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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"

39455 results found.

  1. GRB 220403B: Swift detection of a burst with an optical counterpart
  2. Fermi GRB 220403A: Global MASTER-Net observations report
  3. GRB 220403A: Fermi GBM Final Real-time Localization
  4. GRB 220401A: Swift/BAT-GUANO detection outside the coded FOV
  5. GRB 220401A: Fermi GBM observation
  6. Swift Trigger 1100848 is likely not a GRB
  7. Swift GRB220402.16: Global MASTER-Net observations report
  8. Fermi GRB 220401B: Global MASTER-Net observations report
  9. GRB 220401B: Fermi GBM Final Real-time Localization
  10. GRB 220401A: Fermi GBM Final Localization
  11. Fermi trigger No 670501065: Global MASTER-Net observations report
  12. Fermi Gamma-ray Burst Monitor trigger 220331776/670444627 is not a GRB
  13. GRB 220331A: Fermi GBM Final Real-time Localization
  14. Fermi GRB 220330A: Global MASTER-Net observations report
  15. GRB 220330A: Fermi GBM Final Real-time Localization
  16. ZTF22aaajecp/AT2022cmc: 1.3m DFOT Optical observations
  17. GRB 220325A: GRANDMA observations
  18. GRB 220320A: Detection by VZLUSAT-2
  19. Konus-Wind observation of GRB 220320A
  20. GRB 220325A: Swift/UVOT Upper Limits
  21. GRB 211024B: Host galaxy redshift from X-shooter/VLT
  22. GRB 220325A: Swift-BAT refined analysis
  23. ZTF22aaajecp/AT2022cmc: continued optical observations (Mondy, TSHAO, AbAO)
  24. GRB 220325A: Tautenburg observations
  25. GRB 220326A: Fermi GBM Final Localization
  26. GRB 220325A: LCO Optical Upper Limits
  27. GRB 220325A: Swift-XRT refined Analysis
  28. GRB 220325A: 1.3m DFOT Optical upper limit
  29. GRB 220325B: Fermi GBM Final Localization
  30. Fermi GBM Sub-Threshold Detection of GRB 220325A
  31. GRB 220325A: Enhanced Swift-XRT position
  32. GRB 220325A: MASTER Global Robotic Net optical observations
  33. GRB 220324A: AstroSat CZTI detection
  34. GRB 220325A: Swift detection of a burst
  35. GRB 220323A: AstroSat CZTI detection
  36. GRB 220319A: GRANDMA observations
  37. GRB 220323A: AGILE/MCAL detection
  38. IPN triangulation of GRB 220320A
  39. GRB 220323A: Fermi GBM Final Real-time Localization
  40. GRB 220319A: Swift-BAT refined analysis
  41. GRB 220316A: AstroSat CZTI detection
  42. GRB 220320A: AstroSat CZTI detection
  43. GRB 220317A: Fermi GBM detection
  44. GRB 220321A: Fermi GBM Final Localization
  45. GRB 220319A: MITSuME Akeno optical upper limits
  46. GRB 220319A: LCO Optical Upper Limit
  47. GRB 220319A: Mondy optical uper limit
  48. GRB 220319A: Swift-XRT refined Analysis
  49. GRB 220319A: Enhanced Swift-XRT position
  50. GRB 220319A: MASTER Global Robotic Net optical observations
  51. GRB 220319A: Swift detection of a burst
  52. Fermi-LAT Gamma-ray Observations of IceCube-220317A
  53. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  54. GRB 220310A: MITSuME Akeno optical observation
  55. IceCube-220317A: MASTER Global Robotic Net optical observations
  56. GRB 220317A: Fermi GBM Final Real-time Localization
  57. IceCube-220317A - IceCube observation of a high-energy neutrino candidate track-like event
  58. GRB 220315A: MASTER Global Robotic Net optical observations
  59. GRB 220311A: Fermi GBM observation
  60. GRB 220306B: Swift/UVOT Upper Limits
  61. GRB 220315A: Fermi GBM Final Real-time Localization
  62. GRB 220311A: MITSuME Akeno optical upper limits
  63. IPN triangulation of GRB 220310A
  64. GRB 220310C: Fermi GBM observation
  65. GRB 210722A: TAROT Reunion observatory optical light curve
  66. GRB 210222B: TAROT Reunion observatory optical light curve
  67. GRB 201021C: TAROT Reunion observatory optical light curve
  68. GRB 220310A: K-800 of Terskol observatory optical upper limit
  69. GRB 220310A: [KAO-Egypt] SDSS r, i observation
  70. GRB 220310C: Swift-XRT observations
  71. Konus-Wind detection of GRB 220310A
  72. GRB 220310C: Swift ToO observations
  73. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  74. GRB 220311A: MASTER OT retraction
  75. GRB 220311A: A long GRB detected by INTEGRAL
  76. Integral GRB220311.69: Global MASTER-Net observations report
  77. Integral GRB220311.69: Global MASTER-Net observations report
  78. Integral GRB220311.69: Global MASTER-Net OT detection
  79. GRB 220311A: Fermi GBM Final Real-time Localization
  80. ZTF22aabjpxh/AT2022cva (GRB 220219B): evidence of supernova in LBT spectra
  81. GRB 220310A: GIT confirmation of optical afterglow.
  82. GRB 220306B: Nanshan/NEXT optical upper limit
  83. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, possible photometric evidence of SN
  84. GRB 220310C: Fermi GBM Final Real-time Localization
  85. Fermi GBM Detection of GRB 220308A
  86. GRB 220308A: AGILE detection
  87. GRB 220310A: MASTER optical counterpart detection
  88. GRB 220310A: Swift ToO observations
  89. GRB 220310A: CALET Gamma-Ray Burst Monitor detection
  90. Fermi GRB 220310B: Global MASTER-Net observations report
  91. GRB 220310B: Fermi GBM Final Real-time Localization
  92. GRB 220308B: Fermi GBM detection
  93. GRB 220310A: MAXI/GSC detection
  94. MAXI GRB220310.02: Global MASTER-Net observations report
  95. Konus-Wind detection of GRB 220308A
  96. CALET Gamma-Ray Burst Monitor detection of GRB 220308A and its possible precursor
  97. Fermi GRB 220309A: Global MASTER-Net observations report
  98. GRB 220309A: Fermi GBM Final Real-time Localization
  99. GRB 220308A: Swift/BAT-GUANO detection outside the coded FOV
  100. IPN triangulation of GRB 220308A (long / very bright)

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