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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"

27092 results found.

  1. Swift detection of an outburst from SGR 1935+2154
  2. Trigger 631946: Swift detection of H1745-203
  3. Fermi GBM trigger 150220229 is not a GRB
  4. GRB 150219A: Fermi GBM observation
  5. Trigger 631747: Swift detection of 4U 0614+09
  6. GRB 150213B: P60 Observations
  7. GRB 150213B: Swift/UVOT Detection
  8. GRB 150213B: Swift-BAT refined analysis
  9. GRB 150213B: RATIR Optical and NIR Observations
  10. GRB 150213B: Swift-XRT refined Analysis
  11. GRB 150213B: AAO optical observations
  12. GRB 150212A: Swift/UVOT Observations
  13. GRB 150213B: Tautenburg Afterglow Detection
  14. GRB 150213B: Swift detection of a burst with an optical afterglow
  15. GRB 150213A: Fermi GBM detection
  16. GRB 150212A: Swift-XRT refined Analysis
  17. GRB 150211A: ROTSE-III Upper Optical Limit
  18. GRB 150212A: RATIR Optical and NIR Observations
  19. GRB 150212A: Skynet DSO14/GORT observations
  20. GRB 150212A: Swift-BAT refined analysis
  21. GRB 150212A: MASTER optical observations
  22. GRB 150212A: No Swift/UVOT detection in initial observation
  23. GRB 150212A: Swift-XRT afterglow detection
  24. GRB150212A: P60 Afterglow Candidate
  25. Konus-Wind observation of GRB 150211A
  26. GRB 150212A: Swift detection of a burst
  27. GRB 150211A iTelescope observation
  28. GRB 150211A: Swift/UVOT Upper Limits
  29. GRB 150210A: MASTER SN detection during LAT error box inspection
  30. GRB 150211A: Swift-BAT refined analysis
  31. GRB 150211A: Swift-XRT refined Analysis
  32. GRB 150210A: Fermi-LAT detection
  33. GRB 150211A: RATIR Optical and NIR Observations
  34. GRB 150211A: No afterglow detection in the Swift/UVOT initial observation
  35. GRB 150211A: Swift-XRT observations
  36. GRB 150211A: Swift detection of a burst
  37. GRB 150211A: MASTER early optical observations
  38. GRB 150210A: Fermi GBM detection
  39. GRB 150204A: GROND observations
  40. Konus-Wind observation of GRB 150206A
  41. GRB 150206A: Swift-BAT refined analysis
  42. GRB 150203A iTelescope observation
  43. GRB 150206A: Swift/UVOT Detection
  44. GRB 150206A: Swift-XRT refined Analysis
  45. GRB 150206A: GROND afterglow observations
  46. GRB 150206B: Fermi GBM detection
  47. Trigger 630047: Swift detection of 1RXS J180408.9-342058
  48. GRB 150206B: iPTF Optical Observations
  49. GRB 150206A: MAXI/GSC detection
  50. GRB 150206A: Swift detection of a burst with an optical afterglow
  51. GRB 150204A: LCOGT-Sutherland and Siding Springs observations
  52. GRB 150204A: Swift/UVOT Upper Limits
  53. GRB 150203A: Swift-BAT refined analysis
  54. GRB 150204A: Fermi GBM detection
  55. GRB 150204A found in ground analysis of Swift-BAT data
  56. Swift Trigger 629693 was a noise event
  57. GRB 150203A: RAPTOR Limits Beginning at the Gamma-Ray Emitting Interval
  58. GRB 150202A, Swift-BAT refined analysis
  59. GRB 150203A: Swift/UVOT Upper Limits
  60. GRB 150203A: ISON-NM early optical limit
  61. GRB 150203A: Swift-XRT refined Analysis
  62. Swift Trigger 629693: probably not real
  63. Fermi GBM trigger 150202624 is not a GRB
  64. GRB 150202A: Swift/UVOT Upper Limits
  65. GRB 150202A: Swift-XRT refined Analysis
  66. GRB 150203A: Fermi GBM observation
  67. GRB 150202B: Fermi GBM detection
  68. GRB 150203A: TAROT La Silla observatory optical observations
  69. GRB 150203A: GROND Upper limits
  70. GRB 150202B: Fermi-LAT detection
  71. GRB 150203A: RATIR Optical and NIR Observations
  72. GRB 150202A: GROND Upper limits
  73. GRB 150203A: P60 observations
  74. GRB 150203A: Swift detection of a burst
  75. GRB 150202A: Swift detection of a burst
  76. GRB 150201A: Swift/UVOT Upper Limits
  77. GRB 150201A, Swift-BAT refined analysis
  78. Konus-Wind observation of GRB 150201A
  79. GRB 150201A: GROND upper limits
  80. GRB 150201A: Swift-XRT refined Analysis
  81. GRB 150201A: Fermi GBM observation
  82. GRB 150201A: Swift detection of a burst
  83. Swift Trigger 629206 is likely 1RXS J180408.9-342058
  84. GRB 150128A: MASTER OT detction during inspection
  85. GRB 150127B: Fermi GBM detection
  86. GRB 150123A: MASTER inspection
  87. IPN Triangulation of GRB 150127B
  88. GRB 150127A: Fermi-LAT detection
  89. GRB150127A: Fermi GBM Detection
  90. Swift Trigger 628458 likely not astrophysical
  91. GRB 150126A: Fermi GBM Detection
  92. GRB 150126A: MAXI/GSC afterglow candidate detection
  93. GRB 150123A: Swift/UVOT observations
  94. GRB 150123A: Swift-XRT observations
  95. GRB 150120B: RATIR Optical and NIR Observations
  96. IPN Triangulation of GRB 150118B (long/intense)
  97. GRB 150120A: ISON-NM early optical limit
  98. GRB 150120B: FTN early optical light curve
  99. GRB 150120B: Swift/UVOT Upper Limits
  100. GRB 150120B: GROND Afterglow Detection

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