  42. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  43. GRB 100902A: Enhanced Swift-XRT position
  44. GRB 100901A: ISON-NM optical observations
  45. GRB 100902A: Swift detection of a burst
  46. GRB 100901A: Vega telescope optical afterglow observation
  47. Swift/UVOT Observations of GRB100901A
  48. GRB 100901A: SARA-N observations
  49. GRB100901A: MITSuME Okayama Optical Observation
  50. GRB 100901A - NOT optical observation
  51. GRB 100901A: Enhanced Swift-XRT position
  52. GRB 100901A: Swift detection of a burst with an optical afterglow
  53. GRB 100829.9: MASTER Optical Limits
  54. IPN triangulation of GRB 100826A
  55. GRB 100823A: optical upper limit
  56. GRB 100814A: Maidanak optical observations
  57. GRB 100823A: optical observations
  58. GRB 100725B: Mondy optical upper limit
  59. GRB 100725B: Maidanak optical upper limit
  60. GRB100807A: R band observations
  61. GRB 100823A - second epoch WHT observations
  62. GRB 100823A: TNG NIR observations
  63. GRB 100823A: Swift/UVOT Upper Limits
  64. GRB 100823A: WHT observations
  65. GRB 100823A: Enhanced Swift-XRT position
  66. GRB 100823A: Swift detection of a burst
  67. GRB 100814B: Fermi GBM detection
  68. GRB 100814A: optical observations
  69. GRB100816A: MITSuME optical upper limits
  70. GRB 100814A: NOT optical observations
  71. GRB 100816A: NOT optical observations
  72. GRB 100814A : Lulin optical observation
  73. GRB 100816A : Lulin r'-band observation
  74. GRB 100816A: Swift UVOT Observations
  75. GRB100816A Swift-XRT refined analysis
  76. GRB 100816A: Swift-BAT spectral lag results
  77. GRB 100816A: 1.23m CAHA optical observations
  78. GRB 100816A: Enhanced Swift-XRT position
  79. GRB 100816A: Gemini-N imaging
  80. GRB 100816A: TAROT Calern observatory optical detection
  81. GRB 100816A: MASTER Optical Limits
  82. GRB100816A: TNG optical afterglow confirmation.
  83. GRB 100816A: ROTSE-III Optical Limits
  84. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  85. GRB 100814A: Submm observations from APEX
  86. Swift/UVOT Observations of GRB100814A - a clearer table.
  87. Swift/UVOT observations of GRB100814A
  88. GRB 100814A, Swift-BAT refined analysis
  89. GRB 100814A: Enhanced Swift-XRT position
  90. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  91. GRB 100814A: Swift detection of a burst with an optical afterglow
  92. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  93. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  94. GRB 100802A: further NOT observation
  95. GRB 100807A: P200 Infrared Observations
  96. GRB 100805A: the 3-rd epoch of SAO RAS optical observations
  97. GRB100807A: optical observation in CrAO
  98. GRB 100805A: optical observation in CrAO
  99. GRB 100805A: 2-nd epoch of SAO RAS optical observations
  100. GRB100807A: MITSuME optical upper limits

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