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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"

21109 results found.

  1. GRB 221009A: NOEMA mm detection
  2. Integral GRB221010.89: Global MASTER-Net observations report
  3. Fermi trigger No 687077239: Global MASTER-Net observations report
  4. GRB 221009A: Continued Swift/XRT observations
  5. GRB 221009A/Swift J1913.1+1946: Assy optical afterglow observation
  6. GRB 221009A/Swift J1913.1+1946: Lick/Nickel telescope optical observations
  7. GRB 221009A: Lulin SLT-40cm optical observations
  8. GRB 221009A (Swift J1913.1+1946): Burke-Gaffney Observatory optical observations
  9. GRB221009A/Swift J1913.1+1946: INTEGRAL SPI/ACS observations
  10. GRB 221009A: Fermi-LAT refined analysis
  11. GRB 221009: Swift/UVOT Detection
  12. GRB221009A/Swift J1913.1+1946: ATA follow-up observations
  13. GRB 221009A or Swift J1913.1+1946: PRIME near-infrared detection
  14. GRB 221009A/Swift J1913.1+1946: AMI-LA observations
  15. GRB 221009A: REM optical and NIR detection of the afterglow
  16. Swift J1913.1+1946: Early Optical Photometry
  17. GRB 221009A: Redshift from X-shooter/VLT
  18. GRB 221009A: Nanshan/NEXT photometry and Xinglong-2.16m spectroscopy
  19. GRB 221009A (Swift J1913.1+1946): MeerLICHT observations
  20. GRB 221009A (Swift J1913.1+1946): Mondy optical observations
  21. GRB 221009A BOOTES-2/TELMA and OSN optical detections
  22. Swift J1913.1+1946: Optical photometry
  23. Fermi trigger No 687014224: Global MASTER-Net observations report
  24. Swift J1913.1+1946: Liverpool Telescope imaging and spectroscopy
  25. GRB 221008A: Swift-XRT observations
  26. GRB 221008A: Tiled Swift observations
  27. GRB 220915A: Detection by GRBAlpha
  28. GRB 221006A: Swift-XRT observations
  29. GRB 221006A: Tiled Swift observations
  30. Fermi trigger No 686588176: Global MASTER-Net observations report
  31. GRB220927A: Detection by GRBAlpha
  32. GRB 220921A: ATCA detection of radio counterpart
  33. Fermi trigger No 686403226: Global MASTER-Net observations report
  34. Fermi trigger No 686350260: Global MASTER-Net observations report
  35. GRB 220930A: Swift/UVOT Upper Limits
  36. Swift GRB 220930A: Global MASTER-Net observations report
  37. Fermi-LAT gamma-ray observations of IceCube-220928A
  38. Fermi GRB 220927A: Global MASTER-Net observations report
  39. GRB 220921A: LCOGT Optical Observations
  40. GRB 220611A: Host galaxy redshift from VLT/X-shooter
  41. Integral GRB220926.44: Global MASTER-Net observations report
  42. Swift GRB220926.34: Global MASTER-Net observations report
  43. Swift GRB 220926A: Global MASTER-Net observations report
  44. Fermi GRB 220925A: Global MASTER-Net observations report
  45. GRB 220921A: further MeerLICHT observations
  46. Fermi trigger No 685748699: Global MASTER-Net observations report
  47. Swift GRB220923.47: Global MASTER-Net observations report
  48. GRB 220921A: ALMA detection
  49. GRB 220921A: DDOTI Detection of the Afterglow
  50. IceCube-220907A: Classification of AT2022oyn as a Type Ia supernova
  51. GRB 220921A: MeerLICHT afterglow observations
  52. GRB 220921A: Swift-XRT Observations
  53. GRB 220921A: MASTER OT inside Fermi-LAT error-box
  54. LAT GRB220921.46: Global MASTER-Net observations report
  55. GRB 220921A: Tiled Swift observations
  56. Fermi trigger No 685452089: Global MASTER-Net observations report
  57. Fermi-LAT gamma-ray observations of IceCube-220918A and detection of a new gamma-ray source, Fermi J0502.5+0037
  58. IceCube Alert 220918.53: Global MASTER-Net observations report
  59. Fermi trigger No 684894705: Global MASTER-Net observations report
  60. Fermi trigger No 684927323: Global MASTER-Net observations report
  61. Fermi trigger No 684911625: Global MASTER-Net observations report
  62. Fermi trigger No 684716840: Global MASTER-Net observations report
  63. Fermi GRB 220912A: Global MASTER-Net observations report
  64. GRB 220831A: DECam optical counterpart follow-up
  65. GRB 220909A: Swift-XRT observations
  66. GRB 220909A: Swift ToO observations
  67. GRB 220909A: Swift/BAT-GUANO candidate arcminute localization
  68. GRB 220831A: Gemini-South Infrared Observations
  69. IceCube-220907A: One Candidate Counterpart from the Zwicky Transient Facility
  70. GRB 220831A: Gemini-South/GMOS detection of potential optical counterpart
  71. GRB 220907A: Swift/UVOT Upper Limits
  72. GRB 220831A: ATCA 5/9 GHz radio observations
  73. Fermi-LAT Gamma-ray Observations of IceCube-220907A
  74. Swift GRB220907.59: Global MASTER-Net observations report
  75. IceCube Alert 220907.28: Global MASTER-Net observations report
  76. GRB 220831A: Swift-UVOT Upper Limits
  77. Fermi GRB 220905A: Global MASTER-Net observations report
  78. Fermi GRB 220902A: Global MASTER-Net observations report
  79. GRB 220831A, VLT/HAWK-I near-infrared observations
  80. GRB 220831A: Swift-XRT observations
  81. GRB 220831A: Swift ToO observations
  82. Fermi trigger No 683654200: Global MASTER-Net observations report
  83. GRB 220831A: Swift/BAT-GUANO localization of a short burst
  84. Fermi trigger No 683646997: Global MASTER-Net observations report
  85. Fermi trigger No 683537972: Global MASTER-Net observations report
  86. Fermi trigger No 683476673: Global MASTER-Net observations report
  87. IceCube-220822A: Classification of AT2022saw as a Type Ia supernova
  88. Fermi trigger No 683202084: Global MASTER-Net observations report
  89. Fermi trigger No 683183601: Global MASTER-Net observations report
  90. Fermi trigger No 683152759: Global MASTER-Net observations report
  91. GRB 220826A: Swift/UVOT Detection
  92. GRB 220826A: iTelescope optical afterglow observations
  93. Swift GRB 220826A: Global MASTER-Net observations report
  94. IceCube-220822A: One Candidate Counterpart from the Zwicky Transient Facility
  95. Fermi-LAT gamma-ray observations of IceCube-220822A and detection of a new gamma-ray source, Fermi J1810.1+2154
  96. Fermi trigger No 682918137: Global MASTER-Net observations report
  97. IceCube Alert 220822.85: Global MASTER-Net observations report
  98. GRB 220813A: VLT optical observations and possible host galaxy
  99. GRB 220813A: Swift/UVOT Detection
  100. GRB 220810A: Further Swift-XRT observations

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