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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"

12170 results found.

  1. GECAM detection of a short burst from SGR J1935+2154
  2. GRB 210712A: Swift detection of a burst
  3. GRB 210709A: AstroSat CZTI detection
  4. Fermi trigger No 647653174: Global MASTER-Net observations report
  5. GRB 210704A: Assy optical afterglow upper limit
  6. Fermi trigger No 647641569: Global MASTER-Net observations report
  7. Fermi trigger No 647624281: Global MASTER-Net observations report
  8. GECAM detection of a short burst from SGR J1935+2154
  9. GECAM detection of a short burst from SGR 1935+2154
  10. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 7
  11. GECAM detection of a short burst from SGR 1935+2154
  12. GRB 210707A: A long GRB detected by INTEGRAL
  13. GRB 210704A: CAHA 2.2m telescope optical limit
  14. Fermi trigger No 647365516: Global MASTER-Net observations report
  15. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 6
  16. Fermi GBM Observations of SGR J1935+2154
  17. Swift-BAT detection of a burst from SGR 1935+2154
  18. GRB 210706A: optical upper limit of Sintesz-Newton/CrAO and AS-32/AbAO
  19. Konus-Wind detection of GRB 210706A
  20. GECAM detection of a bright short burst from SGR 1935+2154
  21. Integral GRB210707.02: Global MASTER-Net observations report
  22. INTEGRAL detection of a burst from SGR 1935+2154
  23. Konus-Wind detection of GRB 210704A
  24. GRB 210704B: AstroSat CZTI detection
  25. GRB 210704A: Assy optical afterglow candidate
  26. GRB 210704A: AstroSat CZTI detection
  27. IceCube-210516A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  28. GRB 210704A: Fermi-LAT detection
  29. Fermi trigger No 647108723: Global MASTER-Net observations report
  30. Fermi trigger No 647120009: Global MASTER-Net observations report
  31. Konus-Wind detection of GRB 210702A
  32. GRB 210702A: AGILE detection
  33. GRB 210619B: JCMT SCUBA-2 sub-mm observations
  34. GRB 210702A: VLT/X-shooter redshift
  35. Swift GRB 210702A: Global MASTER-Net observations report
  36. Swift GRB210702.80: Global MASTER-Net OT detection
  37. IceCube-210629A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  38. Fermi-LAT Gamma-ray Observations of IceCube-210629A
  39. GRB 210627B: GECAM detection
  40. IceCube Alert 210629.76: Global MASTER-Net observations report
  41. GRB 210619B: Sayan observatory 1.6-m telescope observations
  42. GRB 210626A: CAHA 2.2m telescope optical limit
  43. GRB 210619B: Deep CAHA 2.2m detection and late-time light curve behavior
  44. Fermi GRB 210627B: Global MASTER-Net observations report
  45. GRB 210627B: BALROG localization (Fermi Trigger 646509445/ GRB 210627748)
  46. GRB 210627B: Fermi GBM Final Real-time Localization
  47. Fermi GRB 210627A: Global MASTER-Net observations report
  48. Fermi GRB 210626A: Global MASTER-Net observations report
  49. GRB 210626A: Swift/BAT-GUANO detection and arcminute localization
  50. Fermi trigger No 646189108: Global MASTER-Net observations report
  51. Fermi GBM observation of a bright burst in the direction of SGR 1935+2154
  52. GRB 210619B: Mini-MegaTORTORA early optical observations
  53. GRB 210619B: possibility of lensed visible afterglow?
  54. Swift Trigger 1057131: detection of a burst from SGR Swift J1555.2-5402
  55. Swift GRB210621.71: Global MASTER-Net observations report
  56. GRB 210619B: 1.5m OSN optical observation
  57. GRB 210619B: iTelescope optical afterglow observation
  58. GRB 210619B: SAO RAS optical observations
  59. GRB 210619B: REM optical/NIR afterglow detection
  60. GRB 210619B: Liverpool Telescope First Hour Observations
  61. GRB 210619B: Swift/UVOT Detection
  62. Konus-Wind detection of GRB 210619B
  63. GRB 210619B: CAHA 2.2m photometric monitoring
  64. GRB 210619B: Liverpool Telescope r'-band observations
  65. GRB 210619B: Liverpool telescope imaging of a red afterglow
  66. GRB 210619B: Fermi-LAT detection
  67. GRB 210619B: SARA-KP 0.9m Optical Afterglow Detection
  68. Fermi trigger No 645857659: Global MASTER-Net observations report
  69. GRB 210619B: iTelescope T18 detection
  70. Swift GRB210619.99: Global MASTER-Net OT detection
  71. Swift GRB210619.99: Global MASTER-Net observations report
  72. Swift GRB210619.99: Global MASTER-Net OT detection
  73. Swift GRB210618.07: Global MASTER-Net observations report
  74. GRB 210610B: CrAO/ZTSH continued optical observations and light curve
  75. Fermi trigger No 645485036: Global MASTER-Net observations report
  76. Fermi GRB 210615A: Global MASTER-Net observations report
  77. Swift ToO Observations of HAWC transient J0020+3108
  78. GRB 210610B: iTelescope optical afterglow observations
  79. GRB 210610B: Further SAO RAS optical observations
  80. GRB 210610A: SAO RAS optical observations
  81. GRB 210610B: optical observations from Burke-Gaffney Observatory and Abbey Ridge Observatory
  82. GRB 210610B: optical photometry of afterglow at INASAN/Simeiz
  83. GRB 210607C: AstroSat CZTI detection
  84. GRB210610B: SARA-KP 0.9m Optical Afterglow Detection
  85. GRB 210610B: MITSuME Akeno optical observation
  86. GRB 210610B: CrAO/ZTSH optical observations and light curve
  87. GRB 210610B: Swift-XRT refined Analysis
  88. GRB 210610B: optical afterglow observations
  89. GRB 210610B: University of Siena Observatory optical photometry of the afterglow
  90. Konus-Wind detection of GRB 210610A
  91. Konus-Wind detection of GRB 210610B
  92. GRB 210610B: AGILE detection
  93. GRB 210610B: Redshift confirmation from GTC
  94. GRB 210610A: Swift-XRT refined Analysis
  95. GRB 210610B: SAO RAS optical observations
  96. Fermi trigger No 645047470: Global MASTER-Net observations report
  97. GRB 210610B: CrAO/ZTSh optical afterglow photometry
  98. GRB 210610B: BOOTES-2/TELMA optical observation
  99. Swift GRB 210610B: Global MASTER-Net observations report
  100. GRB 210610B: CrAO/ZTSh optical observations

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