Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

19089 results found.

  1. GRB 160314A: Weihai optical upper limit
  2. GRB 160314A: Swift detection of a burst
  3. GRB 160313A: Chante-Perdrix Observatory optical observations
  4. GRB 160313A: Swift-XRT refined Analysis
  5. GRB 160313A: TAROT Calern observatory optical observations
  6. GRB 160313A: Enhanced Swift-XRT position
  7. GRB 160313A: RATIR Optical and NIR Observations
  8. GRB 160313A: SAO RAS observations
  9. GRB 160313A: Swift detection of a burst
  10. GRB 160310A: Further NOT observations
  11. GRB 160310A: Swift/UVOT Upper Limits
  12. GRB 160310A: RATIR Optical and NIR Observations
  13. GRB 160310A: NOT optical observations
  14. GRB 160310A: LCOGT-SAAO optical upper limits
  15. GRB 160303A: GTC imaging of possible host galaxy
  16. GRB 160310A: Swift ToO observations
  17. GRB 160310A: Fermi-LAT detection
  18. LIGO/Virgo G211117: HAWC follow-up of northern sky
  19. Swift trigger 677890 is noise
  20. GRB 160303A: Continued optical monitoring from NOT
  21. GRB160303A: further GROND observations
  22. GRB 160303A: 9.8 GHz VLA upper limit
  23. GRB 160303A, Swift-BAT refined analysis
  24. GRB 160303A: Continued RATIR Optical and NIR Observations
  25. GRB 160303A: GROND Optical Detection
  26. GRB 160303A: Observations from T150 OSN
  27. GRB 160303A: VLT/FORS2 afterglow obervations
  28. GRB 160303A: BOAO R-band Detection
  29. GRB 160303A: McDonald 2.1m CQUEAN Detection
  30. GRB 160303A iTelescope observation
  31. GRB 160303A: Optical observations from the NOT
  32. Swift possibly triggered on IGR17091-3624
  33. GRB 160303A: Swift/UVOT Detection
  34. GRB 160303A: RAPTOR Observations During Gamma-Ray Emitting Interval
  35. GRB 160303A: Enhanced Swift-XRT position
  36. GRB 160303A: RATIR Optical and NIR Afterglow Detection
  37. GRB 160303A: MITSuME Okayama upper limits
  38. GRB 160303A: ISON-NM early optical early limits
  39. GRB 160303A: Swift detection of a burst, possibly short
  40. GRB 160227A: LOAO 1.0m optical detection
  41. GRB 160227A: McDonald 0.8m Detection
  42. GRB 160228A: Swift/UVOT Upper Limits
  43. GRB 160227A: Swift/UVOT Detection
  44. GRB 160228A: Mondy optcial observations
  45. GRB 160228A: RATIR Optical and NIR Observations
  46. GRB 160228A: Swift-XRT refined Analysis
  47. GRB 160227A: MASTER prompt OT Detection and LC
  48. GRB 160227A: AROMA-N Optical Observation
  49. GRB 160228A: GROND Afterglow Candidate
  50. GRB 160228A: optical observations
  51. GRB 160227B: Fermi GBM detection
  52. GRB 160228A: Enhanced Swift-XRT position
  53. GRB 160227A: NOT redshift
  54. GRB 160228A: Swift detection of a burst
  55. GRB 160227A: Enhanced Swift-XRT position
  56. GRB 160227A: ISON-Kislovodsk optical observation
  57. GRB 160227A: Mt. Terskol observatory optical observation
  58. GRB 160227A: Swift detection of a burst with an optical counterpart
  59. GRB 160225A: LOAO optical upper limit
  60. IPN Triangulation of GRB 160225B
  61. GRB 160225A: Continued RATIR Optical and NIR Observations
  62. GRB 160225A: RATIR Optical and NIR Observations
  63. GRB 160225A: Swift/UVOT Upper Limits
  64. GRB 160225A: NOT optical observations
  65. GRB 160225A: WHT LIRIS observations
  66. GRB 160225A: MITSuME Okayama Optical Observation
  67. GRB 160223A: RATIR Optical and NIR Observations
  68. GRB 160225A: Enhanced Swift-XRT position
  69. GRB 160225A: Swift detection of a burst
  70. GRB 160221A: Swift-XRT afterglow detection
  71. GRB 160223A: AbAO optical observations
  72. GRB 160223A: Swift-BAT refined analysis
  73. GRB 160223B: Khureltogot optical observations
  74. GRB 160223B: Swift-XRT observations
  75. GRB 160223B: Swift ToO observations
  76. GRB 160223A: GROND optical/NIR afterglow
  77. LVC GW 150914: TAROT/TZAC Final analysis correction
  78. GRB 160221A: GROND upper limits
  79. GRB 160220B: Further GROND Observations
  80. Further Swift/UVOT observations of GRB 160220B
  81. LVC GW 150914: TAROT/TZAC Final analysis
  82. GRB 160221A: Swift ToO observations
  83. GRB 160220B: GROND Observations
  84. GRB 160220A: nIR observations at AAT
  85. GRB160220B: Swift/UVOT observations
  86. GRB 160220B: Swift-XRT refined Analysis
  87. IPN Triangulation of GRB 160219A (short/hard)
  88. LIGO/Virgo GW150914
  89. GRB160220B: Enhanced Swift-XRT position
  90. GRB160220A: Swift/UVOT observations
  91. GRB 160220A: TAROT Calern and TAROT La Silla observatory optical observations
  92. GRB 160220A: GROND Optical/NIR Upper Limits
  93. GRB 160220A: Enhanced Swift-XRT position
  94. GRB 160220A: Swift-XRT observations
  95. GRB 160216A: Swift-XRT refined Analysis
  96. LIGO/Virgo G184098: Correction for GCN Circular 18361
  97. GRB 160216A: Swift/UVOT Upper Limits
  98. GRB 160216A: Enhanced Swift-XRT position
  99. GRB 160216A: Swift detection of a burst
  100. GRB 160206A: Kiso/KWFC optical observations

Advanced

Download all Circulars as a .tar.gz archive:
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