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"

11634 results found.

  1. Konus-Wind observation of GRB 181222A
  2. GRB 181222B: Global MASTER Net observations of short bright Fermi GRB
  3. Konus-Wind observation of GRB 181222B
  4. IPN Triangulation of extremely bright short GRB 181222B
  5. GRB 181222A: CALET Gamma-Ray Burst Monitor detection
  6. GRB 181222B: Global MASTER Net observations of the short bright Fermi GRB error box.
  7. GRB 181222B : Fermi GBM detection
  8. GRB 181222A: Fermi GBM observation
  9. GRB 181217A: Insight-HXMT/HE detection
  10. GRB 181212A:Insight-HXMT/HE detection
  11. Konus-Wind observation of GRB 181212A
  12. IPN Triangulation of GRB 181212A (long)
  13. GRB 181212A: Fermi GBM Detection
  14. GRB 181126B: KAIT Follow-Up Observations of a Fermi Short GRB (Trigger 564897175)
  15. MASTER OT J063515.49-624002.9 of Fermi trigger 565936249: optical observations in SAAO
  16. MASTER: OTs detection during Fermi alert trigger 565936249 early observations
  17. GRB 181126B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 564897175)
  18. Fermi-GBM Observations During Four New GW-Detected BBH Mergers (Correction)
  19. Fermi-GBM Observations During Four New GW-Detected BBH Mergers
  20. GRB 181201A: Insight-HXMT/HE detection
  21. GRB 181201A: Fermi-LAT detection
  22. Short-duration GRB 181121.4: MASTER-Tavrida possible OT detection near the PGC galaxy during large Fermi error box inspection
  23. GRB 181126A: Fermi GBM observation
  24. GRB 181125A: Fermi GBM observation
  25. GRB 181020A: AstroSat CZTI detection
  26. GRB 181119A: Insight-HXMT/HE detection
  27. GRB 181120A: Fermi GBM observation
  28. GRB 181120A: Fermi-LAT detection
  29. Fermi GRB 181105.31: Global MASTER Net optical observations
  30. GRB 181028A: Insight-HXMT/HE detection
  31. GRB 181028A: CALET Gamma-Ray Burst Monitor detection
  32. GRB 181026A: AstroSat CZTI detection
  33. Konus-Wind observation of GRB 181028A
  34. IPN Triangulation of GRB 181028A (long)
  35. GRB 181028A: Fermi GBM observation
  36. GRB 181028A: Fermi-LAT detection
  37. GRB 181027A: Fermi GBM detection
  38. GRB 180728B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 554505003)
  39. Fermi-LAT Gamma-ray Observations of IceCube-181023A
  40. IceCube-181023A - IceCube observation of a high-energy neutrino candidate event
  41. Konus-Wind observation of GRB 181020A
  42. GRB 181020A: Swift/UVOT Detection
  43. GRB 181020A: Global MASTER Net OT observations
  44. GRB 181020A: VLT/X-shooter spectroscopy and redshift
  45. GRB 181020A: Fermi GBM detection
  46. GRB 181020A: Fermi-LAT detection
  47. GRB 181014A: Insight-HXMT/HE detection
  48. Fermi GBM Observation of IceCube-181014A
  49. Fermi-LAT Gamma-ray Observations of IceCube-181014A
  50. GRB180913A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 558557292)
  51. GRB 181010A: Fermi GBM observation
  52. IPN Triangulation of GRB 181008B (long)
  53. GRB 181008A: Insight-HXMT/HE detection
  54. INTEGRAL detections of the prompt gamma-ray emission of GRB 180914B
  55. Konus-Wind observation of GRB 180923A
  56. GRB 180923B - GBM Correction to GCN 23263
  57. GRB 180923B: Fermi GBM detection
  58. GRB 180914B: OSN Detection and light curve/SED analysis
  59. Konus-Wind observation of GRB 180914A
  60. GRB 180914B: DDOTI/OAN Detection and Confirmation of Fading
  61. GRB 180914B: AstroSat CZTI detection
  62. GRB 180914A: AstroSat CZTI detection
  63. IPN Triangulation of GRB 180914A (long)
  64. GRB 180914B: VLT/X-shooter spectroscopic redshift
  65. GRB 180914B: AGILE/MCAL refined analysis
  66. GRB180914B: Swift UVOT detection of an optical afterglow
  67. Konus-Wind of the very bright GRB 180914B
  68. GRB 180914B: RATIR Optical and NIR Observations
  69. GRB 180914B: Swift-XRT afterglow detection
  70. GRB 180914A: RATIR Optical and NIR Observations
  71. GRB 180914B: Tiled Swift observations
  72. GRB 180914B: Fermi-LAT detection
  73. GRB 180914A: MASTER automatic inspection
  74. GRB 180914A: Swift-XRT observations
  75. GRB 180914A: Tiled Swift observations
  76. GRB 180914A: Fermi GBM detection
  77. GRB 180914A: Fermi-LAT detection
  78. Fermi-LAT Gamma-ray Observations of IceCube-180908A
  79. Fermi GBM trigger 557852757/180905629 is not a GRB
  80. Konus-Wind observation of GRB 180828A
  81. GRB 180828A: AstroSat CZTI detection
  82. GRB 180828A: Fermi GBM observation
  83. Fermi GBM trigger 557014342/180826925 is not a GRB
  84. Fermi GBM trigger 557008382/180826856 is not a GRB
  85. GRB 180818B: 1.5m OSN optical afterglow candidate
  86. GRB180806A: confirmation of the X-ray afterglow
  87. GRB 180818B: Fermi GBM observations
  88. GRB 180812A: Fermi GBM detection
  89. Konus-Wind observation of GRB 180809B
  90. MASTER: OT detection during two Fermi GBM triggers (555263883 and 555263883) error boxes inspection in 22.5 mag SDSS galaxy direction
  91. GRB 180806A: AstroSat CZTI detection
  92. Konus-Wind observation of GRB 180806A
  93. GRB 180809A: Fermi GBM observation
  94. GRB 180809A: CALET Gamma-Ray Burst Monitor detection
  95. GRB 180728A: AstroSat CZTI detection
  96. GRB180806A: correction to Circular 23097
  97. GRB 180723A: AstroSat CZTI detection
  98. GRB 180806A: NOT optical observations
  99. GRB 180806A: Swift-XRT afterglow detection
  100. GRB 180806A/180806.98: RATIR Optical Observations of MASTER OT J004613.05+242014.1

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