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"

14854 results found.

  1. Konus-Wind observation of GRB 141202A
  2. GRB 141202A: Fermi GBM Detection
  3. GRB 141130A: Swift/UVOT Detection
  4. GRB 141121A: VLA radio detection
  5. GRB 141130A: Swift detection of a burst with an optical counterpart
  6. GRB 141121A: SPI-ACS/INTEGRAL observations
  7. Konus-Wind observation of GRB 141121A
  8. GRB 141121A: WSRT radio detection
  9. GRB 141121A: AMI 15 GHz detection
  10. GRB141124A: MASTER Detection of New Flare of QSO NVSS J075043+790917 During the Fermi Error Box inspection
  11. GRB 141118A: Fermi GBM Detection
  12. GRB 141121A: MAXI/GSC detection
  13. GRB141121A: BOOTES-2/TELMA upper limit
  14. GRB 141121A: Swift detection of a burst
  15. GRB 141104A: further Swift-XRT observations and afterglow candidate
  16. GRB 141109A: VLA detection
  17. Trigger 618634: Swift detection of Vela X-1
  18. Swift Trigger 618402: probable noise event
  19. GRB 141109A: Swift/UVOT Detection
  20. GRB 141109B: IRAM 30m millimetre observations
  21. GRB 141109B: BOOTES-4 and TERSKOL optical upper limit
  22. GRB 141109A: CQUEAN Detection at 0.85 - 1.05 micron
  23. GRB 141109A: REM NIR candidate afterglow
  24. GRB 141109B: Swift detection of a burst
  25. GRB 141109A: Swift detection of a burst
  26. Konus-Wind observation of GRB 141102A
  27. GRB 141102A: Fermi-LAT detection
  28. GRB 141102A: Fermi GBM detection
  29. GRB 141026A: VLA observations
  30. MAXI GRB 141029A is likely an X-ray flare from 1RXS J043657.1-161258
  31. GRB 141031A: Fermi GBM detection
  32. GRB 141031B: Swift detection of a burst
  33. GRB 141031A: GROND detection of a possible optical afterglow candidate
  34. GRB 141031A: Swift detection of a burst
  35. GRB 140509A: GROND afterglow detection
  36. GRB 141029B: Fermi GBM detection
  37. GRB 141028A: LCOGTN observations
  38. GRB 141029A: MAXI/GSC detection
  39. GRB 141028A: Swift/UVOT Detection
  40. GRB 141028A: Swift/XRT detection of the X-ray afterglow
  41. GRB 141028A: GROND Afterglow confirmation (MASTER source)
  42. GRB 141026A: IRAM 30m millimetre observations
  43. GRB 141028A: MASTER OT candidate detection
  44. GRB 141028A: Fermi GBM detection
  45. GRB 141028A: Fermi-LAT detection
  46. GRB 141026A: Continued RATIR Optical and NIR Observations, Afterglow Detection
  47. GRB 141026A: P60 early observations
  48. GRB 141026A: Swift detection of a burst
  49. GRB141022A: Fermi GBM Detection
  50. GRB141022B: Fermi GBM Detection
  51. GRB 141022A: GROND Detection of a possible Optical Afterglow Candidate
  52. GRB 141022A: Swift detection of a burst
  53. GRB 141004A: RATIR Late Time Optical and NIR Observations
  54. GRB 141020A: Swift/UVOT Detection
  55. GRB 141020B: MAXI/GSC detection
  56. GRB 141020A: Swift detection of a burst with an optical counterpart
  57. GRB 141017A: GROND Afterglow Confirmation
  58. GRB 141017A: Swift/UVOT Detection
  59. GRB 141017A: Swift detection of a burst
  60. GRB 141015A: Swift detection of a burst
  61. Konus-Wind observation of GRB 141011A
  62. GRB 141011A: Fermi GBM detection
  63. Trigger 614903: Swift detection of IGR J17544-2619
  64. GRB141004A: Host galaxy redshift form GTC
  65. Konus-Wind observation of GRB 141005A
  66. GRB 141004A: Swift/UVOT Detection
  67. GRB 141005A: Fermi GBM Detection
  68. GRB 141005A: Swift detection of a burst
  69. GRB 141004A: TNG photometric and spectroscopic observations
  70. GRB 141004A: Swift detection of a burst with an optical counterpart
  71. Swift observations of HD 305560
  72. GRB 140930B: MASTER early possible OT detection
  73. Swift possible detection of the Be star HD 305560
  74. Konus-Wind observation of GRB 140930B
  75. GRB 140928A: MAXI-GSC detection
  76. GRB 140930B: WHT detection of candidate afterglow
  77. GRB 140930B: Swift detection of a short burst
  78. GRB 140930A/MAXI J2259+524: MAXI-GSC detection
  79. Konus-Wind observation of GRB 140928A
  80. GRB 140928A: Fermi GBM detection
  81. GRB 140928A: Fermi-LAT detection
  82. GRB 140927A: Swift detection of a burst
  83. GRB 140919A: Swift/UVOT Detection
  84. GRB 140919A: Swift detection of a burst
  85. GRB 140916B: LOT and iPTF follow-up of optical afterglow candidates
  86. Swift detection of outburst from 4U 1700+24
  87. GRB 140916A: Swift detection of a burst
  88. Possible radio detection of GRB 140903A with the GMRT
  89. GRB 140903A: Chandra detection of the afterglow
  90. GRB 140909A: Swift detection of a GRB
  91. GRB 140907A: Fermi GBM Detection
  92. GRB140907A: Swift UVOT detection
  93. GRB 140906B: Fermi GBM Detection of a Long GRB
  94. GRB 140907A: Swift detection of a burst with an optical counterpart
  95. GRB 140906A - Fermi GBM Detection
  96. GRB 140903A: Confirmation of Optical Fading from Discovery Channel Telescope
  97. GRB 140903A: Possible optical variability
  98. GRB 140903A: 6 GHz VLA detection
  99. GRB 140901B: Fermi GBM detection
  100. GRB140903A: Discovery Channel Telescope Optical Detection

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