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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').
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"

19607 results found.

  1. GRB 220403C: Swift-XRT observations
  2. GRB 220408A: redshift lower limit estimating
  3. GRB 220408A: NOT optical observations and archival detection
  4. GRB 220408A: LCO Optical Afterglow Detection
  5. GRB 220408A: Swift-XRT refined Analysis
  6. GRB 220403C: Swift ToO observations
  7. GRB 220408A: BOOTES-5/JGT optical afterglow detection
  8. GRB 220408A: GIT optical upper limit
  9. GRB 220408A: Fermi GBM observation
  10. GRB 220408A: Swift/UVOT Detection
  11. GRB 220408A: Xinglong-2.16m optical upper limit
  12. GRB 220408A: Enhanced Swift-XRT position
  13. GRB 220408A: KAIT Optical Observations
  14. GRB 220408A: Swift detection of a burst with an optical counterpart, possibly associated with M51
  15. GRB 220403B: 1.5m OSN optical observation
  16. GRB 220404A: Swift-BAT refined analysis
  17. GRB 220403B: Swift-BAT refined analysis
  18. GRB 220403B: Fermi GBM detection
  19. GRB 220404A: Swift detection of a burst
  20. GRB 220403B: Swift-XRT refined Analysis
  21. Swift GRB 220403B: Global MASTER-Net observations report
  22. GRB 220403C (or A): Swift/BAT-GUANO detection outside the coded FOV
  23. GRB 220403B: Nanshan/NEXT optical afterglow power-law decay
  24. GRB 220403A: Tautenburg observations
  25. GRB 220403B: optical detection by D50
  26. GRB 220403B: Swift detection of a burst with an optical counterpart
  27. GRB 220401A: Swift/BAT-GUANO detection outside the coded FOV
  28. Swift Trigger 1100848 is likely not a GRB
  29. Swift GRB220402.16: Global MASTER-Net observations report
  30. GRB 220325A: Swift/UVOT Upper Limits
  31. GRB 220325A: Swift-BAT refined analysis
  32. GRB 220325A: LCO Optical Upper Limits
  33. GRB 220325A: Swift-XRT refined Analysis
  34. GRB 220325A: 1.3m DFOT Optical upper limit
  35. Fermi GBM Sub-Threshold Detection of GRB 220325A
  36. GRB 220325A: Enhanced Swift-XRT position
  37. GRB 220325A: MASTER Global Robotic Net optical observations
  38. GRB 220325A: Swift detection of a burst
  39. GRB 220319A: Swift-BAT refined analysis
  40. GRB 220317A: Fermi GBM detection
  41. GRB 220319A: MITSuME Akeno optical upper limits
  42. GRB 220319A: LCO Optical Upper Limit
  43. GRB 220319A: Mondy optical uper limit
  44. GRB 220319A: Swift-XRT refined Analysis
  45. GRB 220319A: Enhanced Swift-XRT position
  46. GRB 220319A: MASTER Global Robotic Net optical observations
  47. GRB 220319A: Swift detection of a burst
  48. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  49. GRB 220306B: Swift/UVOT Upper Limits
  50. GRB 220310C: Fermi GBM observation
  51. GRB 210722A: TAROT Reunion observatory optical light curve
  52. GRB 210222B: TAROT Reunion observatory optical light curve
  53. GRB 201021C: TAROT Reunion observatory optical light curve
  54. GRB 220310C: Swift-XRT observations
  55. GRB 220310C: Swift ToO observations
  56. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  57. GRB 220306B: Nanshan/NEXT optical upper limit
  58. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, possible photometric evidence of SN
  59. Fermi GBM Detection of GRB 220308A
  60. GRB 220308A: AGILE detection
  61. GRB 220310A: Swift ToO observations
  62. Konus-Wind detection of GRB 220308A
  63. GRB 220308A: Swift/BAT-GUANO detection outside the coded FOV
  64. IPN triangulation of GRB 220308A (long / very bright)
  65. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  66. GRB 220306B: Tautenburg observations
  67. GRB 220304A Fermi GBM detection
  68. GRB 220306B: Swift-BAT refined analysis
  69. GRB 220306B: AbAO optical observations, possible afterglow candidate
  70. GRB 220306B: BOOTES-1 optical upper limit
  71. GRB 220306B: Swift-XRT refined Analysis
  72. GRB 220306B: Fermi GBM observation
  73. GRB 220306B: Enhanced Swift-XRT position
  74. Swift GRB 220306B: Global MASTER-Net observations report
  75. GRB 220305A: Swift-BAT refined analysis
  76. GRB 220306B: Swift detection of a burst
  77. Fermi GBM Sub-Threshold Detection of GRB 220305A
  78. GRB 220305A: Swift-XRT refined Analysis
  79. GRB 220305A: Enhanced Swift-XRT position
  80. IceCube-220303A: One X-ray counterpart from Swift/XRT follow up observations
  81. Swift GRB 220305A: Global MASTER-Net observations report
  82. GRB 220305A: Swift-XRT observations
  83. GRB 220305A: Swift detection of a burst
  84. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, SN signature search
  85. GRB 220302A: Swift/UVOT Upper Limits
  86. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  87. GRB 220302A: Swift-XRT refined Analysis
  88. GRB 220302A: BOOTES-5/JGT optical upper limit
  89. Swift resumes autonomous slewing
  90. GRB 220302A: Enhanced Swift-XRT position
  91. GRB 220302A: Swift afterglow detection
  92. GRB 220222A: CALET Gamma-Ray Burst Monitor detection
  93. Swift GRB 220302A: Global MASTER-Net observations report
  94. GRB 220302A: Swift detection of a burst
  95. GRB 220228A: Fermi-LAT detection
  96. Konus-Wind detection of GRB 220222A
  97. IPN triangulation of GRB 220222A
  98. GCN Circ.draft on GRB 220222A
  99. GRB 220219B: Swift-XRT observations
  100. ZTF22aaajecp/AT2022cmc: Swift Observation and a UV Detection

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