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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"

19697 results found.

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

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