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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"

36400 results found.

  1. Swift GRB 221028A: Global MASTER-Net observations report
  2. GRB 221028A: BOOTES-4/MET optical upper limit
  3. LIGO-Virgo-KAGRA and GEO600 statement on GRB 221009A
  4. GRB 221028A: GIT optical upper limit
  5. GRB 221027B: Swift/UVOT Upper Limits
  6. GRB 221028A: Swift detection of a burst
  7. GRB 221027B: FRAM-ORM and Ondrejov SBT optical limits
  8. Konus-Wind detection of GRB 221017A
  9. Swift GRB 221027B: Global MASTER-Net observations report
  10. GRB 221027B: Swift-XRT refined Analysis
  11. GRB 221027B: BOOTES-1 optical upper limit
  12. GRB 221027B: Enhanced Swift-XRT position
  13. GRB 221027B: Swift detection of a burst
  14. GRB 221027A: Fermi GBM detection
  15. IPN triangulation of GRB 221025A (short)
  16. Konus-Wind detection of GRB 221022B
  17. GRB 221024A: Mondy optical observations
  18. GRB 221027A: Fermi-LAT detection
  19. GRB 221027A: Fermi GBM Final Real-time Localization
  20. GRB 221009A: Further Gemini-South Infrared Observations
  21. GRB 221024A: GRANDMA observations
  22. Fermi Gamma-ray Burst Monitor trigger 688431261/221025954 is not a GRB
  23. IPN triangulation of GRB 221022C (short)
  24. GRB 221023A: AGILE/GRID analysis
  25. GRB 221024A: Swift-BAT refined analysis
  26. GRB 221025A: AstroSat CZTI detection
  27. GRB 221009A: SARA-RM 1m Optical Afterglow Detection
  28. GRB 221025A: Fermi GBM Observation
  29. GRB 221009A: spectroscopic confirmation of SN in LBT spectra
  30. Konus-Wind detection of GRB 221023A
  31. GRB 221024A: Swift/UVOT UV upper limits
  32. GRB 221022A: Swift-XRT observations
  33. GRB 221024A: Swift-XRT refined Analysis
  34. GRB 221023A: Fermi GBM Observation
  35. GRB 221022B: Detection by GRBAlpha
  36. GRB 221025A: Fermi-LAT detection
  37. IPN triangulation of GRB 221022B (long)
  38. GRB 221024A: GIT confirmation of the optical afterglow
  39. GRB 221024A: Enhanced Swift-XRT position
  40. GRB 221024A: D50 candidate afterglow
  41. GRB 221022B: AstroSat CZTI detection
  42. GRB 221022A: Fermi GBM detection
  43. GRB 221022A: Swift ToO observations
  44. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  45. GRB 221023A: Fermi-LAT detection
  46. GRB 221022B: Fermi GBM detection
  47. GRB 221021A: Fermi GBM observation
  48. GRB 221009A: Determination of the black holes mass and spin
  49. GRB 221024A: Swift detection of a burst
  50. GRB 221023A: Fermi GBM Final Localization
  51. GRB 221023A: AGILE detection of a burst
  52. GRB 221022A: Swift/BAT-GUANO detection
  53. GRB 221022B: Swift/BAT-GUANO detection outside the coded FOV
  54. GRB 221022B: AGILE detection
  55. GRB 221009A: James Webb Space Telescope Observations
  56. GRB 221022B: Fermi GBM Final Real-time Localization
  57. GRB 221009A: Analysis of the initial episode using data of GBM/Fermi and SPI-ACS/INTEGRAL
  58. GRB 221009A: optical observations, SN photometric evidence
  59. GRB 221021A: Swift/BAT-GUANO detection outside the coded FOV
  60. GRB 221022A: Fermi GBM Final Real-time Localization
  61. GRB 221020A: Detection by GRBAlpha
  62. SGR 1935+21542: VZLUSAT-2 and GRBAlpha joint detection
  63. GRB 221017A: CALET Gamma-Ray Burst Monitor detection
  64. GRB 221021A: Fermi GBM Final Real-time Localization
  65. GRB 221009A: 1.3m DFOT Optical Observations
  66. Fermi GBM trigger 687320613 / 221013100 (GRB 221013B) is not a GRB
  67. GRB221009A: LBT optical imaging
  68. GRB 221009A: Peak luminosity of the supernova vs. synchrotron afterglow
  69. GRB 221017A: Swift-XRT observations
  70. GRB 221020A: Fermi GBM Final Real-time Localization
  71. Improved IPN localization for GRB 221009A (BepiColombo-MGNS light curve)
  72. GRB 221009A: TNG NIR detection
  73. GRB 221009A: BOAO NIR detections
  74. GRB 221009A X-ray light-curve and the indication of TeV light-curve
  75. GRB 221009A: Spectroscopic detection of emerging SN features
  76. GRB 221009A: Continued LDT Afterglow Monitoring
  77. GRB 221013B: Swift/BAT-GUANO detection
  78. SGR 1935+2154: Bursting activity detected by VZLUSAT-2
  79. GRB 221009A: GRANDMA observations
  80. The probability of observing GRB 221009A at z = 0.151
  81. GRB 221009A: Medicina Radio Telescope observations
  82. GRB 221017A: Swift ToO observations
  83. GRB 221009A: Second epoch of NuSTAR data
  84. IPN triangulation of GRB 221017A (long)
  85. GRB 221016A: Swift-BAT refined analysis
  86. GRB 221016A: Swift/UVOT Detection
  87. GRB 221016A: Swift-XRT refined Analysis
  88. Konus-Wind detection of GRB 221016A
  89. GRB 221016A: Fermi GBM observation
  90. GRB 220926B: Detection by GRBAlpha
  91. GRB 221009A: A type I BdHN of exceptional energetics
  92. GRB 221016A: z-band upper limit, possible afterglow brightening
  93. GRB 221017A: MAXI/GSC detection
  94. GRB 221016A: Enhanced Swift-XRT position
  95. GRB 221016A: LCOGT Optical Afterglow Detection
  96. GRB 221016A: Swift detection of a burst
  97. GRB 221016A: Fermi GBM Final Real-time Localization
  98. GRB 221009A: Faulkes Telescope North continued optical afterglow follow-up
  99. GRB 221009A: continued Assy optical afterglow observations, possible SN evidence
  100. GRB 221009A: LEIA X-ray Afterglow Detection

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