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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"

14980 results found.

  1. IPN triangulation of GRB 210727A (short)
  2. Fermi GBM Sub-Threshold Detection of GRB 210726A
  3. GRB 210702A: MeerKAT radio detection
  4. GRB 210727A: AGILE/MCAL detection
  5. GRB 210725A: AbAO optical upper limit
  6. GRB 210726A: CAHA 2.2m telescope optical limit
  7. GRB 210726A: Swift detection of a burst
  8. GRB 210725A: Fermi GBM detection
  9. GRB 210725B: Swift detection of a burst
  10. GRB 210725A: CALET Gamma-Ray Burst Monitor detection
  11. GRB 210723A: CALET Gamma-Ray Burst Monitor detection
  12. GRB 210725A: Swift detection of a burst
  13. GRB210724A: MeerLICHT upper limits
  14. GRB 210724A: Swift detection of a burst
  15. GRB 210722A: D50 optical detection
  16. GRB 210722A: Redshift from OSIRIS/GTC
  17. GRB 210723A: Swift detection of a burst
  18. GRB 210722A: Swift/UVOT Detection
  19. GRB 210722A: GIT optical detection and preliminary analysis
  20. GRB 210702A: ALMA detection of mm-band rebrightening
  21. GRB 210722A: Assy optical detection
  22. GRB 210702A: ATCA detection of radio rebrightening
  23. GRB 210722A: Swift detection of a burst with a bright optical counterpart
  24. GRB 210719A: GECAM detection
  25. IceCube-210717A: IceCube observation of a high-energy neutrino candidate track-like event
  26. Konus-Wind detection of GRB 210714A
  27. Fermi trigger No 647942198: MASTER optical afterglow detection
  28. GECAM detection of a short burst from SGR J1935+2154
  29. GRB 210712A: BOOTES-3/YA optical upper limit
  30. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 10
  31. GECAM detection of a short burst from SGR J1935+2154
  32. GRB 210712A: Swift detection of a burst
  33. GRB 210709A: AstroSat CZTI detection
  34. GRB210704A: Gemini near-infrared upper limits
  35. GECAM detection of a short burst from SGR J1935+2154
  36. GRB 210704A: OSIRIS/GTC Observations and Archival Detection of the Possible Host Galaxy
  37. GRB 210704A: Gemini-North Infrared Source Detection
  38. GECAM detection of a short burst from SGR 1935+2154
  39. GRB 210709A: Fermi GBM Final Real-time Localization
  40. GRB 210702A: ATCA detection
  41. GRB 210702A: ALMA detection
  42. Fermi GBM Sub-Threshold Detection of GRB 210708A
  43. Fermi GBM Sub-Threshold Detection of GRB 210707A
  44. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 7
  45. GRB 210708B: Swift detection of a possible burst
  46. GECAM detection of a short burst from SGR 1935+2154
  47. GRB 210708A: Swift detection of a burst
  48. GRB 210704A: CAHA 2.2m telescope optical limit
  49. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 6
  50. Swift-BAT detection of a burst from SGR 1935+2154
  51. GRB 210706A: optical upper limit of Sintesz-Newton/CrAO and AS-32/AbAO
  52. Konus-Wind detection of GRB 210706A
  53. GRB 210704A: OAJ T80 multi-color detections
  54. GECAM detection of a bright short burst from SGR 1935+2154
  55. GRB 210706A: Swift-XRT afterglow detection
  56. INTEGRAL detection of a burst from SGR 1935+2154
  57. GRB 210706A: Swift/BAT-GUANO detection and arcminute localization
  58. GRB 210704A: OSIRIS/GTC spectroscopy
  59. GRB 210704A: CAHA 2.2m Afterglow Detection
  60. Konus-Wind detection of GRB 210704A
  61. GRB 210704B: AstroSat CZTI detection
  62. GRB 210619B: ALMA detection
  63. GRB 210704A: TNG detection of the optical afterglow candidate
  64. GRB 210704B: Fermi GBM detection
  65. GRB 210704A: Fermi GBM detection
  66. GRB 210704A: Swift-XRT afterglow detection
  67. GRB 210704A: AstroSat CZTI detection
  68. GRB 210704A: Fermi-LAT detection
  69. GRB 210705A: AGILE/MCAL detection of a burst
  70. GRB 210704A: AGILE/MCAL detection
  71. Konus-Wind detection of GRB 210702A
  72. GRB 210702A: AGILE detection
  73. GRB 210702A: CALET Gamma-Ray Burst Monitor detection
  74. GRB 210702A: VLT/X-shooter redshift
  75. GRB210702A: MeerLICHT multi-colour photometry
  76. Swift GRB210702.80: Global MASTER-Net OT detection
  77. GRB 210702A: Swift detection of a burst with a bright optical counterpart
  78. GRB 210627B: GECAM detection
  79. IceCube-210629A - IceCube observation of a high-energy neutrino candidate track-like event
  80. GRB 210626A: CAHA 2.2m telescope optical limit
  81. GRB 210619B: Deep CAHA 2.2m detection and late-time light curve behavior
  82. GRB 210627B: Fermi GBM Final Real-time Localization
  83. GRB 210627A: Fermi GBM Final Real-time Localization
  84. GRB 210626A: Swift-XRT afterglow detection
  85. GRB 210626A: Swift/BAT-GUANO detection and arcminute localization
  86. GRB 210626A: Fermi GBM Final Real-time Localization
  87. GRB 210618A: 1.5m OSN optical upper limit
  88. GRB210619B: optical afterglow detection from Konkoly Observatory
  89. GRB 210625A: Fermi GBM Final Real-time Localization
  90. GRB 210610B: T-CAT optical observations
  91. GRB 210619B: ASIM observation
  92. GRB 210618A: Swift-XRT afterglow detection
  93. GRB 210622A: Fermi GBM detection
  94. GRB 210622A: Swift/BAT-GUANO detection and arcminute localization of a long burst
  95. GRB 210619B: possibility of lensed visible afterglow?
  96. GECAM detection of GRB 210622B
  97. GRB 210622B: Fermi GBM Final Real-time Localization
  98. GRB 210622A: Fermi GBM Final Real-time Localization
  99. Swift Trigger 1057131: detection of a burst from SGR Swift J1555.2-5402
  100. GRB 210619B: 1.5m OSN optical observation

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