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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"

36401 results found.

  1. Fermi GRB 230328A: Global MASTER-Net observations report
  2. GRB 230328A: Fermi GBM Final Real-time Localization
  3. GRB 230325A: Swift-BAT refined analysis
  4. GRB 230325A: Swift/UVOT Upper Limits
  5. GRB 230325A: X-shooter optical afterglow and redshift
  6. GRB 230325A: Swift-XRT refined Analysis
  7. GRB 230322B: Swift-BAT refined analysis
  8. GRB 230325A: Enhanced Swift-XRT position
  9. GRB 230325A: Prompt enhanced Swift-XRT position
  10. GRB 230325A: Swift detection of a burst
  11. GRB 230320B: Fermi GBM Observation
  12. GRB 230322B: Swift/UVOT Detection
  13. Konus-Wind detection of GRB 230309A
  14. Konus-Wind detection of GRB 230308A
  15. Konus-Wind detection of GRB 230304B
  16. GRB 230322B: Swift-XRT refined Analysis
  17. GRB 230322B: Enhanced Swift-XRT position
  18. Swift GRB 230322B: Global MASTER-Net observations report
  19. GRB 230322B: Swift detection of a burst with optical counterpart
  20. GRB 230322A: Fermi GBM Final Real-time Localization
  21. GRB 230320B: GRBAlpha detection
  22. GRB 230321A: CALET Gamma-Ray Burst Monitor detection
  23. GRB 230320B: CALET Gamma-Ray Burst Monitor detection
  24. GRB 230320B: Swift/BAT-GUANO detection outside the coded FOV
  25. Fermi GRB 230320A: Global MASTER-Net observations report
  26. Fermi GRB 230321A: Global MASTER-Net observations report
  27. GRB 230321B: AstroSat CZTI detection
  28. GRB 230320B: AstroSat CZTI detection
  29. GRB 230321A: BALROG localization (Fermi Trigger 701065308 / GRB 230321182)
  30. GRB 230321A: Fermi GBM Final Real-time Localization
  31. GRB 230320A: Fermi GBM Final Real-time Localization
  32. GRB 230314A: TURBO Optical Upper Limit
  33. GRB 230307A: Continued Gemini-South observations confirm rapid optical fading
  34. IPN triangulation of GRB 230309A
  35. Fermi GRB 230316A: Global MASTER-Net observations report
  36. GRB 230304D: AstroSat CZTI detection
  37. GRB 230316A: Fermi GBM Final Real-time Localization
  38. IPN triangulation of GRB 230304B
  39. GRB 230313A: AstroSat CZTI detection
  40. GRB 230307A: Far off-axis NuSTAR detection of the GRB
  41. IPN triangulation of GRB 230308A (short/bright)
  42. Fermi GRB 230314A: Global MASTER-Net observations report
  43. GRB 230307A: ATCA radio detection
  44. GRB 230314A: Fermi GBM Final Real-time Localization
  45. VZLUSAT-2 detection of SGR 1806-20
  46. GRB 230307A: INTEGRAL upper limit on Hard X-ray afterglow
  47. GRB 230307A: Swift/UVOT detection
  48. GRB 230313A: BALROG localization (Fermi Trigger 700400328 / GRB 230313485)
  49. Fermi GRB 230313A: Global MASTER-Net observations report
  50. GRB 230313A: Fermi GBM Final Real-time Localization
  51. GRB 230307A: soft X-ray detection with LEIA
  52. GRB 230307A: Swift-XRT afterglow detection
  53. GRB 230309A: AstroSat CZTI detection of a bright long GRB
  54. Further improved IPN localization for GRB 230307A
  55. GRB 230307A: SOAR/Goodman detection of the possible host galaxy
  56. GRB 230308A: CALET Gamma-Ray Burst Monitor detection
  57. GRB 230310A: AstroSat CZTI detection
  58. GRB 230307A: GECKO optical observations and detections of the afterglow
  59. GRB 230307A: MAXI/GSC upper limit
  60. GRB 230307A: Gemini-South Confirmation of the Optical Afterglow
  61. Fermi GRB 230310A: Global MASTER-Net observations report
  62. GRB 230310A: Fermi GBM Final Real-time Localization
  63. GRB 230307A: AGILE/MCAL analysis
  64. GRB 230307A: ATLAS information on the ULTRACAM optical afterglow candidate
  65. GRB 230307A: Erratum of the GCN 33441
  66. GRB 230204B: MASTER detection of an object near NTT Optical Afterglow Candidate
  67. GRB 230308A: Fermi GBM detection
  68. GRB 230307A: Possible optical afterglow
  69. GRB 230307A: ASO-S/HXI detection
  70. GRB 230307A: AstroSat LAXPC detection
  71. GRB 230228A: NUTTelA-TAO / BSTI Optical Limits
  72. GRB 230308A: AGILE/MCAL detection
  73. GRB 230307A: optical upper limit
  74. GRB 230217A: ATCA rapid-response radio detection
  75. Swift Trigger 1159108 is not a GRB
  76. GRB 230307A: Swift/BAT upper limits on the early afterglow
  77. GRB 230307A: Upper limits from a neutrino search with IceCube
  78. GRB 230307A: Swift-XRT observations
  79. Fermi GRB 230307A: Global MASTER-Net observations report
  80. Konus-Wind detection of GRB 230307A
  81. GRB 230228A: VIRT Optical Upper Limit
  82. Improved IPN localization for GRB 230307A
  83. GRB 230307A: VZLUSAT-2 detection
  84. GRB 230304B: CALET Gamma-Ray Burst Monitor detection
  85. Fermi GRB 230308A: Global MASTER-Net observations report
  86. GRB 230308A: BALROG localization (Fermi Trigger 699975152 / GRB 230308564)
  87. GRB 230308A: Fermi GBM Final Real-time Localization
  88. GRB 230307A: Tiled Swift observations
  89. GRB 230307A: Detection by GRBAlpha
  90. GRB 230305A: Detection by GRBAlpha
  91. GRB 230307A: BALROG localization (Fermi Trigger 699896651/ GRB 230307656)
  92. GRB 230307A: AstroSat CZTI detection
  93. GRB 230307A: possibly the second highest GRB energy fluence ever identified
  94. IPN triangulation of GRB 230307A (long/very bright)
  95. GRB 230307A: AGILE/MCAL detection
  96. GRB 230307A: Fermi GBM Observation of a very bright burst
  97. Solar Orbiter STIX observation of GRB 230307A
  98. GRB 230307A: Fermi GBM detection of a very bright GRB
  99. GRB 230307A: GECAM detection of an extremely bright burst
  100. GRB 230307A: Fermi GBM Final Real-time Localization

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