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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"

21526 results found.

  1. GRB 221120A: GIT upper limits on optical afterglow
  2. GRB 221120A: Swift detection of a likely short burst
  3. GRB 221119A: Fermi-LAT detection
  4. GRB 221009A: Japanese VLBI Network observation
  5. GRB 221115B: CALET Gamma-Ray Burst Monitor detection
  6. Correction to GCN 32646 (GRB 221009A (Swift J1913.1+1946): MeerLICHT observations)
  7. GRB 221115B : MeerLICHT upper limits
  8. GRB 221115A: Fermi GBM detection
  9. GRB 221115B: Swift/BAT-GUANO arcminute localization
  10. GRB 221115A: Swift/BAT-GUANO detection
  11. GRB 221110A: GRANDMA observations
  12. GRB 221009A: GRANDMA/Kilonova-Catcher observations
  13. GRB 221110A: Swift/UVOT Detection and Corrected UVOT Position
  14. GRB 221110A: Swift-BAT refined analysis
  15. GRB 221110A: Swift-XRT refined Analysis
  16. GRB 221110A: Enhanced Swift-XRT position
  17. GRB 221110A: LCOGT Optical Afterglow Detection
  18. GRB 221110A: Swift detection of a burst with an optical counterpart
  19. Swift GRB221110.10: Global MASTER-Net OT detection
  20. Swift GRB221110.10: Global MASTER-Net observations report
  21. GRB 221107A: Fermi GBM Observation
  22. GRB 221107A: Detection by GRBAlpha
  23. GRB 221107A: Swift/BAT-GUANO detection outside the coded FOV
  24. Correction to GCN 32852 (GRB 221009A: SARA-RM 1m Optical Afterglow Detection)
  25. GRB 221029A: CALET Gamma-Ray Burst Monitor detection
  26. High-precision position of the compact radio counterpart to GRB221009A
  27. GRB 221028A: GRANDMA observations
  28. GRB 221027B: GRANDMA observations
  29. GRB 221028A: Detection by VZLUSAT-2
  30. GRB 221028A: Swift-XRT refined Analysis
  31. GRB 221028A: 1.3m DFOT Optical upper limit
  32. GRB 221028A: NUTTelA-TAO / BSTI Early Optical Limits
  33. GRB 221028A: NUTTelA-TAO / BSTI Early Optical Limits
  34. GRB 221028A: AKO Optical Upper Limit
  35. GRB 221028A, Swift-BAT refined analysis
  36. GRB 221027B: Swift-BAT refined analysis
  37. GRB 221029A: Swift/BAT-GUANO detection outside the coded FOV
  38. GRB 221028A: CrAO/ZTSh optical upper limit
  39. GRB 221028A: COATLI Upper Limits
  40. Trigger 1132968: Swift trigger is the Crab
  41. GRB 221028A: HCT optical upper limit
  42. GRB 221028A: AGILE detection
  43. GRB 221028A: MITSuME Okayama optical upper limits
  44. GRB 221028A: LCOGT Optical Upper Limits
  45. GRB 221027B: COATLI Upper Limits
  46. Swift GRB 221028A: Global MASTER-Net observations report
  47. GRB 221028A: BOOTES-4/MET optical upper limit
  48. GRB 221028A: GIT optical upper limit
  49. GRB 221027B: Swift/UVOT Upper Limits
  50. GRB 221028A: Swift detection of a burst
  51. GRB 221027B: FRAM-ORM and Ondrejov SBT optical limits
  52. Swift GRB 221027B: Global MASTER-Net observations report
  53. GRB 221027B: Swift-XRT refined Analysis
  54. GRB 221027B: BOOTES-1 optical upper limit
  55. GRB 221027B: Enhanced Swift-XRT position
  56. GRB 221027B: Swift detection of a burst
  57. Konus-Wind detection of GRB 221022B
  58. GRB 221024A: Mondy optical observations
  59. GRB 221027A: Fermi-LAT detection
  60. GRB 221024A: GRANDMA observations
  61. IPN triangulation of GRB 221022C (short)
  62. GRB 221024A: Swift-BAT refined analysis
  63. GRB 221009A: SARA-RM 1m Optical Afterglow Detection
  64. GRB 221024A: Swift/UVOT UV upper limits
  65. GRB 221022A: Swift-XRT observations
  66. GRB 221024A: Swift-XRT refined Analysis
  67. GRB 221022B: Detection by GRBAlpha
  68. GRB 221025A: Fermi-LAT detection
  69. IPN triangulation of GRB 221022B (long)
  70. GRB 221024A: GIT confirmation of the optical afterglow
  71. GRB 221024A: Enhanced Swift-XRT position
  72. GRB 221024A: D50 candidate afterglow
  73. GRB 221022B: AstroSat CZTI detection
  74. GRB 221022A: Fermi GBM detection
  75. GRB 221022A: Swift ToO observations
  76. GRB 221023A: Fermi-LAT detection
  77. GRB 221022B: Fermi GBM detection
  78. GRB 221021A: Fermi GBM observation
  79. GRB 221009A: Determination of the black holes mass and spin
  80. GRB 221024A: Swift detection of a burst
  81. GRB 221022A: Swift/BAT-GUANO detection
  82. GRB 221022B: Swift/BAT-GUANO detection outside the coded FOV
  83. GRB 221009A: optical observations, SN photometric evidence
  84. GRB 221021A: Swift/BAT-GUANO detection outside the coded FOV
  85. GRB 221017A: Swift-XRT observations
  86. Improved IPN localization for GRB 221009A (BepiColombo-MGNS light curve)
  87. GRB 221009A: BOAO NIR detections
  88. GRB 221009A X-ray light-curve and the indication of TeV light-curve
  89. GRB 221009A: Spectroscopic detection of emerging SN features
  90. GRB 221013B: Swift/BAT-GUANO detection
  91. AGILE detection of the 2022 October 17 burst from SGR J1935+2154 reported by Konus-Wind
  92. GRB 221009A: GRANDMA observations
  93. The probability of observing GRB 221009A at z = 0.151
  94. GRB 221017A: Swift ToO observations
  95. AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
  96. GRB 221009A: Second epoch of NuSTAR data
  97. GRB 221016A: Swift-BAT refined analysis
  98. GRB 221016A: Swift/UVOT Detection
  99. GRB 221016A: Swift-XRT refined Analysis
  100. Konus-Wind detection of GRB 221016A

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