Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. 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"

21471 results found.

  1. GRB 240218A: VLT/X-shooter redshift of z = 6.782
  2. GRB 240218A: Fermi GBM Detection
  3. GRB 240215A: Fermi GBM Observation
  4. GRB 240215B: GRBAlpha detection
  5. IPN triangulation of GRB 240209A
  6. GRB 240218A: Enhanced Swift-XRT position
  7. GRB 240218A: REM detection of a NIR afterglow candidate
  8. GRB 240218A : r-band upper limit from Observatoire de Haute-Provence
  9. GRB240218A: VLT/X-shooter upper limits
  10. GRB 240218A: Swift detection of a burst
  11. Swift GRB240218.08: Global MASTER-Net observations report
  12. GRB 240215B: Swift/BAT-GUANO detection of a burst outside the coded FOV
  13. Swift Triggers 12156887-1215690 are not astrophysical events.
  14. GRB 240215A: Tiled Swift observations
  15. GRB 240215A: Swift/BAT-GUANO localization of a burst
  16. GRB 240128A: Further Swift-XRT observations
  17. GRB 240214A: Tiled Swift observations
  18. GRB 240214A/1H 0451-560: MAXI/GSC detection
  19. Konus-Wind detection of GRB 240204A
  20. IPN triangulation of GRB 240205A (short)
  21. GRB 240205B: PRIME near infrared detection
  22. Swift Trigger 1213872 is not an astrophysical event
  23. GRB240204A: Swift/UVOT Upper Limits
  24. GRB 240205B: AstroSat CZTI detection
  25. GRB 240205B: Swift-BAT refined analysis
  26. Konus-Wind detection of GRB 240205B (long / very soft)
  27. GRB 240205B: VLT/X-shooter redshift
  28. GRB 240205B: CALET Gamma-Ray Burst Monitor detection
  29. GRB 240205B: BOOTES-6 optical afterglow follow-up
  30. GRB 240205B: ATCA detection of radio counterpart
  31. GRB 240205B: REM detection of the optical/NIR afterglow
  32. GRB 240205B: Fermi GBM Observation
  33. GRB 240204A: AstroSat CZTI detection
  34. GRB 240205B: GECAM detection of a long burst
  35. GRB 240204A: Swift-BAT refined analysis
  36. GRB 240205B: Skynet Optical Afterglow Observations
  37. GRB 240205B: BOOTES-7 optical afterglow follow-up
  38. GRB 240205B: MASTER OT J232550.14-550704.6 counterpart detection
  39. GRB 240205B: Swift detection of a burst
  40. Swift GRB240205.93: Global MASTER-Net observations report
  41. GRB 240204A: Fermi GBM Observation
  42. GRB 240204A: Osservatorio Astronomico Nastro Verde upper limit
  43. GRB 240204A: optical afterglow detection with LCOGT 1m telescopes at Sutherland and Teide Observatories
  44. GRB 240204A: Montarrenti Observatory optical observations
  45. GRB 240204A: Enhanced Swift-XRT position
  46. GRB 240204A: Mondy optical afterglow candidate
  47. GRB 240204A: Swift detection of a burst
  48. Swift Trigger 1212791 is not an astrophysical event.
  49. Swift-BAT triggers 1212787, 1212789 are not astrophysical.
  50. IPN triangulation of GRB 240124B
  51. GRB 240129A: Fermi GBM Observation
  52. GRB 240129A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  53. IPN triangulation of GRB 240125A (short)
  54. GRB 240128A: Swift-XRT observations
  55. GRB 240128A: Tiled Swift observations
  56. GRB 240122A: ATCA detection of radio counterpart
  57. Swift Trigger 1211211 and 1211212 are not astrophysical
  58. GRB 240123C: AstroSat CZTI detection
  59. GRB240122A: PRIME near infrared detection
  60. GRB 240123B: Fermi GBM Observation
  61. GRB 240123A: Glowbug gamma-ray detection
  62. GRB 240123B: Swift/BAT-GUANO detection of a long burst
  63. GRB 240123A: GRBAlpha detection
  64. IPN triangulation of GRB 240123C (short)
  65. Swift trigger 1210856 is not astrophysical
  66. GRB 240123A: Swift-BAT refined analysis
  67. GRB 240123A : MITSuME Akeno optical afterglow candidate detection
  68. GRB 240123A: Enhanced Swift-XRT position
  69. GRB 240122A: Swift/UVOT Upper Limits
  70. GRB 240123A: Swift-XRT refined Analysis
  71. GRB 240122A: BOOTES-2/TELMA optical upper limit and 1.5m OSN detection
  72. Fermi GBM Sub-Threshold Detection of GRB 240123A
  73. GRB 240118A: Swift/UVOT Upper Limits
  74. GRB 240123A: Swift detection of a burst with a possible optical counterpart
  75. Swift GRB240123.46: Global MASTER-Net observations report
  76. GRB 240122A: Swift-XRT afterglow detection
  77. GRB 240122A: Tiled Swift observations
  78. IPN triangulation of GRB 240119A (short)
  79. GRB 240118C: GECAM-B detection of a long burst
  80. GRB 240118A: Mondy optical observations
  81. GRB 240118A: Swift-XRT afterglow detection
  82. GRB 240118C: Fermi GBM Observation
  83. GRB 240118C: Swift/BAT-GUANO detection of a burst
  84. GRB 240118A: GRBAlpha detection
  85. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-240118A: correction on the localization
  86. GRB 240115A: Fermi GBM Observation
  87. Swift triggers 1209631, 1209632, 1209635 and 1209644 are not interesting astrophysical events
  88. GRB 240118A: Swift ToO observations
  89. GRB 240118A: AbAO optical upper limit
  90. GRB 240118A: NuSTAR Offline Analysis of the GRB
  91. GRB 240118A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  92. Konus-Wind detection of GRB 240118A
  93. AMON Coincidence Alert from the sub-threshold IceCube-HAWC search NuEm-240118A
  94. GRB 240118A: NuSTAR Detection of a Long GRB
  95. GRB 240118A: Fermi GBM Observation
  96. GRB 240118A: Fermi-LAT detection
  97. GRID detection of GRB 231230A
  98. GRB 240118A: Fermi GBM Final Real-time Localization
  99. GRB 240115A: Swift/BAT-GUANO detection of a short burst
  100. Swift Trigger 1209406 is not an astrophysical event

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