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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"

28280 results found.

  1. GRB 101011A: Swift-BAT refined analysis
  2. GRB 101011A: Swift detection of a burst
  3. GRB 101008A: Swift-BAT refined analysis
  4. GRB101008A, GROND detection of a fading afterglow
  5. GRB 101008A: Swift-XRT refined analysis
  6. GRB 101008A: SAO RAS optical observations
  7. GRB 100915 optical upper limit
  8. GRB 101008: Swift/UVOT Upper Limits
  9. GRB 101008A: Enhanced Swift-XRT position
  10. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  11. GRB 101008A: Swift detection of a burst
  12. Refined analysis shows Swift Trigger 435520 is not a GRB
  13. Swift Trigger 435520 is probably not a GRB
  14. GRB 100925A / MAXI J1659-152: MASTER optical observations
  15. GRB 100924A: Suzaku WAM observation of the prompt emission
  16. GRB 100928A, Swift-BAT refined analysis
  17. GRB 100924A: Fermi GBM observation
  18. GRB 100928A: Swift detection of a burst
  19. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  20. GRB 100925A / MAXI J1659-152: SARA-S Observations
  21. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  22. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  23. GRB 100925A/MAXI J1659-152 - NOT optical observations
  24. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  25. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  26. GRB100925A UVOT afterglow
  27. GRB 100924A: GROND detection of an optical/NIR afterglow
  28. GRB 100925A: Swift detection of a burst
  29. GRB 100924A: Swift-BAT refined analysis
  30. GRB 100917A: TAROT La Silla observatory optical observations
  31. GRB 100915A: TAROT Calern observatory optical observations
  32. GRB100906A: Ashra-1 observation of early optical emission
  33. GRB 100916A: Fermi GBM detection
  34. GRB 100917A: Swift-BAT refined analysis
  35. GRB 100917A: Swift detection of a burst
  36. GRB100915A: MITSuME Ishigakijima Optical upper limits
  37. GRB 100915B: GRT Optical Observation
  38. GRB 100915A: GRT Optical Observation
  39. GRB 100915B: Fermi GBM observation
  40. GRB 100915A: Correction to Swift-BAT refined analysis
  41. GRB 100915A: Swift/UVOT Upper Limits
  42. GRB 100915A: Swift-BAT refined analysis
  43. GRB 100915A: Swift-XRT refined analysis
  44. GRB 100915A: Enhanced Swift-XRT position
  45. GRB 100915B: a long GRB detected by INTEGRAL
  46. GRB 100915A: Swift detection of a likely burst
  47. GRB 100910A: Fermi GBM detection
  48. Swift BAT Trigger 433953 probably not a GRB
  49. GRB100909A: MITSuME Ishigakijima Optical upper limits
  50. GRB 100909A: Swift/UVOT observations
  51. GRB 100901A: errata of GRB name in GCN 11270
  52. GRB 100909A: Swift-XRT refined analysis
  53. GRB 100906A: optical observations at Mt.Terskol
  54. GRB 100901A: optical observation in Maidanak, break confirmation
  55. GRB 100909A: Faulkes Telescope North afterglow candidate
  56. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  57. GRB 100909A: Swift target of opportunity observation
  58. GRB100906A: detection at 15GHz
  59. GRB100901A: IAO optical upper limits at 4 days after the burst
  60. GRB100906A: R band observations
  61. GRB100906A: non-detection at 15GHz
  62. GRB100906A: Optical observations at IAO
  63. GRB 100906A: Fermi GBM observation
  64. GRB 100906A: Swift-XRT refined analysis
  65. GRB 100906A: Enhanced Swift-XRT position
  66. GRB 100906A: Swift/UVOT Observations
  67. GRB100906A: MITSuME Okayama Optical Observation
  68. GRB 100905A: Swift/UVOT Upper Limits
  69. GRB 100901A: TLS observations, SDSS calibration, decay slope
  70. GRB 100906A: MASTER preliminary prompt+afterglow lc
  71. GRB 100906A: Swift-BAT refined analysis
  72. GRB 100906A: Swift detection of a burst with an optical afterglow
  73. GRB 100829A: MASTER optical observations
  74. GRB100905A: Optical upper limits at IAO
  75. GRB100905A: MITSuME Okayama optical upper limits
  76. GRB 100905A: Swift-XRT refined analysis.
  77. GRB100905A: 1.5m OSN upper limit
  78. GRB 100905A: Enhanced Swift-XRT position
  79. GRB 100905A: Swift-BAT refined analysis
  80. GRB 100905A: Faulkes Telescope North observations
  81. GRB 100905A: Swift detection of a burst
  82. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  83. GRB 100901A: Submm observations from SMA
  84. GRB 100904A: Swift-BAT refined analysis
  85. GRB100902A: Optical upper limits at IAO
  86. GRB10901A: Optical observations at IAO
  87. GRB 100902A: Swift-BAT refined analysis
  88. IPN Triangulation of the very bright GRB 100829A
  89. GRB 100902A: Swift XRT refined analysis
  90. GRB 100902A: Swift/UVOT Upper Limits
  91. GRB 100902A: optical observation at Mt.Terskol
  92. GRB 100901A: optical observation at Mt.Terskol
  93. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  94. GRB 100902A: Enhanced Swift-XRT position
  95. GRB 100901A: TLS Observations: Break?
  96. GRB 100901A: ISON-NM optical observations
  97. GRB 100902A: Faulkes Telescope South observations
  98. GRB 100902A: Swift detection of a burst
  99. GRB 100901A: Vega telescope optical afterglow observation
  100. Swift/UVOT Observations of GRB100901A

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