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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"

32705 results found.

  1. GRB 240229A: CALET Gamma-Ray Burst Monitor detection
  2. GRB 240225B: further SAO RAS optical observations
  3. Fermi GRB 240229A: Global MASTER-Net observations report
  4. GRB 240225B: Swift ToO observations
  5. Konus-Wind detection of GRB 240225B (long)
  6. GRB 240225B: VLT/X-shooter redshift
  7. GRB 240225B : MITSuME Akeno optical afterglow candidate detection
  8. GRB 240225B: 3.6m DOT observation
  9. GRB 240225B: WINTER near-IR observations and upper limits
  10. GRB 240225B: SAO RAS optical observations
  11. GRB 240226A: GRBAlpha detection
  12. GRB 240225B: Mondy afterglow observations
  13. Fermi GRB 240227A: Global MASTER-Net observations report
  14. GRB 240225B: Liverpool Telescope afterglow observations
  15. Swift J1727.8-1613 (GRB 230824A): Madrona Peak Observatory - optical follow-up
  16. IPN triangulation of GRB 240227A (short)
  17. GRB 240225B: Liverpool Telescope optical afterglow observations
  18. GRB 240225B: NOT optical observations
  19. GRB 240218A: CMO SAI NIR upper limit
  20. Fermi GRB 240226A: Global MASTER-Net observations report
  21. Fermi Gamma-ray Burst Monitor trigger 730618809/240226236 is not a GRB
  22. GRB 240225B: Nanshan/HMT optical afterglow detection
  23. GRB 240225B: CALET Gamma-Ray Burst Monitor detection
  24. Transient EPW20240219aa: Kp-band imaging observations with NIRES
  25. Transient EPW20240219aa: J-band upper limits from WINTER
  26. GRB 240225C: CALET Gamma-Ray Burst Monitor detection
  27. GRB 240225B: GOTO detection of a candidate optical afterglow
  28. Transient EPW20240219aa: REM optical/NIR upper limits
  29. GRB 240225C: GRBAlpha detection
  30. GRB 240222A: ATCA radio observations
  31. GRB 240225B: AstroSat CZTI detection
  32. GRB 240225B: Tiled Swift observations
  33. Transient EPW20240219aa: Xinglong-2.16m optical upper limit
  34. GRB 240218A: VLA detection
  35. GRB 240222A: GRBAlpha detection
  36. Transient EPW20240219aa: GECKO: LOAO Optical Upper Limits
  37. Transient EPW20240219aa: 7DT Optical Upper Limits
  38. VLA X-band observation of EPW20240219aa
  39. Transient EPW20240219aa: Mondy optical observations
  40. Transient EPW20240219aa: upper limit in gamma-ray range from SPI-ACS/INTEGRAL observations
  41. Insight-HXMT/HE Sub-Threshold Detection of Transient EPW20240219aa
  42. Swift BAT Sub-Threshold Detection of EPW20240219aa
  43. Transient EPW20240219aa: Liverpool Telescope non-detection and limiting magnitude
  44. GRB 240222A: GECAM detection of a burst
  45. GRB 240222A: Swift-BAT refined analysis
  46. GRB 240222A: Fermi GBM Observation
  47. GRB 240222A: Swift/UVOT Upper Limits
  48. Fermi GBM Sub-Threshold Detection of EPW20240219aa as a likely GRB
  49. Swift GRB 240222A: Global MASTER-Net observations report
  50. Fermi GRB 240222A: Global MASTER-Net observations report
  51. GRB 240222A: REM optical and NIR early-time observations
  52. GRB 240218A: MeerLICHT upper limits
  53. GRB 240216A: Glowbug gamma-ray detection
  54. GRB 240215B: Fermi GBM Observation
  55. GRB 240218A: LBT H-band detection
  56. GRB 240218A: Swift-BAT refined analysis
  57. Fermi GRB 240220A: Global MASTER-Net observations report
  58. Konus-Wind detection of GRB 240218A
  59. GRB 240218A: VLT/X-shooter redshift of z = 6.782
  60. GRB 240218A: Fermi GBM Detection
  61. GRB 240215A: Fermi GBM Observation
  62. GRB 240216A: GRBAlpha detection
  63. GRB 240215B: GRBAlpha detection
  64. IPN triangulation of GRB 240209A
  65. GRB 240218A: VLT/FORS2 z-band detection
  66. GRB 240218A: REM detection of a NIR afterglow candidate
  67. GRB 240213A: GRBAlpha detection
  68. GRB 240218A : r-band upper limit from Observatoire de Haute-Provence
  69. GRB240218A: VLT/X-shooter upper limits
  70. Fermi GRB 240216A: Global MASTER-Net observations report
  71. GRB 240215A: Tiled Swift observations
  72. GRB 240215A: Swift/BAT-GUANO localization of a burst
  73. GRB 240209A: Classification of AT2024cew/GOTO24pw as Type Ia-pec supernova
  74. GRB 240209A: Fermi GBM observation
  75. GRB 240213A: Glowbug gamma-ray detection
  76. GRB240209A: OHP/T193 detection of the GOTO afterglow candidate AT2024cew / GOTO24pw
  77. GRB 240209A: Wendelstein Optical Observations
  78. GRB 240128A: Further Swift-XRT observations
  79. GRB 240214A: Tiled Swift observations
  80. Fermi GRB 240213A: Global MASTER-Net observations report
  81. GRB 240209A: NOEMA non-detection of AT2024cew / GOTO24pw counterpart candidate
  82. GRB 240209A: NOT photometry of the AT2024cew / GOTO24pw counterpart candidate
  83. GRB 240209A: GOTO optical counterpart candidate
  84. Konus-Wind detection of GRB 240204A
  85. Konus-Wind detection of GRB 240205A (short)
  86. IPN triangulation of GRB 240205A (short)
  87. Fermi-LAT gamma-ray observations of IceCube-240204A
  88. GRB 240205B: PRIME near infrared detection
  89. GRB 240205A (short): Glowbug gamma-ray detection
  90. GRB240204A: Swift/UVOT Upper Limits
  91. GRB 240205B: AstroSat CZTI detection
  92. GRB 240205B: Swift-BAT refined analysis
  93. Konus-Wind detection of GRB 240205B (long / very soft)
  94. Konus-Wind detection of GRB 240125A
  95. GRB 240205B: VLT/X-shooter redshift
  96. GRB 240205B: CALET Gamma-Ray Burst Monitor detection
  97. GRB 240205B: ATCA detection of radio counterpart
  98. GRB 240205B: REM detection of the optical/NIR afterglow
  99. GRB 240205B: Fermi GBM Observation
  100. GRB 240204A: AstroSat CZTI detection

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