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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"

41728 results found.

  1. GRB 150210A: Tiled Swift observations
  2. Konus-Wind observation of GRB 150210A
  3. IPN Triangulation of GRB 150210A
  4. GRB 150210A: Fermi-LAT detection
  5. GRB 150211A: RATIR Optical and NIR Observations
  6. GRB 150211A: No afterglow detection in the Swift/UVOT initial observation
  7. GRB 150211A: Swift-XRT observations
  8. GRB 150211A: Swift detection of a burst
  9. GRB 150211A: MASTER early optical observations
  10. GRB 150210A: Fermi GBM detection
  11. GRB 150101B/ Swift J123205.1-105602: Second epoch Chandra observations
  12. GRB 150204A: GROND observations
  13. GRB 150202B: Swift/XRT afterglow confirmation
  14. GRB 150204A: Swift/XRT afterglow confirmation
  15. Konus-Wind observation of GRB 150206A
  16. GRB 150206A: Swift-BAT refined analysis
  17. GRB 150203A iTelescope observation
  18. GRB 150206A: Swift/UVOT Detection
  19. GRB 150206A: Swift-XRT refined Analysis
  20. Konus-Wind observation of GRB 150202B
  21. GRB 140206B: Continued iPTF Observations
  22. GRB 150206A: VLT/X-shooter redshift
  23. GRB 150206A: GROND afterglow observations
  24. GRB 150206B: Fermi GBM detection
  25. Trigger 630047: Swift detection of 1RXS J180408.9-342058
  26. GRB 150206B: iPTF Optical Observations
  27. GRB 150206A: MAXI/GSC detection
  28. GRB 150206A: Swift detection of a burst with an optical afterglow
  29. GRB 150204A: LCOGT-Sutherland and Siding Springs observations
  30. GRB 150204A: Swift/UVOT Upper Limits
  31. GRB 150203A: Swift-BAT refined analysis
  32. GRB 150204A: Swift-XRT observations
  33. GRB 150204A: Fermi GBM detection
  34. GRB 150204A: Swift ToO observations
  35. GRB 150204A BAT refined analysis
  36. GRB 150202B: Swift XRT/UVOT observations
  37. GRB 150204A found in ground analysis of Swift-BAT data
  38. Swift Trigger 629693 was a noise event
  39. GRB 150203A: RAPTOR Limits Beginning at the Gamma-Ray Emitting Interval
  40. GRB 150202A, Swift-BAT refined analysis
  41. GRB 150203A: Swift/UVOT Upper Limits
  42. GRB 150203A: ISON-NM early optical limit
  43. IPN Triangulation of GRB 150202B
  44. GRB 150203A: Swift-XRT refined Analysis
  45. GRB 150202B: Tiled Swift observations
  46. GRB 150203A: MITSuME Okayama upper limits
  47. Swift Trigger 629693: probably not real
  48. Fermi GBM trigger 150202624 is not a GRB
  49. GRB 150202A: Swift/UVOT Upper Limits
  50. GRB 150203A: REM optical and NIR observations
  51. GRB 150202A: Swift-XRT refined Analysis
  52. GRB 150203A: Fermi GBM observation
  53. GRB 150202B: Fermi GBM detection
  54. GRB 150203A: TAROT La Silla observatory optical observations
  55. GRB 150203A: GROND Upper limits
  56. GRB 150202B: Fermi-LAT detection
  57. GRB 150203A: RATIR Optical and NIR Observations
  58. GRB 150202A: GROND Upper limits
  59. GRB 150203A: P60 observations
  60. GRB 150203A: KAIT Optical Upper Limit
  61. GRB 150203A: Swift detection of a burst
  62. GRB 150202A: Swift detection of a burst
  63. GRB 150201A: Swift/UVOT Upper Limits
  64. GRB 150201A, Swift-BAT refined analysis
  65. Konus-Wind observation of GRB 150201A
  66. GRB 150201A: GROND upper limits
  67. GRB 150201A: Swift-XRT refined Analysis
  68. GRB 150201A: Fermi GBM observation
  69. GRB 150201A: Swift detection of a burst
  70. Swift Trigger 629206 is likely 1RXS J180408.9-342058
  71. GRB 150120B: Khureltogot optical observations
  72. GRB 150128A: MASTER OT detction during inspection
  73. GRB 150127B: Fermi GBM detection
  74. Konus-Wind observation of GRB 150127B
  75. GRB 150123A: MASTER inspection
  76. GRB 150120A: 9.8 GHz VLA upper limit
  77. IPN Triangulation of GRB 150127B
  78. IPN Triangulation of GRB 150127A
  79. GRB 150120A: Gemini-N imaging and host redshift
  80. Konus-Wind observation of GRB 150126A reveals its ultra-long nature
  81. GRB 150127A: Fermi-LAT detection
  82. GRB150127A: Fermi GBM Detection
  83. Swift Trigger 628458 likely not astrophysical
  84. GRB 150126A: Fermi GBM Detection
  85. GRB 150126A: MAXI/GSC afterglow candidate detection
  86. Konus-Wind observation of GRB 150123A
  87. GRB 150120A: possible AMI 15 GHz detection
  88. GRB 150123A: Swift/UVOT observations
  89. GRB 150123A: Swift-XRT observations
  90. GRB 150120B: Mondy optical observations
  91. GRB 150123A Tiled Swift observations
  92. GRB 150123A: MAXI/GSC detection
  93. Konus-Wind observation of GRB 150118B
  94. GRB 150120B: RATIR Optical and NIR Observations
  95. IPN Triangulation of GRB 150118B (long/intense)
  96. GRB 150120A: ISON-NM early optical limit
  97. GRB 150120B: FTN early optical light curve
  98. GRB150120B: Xinglong TNT optical observation
  99. GRB 150120B: Swift/UVOT Upper Limits
  100. GRB 150120B, Optical observations

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