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"

21525 results found.

  1. GRB 220306B: Swift/UVOT Upper Limits
  2. GRB 220310C: Fermi GBM observation
  3. GRB 210722A: TAROT Reunion observatory optical light curve
  4. GRB 210222B: TAROT Reunion observatory optical light curve
  5. GRB 201021C: TAROT Reunion observatory optical light curve
  6. GRB 220310C: Swift-XRT observations
  7. GRB 220310C: Swift ToO observations
  8. GRB 220310C: Swift/BAT-GUANO candidate arcminute localization
  9. GRB 220306B: Nanshan/NEXT optical upper limit
  10. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, possible photometric evidence of SN
  11. Fermi GBM Detection of GRB 220308A
  12. GRB 220308A: AGILE detection
  13. GRB 220310A: Swift ToO observations
  14. Konus-Wind detection of GRB 220308A
  15. GRB 220308A: Swift/BAT-GUANO detection outside the coded FOV
  16. IPN triangulation of GRB 220308A (long / very bright)
  17. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  18. GRB 220306B: Tautenburg observations
  19. GRB 220304A Fermi GBM detection
  20. GRB 220306B: Swift-BAT refined analysis
  21. GRB 220306B: AbAO optical observations, possible afterglow candidate
  22. GRB 220306B: BOOTES-1 optical upper limit
  23. GRB 220306B: Swift-XRT refined Analysis
  24. GRB 220306B: Fermi GBM observation
  25. GRB 220306B: Enhanced Swift-XRT position
  26. Swift GRB 220306B: Global MASTER-Net observations report
  27. GRB 220305A: Swift-BAT refined analysis
  28. GRB 220306B: Swift detection of a burst
  29. Fermi GBM Sub-Threshold Detection of GRB 220305A
  30. GRB 220305A: Swift-XRT refined Analysis
  31. GRB 220305A: Enhanced Swift-XRT position
  32. IceCube-220303A: One X-ray counterpart from Swift/XRT follow up observations
  33. Swift GRB 220305A: Global MASTER-Net observations report
  34. GRB 220305A: Swift-XRT observations
  35. GRB 220305A: Swift detection of a burst
  36. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, SN signature search
  37. GRB 220302A: Swift/UVOT Upper Limits
  38. GRB 220304A: Swift/BAT-GUANO detection outside the coded FOV
  39. GRB 220302A: Swift-XRT refined Analysis
  40. GRB 220302A: BOOTES-5/JGT optical upper limit
  41. Swift resumes autonomous slewing
  42. GRB 220302A: Enhanced Swift-XRT position
  43. GRB 220302A: Swift afterglow detection
  44. GRB 220222A: CALET Gamma-Ray Burst Monitor detection
  45. Swift GRB 220302A: Global MASTER-Net observations report
  46. GRB 220302A: Swift detection of a burst
  47. GRB 220228A: Fermi-LAT detection
  48. Konus-Wind detection of GRB 220222A
  49. IPN triangulation of GRB 220222A
  50. GCN Circ.draft on GRB 220222A
  51. GRB 220219B: Swift-XRT observations
  52. ZTF22aaajecp/AT2022cmc: Swift Observation and a UV Detection
  53. GRB 220219B: Swift ToO observations
  54. GRB 220222A: Swift/BAT-GUANO detection outside the coded FOV
  55. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  56. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  57. GRB 220218A: BOOTES-5/JGT optical upper limit
  58. GRB 220218A: Swift detection of a burst
  59. Swift GRB220218.94: Global MASTER-Net observations report
  60. Swift resumes pointed science observations
  61. Konus-Wind detection of GRB 220211A
  62. GRB 220211A: Fermi GBM observation
  63. GRB 220210A: Mondy, AbAO and Terskol optical upper limits
  64. IPN triangulation of GRB 220211A (short)
  65. GRB 220210A: Insight-HXMT/HE detection
  66. GRB 220211A: Swift/BAT-GUANO detection outside the coded FOV (short)
  67. GRB 220210A: 1.5m OSN optical upper limit
  68. GRB 220210A: Fermi GBM detection
  69. GRB 220210A: Fermi-LAT detection
  70. GRB 220210A: AGILE detection
  71. GRB 220210A: BOOTES-5/JGT optical afterglow candidate
  72. GRB 220210A: Swift/BAT-GUANO localization
  73. GRB 210919A: Maidanak optical observations
  74. GRB 210919A: SPI-ACS/INTEGRAL observation and evaluation of Ep
  75. Konus-Wind detection of GRB 220203A
  76. GRB 220203A: GECAM detection
  77. GRB 220203A: Swift/BAT-GUANO detection outside the coded FOV
  78. IPN triangulation of GRB 220203A (short)
  79. IPN triangulation of GRB 220130A
  80. Swift Reaction Wheel Anomaly Update (4 Feb 2022)
  81. GRB 211227A: Konus-Wind detection and joint Konus-Wind+Swift-BAT spectral analysis
  82. GRB 220131B: Swift/BAT-GUANO detection outside the coded FOV
  83. IPN triangulation of GRB 220128A (long)
  84. IPN triangulation of GRB 220124A
  85. GRB 220117A, GROND observations
  86. GRB 220117A: Terskol and AbAO optical upper limits
  87. GRB 220118A: TARGET optical upper limit
  88. GRB 220117B: TARGET optical upper limit
  89. GRB 220117A: Konus-Wind detection and joint Konus-Wind + Swift-BAT spectral analysis
  90. IPN triangulation of GRB 211226A
  91. GRB 220117C: Fermi GBM Observation
  92. GRB 220118A: 2.2m CAHA/CAFOS detections
  93. GRB 220118A: Fermi GBM detection
  94. GRB 220118A: COATLI Optical Observations
  95. GRB 220101A: KAO optical-R observation
  96. GRB 211221A: No V & R detection, KAO telescope
  97. GRB 220118A: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  98. GRB 220117C: Swift/BAT-GUANO arcminute localization
  99. Swift currently in safe hold with science slews disabled
  100. GRB 220118A: Swift-BAT refined analysis

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