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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"

28303 results found.

  1. GRB 160910A: Fermi GBM observation
  2. GRB 160905A: Swift/UVOT Detection
  3. GRB 160905A: Swift-BAT refined analysis
  4. Swift Trigger 711158 is not an astrophysical event
  5. GRB 160905A: Swift-XRT refined Analysis
  6. GRB 160905A: Enhanced Swift-XRT position
  7. GRB 160905A: Fermi GBM observation
  8. IceCube HESE 160814: MASTER OT J130845.02-323254.9 as the possible source of the high energy neutrino
  9. GRB 160905A: Swift detection of a burst with an optical counterpart
  10. Search for counterpart to IceCube-160814A with ANTARES
  11. GRB 160824B: Lomonosov BDRG gamma ray detection and MASTER limit
  12. GRB 160827A: Swift-BAT refined analysis
  13. Swift Trigger 710022 is very likely noise
  14. GRB 160826A: Swift-BAT refined analysis
  15. GRB 160826A: Swift/UVOT Upper Limits
  16. GRB 160825A: not localized by Swift
  17. GRB 160820A: Fermi GBM observation
  18. GRB 160826A: Swift-XRT refined Analysis
  19. GRB 160826A: Swift detection of a burst
  20. GRB 160824A: ISON/Terskol optical observations
  21. GRB 160824A: Swift-BAT refined analysis
  22. GRB 160824A: Swift/UVOT Possible Afterglow Detection
  23. GRB 160824A: Bassano Bresciano Observatory upper limits
  24. GRB 160824A: Swift-XRT refined Analysis
  25. GRB 160824A: Enhanced Swift-XRT position
  26. GRB 160824B: Fermi GBM detection
  27. GRB 160824A: Swift detection of a burst
  28. GRB 160821B: VLA 5.0 GHz observations
  29. IPN Triangulation of GRB 160822A (short/hard)
  30. IPN Triangulation of GRB 160820A (short/hard)
  31. GRB 160821B: GTC follow-up observation
  32. GRB 160822672: Fermi GBM detection
  33. GRB 160821B: Swift-BAT refined analysis
  34. GRB 160821B: Fermi GBM Detection
  35. GRB 160821B: Swift-XRT refined Analysis
  36. GRB 160821A: Swift-BAT refined analysis
  37. GRB 160821B: Swift/UVOT Upper Limits
  38. GRB 160821B: Enhanced Swift-XRT position
  39. GRB 160821A: Fermi-LAT refined analysis
  40. GRB 160821A: Fermi GBM Detection
  41. GRB 160821B: NOT optical afterglow candidate
  42. GRB 160821B: Swift detection of a short burst
  43. GRB 160821A: TAROT Calern observatory optical detection
  44. GRB 160816A: TSHAO optical observations
  45. INTEGRAL/SPI-ACS observation of IceCube HESE 128340 58537957
  46. BAT detection and localization of GRB 160819A
  47. GRB 160819A: Fermi GBM detection
  48. GRB 160816A: ISON/UAFO optical observations
  49. GRB 160816A: Further RATIR Optical and NIR Observations
  50. GRB 160816A: RATIR Optical and NIR Afterglow Confirmation
  51. GRB 160816A: confirmed fading with the LT
  52. GRB 160816A iTelescope observation
  53. Fermi GBM Observations of IceCube-160806A
  54. GRB 160814A: CALET Gamma-Ray Burst Monitor detection
  55. GRB 160816A: Swift/UVOT Detection
  56. GRB 160816A: RATIR Optical and NIR Observations
  57. GRB 160816A: Swift-XRT afterglow detection
  58. GRB 160816730A: Fermi GBM detection/observation
  59. GRB 160815A: Swift/UVOT Detection
  60. Konus-Wind observation of GRB 160814A
  61. GRB 160815A: Swift-BAT refined analysis
  62. GRB 160815A: Swift-XRT refined Analysis
  63. GRB 160815A: Fermi GBM detection/observation
  64. GRB 160815A: Enhanced Swift-XRT position
  65. GRB 160814A: MAXI/GSC detection
  66. IceCube 160806A: Lomonosov BDRG gamma ray prompt observations
  67. INTEGRAL/SPI-ACS and IBIS_VETO search for prompt gamma-ray counterpart of IceCube-160806A
  68. IceCube 160806A EHE Neutrino Candidate Event
  69. IPN Triangulation of GRB 160806A
  70. Swift Trigger 707517 is not an astrophysical event
  71. Swift Trigger 707545 is likely 4U 1850-03/GS1843-02
  72. Swift Trigger 707517 is probably not a GRB
  73. GRB 160804A: RATIR Optical and NIR Observations
  74. IceCube-160731A: Konus-Wind limits
  75. GRB 160804A: TSHAO optical observations
  76. GRB 160804A: ISON/UAFO optical observations
  77. GRB 160804A: GROND observations
  78. Search for counterpart to IceCube-160731A with ANTARES
  79. GRB 160804A: SAO RAS optical observations
  80. GRB 160804A: TNG optical observations, afterglow fading and candidate host galaxy
  81. GRB 160804A: Fermi GBM 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. IceCube-160731A: iPTF P48 Observations
  88. GRB 160801A: TSHAO optical observations
  89. GRB 160801A: Swift/UVOT Upper Limits
  90. GRB 160801A: SAO RAS optical observations
  91. GRB 160802A: Fermi GBM detection
  92. GRB 160801A: NOT upper limits
  93. FACT follow-up of IceCube20160731
  94. GRB 160801A: Swift-XRT refined Analysis
  95. GRB 160801A: Swift-BAT refined analysis
  96. Global MASTER net follow up of IceCube-160731A
  97. Swift follow up of IceCube-160731A
  98. GRB 160801A: Enhanced Swift-XRT position
  99. GRB 160801A: MITSuME Okayama upper limits
  100. GRB 160801A: Swift detection of a burst

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