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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"

32720 results found.

  1. Swift Trigger 1218645: Another detection of Swift J151857.0-572147
  2. IPN triangulation of GRB 240303B
  3. Swift J151857.0-572147: Swift-BAT refined analysis
  4. GRB 240303B: Fermi GBM Detection
  5. GRB 240225B: Swift-XRT afterglow detection
  6. Swift detection of Swift J151857.0-572147
  7. GRB 240303B: CALET Gamma-Ray Burst Monitor detection
  8. Swift GRB 240303A: Global MASTER-Net observations report
  9. Swift J151857.0-572147: Confirmation of a new galactic transient
  10. GRB 240225B: Glowbug gamma-ray detection
  11. IceCube-240229A: Upper limits from a search for additional neutrino events in IceCube
  12. GRB 240225C: Glowbug gamma-ray detection
  13. GRB 240225A (short): Glowbug gamma-ray detection
  14. GRB 240229A: DDOTI Upper Limits on the Afterglow
  15. GRB 240218A: NOEMA upper limit
  16. GRB 240229A: CALET Gamma-Ray Burst Monitor detection
  17. GRB 240225B: further SAO RAS optical observations
  18. Fermi GRB 240229A: Global MASTER-Net observations report
  19. GRB 240225B: Swift ToO observations
  20. Konus-Wind detection of GRB 240225B (long)
  21. GRB 240225B: VLT/X-shooter redshift
  22. GRB 240225B : MITSuME Akeno optical afterglow candidate detection
  23. GRB 240225B: 3.6m DOT observation
  24. GRB 240225B: WINTER near-IR observations and upper limits
  25. GRB 240225B: SAO RAS optical observations
  26. GRB 240226A: GRBAlpha detection
  27. GRB 240225B: Mondy afterglow observations
  28. Fermi GRB 240227A: Global MASTER-Net observations report
  29. GRB 240225B: Liverpool Telescope afterglow observations
  30. Swift J1727.8-1613 (GRB 230824A): Madrona Peak Observatory - optical follow-up
  31. IPN triangulation of GRB 240227A (short)
  32. GRB 240225B: Liverpool Telescope optical afterglow observations
  33. GRB 240225B: NOT optical observations
  34. GRB 240218A: CMO SAI NIR upper limit
  35. Fermi GRB 240226A: Global MASTER-Net observations report
  36. Fermi Gamma-ray Burst Monitor trigger 730618809/240226236 is not a GRB
  37. GRB 240225B: Nanshan/HMT optical afterglow detection
  38. GRB 240225B: CALET Gamma-Ray Burst Monitor detection
  39. Transient EPW20240219aa: Kp-band imaging observations with NIRES
  40. Transient EPW20240219aa: J-band upper limits from WINTER
  41. GRB 240225C: CALET Gamma-Ray Burst Monitor detection
  42. GRB 240225B: GOTO detection of a candidate optical afterglow
  43. Transient EPW20240219aa: REM optical/NIR upper limits
  44. GRB 240225C: GRBAlpha detection
  45. GRB 240222A: ATCA radio observations
  46. GRB 240225B: AstroSat CZTI detection
  47. GRB 240225B: Tiled Swift observations
  48. Transient EPW20240219aa: Xinglong-2.16m optical upper limit
  49. GRB 240218A: VLA detection
  50. GRB 240222A: GRBAlpha detection
  51. Transient EPW20240219aa: GECKO: LOAO Optical Upper Limits
  52. Transient EPW20240219aa: 7DT Optical Upper Limits
  53. VLA X-band observation of EPW20240219aa
  54. Transient EPW20240219aa: Mondy optical observations
  55. Transient EPW20240219aa: upper limit in gamma-ray range from SPI-ACS/INTEGRAL observations
  56. Insight-HXMT/HE Sub-Threshold Detection of Transient EPW20240219aa
  57. Swift BAT Sub-Threshold Detection of EPW20240219aa
  58. Transient EPW20240219aa: Liverpool Telescope non-detection and limiting magnitude
  59. GRB 240222A: GECAM detection of a burst
  60. GRB 240222A: Swift-BAT refined analysis
  61. GRB 240222A: Fermi GBM Observation
  62. GRB 240222A: Swift/UVOT Upper Limits
  63. Fermi GBM Sub-Threshold Detection of EPW20240219aa as a likely GRB
  64. Swift GRB 240222A: Global MASTER-Net observations report
  65. Fermi GRB 240222A: Global MASTER-Net observations report
  66. GRB 240222A: REM optical and NIR early-time observations
  67. GRB 240218A: MeerLICHT upper limits
  68. GRB 240216A: Glowbug gamma-ray detection
  69. GRB 240215B: Fermi GBM Observation
  70. GRB 240218A: LBT H-band detection
  71. GRB 240218A: Swift-BAT refined analysis
  72. Fermi GRB 240220A: Global MASTER-Net observations report
  73. Konus-Wind detection of GRB 240218A
  74. GRB 240218A: VLT/X-shooter redshift of z = 6.782
  75. GRB 240218A: Fermi GBM Detection
  76. GRB 240215A: Fermi GBM Observation
  77. GRB 240216A: GRBAlpha detection
  78. GRB 240215B: GRBAlpha detection
  79. IPN triangulation of GRB 240209A
  80. GRB 240218A: VLT/FORS2 z-band detection
  81. GRB 240218A: REM detection of a NIR afterglow candidate
  82. GRB 240213A: GRBAlpha detection
  83. GRB 240218A : r-band upper limit from Observatoire de Haute-Provence
  84. GRB240218A: VLT/X-shooter upper limits
  85. Fermi GRB 240216A: Global MASTER-Net observations report
  86. GRB 240215A: Tiled Swift observations
  87. GRB 240215A: Swift/BAT-GUANO localization of a burst
  88. GRB 240209A: Classification of AT2024cew/GOTO24pw as Type Ia-pec supernova
  89. GRB 240209A: Fermi GBM observation
  90. GRB 240213A: Glowbug gamma-ray detection
  91. GRB240209A: OHP/T193 detection of the GOTO afterglow candidate AT2024cew / GOTO24pw
  92. GRB 240209A: Wendelstein Optical Observations
  93. GRB 240128A: Further Swift-XRT observations
  94. GRB 240214A: Tiled Swift observations
  95. Fermi GRB 240213A: Global MASTER-Net observations report
  96. GRB 240209A: NOEMA non-detection of AT2024cew / GOTO24pw counterpart candidate
  97. GRB 240209A: NOT photometry of the AT2024cew / GOTO24pw counterpart candidate
  98. GRB 240209A: GOTO optical counterpart candidate
  99. Konus-Wind detection of GRB 240204A
  100. Konus-Wind detection of GRB 240205A (short)

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