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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"

28110 results found.

  1. GRB 101024A: Fermi GBM observation
  2. GRB101024A: Swift/UVOT
  3. GRB 101024A: Swift-BAT refined analysis
  4. GRB 101024A: Enhanced Swift-XRT position
  5. Swift/UVOT observations of GRB101023A
  6. GRB 101024A: Swift detection of a burst with an optical afterglow
  7. GGRB 101023A: GROND detection of the optical-NIR afterglow
  8. GRB 101023A: Swift-XRT Team Refined Analysis
  9. GRB 101023A: Swift-BAT refined analysis
  10. GRB 101023A: Gemini discovery of optical afterglow
  11. GRB 101023A: Enhanced Swift-XRT position
  12. GRB 101023A: REM NIR observations
  13. GRB 101023A: Swift detection of a burst
  14. GRB 101020A, Swift-BAT refined analysis
  15. GRB 101017A: Swift XRT refined analysis
  16. GRB 101017A: Swift/UVOT Observations
  17. GRB 101008A: optical observations
  18. GRB101017A: MITSuME Okayama optical upper limits
  19. GRB 101017A: Enhanced Swift-XRT position
  20. GRB 101017A: Swift-BAT refined analysis
  21. GRB 101017A: Swift detection of a burst with optical counterpart
  22. GRB 101014A: Fermi GBM detection
  23. GRB 100906A: D50 optical detection
  24. GRB 100902A: D50 optical limit
  25. GRB 101011A: Swift/UVOT observations
  26. GRB 101011A, GROND upper limits
  27. GRB 101011A: Zadko observatory - Gingin optical observations
  28. GRB 101011A: XRT Refined Analysis
  29. GRB 101011A: Swift/UVOT Observations of a Possible Optical Afterglow
  30. GRB 101011A: Enhanced Swift-XRT position
  31. GRB 101011A: Swift-BAT refined analysis
  32. GRB 101011A: Swift detection of a burst
  33. GRB 101008A: Swift-BAT refined analysis
  34. GRB101008A, GROND detection of a fading afterglow
  35. GRB 101008A: Swift-XRT refined analysis
  36. GRB 101008A: SAO RAS optical observations
  37. GRB 100915 optical upper limit
  38. GRB 101008: Swift/UVOT Upper Limits
  39. GRB 101008A: Enhanced Swift-XRT position
  40. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  41. GRB 101008A: Swift detection of a burst
  42. Refined analysis shows Swift Trigger 435520 is not a GRB
  43. Swift Trigger 435520 is probably not a GRB
  44. GRB 100925A / MAXI J1659-152: MASTER optical observations
  45. GRB 100924A: Suzaku WAM observation of the prompt emission
  46. GRB 100928A, Swift-BAT refined analysis
  47. GRB 100924A: Fermi GBM observation
  48. GRB 100928A: Swift detection of a burst
  49. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  50. GRB 100925A / MAXI J1659-152: SARA-S Observations
  51. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  52. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  53. GRB 100925A/MAXI J1659-152 - NOT optical observations
  54. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  55. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  56. GRB100925A UVOT afterglow
  57. GRB 100924A: GROND detection of an optical/NIR afterglow
  58. GRB 100925A: Swift detection of a burst
  59. GRB 100924A: Swift-BAT refined analysis
  60. GRB 100917A: TAROT La Silla observatory optical observations
  61. GRB 100915A: TAROT Calern observatory optical observations
  62. GRB100906A: Ashra-1 observation of early optical emission
  63. GRB 100916A: Fermi GBM detection
  64. GRB 100917A: Swift-BAT refined analysis
  65. GRB 100917A: Swift detection of a burst
  66. GRB100915A: MITSuME Ishigakijima Optical upper limits
  67. GRB 100915B: GRT Optical Observation
  68. GRB 100915A: GRT Optical Observation
  69. GRB 100915B: Fermi GBM observation
  70. GRB 100915A: Correction to Swift-BAT refined analysis
  71. GRB 100915A: Swift/UVOT Upper Limits
  72. GRB 100915A: Swift-BAT refined analysis
  73. GRB 100915A: Swift-XRT refined analysis
  74. GRB 100915A: Enhanced Swift-XRT position
  75. GRB 100915B: a long GRB detected by INTEGRAL
  76. GRB 100915A: Swift detection of a likely burst
  77. GRB 100910A: Fermi GBM detection
  78. Swift BAT Trigger 433953 probably not a GRB
  79. GRB100909A: MITSuME Ishigakijima Optical upper limits
  80. GRB 100909A: Swift/UVOT observations
  81. GRB 100901A: errata of GRB name in GCN 11270
  82. GRB 100909A: Swift-XRT refined analysis
  83. GRB 100906A: optical observations at Mt.Terskol
  84. GRB 100901A: optical observation in Maidanak, break confirmation
  85. GRB 100909A: Faulkes Telescope North afterglow candidate
  86. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  87. GRB 100909A: Swift target of opportunity observation
  88. GRB100906A: detection at 15GHz
  89. GRB100901A: IAO optical upper limits at 4 days after the burst
  90. GRB100906A: R band observations
  91. GRB100906A: non-detection at 15GHz
  92. GRB100906A: Optical observations at IAO
  93. GRB 100906A: Fermi GBM observation
  94. GRB 100906A: Swift-XRT refined analysis
  95. GRB 100906A: Enhanced Swift-XRT position
  96. GRB 100906A: Swift/UVOT Observations
  97. GRB100906A: MITSuME Okayama Optical Observation
  98. GRB 100905A: Swift/UVOT Upper Limits
  99. GRB 100901A: TLS observations, SDSS calibration, decay slope
  100. GRB 100906A: MASTER preliminary prompt+afterglow lc

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