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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"

12400 results found.

  1. GRB 161001A: GROND afterglow candidate
  2. GRB 161001A: Swift/UVOT Upper Limits
  3. GRB 161001A: Swift detection of a burst
  4. GRB 160927A: Swift/UVOT Upper Limits
  5. GRB 160927A: Bassano Bresciano Observatory optical upper limit
  6. GRB 160917A: 15 GHz upper limits from AMI
  7. GRB 160912A: 15 GHz upper limits from AMI
  8. XRT refined analysis for GRB 160925A
  9. GRB 160917A: RATIR Optical and NIR Observations
  10. GRB 160917A: OSN I-band upper limits
  11. GRB 160917A: Swift detection of a burst
  12. GRB 160912A: RATIR Optical and NIR Observations
  13. GRB 160912A: Swift/UVOT Weak Afterglow Detection
  14. GRB 160910A: Global MASTER Net OT detection before LAT alert
  15. GRB 160912A: Swift detection of a burst
  16. GRB 160824A: 15 GHz upper limits from AMI
  17. GRB 160821B: 15 GHz upper limits from AMI
  18. GRB 160905A: Swift/UVOT Detection
  19. GRB 160821A: 15 GHz upper limits from AMI
  20. GRB 160816A: Possible radio afterglow detection at 15 GHz with AMI
  21. IceCube HESE 160814: MASTER OT J130845.02-323254.9 as the possible source of the high energy neutrino
  22. Search for counterpart to IceCube-160814A with ANTARES
  23. GRB 160824B: Lomonosov BDRG gamma ray detection and MASTER limit
  24. GRB 160829A: Swift-XRT observations
  25. GRB 160826A: Swift/UVOT Upper Limits
  26. GRB 160825A: not localized by Swift
  27. GRB 160826A: Swift detection of a burst
  28. GRB 160824A: Swift/UVOT Possible Afterglow Detection
  29. GRB 160824A: Bassano Bresciano Observatory upper limits
  30. GRB 160824A: Swift detection of a burst
  31. Konus-Wind observation of GRB 160822A
  32. GRB 160821B: Swift/UVOT Upper Limits
  33. GRB 160821B: Swift detection of a short burst
  34. GRB 160816A: TSHAO optical observations
  35. INTEGRAL/SPI-ACS observation of IceCube HESE 128340 58537957
  36. GRB 160816A: RATIR Optical and NIR Afterglow Confirmation
  37. GRB 160816A iTelescope observation
  38. Fermi GBM Observations of IceCube-160806A
  39. GRB 160816A: Swift/UVOT Detection
  40. GRB 160804A: 15 GHz detections and upper limit from AMI
  41. GRB 160801A: 15 GHz upper limits from AMI
  42. GRB 160714A: 15 GHz upper limits from AMI
  43. Konus-Wind observation of GRB 160816A
  44. GRB 160815A: GWAC-F60A upper limit
  45. GRB 160816A: MASTER inspection
  46. GRB 160814A: MAXI/GSC detection
  47. IceCube 160806A: Lomonosov BDRG gamma ray prompt observations
  48. INTEGRAL/SPI-ACS and IBIS_VETO search for prompt gamma-ray counterpart of IceCube-160806A
  49. Konus-Wind observation of GRB 160806A
  50. Swift Trigger 707517 is not an astrophysical event
  51. Swift Trigger 707545 is likely 4U 1850-03/GS1843-02
  52. Swift Trigger 707517 is probably not a GRB
  53. GRB 160804A: RATIR Optical and NIR Observations
  54. IceCube-160731A: Konus-Wind limits
  55. GRB 160804A: VLT/X-shooter redshift
  56. Search for counterpart to IceCube-160731A with ANTARES
  57. GRB 160804A: Swift/UVOT Detection
  58. GBM Observations of IceCube 160731
  59. GRB 160801A: Swift/UVOT Upper Limits
  60. GRB 160801A: NOT upper limits
  61. Global MASTER net follow up of IceCube-160731A
  62. Swift follow up of IceCube-160731A
  63. GRB 160801A: MITSuME Okayama upper limits
  64. GRB 160801A: Swift detection of a burst
  65. HAWC follow up of IceCube 160731
  66. GRB 160705B: 15 GHz upper limits from AMI
  67. GRB 160703A: 15 GHz upper limits from AMI
  68. Trigger 706396: Swift detection of a short burst from PSR 1119-6127
  69. Konus-Wind observation of short GRB 160726A
  70. GRB 160720A: Lomonosov BDRG gamma ray detection and MASTER limit
  71. Konus-Wind observation of GRB 160720A
  72. GRB 160716A: Swift/UVOT Detection
  73. GRB 160714A: Swift/UVOT Upper Limits
  74. Swift Trigger 704444 is probably not an astrophysical event.
  75. GRB 160714A: Swift-XRT observations
  76. Swift-BAT trigger 704327 was due to noise
  77. Swift Trigger 704327: MASTER syncronous optical observations
  78. Swift Trigger 704327: a possible GRB
  79. GRB 160712A: Swift/UVOT Upper Limits
  80. Konus-Wind observation of GRB 160712A
  81. GRB 160712A: GROND observations
  82. GRB 160629A: 15 GHz detections and upper limits from AMI
  83. GRB 160624A: 15 GHz upper limits from AMI
  84. GRB 160712A: Initial Swift/UVOT observations
  85. GRB 160712A: Global MASTER-Net optical observation
  86. GRB 160709A: Swift-XRT observations
  87. Konus-Wind observation of GRB 160709A (short/hard)
  88. Konus-Wind observation of GRB 160702A (short/hard)
  89. GRB 160705B: Swift/UVOT Upper Limits
  90. GRB 160705B: RATIR Optical and NIR Observations and Confirmation of the Fading Afterglow
  91. GRB 160705B: Swift detection of a burst
  92. GRB 160705A/MAXI J0748-149: MAXI/GSC detection
  93. GRB 160703A: Bassano Bresciano Observatory upper limits
  94. Konus-Wind observation of GRB 160703A
  95. GRB 160629A: AbAO optical observations
  96. GRB 160703A: Swift detection of a burst
  97. GRB 160629A: Swift/UVOT Upper Limits
  98. GRB 160630A: Swift/UVOT Upper Limits
  99. GRB 160625A: GROND upper limits
  100. GRB 160601A: 15 GHz upper limits from AMI

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