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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"

24583 results found.

  1. GRB 221104A: Fermi GBM Final Localization
  2. GRB 221108A: Fermi GBM Final Localization
  3. GRB 221107A: Fermi GBM Observation
  4. GRB 221107A: Detection by GRBAlpha
  5. GRB 221009A: Extended Bad Time Intervals for Fermi LAT data
  6. GRB 221107A: Swift/BAT-GUANO detection outside the coded FOV
  7. IceCube-221104A: Upper limits from a search for additional neutrino events in IceCube
  8. GRB 221107A: Fermi GBM Final Localization
  9. IceCube Alert 221104.26: Global MASTER-Net observations report
  10. Fermi-LAT gamma-ray observations of IceCube-221104A
  11. IceCube-221104A - IceCube observation of a high-energy neutrino candidate track-like event
  12. GRB 221029A: CALET Gamma-Ray Burst Monitor detection
  13. GRB 221028A: GRANDMA observations
  14. GRB 221027B: GRANDMA observations
  15. GRB 221028A: Detection by VZLUSAT-2
  16. GRB 221029A: Fermi GBM observation
  17. Konus-Wind detection of GRB 221022C
  18. GRB 221029A: Fermi GBM Final Localization
  19. GRB 221028A: 1.3m DFOT Optical upper limit
  20. GRB 221028A: NUTTelA-TAO / BSTI Early Optical Limits
  21. GRB 221028A: NUTTelA-TAO / BSTI Early Optical Limits
  22. GRB 221028A: Correction to GCN 32893 - Fluence and flux are for 50-150 keV
  23. GRB 221028A: AKO Optical Upper Limit
  24. GRB 221028A, Swift-BAT refined analysis
  25. GRB 221027B: Swift-BAT refined analysis
  26. GRB 221029A: Swift/BAT-GUANO detection outside the coded FOV
  27. GRB 221029A: Detection by GRBAlpha
  28. GRB 221028A: CrAO/ZTSh optical upper limit
  29. GRB 221028A: AGILE detection
  30. GRB 221027A: AGILE detection
  31. GRB 221028A: MITSuME Okayama optical upper limits
  32. GRB 221028A: LCOGT Optical Upper Limits
  33. Swift GRB 221028A: Global MASTER-Net observations report
  34. LIGO-Virgo-KAGRA and GEO600 statement on GRB 221009A
  35. GRB 221028A: Swift detection of a burst
  36. Konus-Wind detection of GRB 221017A
  37. Swift GRB 221027B: Global MASTER-Net observations report
  38. GRB 221027A: Fermi GBM detection
  39. IPN triangulation of GRB 221025A (short)
  40. Konus-Wind detection of GRB 221022B
  41. GRB 221027A: Fermi-LAT detection
  42. GRB 221027A: Fermi GBM Final Real-time Localization
  43. GRB 221024A: GRANDMA observations
  44. IPN triangulation of GRB 221022C (short)
  45. GRB 221023A: AGILE/GRID analysis
  46. SGR 1935+2154: AstroSat CZTI Detections
  47. GRB 221024A: Swift-BAT refined analysis
  48. GRB 221009A: SARA-RM 1m Optical Afterglow Detection
  49. GRB 221025A: Fermi GBM Observation
  50. Konus-Wind detection of GRB 221023A
  51. GRB 221022A: Swift-XRT observations
  52. GRB 221024A: Swift-XRT refined Analysis
  53. GRB 221023A: Fermi GBM Observation
  54. GRB 221022B: Detection by GRBAlpha
  55. GRB 221025A: Fermi-LAT detection
  56. IPN triangulation of GRB 221022B (long)
  57. LAT GRB221025.04: Global MASTER-Net observations report
  58. GRB 221022A: Fermi GBM detection
  59. GRB 221023A: Fermi-LAT detection
  60. GRB 221022B: Fermi GBM detection
  61. GRB 221021A: Fermi GBM observation
  62. GRB 221024A: Swift detection of a burst
  63. GRB 221023A: Fermi GBM Final Localization
  64. GRB 221023A: AGILE detection of a burst
  65. GRB 221022A: Swift/BAT-GUANO detection
  66. GRB 221022B: Swift/BAT-GUANO detection outside the coded FOV
  67. GRB 221022B: AGILE detection
  68. GRB 221009A: James Webb Space Telescope Observations
  69. GRB 221022B: Fermi GBM Final Real-time Localization
  70. GRB 221009A: Analysis of the initial episode using data of GBM/Fermi and SPI-ACS/INTEGRAL
  71. GRB 221021A: Swift/BAT-GUANO detection outside the coded FOV
  72. GRB 221022A: Fermi GBM Final Real-time Localization
  73. GRB 221020A: Detection by GRBAlpha
  74. SGR 1935+21542: VZLUSAT-2 and GRBAlpha joint detection
  75. GRB 221021A: Fermi GBM Final Real-time Localization
  76. GRB 221009A: 1.3m DFOT Optical Observations
  77. GRB 221009A: Peak luminosity of the supernova vs. synchrotron afterglow
  78. GRB 221017A: Swift-XRT observations
  79. GRB 221020A: Fermi GBM Final Real-time Localization
  80. Improved IPN localization for GRB 221009A (BepiColombo-MGNS light curve)
  81. GRB 221009A: TNG NIR detection
  82. GRB 221009A X-ray light-curve and the indication of TeV light-curve
  83. AGILE detection of a burst from SGR J1935+2154 reported by VZLUSAT-2
  84. GRB 221009A: Spectroscopic detection of emerging SN features
  85. GRB 221013B: Swift/BAT-GUANO detection
  86. SGR 1935+2154: Bursting activity detected by VZLUSAT-2
  87. AGILE detection of the 2022 October 17 burst from SGR J1935+2154 reported by Konus-Wind
  88. GRB 221009A: GRANDMA observations
  89. SGR 1935+2154: Detection by GRBAlpha
  90. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 October 17
  91. GRB 221009A: Medicina Radio Telescope observations
  92. AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
  93. GRB 221009A: Second epoch of NuSTAR data
  94. IPN triangulation of GRB 221017A (long)
  95. GRB 221016A: Swift-BAT refined analysis
  96. Konus-Wind detection of GRB 221016A
  97. GRB 221016A: Fermi GBM observation
  98. GRB 220926B: Detection by GRBAlpha
  99. MAXI GRB221017.24: Global MASTER-Net observations report
  100. GRB 221016A: LCOGT Optical Afterglow Detection

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