Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! 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"

618 results found.

  1. SGR 1935+2154: MAXI/GSC detection
  2. Fermi GBM observation of a bright flare from magnetar SGR 1935+2154
  3. Swift detection of multiple bursts from SGR 1935+2154
  4. Konus-Wind observation of a bright burst from SGR 1935+2154
  5. GRB 200415A (possible magnetar Giant Flare in Sculptor Galaxy): INTEGRAL observations
  6. IPN Triangulation of a bright burst from SGR 1935+2154
  7. bright SGR burst detected by CALET Gamma-Ray Burst Monitor
  8. Konus-Wind observation of GRB 200415A (a magnetar Giant Flare in Sculptor Galaxy?)
  9. Konus-Wind observation of a bright burst from SGR 1935+2154
  10. SGR 1935+2154: Fermi GBM observation
  11. IPN Triangulation of a bright burst from SGR 1935+2154
  12. SGR Swift J1818.0-1607: Swift-BAT refined analysis
  13. SGR Swift J1818.0-1607: BOOTES-4/MET optical limit
  14. Swift-BAT trigger 960986: Swift detection of a new SGR Swift J1818.0-1607
  15. Re-classification of Fermi GBM triggers 200203137, 200203156/GRB200203A and 200203861
  16. Konus-Wind observation of the recent SGR 1935+2154 activity
  17. Swift trigger 933276 MASTER observation
  18. Trigger 933285: Swift detection of the brightest burst so far from SGR 1935+2154
  19. Trigger 933276: Swift detection of further activity from SGR 1935+2154
  20. Fermi GBM GRB 191104C (trigger 594592184 / 191104854) is not a GRB
  21. Fermi GBM GRBs 191104 A, B, C and triggers 594534420/191104185 and 594563923/191104527 are not GRBs
  22. SGR 1935+2154: Swift-BAT refined analysis
  23. GRB 191104B/GRB 191104C are SGR 1935+2154
  24. Trigger 933083: Swift detection of SGR 1935+2154
  25. Fermi GBM triggers 594523229/191104056 and 594528816/191104120 are not GRBs
  26. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  27. Swift GRB190613.17 Global MASTER-Net observations report
  28. GRB 190326A: Swift XRT and UVOT follow-up observations
  29. GRB 190326A: Swift-BAT refined analysis - a soft-short GRB or an SGR
  30. GRB 180828A: Swift detection of a GRB or possible Galactic Transient Swift J1754.9-2548
  31. Fermi GBM triggers 552488966/180705548 and 552490104/180705561 are not GRBs
  32. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  33. Swift trigger 781740: Further analysis from Swift and Fermi/GBM
  34. Fermi-GBM Detection of possible burst from AXP CXOU J164710.2-455216/PSR J1647-4552
  35. Trigger 780207: Swift triggers again on AXP CXOU J164710.2-455216/PSR J1647-4552
  36. Fermi GBM Detection of possible burst from AXP 4U 0142+61
  37. GRB 170524A: Swift detection of a burst (or possible new SGR)
  38. GRB 160821B: Swift-BAT refined analysis
  39. GBM observation of SGR-like burst from the direction of PSR 1119-6127
  40. Trigger 706396: Swift detection of a short burst from PSR 1119-6127
  41. GRB 160703, GRB 160705, GRB 160720, SGR1935+2154: First SGRs and GRBs detected by Lomonosov.
  42. SGR 1935+2154: CALET Gamma-Ray Burst Monitor detections
  43. Konus-Wind observation of a bright burst from SGR 1935+2154
  44. SGR 1935+2154: AMI 15 GHz upper limits of the magnetar during outburst
  45. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  46. Swift-BAT refined analysis on the bright event from SGR 1935+2154
  47. Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
  48. GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
  49. Trigger 701182: Swift detection of SGR 1935+2154
  50. SGR 1617-5103 (BAT trigger 700791): Enhanced Swift-XRT position.
  51. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  52. Fermi GBM Trigger 160622573 is not a GRB
  53. GRB 160622A: Swift detection of a possible short GRB or a new SGR
  54. More FERMI GBM bursts from the magnetar SGR 1935+2154
  55. SGR 1935+2154: MAXI/GSC detection
  56. Fermi GBM trigger 488128598/160620637 is not a GRB
  57. Fermi GBM trigger 487974449/160618852 is not a GRB
  58. Trigger 689353 (possible transient near Sgr A*), Swift-BAT refined analysis
  59. Trigger 689353: Swift detection of a transient near Sgr A*
  60. Fermi GBM trigger 486562774/160602514 is not a GRB
  61. Another Swift detection of SGR 1935+2154 (trigger #687124)
  62. Swift detection of SGR 1935+2154
  63. Konus-Wind observation of a bright burst from SGR 1935+2154
  64. FERMI GBM bursts from the magnetar SGR 1935+2154
  65. SGR 1935+2154: AbAO optical upper limit
  66. Fermi GBM triggers of SGR 1935+2154
  67. Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
  68. Fermi GBM trigger 485124591/160516868 is not a GRB
  69. Trigger 686443: Swift detection of SGR 1935+2154
  70. Fermi GBM trigger 484906918/160514349 is not a GRB
  71. SGR 0755-2933, Swift-BAT refined analysis
  72. Swift detection of a likely new SGR: SGR 0755-2933
  73. IBAS Alert 7313 is SGR J1935+2154
  74. GRB 151221A: INTEGRAL detection of a short burst or possible SGR
  75. Swift-BAT refined analysis of trigger 664624 from SGR J1819-1600
  76. Swift-BAT probable detection of an outburst from SGR J1819-1600 (AX J1818.8-1559)
  77. SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
  78. Trigger 649113: Swift detection of SGR 1E 1841-045
  79. Swift-XRT observations of GRB 150710A
  80. Konus-Wind observation of a bright burst from SGR 1935+2154
  81. IPN Triangulation of a bright burst from SGR 1935+2154
  82. GRB 150301A: Swift-BAT refined analysis
  83. GRB 150301A: Fermi GBM observation
  84. GRB 150301A: Swift detection of a short burst or new SGR
  85. Fermi GBM Observations of SGR 1935+2154
  86. Fermi GBM trigger 150223068 is not a GRB
  87. SGR 1935+2154: Swift-BAT refined analysis
  88. Swift detection of an outburst from SGR 1935+2154
  89. Trigger 607399: Swift detection of SGR1806-20
  90. Fermi GBM Observations of SGR 1935+2154
  91. GRB 140705A / SGR 1935+2154: VLA 6 GHz observations
  92. Pre-discovery observations of SGR 1935+2154 in Swift archival data
  93. GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
  94. SGR 1935+2154: Swift-BAT observations of additional short soft events
  95. GRB 140705A / SGR 1935+2154: FTN observations
  96. GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
  97. GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154
  98. Fermi GBM Trigger 140429551 - Detection of a burst from SGR 1806-20
  99. Trigger 597570: Swift detection of SGR 1806-20
  100. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
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