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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"

28271 results found.

  1. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  2. GRB 101008A: Swift detection of a burst
  3. Refined analysis shows Swift Trigger 435520 is not a GRB
  4. Swift Trigger 435520 is probably not a GRB
  5. GRB 100925A / MAXI J1659-152: MASTER optical observations
  6. GRB 100924A: Suzaku WAM observation of the prompt emission
  7. GRB 100928A, Swift-BAT refined analysis
  8. GRB 100924A: Fermi GBM observation
  9. GRB 100928A: Swift detection of a burst
  10. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  11. GRB 100925A / MAXI J1659-152: SARA-S Observations
  12. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  13. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  14. GRB 100925A/MAXI J1659-152 - NOT optical observations
  15. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  16. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  17. GRB100925A UVOT afterglow
  18. GRB 100924A: GROND detection of an optical/NIR afterglow
  19. GRB 100925A: Swift detection of a burst
  20. GRB 100924A: Swift-BAT refined analysis
  21. GRB 100917A: TAROT La Silla observatory optical observations
  22. GRB 100915A: TAROT Calern observatory optical observations
  23. GRB100906A: Ashra-1 observation of early optical emission
  24. GRB 100916A: Fermi GBM detection
  25. GRB 100917A: Swift-BAT refined analysis
  26. GRB 100917A: Swift detection of a burst
  27. GRB100915A: MITSuME Ishigakijima Optical upper limits
  28. GRB 100915B: GRT Optical Observation
  29. GRB 100915A: GRT Optical Observation
  30. GRB 100915B: Fermi GBM observation
  31. GRB 100915A: Correction to Swift-BAT refined analysis
  32. GRB 100915A: Swift/UVOT Upper Limits
  33. GRB 100915A: Swift-BAT refined analysis
  34. GRB 100915A: Swift-XRT refined analysis
  35. GRB 100915A: Enhanced Swift-XRT position
  36. GRB 100915B: a long GRB detected by INTEGRAL
  37. GRB 100915A: Swift detection of a likely burst
  38. GRB 100910A: Fermi GBM detection
  39. Swift BAT Trigger 433953 probably not a GRB
  40. GRB100909A: MITSuME Ishigakijima Optical upper limits
  41. GRB 100909A: Swift/UVOT observations
  42. GRB 100901A: errata of GRB name in GCN 11270
  43. GRB 100909A: Swift-XRT refined analysis
  44. GRB 100906A: optical observations at Mt.Terskol
  45. GRB 100901A: optical observation in Maidanak, break confirmation
  46. GRB 100909A: Faulkes Telescope North afterglow candidate
  47. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  48. GRB 100909A: Swift target of opportunity observation
  49. GRB100906A: detection at 15GHz
  50. GRB100901A: IAO optical upper limits at 4 days after the burst
  51. GRB100906A: R band observations
  52. GRB100906A: non-detection at 15GHz
  53. GRB100906A: Optical observations at IAO
  54. GRB 100906A: Fermi GBM observation
  55. GRB 100906A: Swift-XRT refined analysis
  56. GRB 100906A: Enhanced Swift-XRT position
  57. GRB 100906A: Swift/UVOT Observations
  58. GRB100906A: MITSuME Okayama Optical Observation
  59. GRB 100905A: Swift/UVOT Upper Limits
  60. GRB 100901A: TLS observations, SDSS calibration, decay slope
  61. GRB 100906A: MASTER preliminary prompt+afterglow lc
  62. GRB 100906A: Swift-BAT refined analysis
  63. GRB 100906A: Swift detection of a burst with an optical afterglow
  64. GRB 100829A: MASTER optical observations
  65. GRB100905A: Optical upper limits at IAO
  66. GRB100905A: MITSuME Okayama optical upper limits
  67. GRB 100905A: Swift-XRT refined analysis.
  68. GRB100905A: 1.5m OSN upper limit
  69. GRB 100905A: Enhanced Swift-XRT position
  70. GRB 100905A: Swift-BAT refined analysis
  71. GRB 100905A: Faulkes Telescope North observations
  72. GRB 100905A: Swift detection of a burst
  73. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  74. GRB 100901A: Submm observations from SMA
  75. GRB 100904A: Swift-BAT refined analysis
  76. GRB100902A: Optical upper limits at IAO
  77. GRB10901A: Optical observations at IAO
  78. GRB 100902A: Swift-BAT refined analysis
  79. IPN Triangulation of the very bright GRB 100829A
  80. GRB 100902A: Swift XRT refined analysis
  81. GRB 100902A: Swift/UVOT Upper Limits
  82. GRB 100902A: optical observation at Mt.Terskol
  83. GRB 100901A: optical observation at Mt.Terskol
  84. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  85. GRB 100902A: Enhanced Swift-XRT position
  86. GRB 100901A: TLS Observations: Break?
  87. GRB 100901A: ISON-NM optical observations
  88. GRB 100902A: Faulkes Telescope South 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. GRB 100901A: THO optical observations
  94. GRB100901A: MITSuME Okayama Optical Observation
  95. GRB 100901A: Swift-XRT Team refined analysis
  96. GRB 100901A - NOT optical observation
  97. GRB 100901A: Swift-BAT refined analysis
  98. GRB 100901A: Enhanced Swift-XRT position
  99. GRB 100901A: Swift detection of a burst with an optical afterglow
  100. GRB 100829.9: MASTER Optical Limits

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