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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"

19662 results found.

  1. GRB 160910A: XRT results and corrections to GCN 19905 & 19906
  2. GRB 160910A: Tiled Swift observations
  3. GRB 160910A: Swift-XRT afterglow detection
  4. GRB 160910A: Fermi-LAT detection
  5. Konus-Wind observation of GRB 160905A
  6. GRB 160824A: 15 GHz upper limits from AMI
  7. GRB 160905A: Swift/UVOT Detection
  8. GRB 160905A: Swift-BAT refined analysis
  9. Swift Trigger 711158 is not an astrophysical event
  10. GRB 160905A: Swift-XRT refined Analysis
  11. GRB 160821A: 15 GHz upper limits from AMI
  12. GRB 160905A: Enhanced Swift-XRT position
  13. GRB 160905A: Fermi-LAT detection
  14. GRB 160905A: Fermi GBM observation
  15. GRB 160905A: Swift detection of a burst with an optical counterpart
  16. GRB 160829A: Swift-XRT observations
  17. GRB 160829A: Swift ToO observations
  18. GRB 160829A: Fermi-LAT detection of a short GRB
  19. GRB 160827A: Swift-BAT refined analysis
  20. Swift trigger 710022 is not astrophysical
  21. GRB 160827A: Swift detection of a burst
  22. Correction to Circular 19874 (on Swift trigger 71022)
  23. Swift Trigger 710022 is very likely noise
  24. GRB 160826A: Swift-BAT refined analysis
  25. GRB 160826A: Swift/UVOT Upper Limits
  26. GRB 160825A: not localized by Swift
  27. GRB 160826A: Swift-XRT refined Analysis
  28. GRB 160826A: Swift detection of a burst
  29. GRB 160821A: CALET Gamma-Ray Burst Monitor detection
  30. GRB 160825A: Swift ToO observations
  31. GRB 160824A: 1.5m OSN I-band observation
  32. GRB 160824A: Swift-BAT refined analysis
  33. GRB 160824A: Swift/UVOT Possible Afterglow Detection
  34. GRB 160824A: Bassano Bresciano Observatory upper limits
  35. GRB 160824A: Swift-XRT refined Analysis
  36. GRB 160824A: Enhanced Swift-XRT position
  37. GRB 160824A: Swift detection of a burst
  38. IPN Triangulation of GRB 160822A (short/hard)
  39. IPN Triangulation of GRB 160820A (short/hard)
  40. GRB 160821B: GTC follow-up observation
  41. GRB 160821B: Swift-BAT refined analysis
  42. GRB 160821B: Fermi GBM Detection
  43. Konus-Wind observation of GRB 160821A
  44. GRB 160821B: Swift-XRT refined Analysis
  45. GRB 160821A: Swift-BAT refined analysis
  46. GRB 160821B: Swift/UVOT Upper Limits
  47. Short GRB 160821B: MASTER early optical observations
  48. GRB 160821B: Enhanced Swift-XRT position
  49. GRB 160821A: Fermi-LAT refined analysis
  50. GRB 160821A: Fermi GBM Detection
  51. GRB 160821B: Swift detection of a short burst
  52. GRB 160821A: TAROT Calern observatory optical detection
  53. GRB 160821A: Fermi-LAT detection of a bright burst
  54. GRB 160821A: Swift detection of a bright burst
  55. BAT detection and localization of GRB 160819A
  56. GRB 160816A: MASTER OT early detection on coaded images
  57. GRB 160816A: Swift/UVOT Detection
  58. GRB 160816A: IPN annulus
  59. GRB 160804A: 15 GHz detections and upper limit from AMI
  60. GRB 160801A: 15 GHz upper limits from AMI
  61. GRB 160714A: 15 GHz upper limits from AMI
  62. GRB 160816A: RATIR Optical and NIR Observations
  63. GRB 160816A: LCOGT-FTN optical candidate
  64. GRB 160816A: Swift-XRT afterglow detection
  65. GRB 160816A: Swift ToO observations
  66. GRB 160816A: Fermi-LAT detection
  67. GRB 160815A: Swift/UVOT Detection
  68. GRB 160815A: Swift-BAT refined analysis
  69. GRB 160815A: Swift-XRT refined Analysis
  70. GRB 160815A: Fermi GBM detection/observation
  71. GRB 160815A: Enhanced Swift-XRT position
  72. GRB 160815A: Swift/UVOT Afterglow Detection
  73. GRB 160815A: Swift detection of a burst
  74. IPN Triangulation of GRB 160806A
  75. Swift Trigger 707517 is not an astrophysical event
  76. Swift Trigger 707545 is likely 4U 1850-03/GS1843-02
  77. Swift Trigger 707517 is probably not a GRB
  78. GRB 160804A: RATIR Optical and NIR Observations
  79. GRB 160804A: GROND observations
  80. GRB 160804A: Fermi GBM observation
  81. GRB160804A: MASTER-SAAO observation
  82. GRB 160804A: Swift-BAT refined analysis
  83. GRB 160804A: Swift/UVOT Detection
  84. GRB 160804A: Swift-XRT refined Analysis
  85. GRB 160804A: Enhanced Swift-XRT position
  86. GRB 160804A: Swift detection of a burst
  87. GRB 160801A: Swift/UVOT Upper Limits
  88. FACT follow-up of IceCube20160731
  89. GRB 160801A: Swift-XRT refined Analysis
  90. GRB 160801A: Swift-BAT refined analysis
  91. Global MASTER net follow up of IceCube-160731A
  92. Swift follow up of IceCube-160731A
  93. GRB 160801A: Enhanced Swift-XRT position
  94. GRB 160801A: Swift detection of a burst
  95. GRB 160716A: TAROT La Silla observatory optical observations
  96. GRB160709A: Astrosat CZTI detection of short GRB
  97. GRB160703A: Astrosat CZTI detection
  98. GRB 160705B: 15 GHz upper limits from AMI
  99. GRB 160703A: 15 GHz upper limits from AMI
  100. GBM observation of SGR-like burst from the direction of PSR 1119-6127

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