Skip to main content
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"

5059 results found.

  1. GRB 220316A: AstroSat CZTI detection
  2. GRB 220320A: AstroSat CZTI detection
  3. GRB 220319A: MITSuME Akeno optical upper limits
  4. GRB 220319A: Mondy optical uper limit
  5. GRB 220319A: MASTER Global Robotic Net optical observations
  6. Fermi-LAT Gamma-ray Observations of IceCube-220317A
  7. IceCube-220317A: Upper limits from a search for additional neutrino events in IceCube
  8. GRB 220317A: Swift/BAT-GUANO detection outside the coded FOV
  9. GRB 220310A: MITSuME Akeno optical observation
  10. IceCube-220317A: MASTER Global Robotic Net optical observations
  11. IceCube-220317A - IceCube observation of a high-energy neutrino candidate track-like event
  12. GRB 220315A: MASTER Global Robotic Net optical observations
  13. GRB 220311A: MITSuME Akeno optical upper limits
  14. GRB 220310A: K-800 of Terskol observatory optical upper limit
  15. GRB 220310A: [KAO-Egypt] SDSS r, i observation
  16. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  17. Integral GRB220311.69: Global MASTER-Net observations report
  18. Integral GRB220311.69: Global MASTER-Net observations report
  19. Integral GRB220311.69: Global MASTER-Net OT detection
  20. ZTF22aabjpxh/AT2022cva (GRB 220219B): evidence of supernova in LBT spectra
  21. GRB 220306B: Nanshan/NEXT optical upper limit
  22. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, possible photometric evidence of SN
  23. Fermi GBM Detection of GRB 220308A
  24. GRB 220308A: AGILE detection
  25. GRB 220310A: MASTER optical counterpart detection
  26. Fermi GRB 220310B: Global MASTER-Net observations report
  27. GRB 220310A: MAXI/GSC detection
  28. MAXI GRB220310.02: Global MASTER-Net observations report
  29. IceCube-220306A: No significant detection in HAWC
  30. IceCube-220303A: No significant detection in HAWC
  31. Fermi GRB 220309A: Global MASTER-Net observations report
  32. GRB 220308A: Swift/BAT-GUANO detection outside the coded FOV
  33. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  34. Fermi trigger No 668410535: Global MASTER-Net observations report
  35. GRB 220306B: Tautenburg observations
  36. IceCube-220306A: Upper limits from a search for additional neutrino events in IceCube
  37. IceCube-220304A: Upper limits from a search for additional neutrino events in IceCube
  38. Fermi-LAT Gamma-ray Observations of IceCube-220306A
  39. GRB 220306B: AbAO optical observations, possible afterglow candidate
  40. Fermi-LAT Gamma-ray Observations of IceCube-220304A
  41. Swift GRB 220306B: Global MASTER-Net observations report
  42. Fermi GRB 220306A: Global MASTER-Net observations report
  43. IceCube-220306A - IceCube observation of a high-energy neutrino candidate track-like event
  44. Fermi GRB 220305A: Global MASTER-Net observations report
  45. IceCube-220303A: One X-ray counterpart from Swift/XRT follow up observations
  46. Swift GRB 220305A: Global MASTER-Net observations report
  47. GRB 220305A: Swift-XRT observations
  48. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, SN signature search
  49. IceCube-220303A: Upper limits from a search for additional neutrino events in IceCube
  50. Fermi-LAT Gamma-ray Observations of IceCube-220303A
  51. IceCube-220304A - IceCube observation of a high-energy neutrino candidate track-like event
  52. IceCube Alert 220304.74: Global MASTER-Net observations report
  53. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  54. Fermi GRB 220304A: Global MASTER-Net observations report
  55. Tev Blazar as possible optical counterpart of the high-energy neutrino IceCube-220303A
  56. IceCube Alert 220303.75: Global MASTER-Net observations report
  57. IceCube-220303A - IceCube observation of a high-energy neutrino candidate track-like event
  58. Swift GRB 220302A: Global MASTER-Net observations report
  59. IceCube-220225A: Upper limits from a search for additional neutrino events in IceCube
  60. ZTF22aaajecp/AT2022cmc: DECam Photometry
  61. GRB 220219B: Swift-XRT observations
  62. Fermi GRB 220223A: Global MASTER-Net observations report
  63. ZTF22aabjpxh/AT2022cva: NICER X-ray detection is consistent with a GRB afterglow
  64. Fermi GRB 220222A: Global MASTER-Net observations report
  65. ZTF22aabjpxh/AT2022cva: ZTF Discovery of a Rapidly Fading Transient with a Likely Long-GRB Counterpart
  66. IceCube Alert 220220.60: Global MASTER-Net observations report
  67. ZTF22aaajecp/AT2022cmc: NICER X-ray detection
  68. GRB 220211A: MASTER optical observations of ZTF22aaajecp/AT2022cmc
  69. Fermi trigger No 666489765: Global MASTER-Net observations report
  70. GRB 220210A: BOOTES-5/JGT optical afterglow candidate
  71. IceCube-220205B - IceCube observation of a high-energy neutrino candidate track-like event
  72. IceCube-220202A: Upper limits from a search for additional neutrino events in IceCube
  73. GRB 220128A: AstroSat CZTI detection
  74. Konus-Wind detection of GRB 220128A
  75. IPN triangulation of GRB 220128A (long)
  76. Konus-Wind detection of GRB 220124A
  77. IPN triangulation of GRB 220124A
  78. GRB 220124A: AstroSat CZTI detection of a bright long GRB
  79. IPN triangulation of a bright burst from SGR 1935+2154
  80. IPN triangulation of GRB 211226A
  81. GRB 220118A: MITSuME Akeno optical observation
  82. IceCube-220115A: Upper limits from a search for additional neutrino events in IceCube
  83. Fermi trigger No 663966693: Global MASTER-Net observations report
  84. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  85. GECAM observations of a series of bursts from SGR J1935+2154
  86. GRB 220101A: continued 1.3m DFOT optical observations of a high-redshift afterglow
  87. Fermi trigger No 663658976: Global MASTER-Net observations report
  88. Fermi GRB 220111A: Global MASTER-Net observations report
  89. GRB 220107A: SAO RAS optical observations
  90. GRB 220101A: Additional Liverpool telescope photometry
  91. GRB 220107A: SAO RAS optical observations
  92. Fermi GRB 220107A: Global MASTER-Net observations report
  93. Fermi trigger No 663129379: Global MASTER-Net observations report
  94. GRB 220101A: LCO Continued Optical Observations
  95. Fermi GRB 220103A: Global MASTER-Net observations report
  96. GRB 220103A: Fermi GBM Final Real-time Localization
  97. Alert from the HAWC Burst Monitor HAWC-220103A
  98. GRB 220101A: LCO Optical Observations
  99. GRB 220101A: Asiago spectroscopic and photometric detection
  100. GRB 211229A: Fermi GBM observation

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