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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"

39455 results found.

  1. GRB 220527A: AST3-3 Yaoan Optical Observation
  2. GRB 220527A: REM optical/NIR observations
  3. GRB 220527A: VLT/X-shooter spectroscopic redshift
  4. GRB 220527A: MeerLICHT afterglow observations
  5. Fermi trigger No 675411172: Global MASTER-Net observations report
  6. GRB 220527A: NOT optical photometry and spectroscopic redshift
  7. GRB 220527A: AstroSat CZTI detection
  8. GRB 220527A: CALET Gamma-Ray Burst Monitor detection
  9. GRB 220527A: MITSuME Akeno optical observation
  10. LAT GRB220527.39: Global MASTER-Net observations report
  11. GRB 220527A: Swift/UVOT detection
  12. GRB 220527A: Swift-XRT afterglow detection
  13. GRB 220527A: Fermi GBM Observation
  14. GRB 220527A: Swift ToO observations
  15. GRB 220527A: Fermi-LAT detection
  16. GRB 220527A: Fermi GBM Final Localization
  17. GRB 220527A: AGILE detection
  18. GRB 220521B: CALET Gamma-Ray Burst Monitor detection
  19. GRB 220525A: Fermi GBM Detection
  20. GRB 220525A: CALET Gamma-Ray Burst Monitor detection
  21. GRB 220523B: CALET Gamma-Ray Burst Monitor detection
  22. Konus-Wind detection of GRB 220524B
  23. Konus-Wind detection of GRB 220525A
  24. Konus-Wind detection of GRB 220524A
  25. Swift GRB220526.48: Global MASTER-Net observations report
  26. Fermi GRB 220525A: Global MASTER-Net observations report
  27. IPN triangulation of GRB 220525A
  28. IPN triangulation of GRB 220524B
  29. Fermi-LAT Gamma-ray Observations of IceCube-220524A
  30. IPN triangulation of GRB 220524A
  31. GRB 220525A: BALROG localization (Fermi Trigger 675130259 / GRB 220525008)
  32. GRB 220525A: Fermi GBM Final Real-time Localization
  33. GRB 220521A: ATCA detection
  34. GRB 220521A: ALMA detection
  35. Konus-Wind detection of GRB 220522B
  36. IPN triangulation of GRB 220522B
  37. GRB 220521A: BOOTES-2/TELMA and CAHA 2.2m telescope optical upper limit
  38. Konus-Wind detection of GRB 220521B
  39. GRB 220521A: classification and detection by SPI-ACS/INTEGRAL
  40. IPN triangulation of GRB 220521B
  41. GRB 220521A: ISON-Castelgrande observatory optical observations
  42. GRB 220521A: MITSuME Akeno optical upper limits
  43. Fermi GRB 220523B: Global MASTER-Net observations report
  44. GRB 220521A: Gemini Observations
  45. GRB 220523B: Fermi GBM detection
  46. GRB 220521A: MMT Afterglow Imaging
  47. GRB 220521A: REM optical/NIR upper limits
  48. GRB 220514A: Swift/BAT-GUANO detection outside the coded FOV
  49. Fermi GRB 220523A: Global MASTER-Net observations report
  50. GRB 220523A: Fermi GBM Final Real-time Localization
  51. GRB 220521A: LCO Optical Detection
  52. GRB 220521A: Swift-BAT refined analysis
  53. GRB 220521A: Fermi GBM detection
  54. GRB 220521A: Sintesz-Newton/CrAO optical upper limit
  55. GRB 220521A: RATIR Optical and NIR Observations
  56. GRB 220521A: Swift-XRT refined Analysis
  57. GRB 220521A: Swift/UVOT Upper Limits
  58. Fermi GRB 220522A: Global MASTER-Net observations report
  59. Fermi trigger No 674868783: Global MASTER-Net observations report
  60. GRB 220521A: SAO RAS optical observations
  61. GRB 220521A: Enhanced Swift-XRT position
  62. GRB 220522A: Fermi GBM Final Real-time Localization
  63. GRB 220521A: NOT spectroscopic redshift
  64. GRB 220521A: NOT optical afterglow detection
  65. GRB 220521A: Prompt enhanced Swift-XRT position
  66. GRB 220521A: Swift detection of a burst
  67. GRB 220521A: Fermi GBM Final Real-time Localization
  68. Swift GRB220521.97: Global MASTER-Net observations report
  69. Konus-Wind detection of GRB 220519A
  70. IPN triangulation of GRB 220519A
  71. GRB 220514A: AstroSat CZTI detection
  72. GRB 220518A: Swift-BAT refined analysis
  73. Swift GRB220519.84: Global MASTER-Net observations report
  74. GRB 220518A: Swift-XRT refined Analysis
  75. Fermi GRB 220518B: Global MASTER-Net observations report
  76. GRB 220518B: Fermi GBM Final Real-time Localization
  77. GRB 220518A: Swift/UVOT Detection
  78. GRB 220518A: Enhanced Swift-XRT position
  79. Swift GRB 220518A: Global MASTER-Net observations report
  80. GRB 220518A: Swift detection of a burst
  81. GRB 220514A: MITSuME Akeno optical observation
  82. GRB 220514A: GRANDMA Optical Afterglow Observations
  83. Konus-Wind detection of GRB 220506A
  84. Konus-Wind detection of GRB 220514B
  85. Fermi trigger No 674397342: Global MASTER-Net observations report
  86. GRB 220514A: Fermi GBM observation
  87. GRB 220514B: Swift-XRT observations
  88. GRB 220511A: Swift-XRT afterglow detection
  89. GRB 220514A: KAIT Optical Afterglow Confirmation
  90. Fermi-LAT Gamma-ray Observations of IceCube-220513A
  91. GRB 220514B: Tiled Swift observations
  92. GRB 220514B: MAXI/GSC detection
  93. MAXI GRB220514.98: Global MASTER-Net observations report
  94. GRB 220514A: MeerLICHT optical afterglow candidate
  95. Integral GRB220514.52: Global MASTER-Net observations report
  96. Fermi GRB 220514A: Global MASTER-Net observations report
  97. GRB 220514A: a long GRB detected by INTEGRAL
  98. GRB 220514A: BALROG localization (Fermi Trigger 674223877 / GRB 220514517)
  99. GRB 220514A: Fermi GBM Final Real-time Localization
  100. IceCube Alert 220513.97: Global MASTER-Net observations report

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