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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.

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"

20586 results found.

  1. GRB 160816A: TSHAO optical observations
  2. GRB 160816A: ISON/UAFO optical observations
  3. GRB 160816A: Further RATIR Optical and NIR Observations
  4. Fermi GBM Observations of IceCube-160806A
  5. GRB 160816A: Swift/UVOT Detection
  6. GRB 160804A: 15 GHz detections and upper limit from AMI
  7. GRB 160801A: 15 GHz upper limits from AMI
  8. GRB 160714A: 15 GHz upper limits from AMI
  9. GRB 160816A: RATIR Optical and NIR Observations
  10. GRB 160816A: Swift-XRT afterglow detection
  11. GRB 160816A: MASTER inspection
  12. GRB 160816A: Swift ToO observations
  13. GRB 160815A: Swift/UVOT Detection
  14. IceCube 160806A: Lomonosov BDRG gamma ray prompt observations
  15. Swift Trigger 707545 is likely 4U 1850-03/GS1843-02
  16. GRB 160804A: RATIR Optical and NIR Observations
  17. GRB 160804A: TSHAO optical observations
  18. GRB 160804A: ISON/UAFO optical observations
  19. GRB 160804A: GROND observations
  20. GRB 160804A: VLT/X-shooter redshift
  21. GRB 160804A: SAO RAS optical observations
  22. GRB 160804A: TNG optical observations, afterglow fading and candidate host galaxy
  23. GRB160804A: MASTER-SAAO observation
  24. GRB 160804A: Swift/UVOT Detection
  25. IceCube-160731A: iPTF P48 Observations
  26. GBM Observations of IceCube 160731
  27. GRB 160801A: TSHAO optical observations
  28. GRB 160801A: Swift/UVOT Upper Limits
  29. GRB 160801A: SAO RAS optical observations
  30. Global MASTER net follow up of IceCube-160731A
  31. Swift follow up of IceCube-160731A
  32. GRB 160716A: TAROT La Silla observatory optical observations
  33. GRB 160705B: 15 GHz upper limits from AMI
  34. GRB 160703A: 15 GHz upper limits from AMI
  35. GRB 160716A: Swift/UVOT Detection
  36. GRB 160714A: Swift/UVOT Upper Limits
  37. Swift Trigger 704327: KAIT Optical Observations
  38. GRB 160714A: TAROT Calern observatory optical observations
  39. GRB 160714A: Swift-XRT observations
  40. GRB 160623A: afterglow spectroscopy by GTC and independent redshift determination
  41. GRB 160623A: optical astrometry, photometry, and redshift
  42. Swift-BAT trigger 704327 was due to noise
  43. Swift Trigger 704327: MASTER syncronous optical observations
  44. GRB 160714A: MASTER early optical observations
  45. GRB 160712A: Further GROND observations
  46. GRB 160714A: Optical observations from OSN
  47. GRB 160714A: Swift-XRT observations
  48. GRB 160712A: Swift/UVOT Upper Limits
  49. GRB 160712A: RATIR Optical and NIR Observations
  50. GRB 160712A: GROND observations
  51. GRB 160712A: Skynet R-COP observations
  52. GRB 160629A: 15 GHz detections and upper limits from AMI
  53. GRB 160624A: 15 GHz upper limits from AMI
  54. GRB 160712A: Initial Swift/UVOT observations
  55. GRB 160712A: Swift-XRT observations
  56. GRB 160625B: TSHAO optical observations
  57. GRB 160709A: Swift-XRT observations
  58. GRB 160709A: Global MASTER Net Fermi GBM Alerts observations
  59. GRB 160709A: Fermi GBM Observations
  60. GRB 160709A: Tiled Swift observations
  61. GRB 160705B: TAROT Calern observatory optical observations
  62. GRB 160629A: Mondy optical observations
  63. GRB 160629A: AbAO optical observations
  64. GRB 160703A: Keck-I/LRIS Optical Observations
  65. GRB 160705B: Swift/UVOT Upper Limits
  66. GRB 160705B: RATIR Optical and NIR Observations and Confirmation of the Fading Afterglow
  67. GRB 160703A: Swift/UVOT Detection
  68. GRB 160703A: Swift-XRT afterglow detection
  69. GRB 160703A: MITSuME Akeno Optical Observations
  70. GRB 160625B: RTT150 optical observations
  71. GRB 160703A: Bassano Bresciano Observatory upper limits
  72. GRB 160703A: Zadko observatory - Gingin optical observations
  73. GRB 160629A: AbAO optical observations
  74. GRB 160629A: Swift/UVOT Upper Limits
  75. GRB 160629A: Swift-XRT afterglow detection
  76. GRB 160625B: LCOGT FTN observations
  77. GRB 160629A: Global MASTER Net Prompt OT observations
  78. GRB 160629A: Swift ToO observations
  79. GRB 160630A: Skynet PROMPT-CTIO observations of the optical afterglow
  80. GRB 160630A: Zadko observatory - Gingin optical observations
  81. GRB 160630A: TAROT La Silla observatory optical observations
  82. GRB 160629A: BTA and GTC redshift
  83. GRB 160630A: Swift/UVOT Upper Limits
  84. GRB 160625A: GROND upper limits
  85. GRB 160630A: REM NIR observations
  86. GRB 160630A: GROND Afterglow Detection
  87. GRB 160629A: SAO RAS independent OT detection
  88. GRB 160629A: TAROT Calern observatory optical detection
  89. GRB 160625B: TSHAO optical observations, correction GCN 19619
  90. GRB 160625B: TSHAO optical observations
  91. GRB 160625B: SMARTS optical/IR afterglow observations
  92. Pi of the Sky detection of an optical flash accompanying GRB 160625B
  93. GRB 160623A: SAO RAS optical observations
  94. GRB 160625B: SAO RAS optical observations
  95. GRB 160625B: 15 GHz detection from AMI
  96. GRB 160623A: Possible detection of a radio afterglow at 15 GHz with AMI
  97. GRB 160601A: 15 GHz upper limits from AMI
  98. SGR 1935+2154: AMI 15 GHz upper limits of the magnetar during outburst
  99. GRB 160625B: VLA Detection
  100. GRB 160625B: TSHAO optical observations

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