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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"

11556 results found.

  1. GRB 210421B: Swift/BAT-GUANO detection and arcminute localization
  2. Fermi GRB 210421C: Global MASTER-Net observations report
  3. GRB 210421C: Fermi GBM Final Real-time Localization
  4. GRB 210421B: Fermi GBM Final Localization
  5. Fermi trigger No 640695289: Global MASTER-Net observations report
  6. GRB 210413B: MITSuME Okayama optical upper limits
  7. Fermi GRB 210420A: Global MASTER-Net observations report
  8. GRB 210420A: Fermi GBM Final Real-time Localization
  9. Fermi GRB 210419B: Global MASTER-Net observations report
  10. GRB 210419B: Fermi GBM Final Real-time Localization
  11. Fermi GBM trigger 640353092/210417494 is not a GRB
  12. Fermi Gamma-ray Burst Monitor trigger 640303939/210416925 is not a GRB
  13. GRB 210413B: Swift/BAT detection and probable localization of a short burst
  14. GRB 210411B: AstroSat CZTI detection
  15. GRB 210410A: AstroSat CZTI detection
  16. GRB 210410A: A twin of short GRB 090510 with complementary observations
  17. Fermi GRB 210415A: Global MASTER-Net observations report
  18. GRB 210415A: Fermi GBM Final Real-time Localization
  19. GRB 210410A: MITSuME Akeno optical upper limits
  20. Fermi GRB 210411B: Global MASTER-Net observations report
  21. Konus-Wind detection of GRB 210410A
  22. GRB 210411D: BALROG localization (Fermi Trigger 639851475 / GRB 210411688)
  23. GRB 210411D: Fermi GBM Final Real-time Localization
  24. GRB 210411B: Fermi GBM Final Real-time Localization
  25. Fermi GRB 210411A: Global MASTER-Net observations report
  26. GRB 210411A: Fermi GBM Final Real-time Localization
  27. GRB 210410A: Fermi GBM detection
  28. GRB 210410A: Swift/UVOT Upper Limits
  29. GRB210410A: Joint inspection of RATIR and D50 data
  30. GRB 210410A: RATIR Optical and NIR Observations
  31. GRB 210410A: AGILE detection of a burst
  32. GRB 210410A: Fermi-LAT detection
  33. GRB210410A: Candidate optical afterglow by Ondrejov D50
  34. Fermi GRB 210410A: Global MASTER-Net observations report
  35. GRB 210410A: Swift XRT localization
  36. GRB 210410A: Fermi GBM Final Real-time Localization
  37. GRB 210406B: Fermi GBM detection
  38. Konus-Wind detection of GRB 210406A
  39. GRB 210406A: Fermi GBM detection
  40. GRB 210402A: MASTER prompt and follow up optical observation
  41. GRB 210402A: Fermi GBM detection
  42. GRB 210404.141: DDOTI Upper Limits
  43. GRB 210401A: GECAM detection
  44. Fermi trigger No 639199407: Global MASTER-Net observations report
  45. GRB 210402A: Montarrenti Observatory upper limit
  46. GRB 210328A: AstroSat CZTI detection
  47. Konus-Wind detection of GRB 210401A
  48. GRB 210402A: Swift detection of a burst
  49. Fermi trigger No 639093861: Global MASTER-Net observations report
  50. Fermi GRB 210401A: Global MASTER-Net observations report
  51. GRB 210401A: Fermi GBM Final Real-time Localization
  52. GRB 210328A: GECAM detection
  53. GRB 210324A: AstroSat CZTI detection
  54. GRB 210324C: AstroSat CZTI detection
  55. GRB 210328A: BALROG localization (Fermi Trigger / GRB 210328865)
  56. GRB 210328A: Fermi GBM Final Real-time Localization
  57. GRB 210326A: Insight-HXMT/HE detection
  58. GRB 210326A: Fermi GBM Final Localization
  59. Fermi trigger No 638414549: Global MASTER-Net observations report
  60. IPN triangulation of GRB 210324C
  61. GRB 210323A: Insight-HXMT/HE detection
  62. Fermi GRB 210324C: Global MASTER-Net observations report
  63. Fermi GRB 210324B: Global MASTER-Net observations report
  64. GRB 210323A: Gemini-North Optical Source Detection
  65. GRB 210324C: BALROG localization (Fermi Trigger 638308803 / GRB 210324833)
  66. GRB 210324C: Fermi GBM Final Real-time Localization
  67. Short GRB 210323A: GTC Observations
  68. GRB 210324B: Fermi GBM Final Real-time Localization
  69. Konus-Wind detection of GRB 210323A (short)
  70. GRB 210323A: Classification and redshift estimation
  71. GRB 210323A: Kitab optical upper limit
  72. GRB 210323A: Fermi GBM detection
  73. GRB 210324A: Fermi GBM Final Real-time Localization
  74. GRB 210323B: Swift/BAT-GUANO detection and possible arcminute localization
  75. Fermi GBM trigger 637977270/210320996 is not a GRB
  76. GRB 200524A: Redshift from Gemini-North
  77. GRB 210318B: Fermi GBM detection
  78. Fermi trigger No 637729731: Global MASTER-Net observations report
  79. Fermi GRB 210317A: Global MASTER-Net observations report
  80. GRB 210317A: GECAM detection
  81. GRB 210317A: Fermi GBM Final Real-time Localization
  82. Fermi trigger No 637521056: Global MASTER-Net observations report
  83. Fermi GRB 210312A: Global MASTER-Net observations report
  84. GRB 210312A: Fermi GBM Final Real-time Localization
  85. Konus-Wind detection of GRB 210308A
  86. Konus-Wind detection of GRB 210306A
  87. Konus-Wind detection of GRB 210305A
  88. Fermi trigger No 637027080: Global MASTER-Net observations report
  89. GRB 210306B: Fermi GBM detection
  90. Fermi trigger No 636926765: Global MASTER-Net observations report
  91. GRB 210305A: Fermi GBM observation
  92. GRB 210308A: Fermi GBM detection
  93. GRB 210306A: Fermi GBM observation
  94. GRB 210306A: Fermi-LAT detection
  95. GRB 210228B: Insight-HXMT/HE detection
  96. Fermi trigger No 636459103: Global MASTER-Net observations report
  97. Fermi trigger No 636187116: Global MASTER-Net observations report
  98. GRB 210228A: GECAM detection
  99. Fermi trigger No 636168178: Global MASTER-Net observations report
  100. GRB 210225A: Insight-HXMT/HE detection

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