Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

37770 results found.

  1. GRB 190114B: Enhanced Swift-XRT position
  2. GRB 190114C: MASTER afterglow Detection
  3. INTEGRAL observation of IceCube-190104A
  4. GRB 190114C: Swift detection of a very bright burst with a bright optical counterpart
  5. GRB 190114A: OSN Detection
  6. GRB 190114B: Swift detection of a burst
  7. GRB 190114A: Swift-BAT refined analysis
  8. GRB 190103B: Swift/UVOT Upper Limits
  9. GRB 190114A: Swift-XRT refined Analysis
  10. GRB 190114A: GROND detection of the afterglow
  11. GRB 190114A: Enhanced Swift-XRT position
  12. GRB 190114A: VLT/X-shooter redshift
  13. GRB 190114A: Prompt enhanced Swift-XRT position
  14. GRB 190114A: Possible UVOT Detection
  15. GRB 190114A: Swift detection of a burst
  16. GRB 190110A：Insight-HXMT/HE detection
  17. Konus-Wind observation of GRB 190110A
  18. GRB 190110A, Swift-BAT refined analysis
  19. Correction to GCN Circular 23663: GRB 190109A: Swift UVOT Upper Limits
  20. Konus-Wind observation of GRB 190103A
  21. GRB 190110A: Fermi GBM detection
  22. GRB 190110A: Swift detection of a burst
  23. GRB 181228A: FRAM-ORM optical limit
  24. GRB 190106A: GMG continued observation
  25. GRB 190109B: Fermi GBM observation
  26. GRB 190106A: OSN Afterglow Observations
  27. GRB 190109B: Swift/UVOT Upper Limits
  28. GRB 190109A: Swift/UVOT Upper Limits
  29. GRB 190109B: Swift-XRT refined Analysis
  30. GRB 190106A: optical observations, possible jet break detection
  31. GRB 190106A: Liverpool Telescope observations
  32. GRB 190109B: Swift-BAT refined analysis
  33. GRB 190109A: Fermi GBM observation
  34. Correction to the GCN circ. 23654 / GRB 190109B: Mondy optical upper limit
  35. GRB 190109B: COATLI Optical Observations
  36. GRB 190109B: BOOTES-5/JGT optical observations
  37. GRB 190109B: Mondy optical upper limit
  38. GRB 190109A: Swift-BAT refined analysis
  39. GRB 190109B: Enhanced Swift-XRT position
  40. GRB 190109B: Swift-XRT observations
  41. GRB190109A: MITSuME Akeno optical upper limits
  42. GRB 190109B: Swift detection of a burst
  43. IPN triangulation of GRB 190103A (long)
  44. GRB 190109A: Swift-XRT refined Analysis
  45. GRB 190109A: Enhanced Swift-XRT position
  46. GRB 190109A: Prompt enhanced Swift-XRT position
  47. GRB 190109A: Swift detection of a burst
  48. GRB 190106A: Mondy optical observations
  49. GRB 190106A : continued TSHAO optical observations
  50. Konus-Wind observation of GRB 190106A
  51. GRB 190106A: NEXT-0.6m and Xinglong-2.16m photometric single powerlaw decay
  52. IERCOO/ICSP optical observation of GRB 190106A
  53. GRB 190106A: GMG photometry in the 2nd night
  54. GRB 190106A: Swift-XRT refined Analysis
  55. GRB 190106A: VLT/X-shooter redshift confirmation
  56. GRB 190103B: CALET Gamma-Ray Burst Monitor detection
  57. GRB 190106A: GMG spectral results
  58. GRB 190106A: update of the Xinglong-2.16m spectroscopy
  59. GRB 190106A: OASDG optical observations
  60. GRB 190106A: BOOTES-4/MET optical observations
  61. GRB 190106A: Swift/UVOT Detection
  62. GRB 190106A: Swift-BAT refined analysis
  63. GRB 190106A: Bassano Bresciano Observatory optical detection
  64. GRB 190106A: Xinglong-2.16m spectroscopy
  65. GRB 190106A: GWAC-F60B optical detection
  66. Fermi GBM Observations of IceCube-190104A
  67. GRB 190106A : TSHAO optical observations
  68. GRB 190106A: Enhanced Swift-XRT position
  69. GRB 190106A: GMG detection
  70. GRB 190106A: MITSuME Akeno optical observation
  71. GRB 190106A: MASTER Amur OT detection
  72. GRB 190106A: Swift detection of a burst with an optical counterpart
  73. Konus-Wind observation of GRB 190103B
  74. GRB 190103A: AstroSat CZTI detection
  75. Fermi LAT Gamma-ray Observations of IceCube-190104A
  76. GRB 190103B: Bassano Bresciano observatory upper limit
  77. GRB 190103B: Swift-BAT refined analysis
  78. GRB 190103B: Swift-XRT refined Analysis
  79. GRB 190103B: Enhanced Swift-XRT position
  80. GRB 190103B: Swift detection of a burst
  81. GRB 181201A: photometric signature of the SN
  82. GRB 190103A: AGILE/MCAL detection of a burst
  83. GRB 181231A: BOOTES-2/TELMA optical observations
  84. GRB 181231A: Fermi GBM detection
  85. GRB 181231A: Fermi-LAT detection
  86. GRB 181228A: Mondy and AbAO optical upper limits
  87. GRB 181225A: further Swift-XRT observations
  88. GRB 181228A: Global MASTER Net OT is the same REM IR transient
  89. GRB 181228A: possible NOT optical detection
  90. Fermi GBM trigger 567868083/181230547 is not a GRB
  91. GRB 181227A: CALET Gamma-Ray Burst Monitor detection
  92. GRB 181228A: MITSuME Akeno optical upper limits
  93. Konus-Wind observation of GRB 181227A
  94. GRB 181228A: Xinglong-2.16m optical upper limit
  95. GRB 181227A: Global MASTER Net oprtical inspection
  96. Swift Trigger 880127 is not a GRB
  97. GRB 181228A: Swift-XRT refined Analysis
  98. GRB 181228A: Swift-BAT refined analysis
  99. GRB 181222B: Swift follow-up observations of MASTER optical transient J204928.79+245744.0
  100. GRB 181228A: Swift/UVOT Upper Limits

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