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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"

27811 results found.

  1. GRB 231215A: Swift detection of a burst
  2. GRB 231214A: Fermi-LAT detection
  3. GRB 231214A: Enhanced Swift-XRT position
  4. GRB 231214B: Swift/BAT-GUANO detection of a burst
  5. GRB231214A: BOOTES-6/DPRT optical upper limit
  6. Swift GRB231214.85: Global MASTER-Net observations report
  7. GRB 231214A: Swift detection of a burst
  8. GRB 231214A: Fermi GBM Final Real-time Localization
  9. GRB 231210B: REM optical/NIR upper limits
  10. Fermi-LAT detection of increased gamma-ray activity of blazar PKS 2047+098, located inside the IceCube-231211A error region
  11. IceCube-231211A - IceCube observation of a high-energy neutrino candidate track-like event
  12. LIGO/Virgo/KAGRA S231206cc: Upper limits from Swift/BAT-GUANO
  13. LIGO/Virgo/KAGRA S231206ca: Upper limits from Swift/BAT-GUANO
  14. GRB 231212A: GECAM-C detection of a likely short burst
  15. GRB 231210B: MeerLICHT afterglow observations
  16. GRB 231210B: Swift-BAT refined analysis
  17. GRB 231210B: Swift-XRT refined Analysis
  18. GRB 231210B: Enhanced Swift-XRT position
  19. GRB 231210B: VLT/X-shooter redshift
  20. GRB 231210B: detection of the optical counterpart with the LCOGT 40cm telescope at Sutherland Observatory
  21. GRB 231210B: Swift detection of a burst with optical counterpart
  22. Swift GRB231210.90: Global MASTER-Net OT detection
  23. Swift GRB231210.90: Global MASTER-Net observations report
  24. IPN triangulation of GRB 231129C
  25. GRB 231210A: Fermi GBM Final Real-time Localization
  26. GRB 231208A: GRBAlpha detection
  27. GRB231205B: Swift/UVOT Upper Limits
  28. GRB 231208A: Glowbug gamma-ray detection
  29. GRB 231208A: AstroSat CZTI detection of a faint burst
  30. IPN triangulation of GRB 231205A
  31. GRB 231205B: Swift-BAT refined analysis
  32. GRB 231205B: 1.3m DFOT Optical upper limit
  33. GRB 231205B: AGILE detection
  34. GRB 231206B: Fermi GBM Final Real-time Localization
  35. GRB 231205B: Ondrejov D50 optical upper limit
  36. GRB 231205B: Swift-XRT refined Analysis
  37. GRB 231205B: REM optical/NIR upper limits
  38. GRB 231129C: ASIM MXGS observation and localization
  39. GRB 231205B: r'-band observations from MISTRAL at Observatoire de Haute-Provence
  40. GRB 231206A: GECAM-B detection of a short burst (correction)
  41. GRB 231205B : MITSuME Akeno optical upper limits
  42. GRB 231206A: GECAM-B detection of a short burst
  43. GRB 231205B: Zadko observatory - Gingin optical observations
  44. GRB 231205B: Gaoyazi/GOT optical upper limit
  45. GRB 231205B: Nanshan/HMT optical upper limit
  46. GRB 231205B: GECAM-B detection of a long burst
  47. GRB 231205B: LCOGT Optical Upper Limits
  48. GRB 231205B: Enhanced Swift-XRT position
  49. GRB 231204A: Glowbug gamma-ray detection
  50. Swift GRB231205.70: Global MASTER-Net observations report
  51. GRB 231204A: CALET Gamma-Ray Burst Monitor detection
  52. Fermi-LAT daily aperture light curve of T CrB now available
  53. GRB 231205B: AKO Optical Upper Limit
  54. GRB 231205B: Swift detection of a burst
  55. GRB 231204A: AstroSat CZTI detection
  56. GRB 231205A: GECAM-B detection of a short burst
  57. GRB 231205A: Fermi GBM Final Real-time Localization
  58. LIGO/Virgo/KAGRA S231129ac: Upper limits from Swift/BAT-GUANO
  59. GRB 231203A: Fermi GBM Observation
  60. GRB 231204A: Fermi GBM Final Real-time Localization
  61. GRB 231203A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  62. Konus-Wind detection of GRB 231129C
  63. IceCube-231202A - IceCube observation of a high-energy neutrino candidate track-like event
  64. The Fermi GBM team reports the detection of a likely SHORT GRB
  65. GRB 231203A: Fermi GBM Final Real-time Localization
  66. GRB 231129C: Swift-XRT afterglow detection
  67. GRB 231129C: PROMPT optical upper limits for the MAXI/GSC X-ray counterpart and the MASTER afterglow candidate
  68. GRB 231129A: VZLUSAT-2 detection
  69. GRB 231129B: Swift-XRT observations
  70. GRB 231128A: VZLUSAT-2 detection
  71. GRB 231129C: AGILE detection
  72. GRB 231129A : MITSuME Akeno optical upper limits
  73. GRB 231129C: Swift/BAT-GUANO localization of a burst outside the coded FOV
  74. GRB 231129A: Swift-BAT refined analysis
  75. GRB 231129C: MASTER OT detection
  76. GRB 231129A: BOOTES-5/JGT optical upper limit
  77. GRB 231129C: Fermi-LAT detection
  78. GRB 231129A: JinShan optical upper limit
  79. GRB 231129C: GRBAlpha detection
  80. GRB 231129C: Glowbug gamma-ray detection
  81. GRB 231129C: Swift-XRT observations
  82. GRB 231129A: Swift/UVOT Upper Limits
  83. GRB 231129A: optical upper limit in Mondy observatory
  84. GRB 231129C: GECAM-B detection of a bright burst
  85. GRB 231129C: AstroSat CZTI detection
  86. GRB 231129C: CALET Gamma-Ray Burst Monitor detection
  87. GRB 231129C: Tiled Swift observations
  88. GRB 231127A: GRBAlpha detection
  89. GRB 231129C: MAXI/GSC detection
  90. GRB 231129C: Fermi GBM detection of a very bright burst
  91. GRB 231129A: Enhanced Swift-XRT position
  92. GRB 231129A: Swift-XRT refined Analysis
  93. GRB 231129C: Fermi GBM Final Real-time Localization
  94. GRB 231129B: Tiled Swift observations
  95. GRB 231129B: MAXI/GSC detection
  96. GRB 231129A: GECAM-C detection of a long burst
  97. GRB 231129A: INTEGRAL detection of a long GRB
  98. GRB 231129A: Swift detection of a burst
  99. GRB 231128A: Fermi GBM Final Real-time Localization
  100. GRB 231123C: Fermi GBM Observation

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