Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

24619 results found.

  1. IceCube-211208A: Upper limits from a search for additional neutrino events in IceCube
  2. Fermi-LAT Gamma-ray Observations of IceCube-211208A
  3. IceCube-211208A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  4. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-211209A
  5. IceCube-211208A - IceCube observation of a high-energy neutrino candidate track-like event
  6. IceCube Alert 211208.84: Global MASTER-Net observations report
  7. GRB 211207A: Swift-BAT refined analysis
  8. GRB 211207A: VLT/X-shooter redshift
  9. Chandra observation of GW170817 at ~1573 days since merger (Epoch 1 of 4)
  10. GRB 211204C: Fermi GBM detection
  11. Swift GRB 211207A: Global MASTER-Net observations report
  12. GRB 211207A: Swift detection of a burst with an optical counterpart
  13. GRB 211206A: Not observable by Fermi-GBM
  14. IPN triangulation of GRB 211204C
  15. GRB 211206A: Swift/BAT-GUANO detection outside the coded FOV
  16. GRB 211204C: Swift/BAT-GUANO detection outside the coded FOV
  17. GRB 211204C: GECAM detection
  18. Fermi GRB 211204C: Global MASTER-Net observations report
  19. GRB 211204C: Fermi GBM Final Real-time Localization
  20. Fermi GRB 211204B: Global MASTER-Net observations report
  21. GRB 211204B: Fermi GBM Final Real-time Localization
  22. Fermi GRB 211204A: Global MASTER-Net observations report
  23. GRB 211204A: Fermi GBM Final Real-time Localization
  24. GRB 211124A: Fermi GBM Observation
  25. Swift GRB 211203A: Global MASTER-Net observations report
  26. Fermi GBM Upper limits for GRB 211203A
  27. Konus-Wind detection of GRB 211130A
  28. IPN triangulation of GRB 211130A
  29. GRB 211201A: GECAM detection
  30. GRB 211201A: Swift/BAT-GUANO detection likely outside the coded FOV
  31. GRB 211106A: Second HST Observation
  32. Fermi GRB 211201A: Global MASTER-Net observations report
  33. GRB 211201A: Fermi GBM Final Real-time Localization
  34. Fermi GRB 211130A: Global MASTER-Net observations report
  35. IceCube-211125A: No significant detection in HAWC
  36. GRB 211130A: BALROG localization (Fermi Trigger 659978192 / GRB 211130636)
  37. GRB 211130A: Fermi GBM Final Real-time Localization
  38. GRB 211106A: GECAM detection
  39. GRB 211129A: Swift-BAT refined analysis
  40. GRB 211129A: Swift-XRT refined Analysis
  41. GRB 211106A: HST Observations
  42. IceCube-Cascade 211128A: Upper limits from a search for additional neutrino events in IceCube
  43. IceCube-211125A: Upper limits from a search for additional neutrino events in IceCube
  44. GRB 211129A: Fermi GBM observation
  45. Swift GRB 211129A: Global MASTER-Net observations report
  46. IPN triangulation of GRB 211118A
  47. GRB 211129A: MITSuME Akeno optical upper limits
  48. GRB 211129A: Swift detection of a burst
  49. IceCube-211125A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  50. GRB 211023A: Xinglong 2.16m optical observations
  51. Fermi-LAT Gamma-ray Observations of IceCube-211125A
  52. GRB 211120548: Fermi GBM observation
  53. Konus-Wind detection of GRB 211120A
  54. IPN triangulation of GRB 211120A
  55. IceCube-211125A: No neutrino counterpart detected with ANTARES
  56. IceCube-211125A: IceCube observation of a high-energy neutrino candidate track-like event
  57. GRB 211118A: Fermi GBM detection
  58. IceCube Alert 211125.27: Global MASTER-Net observations report
  59. Fermi-LAT Gamma-ray Observations of IceCube-211123A
  60. IceCube-211123A: Upper limits from a search for additional neutrino events in IceCube
  61. IceCube-211123A: INTEGRAL was inactive at the time of the event
  62. IceCube-211123A: Upper limits from Fermi-GBM Observations
  63. IceCube-211117A: not observable by Fermi-GBM
  64. IceCube-211116A: not observable by Fermi-GBM
  65. IceCube-211023A: not observable by Fermi-GBM
  66. IPN triangulation of GRB 211124A (short)
  67. HAWC-211123A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  68. HAWC-211123A: not observable by Fermi-GBM
  69. GRB 211124A: Swift/BAT-GUANO detection of a short burst outside the coded FOV
  70. IceCube Alert 211123.60: Global MASTER-Net observations report
  71. HAWC-211123A: No neutrino counterpart detected with ANTARES
  72. IceCube-211123A - IceCube observation of a high-energy neutrino candidate track-like event
  73. Fermi trigger No 659413798: Global MASTER-Net observations report
  74. GRB 211023B: LBT likely spectroscopic redshift of the host galaxy
  75. Alert from the HAWC Burst Monitor HAWC-211123A
  76. GRB 211120A: AGILE detection
  77. Fermi trigger No 659183098: Global MASTER-Net observations report
  78. Fermi trigger No 659106591: Global MASTER-Net observations report
  79. GRB 211120B: Swift/BAT-GUANO detection outside the coded FOV
  80. GRB 211120A: GECAM detection
  81. GRB 211023A: optical observations and photometric evidence of supernova
  82. Fermi-LAT Gamma-ray Observations of IceCube-211117A
  83. GRB211118A: Swift/BAT-GUANO detection outside the coded FOV
  84. Fermi trigger No 658971499: Global MASTER-Net observations report
  85. Search for counterpart to IceCube-211117A with ANTARES
  86. IceCube-211117A : IceCube observation of a high-energy neutrino candidate track-like event
  87. IceCube-211116A: Upper limits from a search for additional neutrino events in IceCube
  88. Fermi-LAT Gamma-ray Observations of IceCube-211116A
  89. IceCube-211116A: No neutrino counterpart detected with ANTARES
  90. IceCube Alert 211116.44: Global MASTER-Net observations report
  91. Fermi trigger No 658755664: Global MASTER-Net observations report
  92. Fermi trigger No 658764238: Global MASTER-Net observations report
  93. IceCube-211116A : IceCube observation of a high-energy neutrino candidate track-like event
  94. GRB 211115A: CALET Gamma-Ray Burst Monitor detection
  95. Fermi trigger No 658686687: Global MASTER-Net observations report
  96. GRB 211023A: classification and SPI-ACS/INTEGRAL registration
  97. Fermi GRB 211112A: Global MASTER-Net observations report
  98. IPN triangulation of GRB 211106A (short)
  99. GRB 211112A: Fermi GBM Final Real-time Localization
  100. Short GRB 211106A: spectroscopy of galaxies in the field

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