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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"

36143 results found.

  1. GRB 090111, the review of the sky area in plate archives (1976-1996)
  2. Konus-Wind observation of GRB 101023A
  3. GRB 101024A: GROND optical/NIR observations
  4. GRB 101024A: Zadko observatory - Gingin. Optical observations refined analysis
  5. GRB 101024A: Swift XRT refined analysis
  6. GRB 101024A: Zadko observatory - Gingin. Optical observations
  7. GRB 101023A: miniTAO/ANIR NIR detection
  8. GRB 101024A: Fermi GBM observation
  9. GRB 101023A: Fermi GBM observation
  10. GRB101024A: Swift/UVOT
  11. GRB 101024A: Swift-BAT refined analysis
  12. GRB 101024A: GRAS06 optical observations
  13. GRB 101024A: Enhanced Swift-XRT position
  14. Swift/UVOT observations of GRB101023A
  15. GRB 101024A: Swift detection of a burst with an optical afterglow
  16. GGRB 101023A: GROND detection of the optical-NIR afterglow
  17. GRB 101023A: Swift-XRT Team Refined Analysis
  18. GRB 101023A: Swift-BAT refined analysis
  19. GRB 101023A: Gemini discovery of optical afterglow
  20. GRB 101023A: Enhanced Swift-XRT position
  21. GRB 101023A: REM NIR observations
  22. GRB 101023A: Swift detection of a burst
  23. GRB 101011A: miniTAO/ANIR NIR upper limits
  24. GRB 101020A: MASTER prompt and afterglow limit
  25. GRB 101020A: BOOTES2 follow-up and limit
  26. GRB 101020A: MASTER polarization optical observations
  27. GRB 101020A, Swift-BAT refined analysis
  28. GRB 101020A: Swift detection of a burst
  29. GRB 101017A: miniTAO/ANIR NIR upper limits
  30. GRB 101017A: Swift XRT refined analysis
  31. GRB 101017A: Swift/UVOT Observations
  32. GRB 101008A: correction to the GCN 11352
  33. GRB 101008A: optical observations
  34. GRB101017A: MITSuME Okayama optical upper limits
  35. Konus-Wind observation of GRB 101017A
  36. GRB 101014A: Fermi LAT detection
  37. GRB 101017A: Enhanced Swift-XRT position
  38. GRB 101017A: Swift-BAT refined analysis
  39. GRB 101017A: ROTSE-III Optical Limits
  40. GRB 101017A: Swift detection of a burst with optical counterpart
  41. GRB 101011A: Fermi GBM detection
  42. GRB 101011A: BOOTES-3 Upper Limit
  43. Konus-Wind observation of GRB 101014A
  44. GRB 101014A: Fermi GBM detection
  45. GRB 100906A: D50 optical detection
  46. GRB 100902A: D50 optical limit
  47. GRB 101011A: Swift/UVOT observations
  48. GRB 101011A, GROND upper limits
  49. GRB 101011A: Zadko observatory - Gingin optical observations
  50. GRB 101011A: XRT Refined Analysis
  51. GRB 101011A: Swift/UVOT Observations of a Possible Optical Afterglow
  52. GRB 101011A: Enhanced Swift-XRT position
  53. GRB 101011A: Swift-BAT refined analysis
  54. GRB 101011A: Swift detection of a burst
  55. GRB 101008A: Fermi GBM observation
  56. GRB 101008A: MASTER prompt optical observations (correction to GCN#11328)
  57. GRB 101008A: MASTER prompt optical observations
  58. GRB 101008A: Swift-BAT refined analysis
  59. GRB101008A, GROND detection of a fading afterglow
  60. GRB 101008A: Swift-XRT refined analysis
  61. GRB 101008A: SAO RAS optical observations
  62. GRB 100915 optical upper limit
  63. GRB 101008: Swift/UVOT Upper Limits
  64. GRB 101008A: Enhanced Swift-XRT position
  65. GRB 101008A: 1.23m CAHA optical observations
  66. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  67. GRB 101008A: Swift detection of a burst
  68. GRB 100728B: X-shooter redshift
  69. Refined analysis shows Swift Trigger 435520 is not a GRB
  70. Swift Trigger 435520 is probably not a GRB
  71. GRB 100925A / MAXI J1659-152: MASTER optical observations
  72. GRB 100924A: Suzaku WAM observation of the prompt emission
  73. GRB 100928A, Swift-BAT refined analysis
  74. GRB 100924A: Fermi GBM observation
  75. GRB 100928A: Swift detection of a burst
  76. GRB 100925A / MAXI J1659-152: WSRT Radio and Polarization Detection
  77. GRB 100925A / MAXI J1659-152: Optical observation with the Kottamia 188cm telescope
  78. GRB100925A/MAXI J1659-152: X-shooter identification as an X-ray binary
  79. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  80. GRB 100925A / MAXI J1659-152: SARA-S Observations
  81. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  82. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  83. GRB 100925A/MAXI J1659-152 - NOT optical observations
  84. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  85. MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)
  86. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  87. GRB 100924A: GROND detection of an optical/NIR afterglow
  88. GRB 100925A: Swift detection of a burst
  89. GRB 100924A: Swift-BAT refined analysis
  90. GRB 100924A: Swift detection of a burst
  91. GRB 100917A: TAROT La Silla observatory optical observations
  92. GRB 100915A: TAROT Calern observatory optical observations
  93. GRB100906A: Ashra-1 observation of early optical emission
  94. GRB 100916A: Fermi GBM detection
  95. GRB 100917A: Swift-BAT refined analysis
  96. GRB 100917A: Swift detection of a burst
  97. GRB100915A: MITSuME Ishigakijima Optical upper limits
  98. GRB 100915B: GRT Optical Observation
  99. GRB 100915A: GRT Optical Observation
  100. GRB 100915B: Fermi GBM observation

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