Skip to main content
New! Browse Circulars by Event, Advanced Search, Sample Codes, Schema Release. 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"

3400 results found.

  1. Trigger 441015 / GRB 101225A: Further NOT optical observation
  2. GRB 101224A, Swift-BAT refined analysis
  3. XRF 101117A, RIMOTS optical upper limits
  4. Swift detection of MAXIJ1409-619
  5. GRB 101123A: Fermi GBM detection
  6. XRF 101117A: Palomar Transient Factory Observations
  7. GRB 101117B: Swift-BAT refined analysis
  8. XRF101117A: MAXI/GSC detection of a short X-ray transient
  9. GRB 101112A: optical observations
  10. GRB 101030A: Swift detection of a burst
  11. Konus-Wind observation of GRB 101023A
  12. GRB 101024A: Swift-BAT refined analysis
  13. GRB 101023A: Swift-BAT refined analysis
  14. GRB 101008A: optical observations
  15. GRB 100925A / MAXI J1659-152: MASTER optical observations
  16. GRB 100924A: Fermi GBM observation
  17. GRB 100925A / MAXI J1659-152: WSRT Radio and Polarization Detection
  18. GRB 100925A / MAXI J1659-152: Optical observation with the Kottamia 188cm telescope
  19. GRB100925A/MAXI J1659-152: X-shooter identification as an X-ray binary
  20. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  21. GRB 100925A / MAXI J1659-152: SARA-S Observations
  22. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  23. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  24. GRB 100925A/MAXI J1659-152 - NOT optical observations
  25. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  26. MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)
  27. GRB 100915A: Swift-BAT refined analysis
  28. GRB100906A: R band observations
  29. GRB 100901A: ISON-NM optical observations
  30. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  31. GRB 100902A: MASTER Prompt Optical Observations
  32. GRB100901A: MITSuME Okayama Optical Observation
  33. GRB 100823A: MAXI/GSC detection
  34. GRB 100816A, Swift-BAT refined analysis
  35. GRB 100814A: CQUEAN r- and i-band Observation
  36. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  37. GRB 100805A: optical observation in CrAO
  38. Trigger 430975: Swift detection of a possible burst
  39. GRB 100725B: Swift-BAT refined analysis
  40. GRB 100725B: Enhanced Swift-XRT position
  41. GRB 100725B: Swift detection of a burst
  42. GRB 100719A: Swift-BAT refined analysis
  43. GRB 100719A: Swift detection of a burst
  44. Konus-Wind observation of GRB 100707A
  45. XRF 100701A : MAXI/GSC detection of a probable XRF
  46. GRB 100628A: Swift-BAT refined analysis
  47. GRB 100625A: Swift detection of a short hard burst
  48. Konus-Wind observation of GRB 100621A
  49. XRF 100616a : MAXI/GSC detection of a probable XRF
  50. Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
  51. GRB 100513A: CrAO optical observations
  52. GRB 100514A: Faulkes Telescope South observations
  53. GRB 100510A: Fermi GBM detection/observation
  54. GRB 100510A: MAXI/GSC detection
  55. GRB 100420A: Gemini discovery of infrared afterglow
  56. Konus-Wind observation of GRB 100423A
  57. GRB 100424A: CrAO optical observations
  58. GRB 100424A: Gemini/NIRI Candidate Afterglow
  59. GRB 100415A: MAXI/GSC detection of a probable GRB
  60. GRB 100413A: SARA upper limit
  61. Konus-Wind observation of GRB 100324B
  62. Short X-ray Transient detected by MAXI/GSC
  63. GRB 100322A: Suzaku WAM observation of the prompt emission
  64. Swift-BAT refined analysis of the probable new SGR 1833-0832
  65. XRF 100315A: MAXI/GSC detection of a short X-ray transient
  66. GRB 100316C: Swift detection of a burst
  67. GRB 100213B: Swift-BAT refined analysis
  68. GRB 100205A: Swift detection of a burst
  69. Short X-ray Transient detected by MAXI/GSC
  70. Konus-Wind observation of GRB 100103A
  71. GRB091208B: Swift/UVOT refined analysis
  72. GRB 091208B: MITSuME Okayama Optical Observation
  73. GRB 091208B: Swift detection of a burst with an optical afterglow
  74. GRB 091208B: BOOTES-3 optical afterglow
  75. GRB 091208: ROTSE-III Optical Limits
  76. Short X-ray Transient, RIMOTS optical upper limits
  77. Short X-ray Transient Detection by MAXI/GSC
  78. Konus-Wind observation of GRB 091127
  79. GRB 091127: Swift-XRT afterglow detection and analysis
  80. GRB 091127: TAROT La Silla observatory optical decay
  81. GRB 091127: Swift/UVOT observations
  82. GRB 091127: CAHA 1.23m I-band observations
  83. GRB 091127: REM NIR afterglow detection
  84. GRB 091127: Swift/UVOT Detection of an Optical Afterglow
  85. GRB 091127: Liverpool Telescope afterglow candidate
  86. GRB 091127: Swift detection of a burst
  87. IPN Triangulation of GRB091120
  88. Konus-Wind observation of GRB 091120
  89. GRB 091120: MAXI GSC detection
  90. GRB 091109: Swift detection of a burst with optical afterglow
  91. GRB 091029: Observations from Stardome Observatory
  92. GRB091102 : MOA optical upper limit
  93. GRB 091018, SMARTS optical/IR afterglow observations
  94. GRB091029: Swift/UVOT observations
  95. GRB 091029: Swift-BAT refined analysis
  96. GRB 091029: Enhanced Swift-XRT position
  97. GRB 091029: GROND Detection of the Optical/NIR Afterglow
  98. GRB 091029: Swift detection of a burst with an optical counterpart
  99. GRB 091018: miniTAO/ANIR Observations
  100. GRB 091018: Swift-BAT refined analysis

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