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"

27592 results found.

  1. GRB 160303A: JCMT SCUBA-2 sub-mm observation
  2. GRB160303A: further GROND observations
  3. GRB 160303A, Swift-BAT refined analysis
  4. GRB 160303A: Continued RATIR Optical and NIR Observations
  5. GRB 160303A: GROND Optical Detection
  6. GRB 160303A: VLT/FORS2 afterglow obervations
  7. GRB 160303A: BOAO R-band Detection
  8. GRB 160303A iTelescope observation
  9. GRB 160303A: Swift-XRT refined Analysis
  10. Swift possibly triggered on IGR17091-3624
  11. GRB 160303A: Swift/UVOT Detection
  12. GRB 160303A: RAPTOR Observations During Gamma-Ray Emitting Interval
  13. GRB 160303A: RATIR Optical and NIR Afterglow Detection
  14. GRB 160303A: LCOGT-FTN optical observations
  15. GRB 160303A: ISON-NM early optical early limits
  16. GRB 160303A: Swift detection of a burst, possibly short
  17. GRB 160227A: McDonald 0.8m Detection
  18. GRB 160228A: Swift/UVOT Upper Limits
  19. GRB 160227A: Swift/UVOT Detection
  20. GRB 160228A: RATIR Optical and NIR Observations
  21. GRB 160228A: MASTER-Amur prompt observations
  22. GRB 160228A: Swift-XRT refined Analysis
  23. GRB 160227A: MASTER prompt OT Detection and LC
  24. GRB 160227A: AROMA-N Optical Observation
  25. GRB 160228A: GROND Afterglow Candidate
  26. GRB 160228A: Swift-BAT refined analysis
  27. GRB 160227B: Fermi GBM detection
  28. GRB 160228A: Swift detection of a burst
  29. GRB 160227A, Swift-BAT refined analysis
  30. GRB 160227A: Swift-XRT refined Analysis
  31. GRB 160227A: MAXI/GSC detection
  32. GRB 160227A: ISON-Kislovodsk optical observation
  33. GRB 160227A: MASTER OT Detection
  34. GRB 160227A: Swift detection of a burst with an optical counterpart
  35. GRB 160225B: Fermi GBM detection
  36. IPN Triangulation of GRB 160225B
  37. GRB 160225.81/FERMI Trigg 478121069: MASTER OT J095503.19-355149.4 follow up observations
  38. GRB 160225A: Continued RATIR Optical and NIR Observations
  39. GRB 160225.81/FERMI Trigg 478121069: MASTER OT J095503.19-355149.4 detection
  40. GRB 160225A: Swift-BAT refined analysis
  41. Fermi GBM trigger 478156376/16022621 is not a GRB
  42. GRB 160225A: MASTER-Amur observations
  43. GRB 160225A: RATIR Optical and NIR Observations
  44. GRB 160225A: Swift/UVOT Upper Limits
  45. GRB 160225A: Swift-XRT refined Analysis
  46. GRB 160223A: RATIR Optical and NIR Observations
  47. GRB 160225A: MASTER-Amur early observations
  48. GRB 160225A: Swift detection of a burst
  49. GRB 160223A: Swift-XRT afterglow detection
  50. Swift trigger 675784 is probably not an astrophysical source
  51. Konus-Wind observation of GRB 160219A
  52. GRB 160223B: MASTER-Amur early observations
  53. Fermi GBM trigger 477460274/160218161 is not a GRB
  54. Fermi GBM trigger 477985003/160224234 is not a GRB
  55. GRB 160223A: Swift-BAT refined analysis
  56. GRB 160223A: Fermi GBM observation
  57. GRB 160223B: LCOGT-FTN optical observations
  58. GRB 160223B: Fermi GBM observation
  59. GRB 160223A: GROND optical/NIR afterglow
  60. GRB 160223A: Swift detection of a burst
  61. GRB 160221A: Fermi GBM observation
  62. GRB 160221A: GROND upper limits
  63. GRB 160220B: Further GROND Observations
  64. GRB 160221A: MASTER-SAAO early observations
  65. Konus-Wind observation of GRB 160220B
  66. Swift trigger 674752 is likely due to a noise fluctuation
  67. GRB 160220B: Swift-BAT refined analysis
  68. GRB 160220B: GROND Observations
  69. GRB 160219A: Fermi GBM detection
  70. GRB 160220A: nIR observations at AAT
  71. GRB 160220A: Swift-XRT refined Analysis
  72. GRB 160220A: Swift-BAT refined analysis
  73. GRB160220B: Swift/UVOT observations
  74. GRB 160220B: Swift-XRT refined Analysis
  75. IPN Triangulation of GRB 160219A (short/hard)
  76. GRB160220A: Swift/UVOT observations
  77. Swift Trigger 674752 is likely a noise fluctuation in the direction of IGR17488-3253
  78. GRB 160220A: TAROT Calern and TAROT La Silla observatory optical observations
  79. GRB 160220B: Swift detection of a burst
  80. GRB 160220A: MASTER-Amur observations
  81. GRB 160220A: GROND Optical/NIR Upper Limits
  82. GRB 160220A: Fermi GBM observation
  83. GRB 160220A: Swift-XRT observations
  84. GRB 160220A: Swift detection of a burst
  85. LIGO/Virgo G184098: MASTER arhival results
  86. GRB 160216A: Swift-BAT refined analysis
  87. Konus-Wind observation of GRB 160216A (and GRB 160216B)
  88. GRB 160216A: Swift-XRT refined Analysis
  89. GRB 160216A: Swift/UVOT Upper Limits
  90. GRB 160216A: Swift detection of a burst
  91. LIGO/Virgo G184098: MAXI/GSC search for an X-ray counterpart of GW150914
  92. Fermi GBM trigger 477254668/160215781 is not a GRB
  93. GRB 160206A: Kiso/KWFC optical observations
  94. GRB 160203A: RATIR Upper Limits
  95. GRB 160206B: Fermi GBM detection
  96. LIGO/Virgo G211117: LOFAR follow-up
  97. Swift Trigger 672897 is probably not an astrophysical event
  98. GRB 151215A: TAROT Calern observatory very early optical detection
  99. GRB 160206A: Swift/UVOT observations
  100. GRB 160203A: Zadko observatory - Gingin 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