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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"

39322 results found.

  1. GRB 240218A: CMO SAI NIR upper limit
  2. Fermi GRB 240226A: Global MASTER-Net observations report
  3. GRB 240227A: Fermi GBM Final Real-time Localization
  4. Fermi Gamma-ray Burst Monitor trigger 730618809/240226236 is not a GRB
  5. GRB 240225B: Nanshan/HMT optical afterglow detection
  6. GRB 240225B: CALET Gamma-Ray Burst Monitor detection
  7. GRB 240225B: Swift-XRT observations
  8. GRB 240226B: Fermi GBM Final Real-time Localization
  9. GRB 240225C: CALET Gamma-Ray Burst Monitor detection
  10. GRB 240225B: GOTO detection of a candidate optical afterglow
  11. GRB 240226A: Fermi GBM Final Real-time Localization
  12. Transient EPW20240219aa: REM optical/NIR upper limits
  13. GRB 240225C: GRBAlpha detection
  14. GRB 240222A: ATCA radio observations
  15. Fermi trigger No 730618809: Global MASTER-Net observations report
  16. GRB 240225C: AstroSat CZTI detection
  17. GRB 240225B: AstroSat CZTI detection
  18. GRB 240225B: Tiled Swift observations
  19. GRB 240225B: MAXI/GSC detection
  20. Transient EPW20240219aa: Xinglong-2.16m optical upper limit
  21. GRB 240218A: VLA detection
  22. GRB 240225A: Swift/BAT-GUANO detection of a short burst
  23. GRB 240222A: GRBAlpha detection
  24. Transient EPW20240219aa: 7DT Optical Upper Limits
  25. VLA X-band observation of EPW20240219aa
  26. Transient EPW20240219aa: Mondy optical observations
  27. Transient EPW20240219aa: upper limit in gamma-ray range from SPI-ACS/INTEGRAL observations
  28. Swift BAT Sub-Threshold Detection of EPW20240219aa
  29. GRB 240222A: GECAM detection of a burst
  30. GRB 240222A: Swift-BAT refined analysis
  31. GRB 240222A: Swift-XRT refined Analysis
  32. GRB 240222A: Fermi GBM Observation
  33. GRB 240222A: Swift/UVOT Upper Limits
  34. Fermi GBM Sub-Threshold Detection of EPW20240219aa as a likely GRB
  35. Swift GRB 240222A: Global MASTER-Net observations report
  36. Fermi GRB 240222A: Global MASTER-Net observations report
  37. EPW20240219aa is Likely a GRB Event
  38. GRB 240222A: REM optical and NIR early-time observations
  39. GRB 240222A: Swift detection of a burst
  40. GRB 240222A: Fermi GBM Final Real-time Localization
  41. Swift GRB240221.92: Global MASTER-Net observations report
  42. GRB 240218A: MeerLICHT upper limits
  43. GRB 240216A: Glowbug gamma-ray detection
  44. GRB 240215B: Fermi GBM Observation
  45. GRB 240218A: LBT H-band detection
  46. GRB 240218A: Swift-BAT refined analysis
  47. Fermi GRB 240220A: Global MASTER-Net observations report
  48. GRB 240220A: Fermi GBM Final Real-time Localization
  49. Konus-Wind detection of GRB 240218A
  50. GRB 240218A: Swift-XRT refined Analysis
  51. GRB 240218A: VLT/X-shooter redshift of z = 6.782
  52. GRB 240218A: Fermi GBM Detection
  53. GRB 240215A: Fermi GBM Observation
  54. GRB 240216A: GRBAlpha detection
  55. GRB 240215B: GRBAlpha detection
  56. IPN triangulation of GRB 240209A
  57. Fermi trigger No 729914426: Global MASTER-Net observations report
  58. GRB 240218A: VLT/FORS2 z-band detection
  59. GRB 240218A: Enhanced Swift-XRT position
  60. GRB 240218A: REM detection of a NIR afterglow candidate
  61. GRB 240213A: GRBAlpha detection
  62. GRB 240218A : r-band upper limit from Observatoire de Haute-Provence
  63. GRB240218A: VLT/X-shooter upper limits
  64. GRB 240218A: Swift detection of a burst
  65. Swift GRB240218.08: Global MASTER-Net observations report
  66. GRB 240215C: Fermi GBM Final Real-time Localization
  67. GRB 240215B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  68. Fermi GRB 240216A: Global MASTER-Net observations report
  69. GRB 240216A: Fermi GBM Final Real-time Localization
  70. Fermi trigger No 729719508: Global MASTER-Net observations report
  71. GRB 240215A: Tiled Swift observations
  72. GRB 240215A: Swift/BAT-GUANO localization of a burst
  73. Fermi trigger No 729703985: Global MASTER-Net observations report
  74. Fermi trigger No 729650855: Global MASTER-Net observations report
  75. GRB 240209A: Classification of AT2024cew/GOTO24pw as Type Ia-pec supernova
  76. GRB 240209A: Fermi GBM observation
  77. GRB 240213A: Glowbug gamma-ray detection
  78. GRB240209A: OHP/T193 detection of the GOTO afterglow candidate AT2024cew / GOTO24pw
  79. GRB 240209A: Wendelstein Optical Observations
  80. GRB 240128A: Further Swift-XRT observations
  81. GRB 240214A: Tiled Swift observations
  82. GRB 240214A/1H 0451-560: MAXI/GSC detection
  83. GRB 240213A: BALROG localization (Fermi Trigger / GRB 240213841)
  84. Fermi GRB 240213A: Global MASTER-Net observations report
  85. GRB 240213A: Fermi GBM Final Real-time Localization
  86. GRB 240209A: NOEMA non-detection of AT2024cew / GOTO24pw counterpart candidate
  87. GRB 240209A: NOT photometry of the AT2024cew / GOTO24pw counterpart candidate
  88. GRB 240209A: GOTO optical counterpart candidate
  89. Konus-Wind detection of GRB 240204A
  90. Konus-Wind detection of GRB 240205A (short)
  91. GRB 240209A: Fermi GBM Final Localization
  92. Fermi trigger No 729152364: Global MASTER-Net observations report
  93. IPN triangulation of GRB 240205A (short)
  94. Fermi-LAT gamma-ray observations of IceCube-240204A
  95. GRB 240205B: PRIME near infrared detection
  96. GRB 240205A (short): Glowbug gamma-ray detection
  97. GRB240204A: Swift/UVOT Upper Limits
  98. GRB 240205B: AstroSat CZTI detection
  99. Fermi trigger No 729012023: Global MASTER-Net observations report
  100. GRB 240205B: Swift-BAT refined analysis

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