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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"

39440 results found.

  1. GRB 220527A: Fermi GBM Final Localization
  2. GRB 220527A: AGILE detection
  3. GRB 220521B: CALET Gamma-Ray Burst Monitor detection
  4. GRB 220525A: Fermi GBM Detection
  5. GRB 220525A: CALET Gamma-Ray Burst Monitor detection
  6. GRB 220523B: CALET Gamma-Ray Burst Monitor detection
  7. Konus-Wind detection of GRB 220524B
  8. Konus-Wind detection of GRB 220525A
  9. Konus-Wind detection of GRB 220524A
  10. Swift GRB220526.48: Global MASTER-Net observations report
  11. Fermi GRB 220525A: Global MASTER-Net observations report
  12. IPN triangulation of GRB 220525A
  13. IPN triangulation of GRB 220524B
  14. Fermi-LAT Gamma-ray Observations of IceCube-220524A
  15. IPN triangulation of GRB 220524A
  16. GRB 220525A: BALROG localization (Fermi Trigger 675130259 / GRB 220525008)
  17. GRB 220525A: Fermi GBM Final Real-time Localization
  18. GRB 220521A: ATCA detection
  19. GRB 220521A: ALMA detection
  20. Konus-Wind detection of GRB 220522B
  21. IPN triangulation of GRB 220522B
  22. GRB 220521A: BOOTES-2/TELMA and CAHA 2.2m telescope optical upper limit
  23. Konus-Wind detection of GRB 220521B
  24. GRB 220521A: classification and detection by SPI-ACS/INTEGRAL
  25. IPN triangulation of GRB 220521B
  26. GRB 220521A: ISON-Castelgrande observatory optical observations
  27. GRB 220521A: MITSuME Akeno optical upper limits
  28. Fermi GRB 220523B: Global MASTER-Net observations report
  29. GRB 220521A: Gemini Observations
  30. GRB 220523B: Fermi GBM detection
  31. GRB 220521A: MMT Afterglow Imaging
  32. GRB 220521A: REM optical/NIR upper limits
  33. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  34. Fermi GRB 220523A: Global MASTER-Net observations report
  35. GRB 220523A: Fermi GBM Final Real-time Localization
  36. GRB 220521A: LCO Optical Detection
  37. GRB 220521A: Swift-BAT refined analysis
  38. GRB 220521A: Fermi GBM detection
  39. GRB 220521A: Sintesz-Newton/CrAO optical upper limit
  40. GRB 220521A: RATIR Optical and NIR Observations
  41. GRB 220521A: Swift-XRT refined Analysis
  42. GRB 220521A: Swift/UVOT Upper Limits
  43. Fermi GRB 220522A: Global MASTER-Net observations report
  44. Fermi trigger No 674868783: Global MASTER-Net observations report
  45. GRB 220521A: SAO RAS optical observations
  46. GRB 220521A: Enhanced Swift-XRT position
  47. GRB 220522A: Fermi GBM Final Real-time Localization
  48. GRB 220521A: NOT spectroscopic redshift
  49. GRB 220521A: NOT optical afterglow detection
  50. GRB 220521A: Prompt enhanced Swift-XRT position
  51. GRB 220521A: Swift detection of a burst
  52. GRB 220521A: Fermi GBM Final Real-time Localization
  53. Swift GRB220521.97: Global MASTER-Net observations report
  54. Konus-Wind detection of GRB 220519A
  55. IPN triangulation of GRB 220519A
  56. GRB 220514A: AstroSat CZTI detection
  57. GRB 220518A: Swift-BAT refined analysis
  58. Swift GRB220519.84: Global MASTER-Net observations report
  59. GRB 220518A: Swift-XRT refined Analysis
  60. Fermi GRB 220518B: Global MASTER-Net observations report
  61. GRB 220518B: Fermi GBM Final Real-time Localization
  62. GRB 220518A: Swift/UVOT Detection
  63. GRB 220518A: Enhanced Swift-XRT position
  64. Swift GRB 220518A: Global MASTER-Net observations report
  65. GRB 220518A: Swift detection of a burst
  66. GRB 220514A: MITSuME Akeno optical observation
  67. GRB 220514A: GRANDMA Optical Afterglow Observations
  68. Konus-Wind detection of GRB 220506A
  69. Konus-Wind detection of GRB 220514B
  70. Fermi trigger No 674397342: Global MASTER-Net observations report
  71. GRB 220514A: Fermi GBM observation
  72. GRB 220514B: Swift-XRT observations
  73. GRB 220511A: Swift-XRT afterglow detection
  74. GRB 220514A: KAIT Optical Afterglow Confirmation
  75. Fermi-LAT Gamma-ray Observations of IceCube-220513A
  76. GRB 220514B: Tiled Swift observations
  77. GRB 220514B: MAXI/GSC detection
  78. MAXI GRB220514.98: Global MASTER-Net observations report
  79. GRB 220514A: MeerLICHT optical afterglow candidate
  80. Integral GRB220514.52: Global MASTER-Net observations report
  81. Fermi GRB 220514A: Global MASTER-Net observations report
  82. GRB 220514A: a long GRB detected by INTEGRAL
  83. GRB 220514A: BALROG localization (Fermi Trigger 674223877 / GRB 220514517)
  84. GRB 220514A: Fermi GBM Final Real-time Localization
  85. IceCube Alert 220513.97: Global MASTER-Net observations report
  86. Fermi GRB 220513A: Global MASTER-Net observations report
  87. GRB 220513A: Fermi GBM Final Real-time Localization
  88. Konus-Wind detection of GRB 220511A
  89. GRB 220427A: MeerLICHT afterglow observations
  90. GRB 220511A: Fermi GBM observation
  91. GRB 220511A: Swift-XRT observations
  92. GRB 220511A: AstroSat CZTI detection
  93. GRB 220511A: BOOTES-2/TELMA optical upper limit
  94. Fermi GRB 220512A: Global MASTER-Net observations report
  95. GRB 220512A: Fermi GBM Final Real-time Localization
  96. GRB 220511A: Swift ToO observations
  97. GRB 220511A: Swift/BAT-GUANO arcminute localization
  98. Fermi GRB 220511A: Global MASTER-Net observations report
  99. GRB 220511A: AGILE detection
  100. GRB 220511A: BALROG localization (Fermi Trigger 673969321/ GRB 220511571)

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