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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"
  1. GRB 160804A: Swift-XRT refined Analysis
  2. GRB 160804A: Enhanced Swift-XRT position
  3. GRB 160804A: Swift detection of a burst
  4. IceCube-160731A: iPTF P48 Observations
  5. GRB 160802A: Lomonosov BDRG gamma ray detection
  6. GBM Observations of IceCube 160731
  7. GRB 160801A: TSHAO optical observations
  8. GRB 160801A: Swift/UVOT Upper Limits
  9. GRB 160801A: SAO RAS optical observations
  10. GRB 160802A: Fermi GBM detection
  11. GRB 160801A: NOT upper limits
  12. FACT follow-up of IceCube20160731
  13. GRB 160726A: CALET Gamma-Ray Burst Monitor detection
  14. GRB 160801A: Swift-XRT refined Analysis
  15. GRB 160801A: Swift-BAT refined analysis
  16. Global MASTER net follow up of IceCube-160731A
  17. Swift follow up of IceCube-160731A
  18. GRB 160801A: Enhanced Swift-XRT position
  19. GRB 160801A: MITSuME Okayama upper limits
  20. GRB 160801A: Swift detection of a burst
  21. HAWC follow up of IceCube 160731
  22. GRB 160716A: TAROT La Silla observatory optical observations
  23. GRB160720A: Astrosat CZTI detection
  24. GRB160709A: Astrosat CZTI detection of short GRB
  25. GRB160703A: Astrosat CZTI detection
  26. GRB 160705B: 15 GHz upper limits from AMI
  27. GRB 160703A: 15 GHz upper limits from AMI
  28. GBM observation of SGR-like burst from the direction of PSR 1119-6127
  29. Trigger 706396: Swift detection of a short burst from PSR 1119-6127
  30. GRB 160726A, Swift-BAT refined analysis
  31. Konus-Wind observation of short GRB 160726A
  32. GRB 160726A: Fermi GBM observation
  33. GRB 160726A: Swift detection of a short burst
  34. GRB 160721A: CALET Gamma-Ray Burst Monitor detection
  35. GRB 160720A CALET Gamma-Ray Burst Monitor detection
  36. GRB 160720A: Lomonosov BDRG gamma ray detection and MASTER limit
  37. Konus-Wind observation of GRB 160720A
  38. IPN Triangulation of GRB 160720A
  39. GRB 160703, GRB 160705, GRB 160720, SGR1935+2154: First SGRs and GRBs detected by Lomonosov.
  40. GRB 160720A: Fermi GBM detection
  41. Fermi GBM trigger 490701713/160720418 is not a GRB
  42. Fermi GBM trigger 490365157/160716523 is not a GRB
  43. GRB 160716A: Swift/UVOT Detection
  44. GRB 160714A: Swift/UVOT Upper Limits
  45. GRB 160716A: Swift-BAT refined analysis
  46. GRB 160716A: Swift-XRT refined Analysis
  47. GRB 160716A: Enhanced Swift-XRT position
  48. GRB 160716A: Swift detection of a burst
  49. Swift Trigger 704327: KAIT Optical Observations
  50. Swift Trigger 704444 is probably not an astrophysical event.
  51. GRB 160712A: Swift-BAT refined analysis
  52. GRB 160714A: TAROT Calern observatory optical observations
  53. GRB 160714A: Swift-XRT observations
  54. GRB 160623A: afterglow spectroscopy by GTC and independent redshift determination
  55. GRB 160714A: Fermi GBM observation
  56. GRB 160623A: optical astrometry, photometry, and redshift
  57. Swift-BAT trigger 704327 was due to noise
  58. Fermi GBM trigger 490193747/160714539 is not a GRB
  59. GRB 160714A: Swift-BAT refined analysis,
  60. Swift Trigger 704327: MASTER syncronous optical observations
  61. GRB 160714A: MASTER early optical observations
  62. GRB 160712A: Further GROND observations
  63. GRB 160709A CALET Gamma-Ray Burst Monitor detection
  64. Swift Trigger 704327: a possible GRB
  65. GRB 160714A: Optical observations from OSN
  66. GRB 160714A: Swift-XRT observations
  67. GRB 160714A: Swift detection of a short burst
  68. GRB 160712A: Swift/UVOT Upper Limits
  69. GRB 160712A: RATIR Optical and NIR Observations
  70. Konus-Wind observation of GRB 160712A
  71. GRB 160712A: GROND observations
  72. GRB 160712A: Swift-XRT refined Analysis
  73. GRB 160712A: Skynet R-COP observations
  74. GRB 160712A: Enhanced Swift-XRT position
  75. GRB 160629A: 15 GHz detections and upper limits from AMI
  76. GRB 160624A: 15 GHz upper limits from AMI
  77. GRB 160712A: Initial Swift/UVOT observations
  78. GRB 160712A: Swift-XRT observations
  79. GRB 160712A: Global MASTER-Net optical observation
  80. GRB 160712A: Swift detection of a burst
  81. GRB 160625B: Global MASTER-Crimea prompt optical emission detection (fwd)
  82. GRB 160709A: MASTER early imaging Swift BAT error box
  83. GRB 160709A, Swift-BAT detection and localization
  84. GRB 160625B: TSHAO optical observations
  85. GRB 160709A: Swift-XRT observations
  86. GRB 160709A: Global MASTER Net Fermi GBM Alerts observations
  87. Konus-Wind observation of GRB 160709A (short/hard)
  88. GRB 160709A: Fermi GBM Observations
  89. GRB 160709A: Fermi-LAT detection
  90. GRB 160709A: Tiled Swift observations
  91. Fermi GBM trigger 489771293/160709649 is not a GRB
  92. GRB 160705B: TAROT Calern observatory optical observations
  93. GRB 160628A CALET Gamma-Ray Burst Monitor detection
  94. GRB 160629A: Mondy optical observations
  95. GRB 160629A: AbAO optical observations
  96. GRB 160703A: Keck-I/LRIS Optical Observations
  97. Konus-Wind observation of GRB 160702A (short/hard)
  98. IPN Triangulation of GRB 160702A (short/hard)
  99. SGR 1935+2154: CALET Gamma-Ray Burst Monitor detections
  100. GRB 160705B: Swift/UVOT Upper Limits

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