Skip to main content
Due to the lapse in federal government funding, NASA is not updating this website. See the Operations FAQ for GCN impacts.
New! Super-Kamiokande JSON Notices and Schema v4.5.0. See news and announcements

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"

606 results found.

  1. Konus-Wind observation of a bright burst from SGR 1935+2154
  2. SGR 1935+2154: Fermi GBM observation
  3. IPN Triangulation of a bright burst from SGR 1935+2154
  4. SGR Swift J1818.0-1607: Swift-BAT refined analysis
  5. SGR Swift J1818.0-1607: BOOTES-4/MET optical limit
  6. Swift-BAT trigger 960986: Swift detection of a new SGR Swift J1818.0-1607
  7. Re-classification of Fermi GBM triggers 200203137, 200203156/GRB200203A and 200203861
  8. Konus-Wind observation of the recent SGR 1935+2154 activity
  9. Swift trigger 933276 MASTER observation
  10. Trigger 933285: Swift detection of the brightest burst so far from SGR 1935+2154
  11. Trigger 933276: Swift detection of further activity from SGR 1935+2154
  12. Fermi GBM GRB 191104C (trigger 594592184 / 191104854) is not a GRB
  13. Fermi GBM GRBs 191104 A, B, C and triggers 594534420/191104185 and 594563923/191104527 are not GRBs
  14. SGR 1935+2154: Swift-BAT refined analysis
  15. GRB 191104B/GRB 191104C are SGR 1935+2154
  16. Trigger 933083: Swift detection of SGR 1935+2154
  17. Fermi GBM triggers 594523229/191104056 and 594528816/191104120 are not GRBs
  18. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  19. LIGO/Virgo S190513bm: Fermi-LAT search for a high-energy gamma-ray counterpart
  20. LIGO/Virgo S190425z: Fermi-LAT search for a high-energy gamma-ray counterpart
  21. GRB 190326A: Swift XRT and UVOT follow-up observations
  22. GRB 190326A: Swift-BAT refined analysis - a soft-short GRB or an SGR
  23. GRB 180828A: Swift detection of a GRB or possible Galactic Transient Swift J1754.9-2548
  24. Fermi GBM triggers 552488966/180705548 and 552490104/180705561 are not GRBs
  25. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  26. Swift trigger 781740: Further analysis from Swift and Fermi/GBM
  27. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  28. Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
  29. Fermi GBM Detection of possible burst from AXP 4U 0142+61
  30. GRB 170524A: Swift detection of a burst (or possible new SGR)
  31. GRB 160821B: Swift-BAT refined analysis
  32. GBM observation of SGR-like burst from the direction of PSR 1119-6127
  33. Trigger 706396: Swift detection of a short burst from PSR 1119-6127
  34. GRB 160703, GRB 160705, GRB 160720, SGR1935+2154: First SGRs and GRBs detected by Lomonosov.
  35. SGR 1935+2154: CALET Gamma-Ray Burst Monitor detections
  36. Konus-Wind observation of a bright burst from SGR 1935+2154
  37. SGR 1935+2154: AMI 15 GHz upper limits of the magnetar during outburst
  38. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  39. Swift-BAT refined analysis on the bright event from SGR 1935+2154
  40. Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
  41. GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
  42. Trigger 701182: Swift detection of SGR 1935+2154
  43. SGR 1617-5103 (BAT trigger 700791): Enhanced Swift-XRT position.
  44. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  45. Fermi GBM Trigger 160622573 is not a GRB
  46. GRB 160622A: Swift detection of a possible short GRB or a new SGR
  47. More FERMI GBM bursts from the magnetar SGR 1935+2154
  48. SGR 1935+2154: MAXI/GSC detection
  49. Fermi GBM trigger 488128598/160620637 is not a GRB
  50. Fermi GBM trigger 487974449/160618852 is not a GRB
  51. Trigger 689353 (possible transient near Sgr A*), Swift-BAT refined analysis
  52. Trigger 689353: Swift detection of a transient near Sgr A*
  53. Fermi GBM trigger 486562774/160602514 is not a GRB
  54. Another Swift detection of SGR 1935+2154 (trigger #687124)
  55. Swift detection of SGR 1935+2154
  56. Konus-Wind observation of a bright burst from SGR 1935+2154
  57. FERMI GBM bursts from the magnetar SGR 1935+2154
  58. SGR 1935+2154: AbAO optical upper limit
  59. Fermi GBM triggers of SGR 1935+2154
  60. Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
  61. Fermi GBM trigger 485124591/160516868 is not a GRB
  62. Trigger 686443: Swift detection of SGR 1935+2154
  63. Fermi GBM trigger 484906918/160514349 is not a GRB
  64. SGR 0755-2933, Swift-BAT refined analysis
  65. Swift detection of a likely new SGR: SGR 0755-2933
  66. IBAS Alert 7313 is SGR J1935+2154
  67. GRB 151221A: INTEGRAL detection of a short burst or possible SGR
  68. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  69. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  70. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  71. Trigger 649113: Swift detection of SGR 1E 1841-045
  72. Swift-XRT observations of GRB 150710A
  73. Konus-Wind observation of a bright burst from SGR 1935+2154
  74. IPN Triangulation of a bright burst from SGR 1935+2154
  75. GRB 150301A: Swift-BAT refined analysis
  76. GRB 150301A: Fermi GBM observation
  77. GRB 150301A: Swift detection of a short burst or new SGR
  78. Fermi GBM Observations of SGR 1935+2154
  79. Fermi GBM trigger 150223068 is not a GRB
  80. SGR 1935+2154: Swift-BAT refined analysis
  81. Swift detection of an outburst from SGR 1935+2154
  82. Trigger 607399: Swift detection of SGR1806-20
  83. Fermi GBM Observations of SGR 1935+2154
  84. GRB 140705A / SGR 1935+2154: VLA 6 GHz observations
  85. Pre-discovery observations of SGR 1935+2154 in Swift archival data
  86. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  87. SGR 1935+2154: Swift-BAT observations of additional short soft events
  88. GRB 140705A / SGR 1935+2154: FTN observations
  89. GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
  90. GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154
  91. Fermi GBM Trigger 140429551 - Detection of a burst from SGR 1806-20
  92. Trigger 597570: Swift detection of SGR 1806-20
  93. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  94. INTEGRAL detection of a SGR-like burst likely from SGR J1745-29
  95. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  96. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  97. Trigger 565443: Swift detection of a burst from SGR J1745-29
  98. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  99. Trigger 557640: Swift detection of burst from SGR J1745-29
  100. Fermi Trigger 130507.091 - Detection of a SGR-like Burst

Advanced

Download all Circulars as a .tar.gz archive:
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov