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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"

28261 results found.

  1. GRB 100925A / MAXI J1659-152: SARA-S Observations
  2. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  3. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  4. GRB 100925A/MAXI J1659-152 - NOT optical observations
  5. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  6. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  7. GRB100925A UVOT afterglow
  8. GRB 100924A: GROND detection of an optical/NIR afterglow
  9. GRB 100925A: Swift detection of a burst
  10. GRB 100924A: Swift-BAT refined analysis
  11. GRB 100917A: TAROT La Silla observatory optical observations
  12. GRB 100915A: TAROT Calern observatory optical observations
  13. GRB100906A: Ashra-1 observation of early optical emission
  14. GRB 100916A: Fermi GBM detection
  15. GRB 100917A: Swift-BAT refined analysis
  16. GRB 100917A: Swift detection of a burst
  17. GRB100915A: MITSuME Ishigakijima Optical upper limits
  18. GRB 100915B: GRT Optical Observation
  19. GRB 100915A: GRT Optical Observation
  20. GRB 100915B: Fermi GBM observation
  21. GRB 100915A: Correction to Swift-BAT refined analysis
  22. GRB 100915A: Swift/UVOT Upper Limits
  23. GRB 100915A: Swift-BAT refined analysis
  24. GRB 100915A: Swift-XRT refined analysis
  25. GRB 100915A: Enhanced Swift-XRT position
  26. GRB 100915B: a long GRB detected by INTEGRAL
  27. GRB 100915A: Swift detection of a likely burst
  28. GRB 100910A: Fermi GBM detection
  29. Swift BAT Trigger 433953 probably not a GRB
  30. GRB100909A: MITSuME Ishigakijima Optical upper limits
  31. GRB 100909A: Swift/UVOT observations
  32. GRB 100901A: errata of GRB name in GCN 11270
  33. GRB 100909A: Swift-XRT refined analysis
  34. GRB 100906A: optical observations at Mt.Terskol
  35. GRB 100901A: optical observation in Maidanak, break confirmation
  36. GRB 100909A: Faulkes Telescope North afterglow candidate
  37. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  38. GRB 100909A: Swift target of opportunity observation
  39. GRB100906A: detection at 15GHz
  40. GRB100901A: IAO optical upper limits at 4 days after the burst
  41. GRB100906A: R band observations
  42. GRB100906A: non-detection at 15GHz
  43. GRB100906A: Optical observations at IAO
  44. GRB 100906A: Fermi GBM observation
  45. GRB 100906A: Swift-XRT refined analysis
  46. GRB 100906A: Enhanced Swift-XRT position
  47. GRB 100906A: Swift/UVOT Observations
  48. GRB100906A: MITSuME Okayama Optical Observation
  49. GRB 100905A: Swift/UVOT Upper Limits
  50. GRB 100901A: TLS observations, SDSS calibration, decay slope
  51. GRB 100906A: MASTER preliminary prompt+afterglow lc
  52. GRB 100906A: Swift-BAT refined analysis
  53. GRB 100906A: Swift detection of a burst with an optical afterglow
  54. GRB 100829A: MASTER optical observations
  55. GRB100905A: Optical upper limits at IAO
  56. GRB100905A: MITSuME Okayama optical upper limits
  57. GRB 100905A: Swift-XRT refined analysis.
  58. GRB100905A: 1.5m OSN upper limit
  59. GRB 100905A: Enhanced Swift-XRT position
  60. GRB 100905A: Swift-BAT refined analysis
  61. GRB 100905A: Faulkes Telescope North observations
  62. GRB 100905A: Swift detection of a burst
  63. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  64. GRB 100901A: Submm observations from SMA
  65. GRB 100904A: Swift-BAT refined analysis
  66. GRB100902A: Optical upper limits at IAO
  67. GRB10901A: Optical observations at IAO
  68. GRB 100902A: Swift-BAT refined analysis
  69. IPN Triangulation of the very bright GRB 100829A
  70. GRB 100902A: Swift XRT refined analysis
  71. GRB 100902A: Swift/UVOT Upper Limits
  72. GRB 100902A: optical observation at Mt.Terskol
  73. GRB 100901A: optical observation at Mt.Terskol
  74. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  75. GRB 100902A: Enhanced Swift-XRT position
  76. GRB 100901A: TLS Observations: Break?
  77. GRB 100901A: ISON-NM optical observations
  78. GRB 100902A: Faulkes Telescope South observations
  79. GRB 100902A: Swift detection of a burst
  80. GRB 100901A: Vega telescope optical afterglow observation
  81. Swift/UVOT Observations of GRB100901A
  82. GRB 100901A: SARA-N observations
  83. GRB 100901A: THO optical observations
  84. GRB100901A: MITSuME Okayama Optical Observation
  85. GRB 100901A: Swift-XRT Team refined analysis
  86. GRB 100901A - NOT optical observation
  87. GRB 100901A: Swift-BAT refined analysis
  88. GRB 100901A: Enhanced Swift-XRT position
  89. GRB 100901A: Swift detection of a burst with an optical afterglow
  90. GRB 100829.9: MASTER Optical Limits
  91. GRB 100823A: optical upper limit
  92. GRB 100814A: Maidanak optical observations
  93. GRB 100823A: optical observations
  94. GRB 100725B: Mondy optical upper limit
  95. GRB 100725B: Maidanak optical upper limit
  96. GRB100807A: R band observations
  97. GRB 100823A: Swift XRT refined analysis
  98. GRB 100823A - second epoch WHT observations
  99. GRB 100823A: TNG NIR observations
  100. GRB 100823A: Swift/UVOT Upper Limits

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