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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.

Advanced Search Examples (click to copy):

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

19593 results found.

  1. GRB 181020A: Enhanced Swift-XRT position
  2. GRB 181020A: Fermi-LAT detection
  3. GRB 181020A: Swift detection of a burst with an optical counterpart
  4. Trigger 867343: Swift detection of SGR1806-20
  5. GRB 181016A: Swift-BAT refined analysis
  6. GRB 181016A: Swift detection of a burst
  7. GRB 181013A: AbAO optical upper limit
  8. Trigger 866993: Swift detection of SGR1806-20
  9. GRB 181013A: Swift/UVOT Upper Limits
  10. GRB 181013A: Swift-BAT refined analysis
  11. GRB 181013A: Swift-XRT afterglow detection
  12. GRB 181013A: Global MASTER Net optical observations
  13. GRB 181013A: Swift detection of a probable burst
  14. Swift Trigger 866757: is probably not a GRB
  15. GROND afterglow detection of GRB 181010A
  16. GRB 181010A: Swift-BAT refined analysis
  17. GRB 181010A: Fermi GBM observation
  18. IPN Triangulation of GRB 181008B (long)
  19. GRB 181010A: Swift/UVOT Detection
  20. GRB 181010A: Swift-XRT refined Analysis
  21. GRB 181010A: Enhanced Swift-XRT position
  22. GRB 181010A: LCO Cerro Tololo observations
  23. GRB 181010A: MASTER-Argentina OT detection
  24. GRB 181010A: Swift detection of a burst with an optical counterpart
  25. GRB 181002A: Mondy optical upper limit
  26. GRB 181003A: RATIR Optical and NIR Observations
  27. GRB 181003A: Swift-BAT refined analysis
  28. GRB 181003A: Swift-XRT afterglow detection
  29. GRB 180925A: Astrosat CZTI detection
  30. GRB 181003A: Swift/UVOT Upper Limits
  31. GRB 181002A: Swift-XRT refined Analysis
  32. GRB 181003A: LCO Cerro Tololo observations
  33. GRB 181003A: MASTER optical observation
  34. GRB181002A: GOTO optical limits
  35. GRB 181002A: Swift/UVOT Upper Limits
  36. GRB 181003A: Swift-XRT observations
  37. GRB 181003A: Swift detection of a burst
  38. GRB 181002A: Swift-BAT refined analysis
  39. GRB 181002A: MASTER optical observation
  40. GRB 181002A: Enhanced Swift-XRT position
  41. Konus-Wind observation of GRB 180925A
  42. GRB 181002A: Swift detection of a burst
  43. Trigger 864882: Swift detection of Crab in its normal state
  44. GRB 180930A: Swift-BAT refined analysis
  45. GRB 180930A: Swift-XRT refined Analysis
  46. GRB 180930A: Swift/UVOT Upper Limits
  47. GRB 180930A: Enhanced Swift-XRT position
  48. GRB 180930A: KAIT Optical Upper Limit
  49. GRB 180930A: Prompt enhanced Swift-XRT position
  50. GRB 180930A: Swift detection of a burst
  51. GRB 180924A: Swift/UVOT Upper Limits
  52. GRB 180925A: Insight-HXMT/HE detection
  53. GRB 180925A: Swift/UVOT Detection
  54. GRB 180925A: Swift-BAT refined analysis
  55. GRB 180925A: Swift-XRT refined Analysis
  56. GRB 180925A: Enhanced Swift-XRT position
  57. GRB 180925A: Prompt enhanced Swift-XRT position
  58. GRB 180925A: Swift detection of a burst
  59. GRB 180924A: MASTER inspection
  60. GRB 180924A: Swift-XRT refined Analysis
  61. GRB 180924A: Swift-BAT refined analysis
  62. GRB 180924A: Enhanced Swift-XRT position
  63. GRB 180924A: Swift detection of a burst
  64. Swift Trigger 863053 is not an astrophysical event
  65. GRB180914B: Swift UVOT position correction to circ. 23241
  66. GRB 180914B: AstroSat CZTI detection
  67. GRB 180914A: AstroSat CZTI detection
  68. GRB 180914B: AGILE/MCAL refined analysis
  69. GRB180914B: Swift UVOT detection of an optical afterglow
  70. GRB 180914B: RATIR Optical and NIR Observations
  71. GRB 180914B: KAIT Optical Afterglow Candidate
  72. GRB 180914B: Swift-XRT afterglow detection
  73. GRB 180914A: RATIR Optical and NIR Observations
  74. GRB 180914B: Tiled Swift observations
  75. GRB 180914B: Fermi-LAT detection
  76. GRB 180914A: Swift-XRT observations
  77. GRB 180914A: Tiled Swift observations
  78. GRB 180914A: Fermi-LAT detection
  79. GRB 180905A: Swift/UVOT Upper Limits
  80. GRB 180905A, Swift-BAT refined analysis
  81. GRB 180905A: RATIR Optical and NIR Observations
  82. GRB 180905A: Swift-XRT refined Analysis
  83. GRB 180904A: BOOTES-2/TELMA early observations
  84. GRB 180905A: BOOTES-3/YA optical observations
  85. GRB 180905A: Enhanced Swift-XRT position
  86. GRB 180904A: AbAO optical upper limit
  87. GRB 180904A: Swift/UVOT Upper Limits
  88. GRB 180904A: Swift-BAT refined analysis
  89. GRB 180905A: Swift detection of a burst
  90. GRB 180904A: Swift-XRT refined Analysis
  91. GRB 180904A: LT early observations
  92. GRB 180904A: SAO RAS optical observations
  93. GRB 180904A: OSN observations
  94. GRB 180904A: Enhanced Swift-XRT position
  95. GRB 180904A: Swift detection of a burst
  96. Konus-Wind observation of GRB 180828A
  97. GRB 180829A: Swift-XRT observations
  98. GRB 180828A: AstroSat CZTI detection
  99. GRB 180828A: Swift/UVOT Upper Limits
  100. GRB 180828A: RATIR Optical and NIR Observations

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