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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"

27113 results found.

  1. Trigger 633105 is likely not a GRB
  2. GRB 150301A: Fermi GBM observation
  3. GRB 150301A: Swift detection of a short burst or new SGR
  4. Swift-BAT refined analysis of magnetar 4U 0142+61 (Trigger 632888)
  5. Fermi GBM Observations of Magnetar 4U 0142+61
  6. Trigger 632888: Swift detection of the magnetar 4U 0142+61
  7. GRB 150222A: Further GROND Observations
  8. GRB 150220A: Fermi GBM observation
  9. IPN Triangulation of GRB 150220A
  10. GRB 150222A: I-band observations from OSN
  11. GRB 150222A: Swift/UVOT Upper Limits
  12. GRB 150222A: Swift-XRT refined Analysis
  13. Fermi GBM Observations of SGR 1935+2154
  14. GRB 150222A: GROND optical afterglow candidate
  15. Fermi GBM trigger 150223068 is not a GRB
  16. GRB 150222A: Swift-BAT refined analysis
  17. SGR 1935+2154: Swift-BAT refined analysis
  18. GRB 150222A: Mondy optical observations
  19. GRB 150222A: Zadko observatory - Gingin optical observations
  20. GRB 150222A: MASTER early optical observations
  21. GRB 150222A: Swift detection of a burst
  22. Swift detection of an outburst from SGR 1935+2154
  23. Trigger 631946: Swift detection of H1745-203
  24. Fermi GBM trigger 150220229 is not a GRB
  25. GRB 150219A: Fermi GBM observation
  26. Trigger 631747: Swift detection of 4U 0614+09
  27. GRB 150213B: P60 Observations
  28. GRB 150213B: Swift/UVOT Detection
  29. GRB 150213B: Swift-BAT refined analysis
  30. GRB 150213B: RATIR Optical and NIR Observations
  31. GRB 150213B: Swift-XRT refined Analysis
  32. GRB 150213B: AAO optical observations
  33. GRB 150212A: Swift/UVOT Observations
  34. GRB 150213B: Tautenburg Afterglow Detection
  35. GRB 150213B: Swift detection of a burst with an optical afterglow
  36. GRB 150213A: Fermi GBM detection
  37. GRB 150212A: Swift-XRT refined Analysis
  38. GRB 150211A: ROTSE-III Upper Optical Limit
  39. GRB 150212A: RATIR Optical and NIR Observations
  40. GRB 150212A: Skynet DSO14/GORT observations
  41. GRB 150212A: Swift-BAT refined analysis
  42. GRB 150212A: MASTER optical observations
  43. GRB 150212A: No Swift/UVOT detection in initial observation
  44. GRB 150212A: Swift-XRT afterglow detection
  45. GRB150212A: P60 Afterglow Candidate
  46. Konus-Wind observation of GRB 150211A
  47. GRB 150212A: Swift detection of a burst
  48. GRB 150211A iTelescope observation
  49. GRB 150211A: Swift/UVOT Upper Limits
  50. GRB 150210A: MASTER SN detection during LAT error box inspection
  51. GRB 150211A: Swift-BAT refined analysis
  52. GRB 150211A: Swift-XRT refined Analysis
  53. GRB 150210A: Fermi-LAT detection
  54. GRB 150211A: RATIR Optical and NIR Observations
  55. GRB 150211A: No afterglow detection in the Swift/UVOT initial observation
  56. GRB 150211A: Swift-XRT observations
  57. GRB 150211A: Swift detection of a burst
  58. GRB 150211A: MASTER early optical observations
  59. GRB 150210A: Fermi GBM detection
  60. GRB 150204A: GROND observations
  61. Konus-Wind observation of GRB 150206A
  62. GRB 150206A: Swift-BAT refined analysis
  63. GRB 150203A iTelescope observation
  64. GRB 150206A: Swift/UVOT Detection
  65. GRB 150206A: Swift-XRT refined Analysis
  66. GRB 150206A: GROND afterglow observations
  67. GRB 150206B: Fermi GBM detection
  68. Trigger 630047: Swift detection of 1RXS J180408.9-342058
  69. GRB 150206B: iPTF Optical Observations
  70. GRB 150206A: MAXI/GSC detection
  71. GRB 150206A: Swift detection of a burst with an optical afterglow
  72. GRB 150204A: LCOGT-Sutherland and Siding Springs observations
  73. GRB 150204A: Swift/UVOT Upper Limits
  74. GRB 150203A: Swift-BAT refined analysis
  75. GRB 150204A: Fermi GBM detection
  76. GRB 150204A found in ground analysis of Swift-BAT data
  77. Swift Trigger 629693 was a noise event
  78. GRB 150203A: RAPTOR Limits Beginning at the Gamma-Ray Emitting Interval
  79. GRB 150202A, Swift-BAT refined analysis
  80. GRB 150203A: Swift/UVOT Upper Limits
  81. GRB 150203A: ISON-NM early optical limit
  82. GRB 150203A: Swift-XRT refined Analysis
  83. Swift Trigger 629693: probably not real
  84. Fermi GBM trigger 150202624 is not a GRB
  85. GRB 150202A: Swift/UVOT Upper Limits
  86. GRB 150202A: Swift-XRT refined Analysis
  87. GRB 150203A: Fermi GBM observation
  88. GRB 150202B: Fermi GBM detection
  89. GRB 150203A: TAROT La Silla observatory optical observations
  90. GRB 150203A: GROND Upper limits
  91. GRB 150202B: Fermi-LAT detection
  92. GRB 150203A: RATIR Optical and NIR Observations
  93. GRB 150202A: GROND Upper limits
  94. GRB 150203A: P60 observations
  95. GRB 150203A: Swift detection of a burst
  96. GRB 150202A: Swift detection of a burst
  97. GRB 150201A: Swift/UVOT Upper Limits
  98. GRB 150201A, Swift-BAT refined analysis
  99. Konus-Wind observation of GRB 150201A
  100. GRB 150201A: GROND upper limits

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