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"

11785 results found.

  1. GRB 221023A: AGILE detection of a burst
  2. GRB 221022A: Swift/BAT-GUANO detection
  3. GRB 221022B: Swift/BAT-GUANO detection outside the coded FOV
  4. GRB 221009A: Analysis of the initial episode using data of GBM/Fermi and SPI-ACS/INTEGRAL
  5. GRB 221009A: optical observations, SN photometric evidence
  6. GRB 221021A: Swift/BAT-GUANO detection outside the coded FOV
  7. GRB 221020A: Detection by GRBAlpha
  8. GRB 221017A: Swift-XRT observations
  9. GRB 221020A: Fermi GBM Final Real-time Localization
  10. Improved IPN localization for GRB 221009A (BepiColombo-MGNS light curve)
  11. GRB 221009A X-ray light-curve and the indication of TeV light-curve
  12. GRB 221013B: Swift/BAT-GUANO detection
  13. GRB 221009A: GRANDMA observations
  14. The probability of observing GRB 221009A at z = 0.151
  15. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 October 17
  16. GRB 221009A: Medicina Radio Telescope observations
  17. AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
  18. GRB 221016A: Swift-XRT refined Analysis
  19. Konus-Wind detection of GRB 221016A
  20. GRB 221017A: MAXI/GSC detection
  21. GRB 221016A: Swift detection of a burst
  22. Swift GRB221016.99: Global MASTER-Net observations report
  23. Konus-Wind detection of a short burst coincident with a bright radio burst from SGR 1935+2154
  24. GRB 221009A: continued Assy optical afterglow observations, possible SN evidence
  25. Konus-Wind observation of the recent SGR 1935+2154 activity
  26. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  27. GRB 221009A: Fermi LAT data rate effects due to extremely high flux
  28. MAXI/GSC refined analysis of the bright X-ray afterglow of GRB 221009A/Swift J1913.1+1946
  29. GRB 221009A: OHP optical observations
  30. GRB 221009A: Gamma-ray Detection by SIRI-2
  31. GRB221009A: RTT-150 optical observations
  32. MAXI GRB 221006A: Redshifts of the possible host galaxies
  33. Fermi Gamma-ray Burst Monitor continues to detect SGR 1935+2154
  34. Fermi trigger No 687345829: Global MASTER-Net observations report
  35. Fermi trigger No 687344475: Global MASTER-Net observations report
  36. Fermi trigger No 687340841: Global MASTER-Net observations report
  37. Fermi trigger No 687337536: Global MASTER-Net observations report
  38. Fermi trigger No 687281393: Global MASTER-Net observations report
  39. GRB 221013A: Fermi GBM Final Real-time Localization
  40. Integral GRB221012.91: Global MASTER-Net observations report
  41. Integral GRB221012.88: Global MASTER-Net observations report
  42. Integral GRB221012.87: Global MASTER-Net observations report
  43. Integral GRB221012.77: Global MASTER-Net observations report
  44. Integral GRB221012.74: Global MASTER-Net observations report
  45. Integral GRB221012.72: Global MASTER-Net observations report
  46. Integral GRB221012.71: Global MASTER-Net observations report
  47. Integral GRB221012.68: Global MASTER-Net observations report
  48. Integral GRB221012.68: Global MASTER-Net observations report
  49. Afterglow limits of GRB 221006A from OHP
  50. GRB221009A: optical afterglow measurements from Konkoly Observatory
  51. Integral GRB221012.63: Global MASTER-Net observations report
  52. Integral GRB221012.61: Global MASTER-Net observations report
  53. Integral GRB221012.60: Global MASTER-Net observations report
  54. Integral GRB221012.53: Global MASTER-Net observations report
  55. Fermi trigger No 687205006: Global MASTER-Net observations report
  56. INTEGRAL detection of a burst from SGR J1935+2154
  57. GRB 221009A: NuSTAR Detection
  58. GRB221009A: INTEGRAL detection of Hard X-ray emission up to 38 hours after trigger
  59. GRB 221009A: Detection by GRBAlpha
  60. INTEGRAL detection of a burst from SGR J1935+2154
  61. Integral GRB221010.89: Global MASTER-Net observations report
  62. GRB 221009A/Swift J1913.1+1946: Assy optical afterglow observation
  63. Konus-Wind detection of GRB 221009A
  64. GRB 221009A (Swift J1913.1+1946): Burke-Gaffney Observatory optical observations
  65. ​GRB 221009A: Multi-color detection of the optical
  66. GRB 221009A: Fermi-LAT refined analysis
  67. GRB 221009: Swift/UVOT Detection
  68. Swift J1913.1+1946: Optical photometry
  69. Fermi trigger No 687014224: Global MASTER-Net observations report
  70. Swift J1913.1+1946: Liverpool Telescope imaging and spectroscopy
  71. GRB 221009A or Swift J1913.1+1946: Fermi-LAT detection
  72. GRB 221008A: MAXI/GSC detection
  73. GRB 221006A: MAXI/GSC detection
  74. Fermi GBM trigger 686435254/221002852 is not a GRB
  75. Fermi GBM trigger 686350260/221001869 is not a GRB
  76. Fermi trigger No 686403226: Global MASTER-Net observations report
  77. Fermi trigger No 686350260: Global MASTER-Net observations report
  78. Konus-Wind detection of GRB 220930A
  79. GRB 220930A: AstroSat CZTI detection
  80. GRB 220930A: Enhanced Swift-XRT position
  81. GRB 220930A: Prompt enhanced Swift-XRT position
  82. GRB 220930A: Swift detection of a burst
  83. Fermi-LAT gamma-ray observations of IceCube-220928A
  84. Konus-Wind detection of GRB 220927A
  85. IPN triangulation of GRB 220927A (long)
  86. Ultra-long GRB 220525B: Konus-Wind and Fermi-GBM detection
  87. Analysis of long GRB 220926B detected by INTEGRAL
  88. GRB 220926B
  89. Fermi GRB 220925A: Global MASTER-Net observations report
  90. GRB 220924A: Swift/BAT-GUANO detection outside the coded FOV
  91. Fermi trigger No 685748699: Global MASTER-Net observations report
  92. Konus-Wind detection of GRB 220921A
  93. GRB 220921A: Fermi-LAT detection
  94. Fermi trigger No 685452089: Global MASTER-Net observations report
  95. Fermi-LAT gamma-ray observations of IceCube-220918A and detection of a new gamma-ray source, Fermi J0502.5+0037
  96. IceCube-220907A: No significant detection in HAWC
  97. Konus-Wind detection of GRB 220910A
  98. Fermi GRB 220912A: Global MASTER-Net observations report
  99. GRB 220912A: AstroSat CZTI detection
  100. GRB 220909A: Swift/BAT-GUANO candidate arcminute localization

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