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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"

19615 results found.

  1. IPN triangulation of GRB 220403C
  2. GRB 220403B: Swift/UVOT Detection
  3. GRB 220408A: Swift-BAT refined analysis
  4. GRB 220408A: RATIR Optical and NIR Observations
  5. GRB 220403B: 1.3m DFOT Optical upper limit
  6. GRB 220408A: 1.3m DFOT Optical upper limit
  7. GRB 220403C: Swift-XRT observations
  8. GRB 220408A: redshift lower limit estimating
  9. GRB 220408A: NOT optical observations and archival detection
  10. GRB 220408A: LCO Optical Afterglow Detection
  11. GRB 220408A: Swift-XRT refined Analysis
  12. GRB 220403C: Swift ToO observations
  13. GRB 220408A: BOOTES-5/JGT optical afterglow detection
  14. GRB 220408A: GIT optical upper limit
  15. GRB 220408A: Fermi GBM observation
  16. GRB 220408A: Swift/UVOT Detection
  17. GRB 220408A: Xinglong-2.16m optical upper limit
  18. GRB 220408A: Enhanced Swift-XRT position
  19. GRB 220408A: KAIT Optical Observations
  20. GRB 220408A: Swift detection of a burst with an optical counterpart, possibly associated with M51
  21. GRB 220403B: 1.5m OSN optical observation
  22. GRB 220404A: Swift-BAT refined analysis
  23. GRB 220403B: Swift-BAT refined analysis
  24. GRB 220403B: Fermi GBM detection
  25. GRB 220404A: Swift detection of a burst
  26. GRB 220403B: Swift-XRT refined Analysis
  27. Swift GRB 220403B: Global MASTER-Net observations report
  28. GRB 220403C (or A): Swift/BAT-GUANO detection outside the coded FOV
  29. GRB 220403B: Nanshan/NEXT optical afterglow power-law decay
  30. GRB 220403A: Tautenburg observations
  31. GRB 220403B: optical detection by D50
  32. GRB 220403B: Swift detection of a burst with an optical counterpart
  33. GRB 220401A: Swift/BAT-GUANO detection outside the coded FOV
  34. Swift Trigger 1100848 is likely not a GRB
  35. Swift GRB220402.16: Global MASTER-Net observations report
  36. GRB 220325A: Swift/UVOT Upper Limits
  37. GRB 220325A: Swift-BAT refined analysis
  38. GRB 220325A: LCO Optical Upper Limits
  39. GRB 220325A: Swift-XRT refined Analysis
  40. GRB 220325A: 1.3m DFOT Optical upper limit
  41. Fermi GBM Sub-Threshold Detection of GRB 220325A
  42. GRB 220325A: Enhanced Swift-XRT position
  43. GRB 220325A: MASTER Global Robotic Net optical observations
  44. GRB 220325A: Swift detection of a burst
  45. GRB 220319A: Swift-BAT refined analysis
  46. GRB 220317A: Fermi GBM detection
  47. GRB 220319A: MITSuME Akeno optical upper limits
  48. GRB 220319A: LCO Optical Upper Limit
  49. GRB 220319A: Mondy optical uper limit
  50. GRB 220319A: Swift-XRT refined Analysis
  51. GRB 220319A: Enhanced Swift-XRT position
  52. GRB 220319A: MASTER Global Robotic Net optical observations
  53. GRB 220319A: Swift detection of a burst
  54. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  55. GRB 220306B: Swift/UVOT Upper Limits
  56. GRB 220310C: Fermi GBM observation
  57. GRB 210722A: TAROT Reunion observatory optical light curve
  58. GRB 210222B: TAROT Reunion observatory optical light curve
  59. GRB 201021C: TAROT Reunion observatory optical light curve
  60. GRB 220310C: Swift-XRT observations
  61. GRB 220310C: Swift ToO observations
  62. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  63. GRB 220306B: Nanshan/NEXT optical upper limit
  64. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, possible photometric evidence of SN
  65. Fermi GBM Detection of GRB 220308A
  66. GRB 220308A: AGILE detection
  67. GRB 220310A: Swift ToO observations
  68. Konus-Wind detection of GRB 220308A
  69. GRB 220308A: Swift/BAT-GUANO detection outside the coded FOV
  70. IPN triangulation of GRB 220308A (long / very bright)
  71. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  72. GRB 220306B: Tautenburg observations
  73. GRB 220304A Fermi GBM detection
  74. GRB 220306B: Swift-BAT refined analysis
  75. GRB 220306B: AbAO optical observations, possible afterglow candidate
  76. GRB 220306B: BOOTES-1 optical upper limit
  77. GRB 220306B: Swift-XRT refined Analysis
  78. GRB 220306B: Fermi GBM observation
  79. GRB 220306B: Enhanced Swift-XRT position
  80. Swift GRB 220306B: Global MASTER-Net observations report
  81. GRB 220305A: Swift-BAT refined analysis
  82. GRB 220306B: Swift detection of a burst
  83. Fermi GBM Sub-Threshold Detection of GRB 220305A
  84. GRB 220305A: Swift-XRT refined Analysis
  85. GRB 220305A: Enhanced Swift-XRT position
  86. IceCube-220303A: One X-ray counterpart from Swift/XRT follow up observations
  87. Swift GRB 220305A: Global MASTER-Net observations report
  88. GRB 220305A: Swift-XRT observations
  89. GRB 220305A: Swift detection of a burst
  90. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, SN signature search
  91. GRB 220302A: Swift/UVOT Upper Limits
  92. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  93. GRB 220302A: Swift-XRT refined Analysis
  94. GRB 220302A: BOOTES-5/JGT optical upper limit
  95. Swift resumes autonomous slewing
  96. GRB 220302A: Enhanced Swift-XRT position
  97. GRB 220302A: Swift afterglow detection
  98. GRB 220222A: CALET Gamma-Ray Burst Monitor detection
  99. Swift GRB 220302A: Global MASTER-Net observations report
  100. GRB 220302A: Swift detection of a burst

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