Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

11112 results found.

  1. GRB 200524A: Fermi-LAT detection
  2. Konus-Wind detection of short/hard GRB 200521A
  3. IPN triangulation of GRB 200521A (short)
  4. IceCube-200523A: Upper limits from Fermi-GBM Observations
  5. IceCube-200523A - IceCube observation of a high-energy neutrino candidate event
  6. Fermi GRB 200522B: Global MASTER-Net observations report
  7. GRB 200522B: Fermi GBM Final Real-time Localization
  8. GRB 200514B: Fermi GBM observation
  9. Fermi trigger No 611676654: Global MASTER-Net observations report
  10. Fermi trigger No 611605955: Global MASTER-Net observations report
  11. Fermi GBM Sub-Threshold Detection of GRB 200517A
  12. IPN triangulation of GRB 200514B (short)
  13. Fermi trigger No 611434353: Global MASTER-Net observations report
  14. GRB 200514B: BALROG localization (Fermi Trigger 611140062 / GRB 200514380)
  15. GRB 200514B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 611140062) - More Candidates
  16. GRB200514B: YSE detection of ZTF20aazpphd
  17. Optical transient ZTF20aazpphd is unrelated to GRB 200514B
  18. GRB 200514B: GROWTH-India follow-up of ZTF20aazpphd (AT2020jww)
  19. GRB200514B: ATLAS detections of ZTF20aazpphd
  20. GRB200514B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 611140062)
  21. GRB 200514B: Fermi GBM Final Real-time Localization
  22. Fermi GBM Sub-Threshold Detection of GRB 200512A
  23. Fermi-LAT Gamma-ray Observations of IceCube-200512A
  24. IceCube-200512A: not observable by Fermi-GBM
  25. GRB 200510A: AstroSat CZTI detection
  26. IPN triangulation of a bright burst from SGR 1935+2154 on 2020-05-10 at 06:12 UT
  27. GRB 200510A: BALROG localization (Fermi Trigger 610800081 / GRB 200510445)
  28. GRB 200510A: Fermi GBM Final Real-time Localization
  29. GRB 200509C: Fermi GBM Final Real-time Localization
  30. GRB 200509B: Fermi GBM Final Real-time Localization
  31. GRB 200507A: Fermi GBM Final Real-time Localization
  32. GRB 200506A: AstroSat CZTI detection
  33. GRB 200506C: AstroSat CZTI detection
  34. GRB 200505A: AGILE detection
  35. GRB 200506C: Fermi GBM Final Real-time Localization
  36. GRB 200506B: Fermi GBM Final Real-time Localization
  37. GRB 200506A: Fermi GBM Final Real-time Localization
  38. GRB 200505A: Fermi GBM Final Real-time Localization
  39. Insight-HXMT detection of a short bright burst from SGR 1935+2154
  40. GRB 200502A: AstroSat CZTI detection
  41. GRB 200502A: AGILE observations
  42. GRB 200503B: BALROG localization (Fermi Trigger 610219118 / GRB 200503721)
  43. GRB 200503B: Fermi GBM Final Real-time Localization
  44. GRB 200502A: Fermi GBM Final Real-time Localization
  45. Fermi GBM observation of a flare from the magnetar SGR 1806-20
  46. GRB 200501A: Fermi GBM Final Real-time Localization
  47. Fermi GBM trigger 200429866/609886052 is not a GRB
  48. Konus-Wind observation of a very intense bursting activity of SGR 1935+2154
  49. A Forest of Bursts from SGR 1935+2154
  50. high bursting activity of SGR 1935+2154: CGBM observations
  51. SGR 1935+2154 the Insight-HXMT observation plan
  52. Fermi GBM observation of a bright flare from magnetar SGR 1935+2154
  53. IceCube-200425A: Upper limits from Fermi-GBM Observations
  54. Fermi-LAT Gamma-ray Observations of IceCube-200425A
  55. Gagarin-day GRB 200412B: observations with the 3.6m Devasthal Optical Telescope
  56. IceCube-200425A - IceCube observation of a high-energy neutrino candidate event
  57. IPN triangulation of GRB 200423A (short)
  58. GRB 200425B: Fermi GBM Final Real-time Localization
  59. Fermi GRB 200423A: Global MASTER-Net observations report
  60. GRB 200423A: Fermi GBM Final Real-time Localization
  61. GRB 200415A (possible magnetar Giant Flare in Sculptor Galaxy): INTEGRAL observations
  62. IPN Triangulation of a bright burst from SGR 1935+2154
  63. bright SGR burst detected by CALET Gamma-Ray Burst Monitor
  64. Fermi-LAT Gamma-ray Observations of IceCube-200421A
  65. Fermi GRB 200421A: Global MASTER-Net observations report
  66. GRB 200421A: Fermi GBM Final Real-time Localization
  67. IceCube-200421A: not observable by Fermi-GBM
  68. IceCube-200421A - IceCube observation of a high-energy neutrino candidate event
  69. GRB 200412B: continued Mondy and Terskol optical observations
  70. GRB 200420: Fermi GBM Final Localization Correction
  71. Fermi GRB 200420A: Global MASTER-Net observations report
  72. GRB 200420A: Fermi GBM Final Real-time Localization
  73. Fermi trigger No 608935505: Global MASTER-Net observations report
  74. GRB 200412B: continued Terskol optical observations
  75. GRB 200412B: continued AbAO, Mondy, TSHAO, Terskol optical observations
  76. GRB200412B: GROWTH India detection of afterglow
  77. GRB 200415A: Fermi-LAT localization update
  78. Konus-Wind observation of GRB 200415A (a magnetar Giant Flare in Sculptor Galaxy?)
  79. Improved IPN error box for GRB 200415A (consistent with the Sculptor Galaxy)
  80. GRB 200412B: continued Tautenburg observations
  81. GRB 200416A: Fermi GBM observation
  82. Fermi GRB 200415A: Global MASTER-Net observations report
  83. GRB 200411A: Chandra observations indicative of temporal steepening
  84. GRB 200412A : AstroSat CZTI detection
  85. GRB 200415A: Fermi GBM observation
  86. GRB 200415A: Fermi-LAT detection
  87. IPN triangulation of GRB 200415A (possible Magnetar Giant Flare in Sculptor Galaxy?)
  88. GRB 200412B: Mondy optical observations
  89. GRB 200412B: continued Tautenburg observations
  90. Konus-Wind observation of GRB 200412B
  91. GRB 200415A: BALROG localization (Fermi Trigger 608633290 / GRB 200415367)
  92. GRB 200415A: Fermi GBM Final Real-time Localization
  93. Konus-Wind observation of GRB 200412A
  94. GRB 200412B: MITSuME Akeno optical observation
  95. GRB 200412B: Tautenburg observations
  96. GRB 200412B: contunued AbAO optical observations
  97. GRB 200411A: ATCA 5/9 GHz radio observations
  98. GRB 200412B: CALET Gamma-Ray Burst Monitor detection
  99. GRB 200412B: Xinglong TNT optical observations
  100. GRB 200412B: SAO RAS observations of OT

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