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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"

12178 results found.

  1. Integral GRB210829.14: Global MASTER-Net observations report
  2. GRB 210826A: AstroSat CZTI detection
  3. Fermi GRB 210827A: Global MASTER-Net observations report
  4. Fermi GRB 210827B: Global MASTER-Net observations report
  5. POLAR detection of a SGR-like burst
  6. GRB 210826A: Fermi-LAT detection
  7. GRB 210824A: MITSuME Akeno optical upper limits
  8. GRB 210822A: TSHAO continued optical observation
  9. GRB 210822A: VLA detection
  10. GRB 210822A: TSHAO optical observation
  11. Swift detection of an outburst from SGR Swift J1555.2-5402
  12. GRB 210824A: Swift-XRT refined Analysis
  13. GRB 210824A: Swift detection of a burst
  14. GRB 210822A: GECAM refined analysis
  15. Konus-Wind detection of GRB 210822A
  16. GRB 210822A: AstroSat CZTI detection
  17. GRB 210822A: Swift-BAT refined analysis
  18. GRB 210820A: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  19. GRB 210822A: Fermi-LAT detection
  20. Fermi GRB 210822B: Global MASTER-Net observations report
  21. GRB 210822A: KAIT Optical Afterglow Confirmation
  22. GRB 210820A: LCO Optical Upper Limit
  23. GRB 210820A: Nanshan/NEXT optical upper limit
  24. GRB 210820A: Swift-XRT refined Analysis
  25. Swift GRB 210820A: Global MASTER-Net observations report
  26. GRB 210820B: Fermi GBM Final Localization
  27. Fermi trigger No 651110719: Global MASTER-Net observations report
  28. Konus-Wind detection of GRB 210818A
  29. GRB 210818A: AstroSat CZTI detection
  30. GRB 210818A: AGILE detection
  31. Fermi trigger No 650687034: Global MASTER-Net observations report
  32. Fermi-LAT Gamma-ray Observations of IceCube-210811A
  33. GRB 210807A: continued Assy, AbAO and Mondy observations
  34. SGR 1935+2154: SPI INTEGRAL observations on 2021 August 5
  35. GRB 210730A: Tautenburg observations
  36. GRB 210807A: Tautenburg observations
  37. IceCube Alert 210811.09: Global MASTER-Net observations report
  38. GRB 210807C: Swift-BAT refined analysis
  39. GRB 210610B: Assy optical observations
  40. Fermi GRB 210807C: Global MASTER-Net observations report
  41. Swift GRB210807.96: Global MASTER-Net observations report
  42. GRB 210807C: Swift detection of a burst
  43. Fermi GRB 210807B: Global MASTER-Net observations report
  44. Swift GRB210807.78: Global MASTER-Net observations report
  45. GRB 210807A: BOOTES-5/JGT optical afterglow detection
  46. GRB 210807A: Swift detection of a burst with an optical counterpart
  47. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 August 5
  48. IPN Triangulation of a bright burst from SGR 1935+2154
  49. Fermi trigger No 649814537: Global MASTER-Net observations report
  50. GRB 210802A: BOOTES-2/TELMA optical upper limit
  51. GRB 210802A: Fermi GBM detection
  52. GRB 210802A: Fermi-LAT detection
  53. Fermi trigger No 649627691: Global MASTER-Net observations report
  54. Swift GRB210731.62: Global MASTER-Net observations report
  55. GRB 210731A: MeerLICHT optical afterglow detection
  56. GRB210731A: Enhanced Swift-XRT position
  57. Swift GRB210731.93: Global MASTER-Net observations report
  58. Fermi-LAT Gamma-ray Observations of IceCube-210730A
  59. GRB 210730A: BOOTES-5/JGT and 2.2m CAHA telescopes optical limit
  60. Fermi trigger No 649390368: Global MASTER-Net observations report
  61. GRB 210730A: AstroSat CZTI detection
  62. GRB 210730A: Swift-XRT refined Analysis
  63. GRB 210727A: AstroSat CZTI detection
  64. GRB 210726A: Deep CAHA 2.2m limit
  65. GRB 210714A: Fermi GBM observation
  66. GRB 210726A: Swift-XRT refined Analysis
  67. GRB 210727A: AGILE/MCAL detection
  68. GRB 210726A: CAHA 2.2m telescope optical limit
  69. GRB 210726A: Swift detection of a burst
  70. Swift GRB210726.80: Global MASTER-Net observations report
  71. Fermi trigger No 648959581: Global MASTER-Net observations report
  72. GRB 210725B: Swift-XRT refined Analysis
  73. GRB 210724A: Zeiss-1000 of Koshka observatory, optical upper limit
  74. GRB 210725A: Swift-XRT refined Analysis
  75. GRB 210724A: Swift-XRT refined Analysis
  76. GRB 210722A: continued Assy optical observations
  77. GRB 210722A: Nanshan/NEXT further optical observations
  78. Fermi trigger No 648868114: Global MASTER-Net observations report
  79. GRB 210725A: Swift detection of a burst
  80. GRB210724A: MeerLICHT upper limits
  81. GRB 210724A: Swift detection of a burst
  82. Swift GRB210724.84: Global MASTER-Net observations report
  83. GRB 210722A: continued Assy optical observations
  84. GRB 210722A: D50 optical detection
  85. GRB 210722A: Fermi GBM observation
  86. GRB 210722A: Swift-BAT refined analysis
  87. GRB 210722A: Kitab optical observations, light curve
  88. GRB 210723A: Swift detection of a burst
  89. GRB 210722A: Swift-XRT refined Analysis
  90. GRB 210722A: Swift/UVOT Detection
  91. GRB 210722A: GIT optical detection and preliminary analysis
  92. GRB 210702A: ALMA detection of mm-band rebrightening
  93. GRB 210722A: Assy optical detection
  94. GRB 210722A: Nanshan/NEXT optical afterglow observations
  95. GRB 210722A: Swift detection of a burst with a bright optical counterpart
  96. Fermi trigger No 648602917: Global MASTER-Net observations report
  97. Fermi-LAT Gamma-ray Observations of IceCube-210717A
  98. Fermi trigger No 648278666: Global MASTER-Net observations report
  99. Konus-Wind detection of GRB 210714A
  100. Fermi trigger No 648033323: Global MASTER-Net observations report

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