Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

12091 results found.

  1. GRB 221009A: Analysis of the initial episode using data of GBM/Fermi and SPI-ACS/INTEGRAL
  2. GRB 221009A: optical observations, SN photometric evidence
  3. GRB 221021A: Swift/BAT-GUANO detection outside the coded FOV
  4. GRB 221020A: Detection by GRBAlpha
  5. SGR 1935+21542: VZLUSAT-2 and GRBAlpha joint detection
  6. GRB 221017A: Swift-XRT observations
  7. GRB 221020A: Fermi GBM Final Real-time Localization
  8. Improved IPN localization for GRB 221009A (BepiColombo-MGNS light curve)
  9. GRB 221009A X-ray light-curve and the indication of TeV light-curve
  10. AGILE detection of a burst from SGR J1935+2154 reported by VZLUSAT-2
  11. GRB 221013B: Swift/BAT-GUANO detection
  12. SGR 1935+2154: Bursting activity detected by VZLUSAT-2
  13. AGILE detection of the 2022 October 17 burst from SGR J1935+2154 reported by Konus-Wind
  14. GRB 221009A: GRANDMA observations
  15. SGR 1935+2154: Detection by GRBAlpha
  16. The probability of observing GRB 221009A at z = 0.151
  17. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 October 17
  18. GRB 221009A: Medicina Radio Telescope observations
  19. AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
  20. GRB 221016A: Swift-XRT refined Analysis
  21. Konus-Wind detection of GRB 221016A
  22. GRB 221017A: MAXI/GSC detection
  23. GRB 221016A: Swift detection of a burst
  24. Swift GRB221016.99: Global MASTER-Net observations report
  25. Konus-Wind detection of a short burst coincident with a bright radio burst from SGR 1935+2154
  26. GRB 221009A: continued Assy optical afterglow observations, possible SN evidence
  27. Konus-Wind observation of the recent SGR 1935+2154 activity
  28. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  29. GRB 221009A: Fermi LAT data rate effects due to extremely high flux
  30. MAXI/GSC refined analysis of the bright X-ray afterglow of GRB 221009A/Swift J1913.1+1946
  31. GRB 221009A: OHP optical observations
  32. GRB 221009A: Gamma-ray Detection by SIRI-2
  33. GRB221009A: RTT-150 optical observations
  34. MAXI GRB 221006A: Redshifts of the possible host galaxies
  35. Fermi Gamma-ray Burst Monitor continues to detect SGR 1935+2154
  36. Fermi trigger No 687345829: Global MASTER-Net observations report
  37. Fermi trigger No 687344475: Global MASTER-Net observations report
  38. Fermi trigger No 687340841: Global MASTER-Net observations report
  39. Fermi trigger No 687337536: Global MASTER-Net observations report
  40. Fermi trigger No 687281393: Global MASTER-Net observations report
  41. GRB 221013A: Fermi GBM Final Real-time Localization
  42. Integral GRB221012.91: Global MASTER-Net observations report
  43. Integral GRB221012.88: Global MASTER-Net observations report
  44. Integral GRB221012.87: Global MASTER-Net observations report
  45. Integral GRB221012.77: Global MASTER-Net observations report
  46. Integral GRB221012.74: Global MASTER-Net observations report
  47. Integral GRB221012.72: Global MASTER-Net observations report
  48. Integral GRB221012.71: Global MASTER-Net observations report
  49. Integral GRB221012.68: Global MASTER-Net observations report
  50. Integral GRB221012.68: Global MASTER-Net observations report
  51. Afterglow limits of GRB 221006A from OHP
  52. GRB221009A: optical afterglow measurements from Konkoly Observatory
  53. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  54. INTEGRAL shows increasing activity in SGR J1935+2154
  55. Integral GRB221012.63: Global MASTER-Net observations report
  56. Integral GRB221012.61: Global MASTER-Net observations report
  57. Integral GRB221012.60: Global MASTER-Net observations report
  58. Integral GRB221012.53: Global MASTER-Net observations report
  59. Fermi trigger No 687205006: Global MASTER-Net observations report
  60. INTEGRAL detection of a burst from SGR J1935+2154
  61. GRB 221009A: NuSTAR Detection
  62. GRB221009A: INTEGRAL detection of Hard X-ray emission up to 38 hours after trigger
  63. GRB 221009A: Detection by GRBAlpha
  64. INTEGRAL detection of a burst from SGR J1935+2154
  65. Integral GRB221010.89: Global MASTER-Net observations report
  66. GRB 221009A/Swift J1913.1+1946: Assy optical afterglow observation
  67. Konus-Wind detection of GRB 221009A
  68. GRB 221009A (Swift J1913.1+1946): Burke-Gaffney Observatory optical observations
  69. ​GRB 221009A: Multi-color detection of the optical
  70. GRB 221009A: Fermi-LAT refined analysis
  71. GRB 221009: Swift/UVOT Detection
  72. Swift J1913.1+1946: Optical photometry
  73. Fermi trigger No 687014224: Global MASTER-Net observations report
  74. Swift J1913.1+1946: Liverpool Telescope imaging and spectroscopy
  75. GRB 221009A or Swift J1913.1+1946: Fermi-LAT detection
  76. GRB 221008A: MAXI/GSC detection
  77. GRB 221006A: MAXI/GSC detection
  78. Fermi GBM trigger 686435254/221002852 is not a GRB
  79. Fermi GBM trigger 686350260/221001869 is not a GRB
  80. Fermi trigger No 686403226: Global MASTER-Net observations report
  81. Fermi trigger No 686350260: Global MASTER-Net observations report
  82. Konus-Wind detection of GRB 220930A
  83. GRB 220930A: AstroSat CZTI detection
  84. GRB 220930A: Enhanced Swift-XRT position
  85. GRB 220930A: Prompt enhanced Swift-XRT position
  86. GRB 220930A: Swift detection of a burst
  87. Fermi-LAT gamma-ray observations of IceCube-220928A
  88. Konus-Wind detection of GRB 220927A
  89. IPN triangulation of GRB 220927A (long)
  90. Ultra-long GRB 220525B: Konus-Wind and Fermi-GBM detection
  91. Analysis of long GRB 220926B detected by INTEGRAL
  92. GRB 220926B
  93. Fermi GRB 220925A: Global MASTER-Net observations report
  94. GRB 220924A: Swift/BAT-GUANO detection outside the coded FOV
  95. Fermi trigger No 685748699: Global MASTER-Net observations report
  96. Konus-Wind detection of GRB 220921A
  97. GRB 220921A: Fermi-LAT detection
  98. Fermi trigger No 685452089: Global MASTER-Net observations report
  99. Fermi-LAT gamma-ray observations of IceCube-220918A and detection of a new gamma-ray source, Fermi J0502.5+0037
  100. IceCube-220907A: No significant detection in HAWC

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