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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"

19090 results found.

  1. GRB 160804A: Swift detection of a burst
  2. IceCube-160731A: iPTF P48 Observations
  3. GRB 160801A: TSHAO optical observations
  4. GRB 160801A: Swift/UVOT Upper Limits
  5. GRB 160801A: SAO RAS optical observations
  6. GRB 160801A: NOT upper limits
  7. Swift follow up of IceCube-160731A
  8. GRB 160801A: Enhanced Swift-XRT position
  9. GRB 160801A: MITSuME Okayama upper limits
  10. GRB 160801A: Swift detection of a burst
  11. HAWC follow up of IceCube 160731
  12. GRB 160716A: TAROT La Silla observatory optical observations
  13. GBM observation of SGR-like burst from the direction of PSR 1119-6127
  14. Trigger 706396: Swift detection of a short burst from PSR 1119-6127
  15. Konus-Wind observation of GRB 160720A
  16. GRB 160703, GRB 160705, GRB 160720, SGR1935+2154: First SGRs and GRBs detected by Lomonosov.
  17. GRB 160716A: Swift/UVOT Detection
  18. GRB 160714A: Swift/UVOT Upper Limits
  19. GRB 160716A: Enhanced Swift-XRT position
  20. GRB 160716A: Swift detection of a burst
  21. Swift Trigger 704444 is probably not an astrophysical event.
  22. GRB 160714A: TAROT Calern observatory optical observations
  23. GRB 160623A: optical astrometry, photometry, and redshift
  24. Swift-BAT trigger 704327 was due to noise
  25. GRB 160714A: Swift-BAT refined analysis,
  26. Swift Trigger 704327: MASTER syncronous optical observations
  27. GRB 160712A: Further GROND observations
  28. Swift Trigger 704327: a possible GRB
  29. GRB 160714A: Optical observations from OSN
  30. GRB 160714A: Swift-XRT observations
  31. GRB 160712A: Swift/UVOT Upper Limits
  32. GRB 160712A: RATIR Optical and NIR Observations
  33. GRB 160712A: GROND observations
  34. GRB 160712A: Skynet R-COP observations
  35. GRB 160712A: Enhanced Swift-XRT position
  36. GRB 160712A: Initial Swift/UVOT observations
  37. GRB 160712A: Swift-XRT observations
  38. GRB 160625B: Global MASTER-Crimea prompt optical emission detection (fwd)
  39. GRB 160709A, Swift-BAT detection and localization
  40. GRB 160625B: TSHAO optical observations
  41. GRB 160709A: Swift-XRT observations
  42. GRB 160709A: Global MASTER Net Fermi GBM Alerts observations
  43. Konus-Wind observation of GRB 160709A (short/hard)
  44. GRB 160709A: Tiled Swift observations
  45. GRB 160705B: TAROT Calern observatory optical observations
  46. GRB 160629A: Mondy optical observations
  47. GRB 160629A: AbAO optical observations
  48. GRB 160703A: Keck-I/LRIS Optical Observations
  49. IPN Triangulation of GRB 160702A (short/hard)
  50. GRB 160705B: Swift/UVOT Upper Limits
  51. GRB 160705B: RATIR Optical and NIR Observations and Confirmation of the Fading Afterglow
  52. GRB 160705B: Enhanced Swift-XRT position
  53. GRB 160705B: Swift detection of a burst
  54. GRB 160703A: Swift/UVOT Detection
  55. GRB 160703A: MITSuME Ishigakijima Optical Observation
  56. GRB 160625B: RTT150 optical observations
  57. GRB 160703A: Bassano Bresciano Observatory upper limits
  58. GRB 160703A: Zadko observatory - Gingin optical observations
  59. GRB 160629A: AbAO optical observations
  60. GRB 160703A: Swift detection of a burst
  61. GRB 160629A: Swift/UVOT Upper Limits
  62. GRB 160625B: SAO RAS monitoring
  63. GRB 160629A: Swift-XRT afterglow detection
  64. GRB 160629A: Swift ToO observations
  65. GRB 160630A: Skynet PROMPT-CTIO observations of the optical afterglow
  66. GRB 160630A: Zadko observatory - Gingin optical observations
  67. GRB 160630A: TAROT La Silla observatory optical observations
  68. GRB 160630A: Swift/UVOT Upper Limits
  69. GRB 160625A: GROND upper limits
  70. GRB 160629A: Fermi GBM observation
  71. GRB 160630A: REM NIR observations
  72. GRB 160630A: Enhanced Swift-XRT position
  73. GRB 160630A: GROND Afterglow Detection
  74. GRB 160630A: Swift detection of a burst
  75. GRB 160629A: TAROT Calern observatory optical detection
  76. GRB 160625B: TSHAO optical observations, correction GCN 19619
  77. GRB 160625B: TSHAO optical observations
  78. GRB 160623A: SAO RAS optical observations
  79. GRB 160625B: Global MASTER-Net prompt optical emission detection
  80. GRB 160625B: SAO RAS optical observations
  81. GRB 160625B: TSHAO optical observations
  82. GRB 160625B: Mini-MegaTORTORA detection of bright optical flash simultaneous with LAT event
  83. GRB 160625B: RATIR Optical and NIR Observations
  84. GRB 160625B: MITSuME Ishigakijima Optical Observation
  85. Swift Trigger 701668 is probably not an astrophysical event
  86. IPN Triangulation of GRB 160620A (short/hard)
  87. GRB 160625A: Swift/UVOT Upper Limits
  88. Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
  89. GRB 160625B: Swift/UVOT Detection
  90. GRB 160625B: RATIR Optical and NIR Afterglow Detection
  91. GRB 160625B: Swift-XRT afterglow detection
  92. GRB 160625A: Enhanced Swift-XRT position
  93. GRB 160625B: Tiled Swift observations
  94. GRB 160625B: Fermi-LAT detection of a bright burst
  95. GRB 160625A: Swift-XRT observations
  96. GRB 160624A: Swift/UVOT Upper Limits
  97. GRB 160624A: Lulin observation
  98. GRB 160623A: MITSuME Ishigakijima Optical Observation
  99. GRB 160624A: MITSuME Ishigakijima upper limits
  100. GRB 160624A, Swift-BAT refined analysis

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