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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"

27593 results found.

  1. GRB 150211A: Swift/UVOT Upper Limits
  2. GRB 150210A: MASTER SN detection during LAT error box inspection
  3. GRB 150211A: Swift-BAT refined analysis
  4. GRB 150211A: Swift-XRT refined Analysis
  5. GRB 150210A: Fermi-LAT detection
  6. GRB 150211A: RATIR Optical and NIR Observations
  7. GRB 150211A: No afterglow detection in the Swift/UVOT initial observation
  8. GRB 150211A: Swift-XRT observations
  9. GRB 150211A: Swift detection of a burst
  10. GRB 150211A: MASTER early optical observations
  11. GRB 150210A: Fermi GBM detection
  12. GRB 150204A: GROND observations
  13. Konus-Wind observation of GRB 150206A
  14. GRB 150206A: Swift-BAT refined analysis
  15. GRB 150203A iTelescope observation
  16. GRB 150206A: Swift/UVOT Detection
  17. GRB 150206A: Swift-XRT refined Analysis
  18. GRB 150206A: GROND afterglow observations
  19. GRB 150206B: Fermi GBM detection
  20. Trigger 630047: Swift detection of 1RXS J180408.9-342058
  21. GRB 150206B: iPTF Optical Observations
  22. GRB 150206A: MAXI/GSC detection
  23. GRB 150206A: Swift detection of a burst with an optical afterglow
  24. GRB 150204A: LCOGT-Sutherland and Siding Springs observations
  25. GRB 150204A: Swift/UVOT Upper Limits
  26. GRB 150203A: Swift-BAT refined analysis
  27. GRB 150204A: Swift-XRT observations
  28. GRB 150204A: Fermi GBM detection
  29. GRB 150204A: Swift ToO observations
  30. GRB 150204A BAT refined analysis
  31. GRB 150204A found in ground analysis of Swift-BAT data
  32. Swift Trigger 629693 was a noise event
  33. GRB 150203A: RAPTOR Limits Beginning at the Gamma-Ray Emitting Interval
  34. GRB 150202A, Swift-BAT refined analysis
  35. GRB 150203A: Swift/UVOT Upper Limits
  36. GRB 150203A: ISON-NM early optical limit
  37. IPN Triangulation of GRB 150202B
  38. GRB 150203A: Swift-XRT refined Analysis
  39. Swift Trigger 629693: probably not real
  40. Fermi GBM trigger 150202624 is not a GRB
  41. GRB 150202A: Swift/UVOT Upper Limits
  42. GRB 150202A: Swift-XRT refined Analysis
  43. GRB 150203A: Fermi GBM observation
  44. GRB 150202B: Fermi GBM detection
  45. GRB 150203A: TAROT La Silla observatory optical observations
  46. GRB 150203A: GROND Upper limits
  47. GRB 150202B: Fermi-LAT detection
  48. GRB 150203A: RATIR Optical and NIR Observations
  49. GRB 150202A: GROND Upper limits
  50. GRB 150203A: P60 observations
  51. GRB 150203A: Swift detection of a burst
  52. GRB 150202A: Swift detection of a burst
  53. GRB 150201A: Swift/UVOT Upper Limits
  54. GRB 150201A, Swift-BAT refined analysis
  55. Konus-Wind observation of GRB 150201A
  56. GRB 150201A: GROND upper limits
  57. GRB 150201A: Swift-XRT refined Analysis
  58. GRB 150201A: Fermi GBM observation
  59. GRB 150201A: Swift detection of a burst
  60. Swift Trigger 629206 is likely 1RXS J180408.9-342058
  61. GRB 150128A: MASTER OT detction during inspection
  62. GRB 150127B: Fermi GBM detection
  63. GRB 150123A: MASTER inspection
  64. IPN Triangulation of GRB 150127B
  65. GRB 150127A: Fermi-LAT detection
  66. GRB150127A: Fermi GBM Detection
  67. Swift Trigger 628458 likely not astrophysical
  68. GRB 150126A: Fermi GBM Detection
  69. GRB 150126A: MAXI/GSC afterglow candidate detection
  70. GRB 150123A: Swift/UVOT observations
  71. GRB 150123A: Swift-XRT observations
  72. GRB 150120B: RATIR Optical and NIR Observations
  73. IPN Triangulation of GRB 150118B (long/intense)
  74. GRB 150120A: ISON-NM early optical limit
  75. GRB 150120B: FTN early optical light curve
  76. GRB 150120B: Swift/UVOT Upper Limits
  77. GRB 150120B: GROND Afterglow Detection
  78. GRB 150120A: Swift-XRT refined Analysis
  79. GRB 150101B: Confirmation of a fading optical counterpart
  80. GRB 150120B: Swift-BAT refined analysis
  81. GRB 150120A: Swift-BAT refined analysis
  82. GRB 150118C: Fermi GBM Detection
  83. GRB 150101B/Swift J123205.1-105602: TNG NIR follow-up
  84. GRB 150120B: Swift-XRT refined Analysis
  85. IPN triangulation of GRB 150118C (short/hard)
  86. GRB 150120A: Swift/UVOT Upper Limits
  87. GRB 150101B/Swift J123205.1-105602, deep VLT observations
  88. GRB 150120A: Fermi GBM observation
  89. GRB 150120B: FTN optical afterglow confirmation
  90. GRB 150120B: Swift detection of a burst
  91. GRB 150120A: Gemini-North optical imaging
  92. GRB 150120A: P60 optical observations
  93. GRB 150120A: Swift detection of a possibly-short burst
  94. GRB 150101B/Swift J123205.1-105602: continued WSRT radio and VLT optical observations
  95. GRB 150118B: Fermi GBM Detection
  96. GRB 150118B: Fermi-LAT detection
  97. Trigger 626581: Swift detection of GRO J1008-57
  98. The Swift Detection of a Large Flare from the RS CVn Binary SZ Psc
  99. Swift detection of the variable star SZ Psc
  100. GRB 150110C: Swift/UVOT Upper Limits

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