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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"

36136 results found.

  1. GRB 240118A: Mondy optical observations
  2. GRB 240118A: Swift-XRT afterglow detection
  3. GRB 240118C: Fermi GBM Observation
  4. Fermi GRB 240119A: Global MASTER-Net observations report
  5. GRB 240119A: Fermi GBM Final Localization
  6. GRB 240117A: CALET Gamma-Ray Burst Monitor detection
  7. GRB 240118C: Swift/BAT-GUANO detection of a burst
  8. GRB 240118A: GRBAlpha detection
  9. GRB 240115A: Fermi GBM Observation
  10. GRB 240118C: Fermi GBM Final Localization
  11. GRB 240118D: AstroSat CZTI detection
  12. GRB 240117A: AstroSat CZTI detection
  13. GRB 240118A: Swift ToO observations
  14. GRB 240118A: AbAO optical upper limit
  15. Fermi GRB 240118B: Global MASTER-Net observations report
  16. GRB 240118A: NuSTAR Offline Analysis of the GRB
  17. GRB 240117A: Glowbug gamma-ray detection
  18. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  19. Konus-Wind detection of GRB 240118A
  20. GRB 240118C: BALROG localization (Fermi Trigger 727291408 / GRB 240118725)
  21. GRB 240118A: NuSTAR Detection of a Long GRB
  22. GRB 240118A: Fermi GBM Observation
  23. GRB 240118B: Fermi GBM Final Real-time Localization
  24. GRB 240118A: Fermi-LAT detection
  25. GRID detection of GRB 231230A
  26. GRB 240118A: Fermi GBM Final Real-time Localization
  27. GRB 240115A: Swift/BAT-GUANO detection of a short burst
  28. IPN triangulation of GRB 240112A (long)
  29. GRB 240115B: AstroSat CZTI detection
  30. LIGO/Virgo/KAGRA S240109a: Upper limits from Swift/BAT-GUANO
  31. GRB 240115B: Fermi GBM Detection
  32. GRB 240112D: Glowbug gamma-ray detection
  33. GRB 240112C: Glowbug gamma-ray detection
  34. GRB 240112C: VZLUSAT-2 detection
  35. GRB 240107A: VZLUSAT-2 detection
  36. Fermi GRB 240115B: Global MASTER-Net observations report
  37. GRB 240115B: A long GRB detected by INTEGRAL
  38. GRB 240115B: Fermi GBM Final Real-time Localization
  39. Konus-Wind detection of GRB 240112C
  40. Fermi GRB 240115A: Global MASTER-Net observations report
  41. GRB 240115A: Fermi GBM Final Real-time Localization
  42. GRB 240112C: GRBAlpha detection
  43. GRB 240114A: MAXI/GSC detection
  44. GRB 240112C: Swift/UVOT Detection
  45. GRB 240112C: Fermi GBM Detection
  46. GRB 240112C: Swift-XRT refined Analysis
  47. GRB 240112C: SAO RAS optical observations
  48. GRB 240112E: Fermi GBM Final Localization
  49. Fermi GRB 240112D: Global MASTER-Net observations report
  50. GRB 240112D: Fermi GBM Final Real-time Localization
  51. Swift GRB 240112C: Global MASTER-Net observations report
  52. Fermi GRB 240112B: Global MASTER-Net observations report
  53. GRB 240109A: Swift-BAT refined analysis
  54. GRB 240112C: Swift detection of a burst with an optical counterpart
  55. GRB 240112B: Fermi GBM Final Real-time Localization
  56. GRB 240112A: GECAM detection of a burst
  57. GRB 240109A: Fermi GBM Observation
  58. GRB 240110A: AstroSat CZTI detection
  59. GRB 240108A: Glowbug gamma-ray detection
  60. GRB 231214A: ATCA Radio Upper Limits
  61. GRB 240106B: Glowbug gamma-ray detection
  62. GRB 240106A: Glowbug gamma-ray detection
  63. GRB 240109B: Fermi GBM Final Real-time Localization
  64. Konus-Wind detection of GRB 240101C
  65. GRB 231215A: radio detection with the VLA
  66. GRB 230818A: further radio observations with the VLA
  67. GRB 230812B: further radio observations with the VLA
  68. GRB 240107A: AstroSat CZTI detection
  69. GRB 240109A: Swift detection of a short burst
  70. LIGO/Virgo/KAGRA S240104bl: Upper limits from Swift/BAT-GUANO
  71. GRB 240106A: GRBAlpha detection
  72. GRB 240107A: MAXI/GSC detection
  73. GRB 240106B: Fermi GBM Final Real-time Localization
  74. GRB 240106A: Fermi GBM Final Real-time Localization
  75. IPN triangulation of GRB 240101C (short)
  76. GRB GRB240101C: Fermi GBM observation
  77. GRB 240101A: 1.3m DFOT optical observations
  78. GRB 240102A: 1.3m DFOT optical upper limit
  79. GRB 240101B: 1.3m DFOT optical upper limit
  80. GRB 240101C: Swift/BAT-GUANO detection of a short burst
  81. GRB 240102C: AstroSat CZTI detection
  82. GRB 240101C: AstroSat CZTI detection
  83. GRB 231220A: Swift-UVOT upper limit
  84. GRB 240102A: Swift-BAT refined analysis
  85. GRB 240102A: Swift/UVOT Upper Limits
  86. GRB 231230A: Swift-BAT refined analysis
  87. GRB 240101A: Swift-BAT refined analysis
  88. GRB 240101B: Swift-BAT refined analysis
  89. GRB 240102A: Enhanced Swift-XRT position
  90. GRB 240101B: Swift-XRT refined Analysis
  91. GRB 240102A: Swift-XRT refined Analysis
  92. GRB 240102B (Fermi GBM trigger 725926335/240102925) is not a GRB
  93. GRB 240102A: LCOGT Optical Upper Limits
  94. GRB240102A: BOOTES-6/DPRT optical upper limit
  95. GRB 240102B: Fermi GBM Final Real-time Localization
  96. GRB 240101B: MarSEC Observatory, Vicenza, Italy, UPPER LIMIT
  97. GRB 240102A: Swift detection of a burst
  98. GRB 240101A: Terskol Zeiss-2000 optical observations
  99. GRB 240101C: GRBAlpha detection
  100. GRB 240101B: Swift/UVOT Upper Limits

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