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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"

21792 results found.

  1. GRB 101023A: Swift detection of a burst
  2. GRB 101020A, Swift-BAT refined analysis
  3. GRB 101017A: Swift/UVOT Observations
  4. GRB 101008A: optical observations
  5. GRB101017A: MITSuME Okayama optical upper limits
  6. Konus-Wind observation of GRB 101017A
  7. GRB 101017A: Enhanced Swift-XRT position
  8. GRB 101017A: Swift-BAT refined analysis
  9. GRB 101017A: ROTSE-III Optical Limits
  10. GRB 101017A: Swift detection of a burst with optical counterpart
  11. Konus-Wind observation of GRB 101014A
  12. GRB 100902A: D50 optical limit
  13. GRB 101011A: Swift/UVOT observations
  14. GRB 101011A, GROND upper limits
  15. GRB 101011A: Zadko observatory - Gingin optical observations
  16. GRB 101011A: Swift/UVOT Observations of a Possible Optical Afterglow
  17. GRB 101011A: Enhanced Swift-XRT position
  18. GRB 101011A: Swift detection of a burst
  19. GRB101008A, GROND detection of a fading afterglow
  20. GRB 101008A: SAO RAS optical observations
  21. GRB 100915 optical upper limit
  22. GRB 101008: Swift/UVOT Upper Limits
  23. GRB 101008A: Enhanced Swift-XRT position
  24. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  25. Swift Trigger 435520 is probably not a GRB
  26. GRB 100924A: Suzaku WAM observation of the prompt emission
  27. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  28. GRB 100925A / MAXI J1659-152: SARA-S Observations
  29. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  30. GRB 100925A/MAXI J1659-152 - NOT optical observations
  31. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  32. GRB 100924A: GROND detection of an optical/NIR afterglow
  33. GRB 100925A: Swift detection of a burst
  34. GRB 100917A: TAROT La Silla observatory optical observations
  35. GRB 100915A: TAROT Calern observatory optical observations
  36. GRB100906A: Ashra-1 observation of early optical emission
  37. GRB 100917A: Swift-BAT refined analysis
  38. GRB100915A: MITSuME Ishigakijima Optical upper limits
  39. GRB 100915B: GRT Optical Observation
  40. GRB 100915A: GRT Optical Observation
  41. GRB 100915A: Swift/UVOT Upper Limits
  42. GRB 100915A: Swift-BAT refined analysis
  43. GRB 100915A: Enhanced Swift-XRT position
  44. GRB 100915A: Swift detection of a likely burst
  45. Swift BAT Trigger 433953 probably not a GRB
  46. GRB100909A: MITSuME Ishigakijima Optical upper limits
  47. GRB 100909A: Swift/UVOT observations
  48. GRB 100901A: errata of GRB name in GCN 11270
  49. GRB 100901A: optical observations in Mondy and R-light curve
  50. GRB 100909A: Swift-XRT refined analysis
  51. GRB 100906A: optical observations at Mt.Terskol
  52. GRB 100901A: optical observation in Maidanak, break confirmation
  53. GRB 100909A: ROTSE-III Optical Limits
  54. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  55. GRB 100909A: Swift target of opportunity observation
  56. GRB100906A: detection at 15GHz
  57. GRB100901A: IAO optical upper limits at 4 days after the burst
  58. GRB 100901A: CrAO optical observations
  59. GRB100906A: R band observations
  60. Konus-Wind observation of GRB 100906A
  61. GRB100906A: non-detection at 15GHz
  62. GRB100906A: Optical observations at IAO
  63. GRB 100906A: Enhanced Swift-XRT position
  64. GRB 100906A: Swift/UVOT Observations
  65. GRB100906A: MITSuME Okayama Optical Observation
  66. GRB 100905A: Swift/UVOT Upper Limits
  67. GRB 100901A: TLS observations, SDSS calibration, decay slope
  68. GRB 100906A: Swift-BAT refined analysis
  69. GRB 100906A: Swift detection of a burst with an optical afterglow
  70. GRB 100829A: MASTER optical observations
  71. GRB100905A: Optical upper limits at IAO
  72. GRB100905A: MITSuME Okayama optical upper limits
  73. GRB100905A: 1.5m OSN upper limit
  74. GRB 100905A: Enhanced Swift-XRT position
  75. GRB 100905A: Swift detection of a burst
  76. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  77. GRB 100901A: Submm observations from SMA
  78. GRB100902A: Optical upper limits at IAO
  79. GRB10901A: Optical observations at IAO
  80. Konus-Wind observation of GRB 100829A
  81. IPN Triangulation of the very bright GRB 100829A
  82. Tentative redshift of GRB100902A from Swift-XRT data
  83. GRB 100902A: Swift/UVOT Upper Limits
  84. GRB 100902A: optical observation at Mt.Terskol
  85. GRB 100901A: optical observation at Mt.Terskol
  86. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  87. GRB 100902A: Enhanced Swift-XRT position
  88. GRB 100901A: ISON-NM optical observations
  89. GRB 100902A: Swift detection of a burst
  90. GRB 100901A: Vega telescope optical afterglow observation
  91. Swift/UVOT Observations of GRB100901A
  92. GRB 100901A: SARA-N observations
  93. GRB100901A: MITSuME Okayama Optical Observation
  94. GRB 100901A - NOT optical observation
  95. GRB 100901A: Swift-BAT refined analysis
  96. GRB 100901A: Enhanced Swift-XRT position
  97. GRB 100901A: Swift detection of a burst with an optical afterglow
  98. Konus-Wind observation of GRB 100826A
  99. GRB 100829.9: MASTER Optical Limits
  100. GRB 100823A: optical upper limit

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