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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"

675 results found.

  1. SGR 1935+2154: Swift/BAT-GUANO detection and arcminute localization
  2. GECAM observations of a series of bursts from SGR J1935+2154 (2021-09-15T14 to 2021-09-23T14)
  3. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 September 22
  4. GECAM observations of bursts from SGR J1935+2154 (2021-09-13T01 to 2021-09-15T14)
  5. Konus-Wind observation of the recent SGR 1935+2154 activity
  6. GECAM observations of bursts from SGR J1935+2154 (2021-09-12T05 to 2021-09-13T01)
  7. AGILE observations of two bright bursts from SGR 1935+2154
  8. Fermi GBM observation of another bright burst in the direction of SGR 1935+2154
  9. GECAM observations of bursts from SGR J1935+2154 (2021-09-11T07 to 2021-09-12T08)
  10. Fermi GBM observation of a bright flare in the direction of SGR 1935+2154
  11. Konus-Wind detection of the second intermediate flare from SGR 1935+2154
  12. IPN triangulation of a bright burst from SGR 1935+2154
  13. GECAM observations of a series of bursts from SGR J1935+2154
  14. Swift detection of a burst from SGR Swift J1555.2-5402
  15. GECAM observation of a burst from SGR J1935+2154
  16. GECAM observation of a burst from SGR J1935+2154
  17. GECAM observation of a burst from SGR J1555.2-5402
  18. Fermi GBM trigger 652585475 / 210906073 is not a GRB
  19. Fermi GBM observation of a burst from SGR J1555.2-5402
  20. POLAR detection of a SGR-like burst
  21. Swift detection of an outburst from SGR Swift J1555.2-5402
  22. GRB 210824A: Swift detection of a burst
  23. SGR 1935+2154: SPI INTEGRAL observations on 2021 August 5
  24. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 August 5
  25. IPN Triangulation of a bright burst from SGR 1935+2154
  26. GECAM detection of a short burst from SGR J1935+2154
  27. Recent activity of SGR 1935+2154 as observed by CGBM
  28. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 10
  29. GECAM detection of a short burst from SGR J1935+2154
  30. GECAM detection of a short burst from SGR J1935+2154
  31. GECAM detection of a short burst from SGR 1935+2154
  32. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 7
  33. GECAM detection of a short burst from SGR 1935+2154
  34. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 July 6
  35. Fermi GBM Observations of SGR J1935+2154
  36. Swift-BAT detection of a burst from SGR 1935+2154
  37. GECAM detection of a bright short burst from SGR 1935+2154
  38. INTEGRAL detection of a burst from SGR 1935+2154
  39. Fermi GBM observation of a bright burst in the direction of SGR 1935+2154
  40. Swift Trigger 1057131: detection of a burst from SGR Swift J1555.2-5402
  41. Fermi GRB 210615A: Global MASTER-Net observations report
  42. GRB 210610B: optical afterglow observations
  43. GECAM Sub-Threshold Detection of new magnetar Swift SGR J1555.2-5402
  44. Fermi GBM Sub-Threshold Detection of new Swift SGR J1555.2-5402
  45. SGR J1555.2-5402: Swift-BAT refined analysis
  46. Swift J1555.2-5402: Swift XRT refined analysis of the new SGR
  47. NICER discovery of 3.86 s pulsations from a new magnetar: SGR J1555.2-5402
  48. Swift Detection of probable new Swift SGR J1555.2-5402
  49. Fermi GBM observation of a bright burst from magneta
  50. GRB 210321A: CrAO optical upper limit
  51. GRB 210321A: Mondy optical observations
  52. Fermi/GBM observation of a burst from SGR 1830-0645
  53. Swift Trigger 1033144: Detection of SGR 1830-0645
  54. Swift Trigger 1032350: Detection of SGR 1830-0645
  55. GRB 210209A: Swift detection of a burst
  56. SGR 1935+2154: MAXI/GSC detection
  57. Fermi GBM Observations of a bright burst from SGR J1935+2154
  58. Recent activity of SGR 1935+2154 as observed by CGBM
  59. INTEGRAL detection of a short burst from SGR 1935+2154
  60. GECAM observations of SGR 1935+2154
  61. Fermi GBM Observations of SGR J1935+2154
  62. Konus-Wind detection of two bright bursts from SGR 1935+2154
  63. IPN triangulation of a bright burst from SGR 1935+2154
  64. GECAM detection of a short burst probably from SGR 1935+2154
  65. IPN triangulation of GRB 210124B (short)
  66. GRB 210119A (Swift J1851.2-6148): Swift-BAT refined analysis
  67. GECAM detection of a short GRB 210119A or a new SGR candidate Swift J1851.2-6148
  68. GRB 210119A: Fermi GBM observation
  69. Short Fermi GRB 210119A or new SGR Swift J1851.2-6148: Possible MASTER Short OT detection
  70. Swift detection of a new SGR Swift J1851.2-6148 or a short GRB 210119A
  71. GRB 201227A: continued Chilescope confirmation of variability of possible optical counterpart, redshift estimating
  72. GRB 201223A: Swift detection of a burst with a bright optical counterpart
  73. GRB 201216B: AGILE detection of a burst
  74. Swift Trigger 1005428: Detection of SGR 1830-0645
  75. Swift Trigger 1004219: Detection of SGR 1830-0645
  76. SGR 1830-0645: Swift/UVOT Upper Limits
  77. GRB 201011A: Fermi GBM detection of a likely Long GRB in the direction of SGR 1830-0645
  78. Fermi trigger No 624139481: AGILE detection
  79. SGR 1830-0645: pre-discovery detection in Swift/BAT
  80. SGR 1830-0645 / GRB 201010A: 1.5m OSN optical upper limit
  81. SGR 1830-0645: Swift-BAT refined analysis
  82. SGR 1830-0645 / GRB 201010A: Kitab optical non-detection
  83. Swift detection of a new SGR 1830-0645 or a short GRB 201010A
  84. GRB 200919A: Swift detection of a burst
  85. GRB 200819A: Swift detection of a burst
  86. AX J1846.4-0258: Swift-BAT refined analysis
  87. Swift Detection of an SGR-like flare from AX J1846.4-0258
  88. Fermi GBM trigger 616776657/200718619 is not a GRB
  89. Trigger 980513: Swift detection of SGR Swift J1818.0-1607
  90. GRB 200630A: Swift detection of a burst
  91. Updated catalog of X-ray bursts of SGR J1935+2154 from Insight-HXMT observations
  92. 1RXS J1708−4009: Swift-BAT refined analysis
  93. Swift detection of an SGR-like burst from 1RXS J1708−4009
  94. Swift J1818.0-1607: BOOTES-3/YA optical upper limit
  95. Swift Detection of a burst from SGR Swift J1818.0-1607
  96. AGILE detection of a burst from SGR 1935+2154 on May 10, 2020
  97. SGR 1935+2154: AstroSat CZTI detection
  98. Insight-HXMT's continued observation plan for SGR J1935+2154
  99. Konus-Wind observation of SGR 1935+2154 activity on 2020 May 10
  100. IPN triangulation of a bright burst from SGR 1935+2154 on 2020-05-10 at 06:12 UT

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