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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"

27943 results found.

  1. GRB 211018A: Swift ToO observations
  2. BepiColombo MGNS joins the IPN
  3. GRB 211019A: Detection by GRBAlpha
  4. GRB 211018A: Detection by GRBAlpha
  5. GRB 211018A: Fermi-LAT detection
  6. GRB 211019A: Fermi GBM Final Real-time Localization
  7. Swift GRB211017.99: Global MASTER-Net observations report
  8. Swift trigger 1078701: MITSuME Akeno optical upper limits
  9. Swift Trigger 1078701: Mondy, CrAO, AbAO observations, possible optical counterpart
  10. Swift GRB211010.45: Global MASTER-Net observations report
  11. Swift Trigger 1078701 is probably not a GRB
  12. IceCube-20210922A: DESNU Optical counterpart candidate from 5 nights of DECam observations
  13. GRB 210928A: MeerKAT detection
  14. Konus-Wind detection of GRB 210928A
  15. Correction to GCN 30915: GRB 210928A: Swift-XRT analysis
  16. GRB 210928A: Kinder SLT-40cm optical limits
  17. GRB 210930A: Swift-BAT refined analysis
  18. SGR 1935+2154: Swift/BAT-GUANO detection and arcminute localization
  19. GRB 210928A: Swift-XRT analysis (replaces GCN 30914)
  20. GRB 210928A: Swift-XRT refined Analysis
  21. GRB 210928A: Fermi-LAT detection
  22. Swift GRB211001.03 / trigger 1076121 : MASTER OT retraction
  23. GRB 210927B: GECAM detection
  24. GRB 210930A: CAHA 2.2m telescope optical limit
  25. Swift GRB211001.03: Global MASTER-Net observations report
  26. Swift Trigger 1076121 is not a GRB
  27. Swift GRB211001.03: Global MASTER-Net OT detection
  28. GRB 210930A: Swift/UVOT Upper Limits
  29. GRB 210930A: Swift-XRT refined Analysis
  30. Swift GRB 210930A: Global MASTER-Net observations report
  31. GRB 210930A: Enhanced Swift-XRT position
  32. GRB 210930A: Swift detection of a burst
  33. GRB 210929B: Fermi GBM Final Real-time Localization
  34. GRB 210929A: Fermi GBM Final Real-time Localization
  35. GRB 210927A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 654396242)
  36. GRB 210925B: AstroSat CZTI detection
  37. IPN triangulation of GRB 210925B
  38. GRB 210926A: AstroSat CZTI detection
  39. GRB 210919A: iTelescope T-11 upper limits
  40. IceCube-210926A: No neutrino counterpart candidates in ANTARES search
  41. GRB 210926A: GECAM detection
  42. GRB 210927A: Fermi GBM Final Real-time Localization
  43. GRB 210919A OSN 1.5m Source Confirmation
  44. GRB 210919A CAHA 2.2m Observations: Afterglow/Host Galaxy Candidate
  45. GRB 210925A: GECAM detection
  46. GRB 210925A: Fermi GBM Final Real-time Localization
  47. GRB 210924A: Fermi GBM Final Real-time Localization
  48. IceCube-210922A: No Candidate Counterparts from Swift/XRT follow up observations
  49. IceCube-210922A: No significant detection in HAWC
  50. IceCube-210922A: No neutrino counterpart candidates in ANTARES search
  51. GRB 210923B: GECAM detection
  52. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 September 22
  53. GRB 210923A: Fermi GBM Final Real-time Localization
  54. GRB 210919A: Swift-BAT refined analysis
  55. IceCube-210922A - IceCube observation of a high-energy neutrino candidate track-like event
  56. GRB 210919A: Lowell Discovery Telescope upper limits (correction to GCN 30859)
  57. GRB 210919A: Swift/UVOT Upper Limits
  58. GRB 210919A: MITSuME Akeno optical upper limits
  59. GRB 210919A: Swift-XRT refined Analysis
  60. GRB 210919B: Fermi GBM Final Real-time Localization
  61. GRB 210919A: AbAO optical upper limit
  62. GRB 210919A: Enhanced Swift-XRT position
  63. GRB 210919A: LCO Optical Upper Limit
  64. GRB 210919A: BOOTES-2/TELMA optical upper limit
  65. Swift GRB 210919A: Global MASTER-Net observations report
  66. GRB 210919A: Swift detection of a short burst
  67. Swift trigger 1073821: detection of IGR J16418-4532
  68. GRB 210912A: BOOTES-5/JGT optical afterglow candidate (Correction to GCNC 30823)
  69. GRB 210917A: Fermi GBM Final Real-time Localization
  70. GRB 210909A: Detection by GRBAlpha
  71. GRB 210912A: Swift-BAT refined analysis
  72. GRB 210912A: CAHA 2.2m Detection
  73. GRB 210912A: Swift-XRT refined Analysis
  74. GRB 210912A: Swift/UVOT Detection
  75. GRB 210912A: Enhanced Swift-XRT position
  76. GRB 210912A: Host-galaxy candidate in PanSTARRS
  77. Swift GRB 210912A: Global MASTER-Net observations report
  78. GRB 210912A: BOOTES-5/JGT optical afterglow candidate
  79. GRB 210912B: Fermi GBM Final Real-time Localization
  80. GRB 210912A: Swift detection of a burst
  81. Swift GRB210910.42: Global MASTER-Net observations report
  82. Konus-Wind detection of the second intermediate flare from SGR 1935+2154
  83. IPN triangulation of a bright burst from SGR 1935+2154
  84. GRB 210826A: further Swift-XRT observations
  85. GRB 210909B: GECAM detection
  86. Swift detection of a burst from SGR Swift J1555.2-5402
  87. GRB 210909A: Fermi GBM Final Real-time Localization
  88. GRB 210905A: Swift/UVOT Upper Limits
  89. GRB 210905A: ATCA detection
  90. GRB 210905A: ALMA detection
  91. GRB 210905A: AstroSat CZTI detection
  92. GRB 210905A, GROND observations
  93. Konus-Wind detection of GRB 210905A
  94. Fermi GBM Sub-Threshold Detection of GRB 210905A
  95. GRB 210905A: Swift-XRT refined Analysis
  96. GRB 210827B: GECAM detection
  97. GRB 210905A: DECam Detection
  98. GRB 210905A: REM NIR afterglow detection
  99. GRB 210905A: VLT/X-shooter spectroscopic redshift
  100. GRB 210905A: Continued LCO Optical Observations

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