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"

26726 results found.

  1. GRB 130502B: Fermi GBM detection of a burst
  2. GRB 130502A: T100 Observations
  3. GRB 130502A: Swift detection of a burst
  4. GRB 130425A: Suzaku WAM observation of the prompt emission
  5. GRB 130427A: Nishi-Harima Optical Spectroscopic Observations
  6. GRB 130427A: high energy gamma-ray detection by AGILE
  7. GRB 130427A: Continued RATIR Optical and NIR Observations
  8. GRB 130427A: MITSuME Ishigakijima Optical Observation after 2 days
  9. GRB 130427A: Challis Observatory optical observations
  10. GRB 130427A: Continued Skynet/PROMPT Observations
  11. GRB 130427A: Fermi-LAT refined analysis
  12. GRB 130427A: SARA-N detection
  13. GRB 130427A: Continued RATIR Optical and NIR Observations
  14. GRB 130427A: CrAO RT-22 36 GHz observation
  15. GRB 130418A: Bassano Bresciano Observatory lightcurve analisis
  16. GRB 130427A: Improved Swift-XRT analysis
  17. GRB 130425: MASTER-Net optical observations
  18. GRB 100728A: GROND host detection and X-shooter redshift
  19. GRB 130427B: MITSuME Ishigakijima upper limits
  20. GRB 130427A: MITSuME Okayama and Ishigakijima Optical Observation after 1 day
  21. GRB 130427A: Skynet/PROMPT Observations
  22. GRB 130427B: RATIR Optical and NIR Observations
  23. GRB 130427A: Nishi-Harima NIR Observations
  24. GRB 130427A : Xinglong TNT optical observation
  25. GRB 130427A optical time series
  26. GRB 130427A, Optical Observations
  27. GRB 130427A: Swift-XRT refined Analysis
  28. GRB 130427A: Continued RATIR Optical and NIR Observations
  29. GRB 130427A: CARMA 85 GHz detection
  30. GRB 130427B: Swift-XRT refined Analysis
  31. GRB 130427A: NOT optical photometry and redshift
  32. GRB 130427B: MITSuME Okayama upper limits
  33. GRB 130427A: RAPTOR Bright Counterpart Before Swift Trigger
  34. GRB 130427A: T100 observations
  35. GRB 130427A: optical observations in CrAO
  36. GRB 130427A: Fermi GBM observation
  37. GRB 130427A: Fermi-LAT detection of a burst
  38. GRB 130427B: Swift-BAT refined analysis
  39. GRB 130427A: Zadko observatory - Gingin optical observations
  40. GRB 130427B: Enhanced Swift-XRT position
  41. GRB 130427A: GMG optical observation
  42. GRB 130427A: MITSuME Okayama Optical Observation
  43. GRB 130427A: MAXI/GSC detection
  44. GRB 130427B: Faulkes Telescope North afterglow detection
  45. GRB 130427B: Swift detection of a burst with optical counterpart
  46. GRB 130427A: RATIR Optical and NIR Observations
  47. GRB 130427A: Weihai optical observations
  48. GRB 130427A: Continued P60 follow-up of an extremely bright optical afterglow
  49. GRB 130427A: PAIRITEL NIR Detections
  50. GRB 130427A: Faulkes Telescope North detection
  51. GRB 130427A: early optical observations
  52. GRB 130427A: Swift detection of a very bright burst with a likely bright optical counterpart
  53. GRB 130420A: Continued Skynet/GORT Observations/Detections
  54. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  55. GRB 130425A: Fermi GBM detection
  56. GRB 130420A: Continued RATIR Optical and NIR Observations
  57. GRB 130420A: Continued RATIR Optical and NIR Observations
  58. GRB 130418A: Continued RATIR Optical and NIR Observations
  59. GRB 130420B: Fermi GBM observation
  60. Swift Trigger 554135 is probably not a GRB or transient
  61. GRB 130420B: RATIR Optical and NIR Observations
  62. GRB 130420A: Continued RATIR Optical and NIR Observations
  63. GRB 130420B: Swift-XRT refined Analysis
  64. GRB 130420A: Fermi GBM observation
  65. GRB 130420A: ISON-NM optical observations
  66. Skynet/GORT observations of GRB130420A
  67. GRB 130420B: Weihai optical upper limit
  68. GRB 130420B: Swift/UVOT Upper Limits
  69. GRB 130420A: Swift/UVOT Detection
  70. GRB130420B: GMG optical upper limit
  71. GRB 130420A: Swift-XRT refined Analysis
  72. GRB 130420B: Enhanced Swift-XRT position
  73. GRB 130420A: GMG optical observation
  74. GRB 130420A: Enhanced Swift-XRT position
  75. GRB130420A : Xinglong TNT optical upper limit
  76. GRB 130420B: Faulkes Telescope North observations
  77. GRB 130420A: Weihai Optical Observations
  78. GRB 130420B: Swift detection of a burst
  79. GRB 130420A: RATIR Optical and NIR Observations
  80. GRB 130420A: PAIRITEL NIR detections
  81. GRB 130420A: Swift detection of a burst with an optical counterpart
  82. GRB 130420A: Faulkes Telescope North candidate
  83. GRB 130418A: Continued RATIR Optical and NIR Observations
  84. GRB 130418A: Swift-XRT refined Analysis
  85. GRB 130418A: SMARTS optical/IR afterglow observations
  86. GRB 130418A: Submm observations from SMA
  87. GRB 130419A, Swift-BAT refined analysis
  88. GRB 130327B: Swift/XRT source is not the afterglow
  89. Trigger 553930: Swift detection of a possible flare from HR 5110
  90. GRB 130418A: LOAO Observation
  91. GRB 130418A, Swift-BAT refined analysis
  92. GRB 130418A: REM NIR observations
  93. GRB 130418A: RATIR Optical and NIR Observations
  94. GRB 130418A: GROND detection of the optical-NIR afterglow
  95. GRB130418A: OSN 1.5m fading afterglow detection
  96. GRB 130418A: Swift/UVOT Detection and request for continuing coverage
  97. GRB 130418A: Enhanced Swift-XRT position
  98. GRB 130418A: TAROT Calern and TAROT la Silla observatory optical observations
  99. GRB 130418A: TNG optical observations
  100. GRB 130418A: Bassano Bresciano Observatory optical observations

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