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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"

36352 results found.

  1. GRB 230313A: Fermi GBM Final Real-time Localization
  2. GRB 230307A: soft X-ray detection with LEIA
  3. GRB 230307A: Swift-XRT afterglow detection
  4. GRB 230309A: AstroSat CZTI detection of a bright long GRB
  5. Further improved IPN localization for GRB 230307A
  6. GRB 230307A: SOAR/Goodman detection of the possible host galaxy
  7. GRB 230308A: CALET Gamma-Ray Burst Monitor detection
  8. GRB 230310A: AstroSat CZTI detection
  9. GRB 230307A: GECKO optical observations and detections of the afterglow
  10. GRB 230307A: MAXI/GSC upper limit
  11. GRB 230307A: Gemini-South Confirmation of the Optical Afterglow
  12. Fermi GRB 230310A: Global MASTER-Net observations report
  13. GRB 230310A: Fermi GBM Final Real-time Localization
  14. GRB 230307A: AGILE/MCAL analysis
  15. GRB 230307A: ATLAS information on the ULTRACAM optical afterglow candidate
  16. GRB 230307A: Erratum of the GCN 33441
  17. GRB 230204B: MASTER detection of an object near NTT Optical Afterglow Candidate
  18. GRB 230308A: Fermi GBM detection
  19. GRB 230307A: Possible optical afterglow
  20. GRB 230307A: ASO-S/HXI detection
  21. GRB 230307A: AstroSat LAXPC detection
  22. GRB 230228A: NUTTelA-TAO / BSTI Optical Limits
  23. GRB 230308A: AGILE/MCAL detection
  24. GRB 230307A: optical upper limit
  25. GRB 230217A: ATCA rapid-response radio detection
  26. Swift Trigger 1159108 is not a GRB
  27. GRB 230307A: Swift/BAT upper limits on the early afterglow
  28. GRB 230307A: Upper limits from a neutrino search with IceCube
  29. GRB 230307A: Swift-XRT observations
  30. Fermi GRB 230307A: Global MASTER-Net observations report
  31. Konus-Wind detection of GRB 230307A
  32. GRB 230228A: VIRT Optical Upper Limit
  33. Improved IPN localization for GRB 230307A
  34. GRB 230307A: VZLUSAT-2 detection
  35. GRB 230304B: CALET Gamma-Ray Burst Monitor detection
  36. Fermi GRB 230308A: Global MASTER-Net observations report
  37. GRB 230308A: BALROG localization (Fermi Trigger 699975152 / GRB 230308564)
  38. GRB 230308A: Fermi GBM Final Real-time Localization
  39. GRB 230307A: Tiled Swift observations
  40. GRB 230307A: Detection by GRBAlpha
  41. GRB 230305A: Detection by GRBAlpha
  42. GRB 230307A: BALROG localization (Fermi Trigger 699896651/ GRB 230307656)
  43. GRB 230307A: AstroSat CZTI detection
  44. GRB 230307A: possibly the second highest GRB energy fluence ever identified
  45. IPN triangulation of GRB 230307A (long/very bright)
  46. GRB 230307A: AGILE/MCAL detection
  47. GRB 230307A: Fermi GBM Observation of a very bright burst
  48. Solar Orbiter STIX observation of GRB 230307A
  49. GRB 230307A: Fermi GBM detection of a very bright GRB
  50. GRB 230307A: GECAM detection of an extremely bright burst
  51. GRB 230307A: Fermi GBM Final Real-time Localization
  52. GRB 230304C: AstroSat CZTI detection
  53. GRB 230304B: AstroSat CZTI detection
  54. GRB 230304A: AstroSat CZTI detection
  55. GRB 230304B: Detection by GRBAlpha
  56. GRB 230304C: Fermi GBM Final Real-time Localization
  57. GRB 230304B: Fermi GBM Final Real-time Localization
  58. GRB 230304A: Fermi GBM Final Real-time Localization
  59. GRB 230228A: 6 GHz VLA radio upper limit
  60. GRB 230228A: Swift-BAT refined analysis
  61. GRB 230228A: Swift/UVOT Upper Limits
  62. Fermi GRB 230301B: Global MASTER-Net observations report
  63. GRB 230301B: Fermi GBM Final Real-time Localization
  64. GRB 230228A: Fermi GBM Observation
  65. GRB 230228A: OSN optical upper limit
  66. GRB 230301A: Fermi GBM Final Real-time Localization
  67. GRB 230228A: Swift-XRT refined Analysis
  68. GRB 230228A: Mondy optical upper limit
  69. GRB 230228A: Enhanced Swift-XRT position
  70. GRB 230228A: Nanshan/NEXT optical upper limit
  71. GRB 230228A: Miryang Arirang Astronomical Observatory (MAAO) 0.7-m telescope optical upper limit
  72. GRB 230228A: Prompt enhanced Swift-XRT position
  73. GRB 230228A: Swift detection of a possibly short burst
  74. Fermi GRB 230227A: Global MASTER-Net observations report
  75. GRB 230227A: Fermi GBM Final Real-time Localization
  76. GRB 230217A: VLT/FORS2 optical observations and candidate counterpart
  77. GRB 230216A Mondy Observations
  78. GRB 230205A: VLA radio afterglow confirmation
  79. GRB 230217A: Swift/UVOT Upper Limits
  80. GRB 230216A: Swift/UVOT Upper Limits
  81. GRB 230217A: Continued Gemini Observations
  82. GRB 230220A: Correction to GCN 33352
  83. GRB 230222A: Fermi GBM Final Real-time Localization
  84. GRB 230217A: Swift-XRT afterglow detection
  85. GRB 230217A: Swift-BAT refined analysis
  86. Fermi GRB 230220B: Global MASTER-Net observations report
  87. GRB 230217A: AstroSat CZTI detection
  88. GRB 230217A: Gemini South optical upper limits
  89. GRB 230216B: CALET Gamma-Ray Burst Monitor detection
  90. GRB 230217A: 6 GHz VLA observations
  91. GRB 230220B: Fermi GBM Final Real-time Localization
  92. GRB 230217A: Gemini-South Optical Observation
  93. GRB 230217A: Fermi GBM observation
  94. GRB 230220A: MAXI/GSC detection
  95. Konus-Wind detection of GRB 230217A
  96. GRB 230217A: Swift-XRT observations
  97. GRB 230218A is not a GRB
  98. GRB 230218A: Fermi GBM Final Real-time Localization
  99. GRB 230217A: AGILE/MCAL detection
  100. GRB 230207B: CALET Gamma-Ray Burst Monitor detection

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