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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

"200205A/SWIFT J0840.7-3516" does not adhere to advanced search syntax. Please refer to the documentation and try again.
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').
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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

19593 results found.

  1. GRB 220511A: AstroSat CZTI detection
  2. GRB 220511A: BOOTES-2/TELMA optical upper limit
  3. GRB 220511A: Swift ToO observations
  4. GRB 220511A: Swift/BAT-GUANO arcminute localization
  5. GRB 220506A: GIT optical upper limit.
  6. GRB 220506A: BOOTES-5/JGT optical upper limit
  7. GRB 220506A: Swift-XRT afterglow detection
  8. GRB 220506A: Tiled Swift observations
  9. Swift-BAT triggers 1105560-1 are not GRBs
  10. Swift GRB220506.51: Global MASTER-Net observations report
  11. GRB 220430A: Nanshan/NEXT optical upper limit
  12. GRB 220430A: Nanshan/HMT optical upper limit
  13. GRB 220430A: GIT optical upper limits
  14. IPN triangulation of GRB 220423A
  15. GRB 220427A: LCO Optical Observations
  16. GRB 220501A: Swift-BAT refined analysis
  17. GRB 220427A: GRANDMA Early Optical Afterglow Detection
  18. GRB 220501A: BOOTES-1 optical upper limit
  19. GRB 220501A: Fermi GBM observation
  20. GRB 220430A: AstroSat CZTI detection
  21. GRB 220501A: Swift detection of a burst
  22. GRB 220430A: Swift-BAT refined analysis
  23. GRB 220430A: CAHA 2.2m telescope optical limit
  24. GRB 220430A: Swift-XRT refined Analysis
  25. Swift GRB 220430A: Global MASTER-Net observations report
  26. GRB 220430A: GRANDMA observations
  27. GRB 220430A: Mondy and AbAO optical upper limits
  28. GRB 220430A: AGILE detection
  29. GRB 220430A: MeerLICHT optical upper limits
  30. GRB 220430A: Enhanced Swift-XRT position
  31. GRB 220430A: Swift detection of a burst or Swift J0630.4+0932
  32. GRB 220427A: Swift-BAT refined analysis
  33. GRB 220426A: Swift-XRT and UVOT observations
  34. GRB 220423A: Detection by VZLUSAT-2
  35. Konus-Wind detection of GRB 220427A
  36. GRB 220427A: Swift-XRT refined Analysis
  37. GRB 220427A: Enhanced Swift-XRT position
  38. GRB 220426A: Tiled Swift observations
  39. GRB 220427A: Swift detection of a burst with an optical counterpart
  40. Konus-Wind detection of GRB 220426A
  41. IPN triangulation of GRB 220426A
  42. GRB 220426C: Swift/BAT-GUANO detection outside the coded FOV (short)
  43. GRB 220426A: Swift/BAT-GUANO detection outside the coded FOV
  44. GRB 220423A: Swift/BAT-GUANO detection outside the coded FOV
  45. GRB 220421A: Fermi GBM observation
  46. GRB 220421A: Swift/BAT-GUANO detection outside the coded FOV
  47. GRB 220418B: Swift-XRT observations
  48. GRB 220418B Fermi GBM observation
  49. GRB 220420A: Swift/BAT-GUANO detection outside the coded FOV
  50. GRB 220403C: Further Swift-XRT observations
  51. GRB 220418B: Swift ToO observations
  52. GRB 220417A: Fermi GBM detection
  53. GRB 220418B: Swift/BAT-GUANO refined location of a short burst
  54. GRB 220418B: Swift/BAT-GUANO candidate arcminute localization of a short burst
  55. GRB 220417A: Swift/BAT-GUANO detection outside the coded FOV
  56. GRB 220412B: Swift/UVOT Upper Limits
  57. GRB 220412B: Swift-BAT refined analysis
  58. Konus-Wind detection of GRB 220412B
  59. GRB 220412B: Fermi GBM observation
  60. Konus-Wind detection of GRB 220403C
  61. GRB 220412A: GRANDMA observations
  62. GRB 220412A: BOOTES-network optical upper limits
  63. GRB 220412B: BOOTES-1 optical upper limit
  64. GRB 220412A: Swift-BAT refined analysis
  65. GRB 220412B: Swift-XRT observations
  66. IPN triangulation of short/soft GRB 220406A
  67. Swift GRB 220412B: Global MASTER-Net observations report
  68. GRB 220408A: HCT optical upper limit
  69. GRB 220412B: GIT optical upper limit
  70. GRB 220412A: MITSuME Akeno optical upper limits
  71. Correction to GCN 31888: GRB 220412A: Swift-XRT refined Analysis
  72. GRB 220412B: MITSuME Akeno optical upper limits
  73. GRB 220412A: Swift-XRT refined Analysis
  74. GRB 220412A: Enhanced Swift-XRT position
  75. GRB 220412B: Swift detection of a short burst
  76. GRB 220412A: Swift/UVOT Upper Limits
  77. GRB 220408A: GRANDMA observations
  78. GRB 220412A: RATIR Afterglow Candidate
  79. GRB 220412A: Swift detection of a burst
  80. Swift GRB220412.28: Global MASTER-Net observations report
  81. IPN triangulation of GRB 220403C
  82. GRB 220403B: Swift/UVOT Detection
  83. GRB 220408A: Swift-BAT refined analysis
  84. GRB 220408A: RATIR Optical and NIR Observations
  85. GRB 220403B: 1.3m DFOT Optical upper limit
  86. GRB 220408A: 1.3m DFOT Optical upper limit
  87. GRB 220403C: Swift-XRT observations
  88. GRB 220408A: redshift lower limit estimating
  89. GRB 220408A: NOT optical observations and archival detection
  90. GRB 220408A: LCO Optical Afterglow Detection
  91. GRB 220408A: Swift-XRT refined Analysis
  92. GRB 220403C: Swift ToO observations
  93. GRB 220408A: BOOTES-5/JGT optical afterglow detection
  94. GRB 220408A: GIT optical upper limit
  95. GRB 220408A: Fermi GBM observation
  96. GRB 220408A: Swift/UVOT Detection
  97. GRB 220408A: Xinglong-2.16m optical upper limit
  98. GRB 220408A: Enhanced Swift-XRT position
  99. GRB 220408A: KAIT Optical Observations
  100. GRB 220408A: Swift detection of a burst with an optical counterpart, possibly associated with M51

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