Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! 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"

1010 results found.

  1. Konus-Wind observation of GRB 110213B
  2. GRB 110213B: MAXI/GSC refined analysis
  3. GRB 110213B: MAXI/GSC detection of a probable GRB
  4. GRB 110210A: optical upper limit
  5. New feature in Fermi GBM GRB Ground Position Notices
  6. GRB 101225A: MAXI/GSC observations
  7. XRF 101117A, RIMOTS optical upper limits
  8. Swift detection of MAXIJ1409-619
  9. XRF 101117A: Palomar Transient Factory Observations
  10. GRB 101117B: Swift-BAT refined analysis
  11. XRF101117A: MAXI/GSC detection of a short X-ray transient
  12. GRB 100925A / MAXI J1659-152: MASTER optical observations
  13. GRB 100925A / MAXI J1659-152: WSRT Radio and Polarization Detection
  14. GRB 100925A / MAXI J1659-152: Optical observation with the Kottamia 188cm telescope
  15. GRB100925A/MAXI J1659-152: X-shooter identification as an X-ray binary
  16. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  17. GRB 100925A / MAXI J1659-152: SARA-S Observations
  18. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  19. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  20. GRB 100925A/MAXI J1659-152 - NOT optical observations
  21. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  22. MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)
  23. GRB 100823A: MAXI/GSC detection
  24. GRB 100713A: optical upper limit
  25. XRF 100701A : MAXI/GSC detection of a probable XRF
  26. XRF 100616a : MAXI/GSC detection of a probable XRF
  27. GRB 100510A: Fermi GBM detection/observation
  28. GRB 100510A: MAXI/GSC detection
  29. GRB100508A: Further Swift/UVOT Observations
  30. GRB100508A: Swift/UVOT Detection of the Afterglow
  31. GRB 100415A: MAXI/GSC detection of a probable GRB
  32. Short X-ray Transient detected by MAXI/GSC
  33. XRF 100315A: MAXI/GSC detection of a short X-ray transient
  34. Short X-ray Transient detected by MAXI/GSC
  35. Short X-ray Transient, RIMOTS optical upper limits
  36. Short X-ray Transient Detection by MAXI/GSC
  37. IPN Triangulation of GRB091120
  38. Konus-Wind observation of GRB 091120
  39. GRB 091120: MAXI GSC detection
  40. GRB 090926B: MAXI GSC detection
  41. GRB 090831A: Suzaku WAM observation of the prompt emission
  42. GRB 090831A: IPN Triangulation
  43. GRB 090831: MAXI GSC detection
  44. GRB 090812: Konus-Wind and Swift/BAT joint spectral analysis
  45. IPN Triangulation and Konus-Wind observaions of GRB090727B
  46. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  47. GRB 081130B: Fermi GBM detection
  48. GRB 080723A: optical upper limit
  49. GRB 080702A: optical upper limit
  50. GRB 080325: optical upper limit
  51. GRB 080319B: optical upper limit
  52. GRB 080319D: optical upper limit
  53. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  54. GRB 080205: optical observation
  55. GRB071118: Swift XRT refined analysis
  56. GRB 071112C: optical observation
  57. GRB 070612B: optical observations
  58. GRB 070520A: Swift UVOT Upper Limits
  59. GRB 070311: Optical observation.
  60. GRB 070125: optical observation
  61. GRB 070125: optical observations
  62. GRB061202: FRAM early follow-up limit
  63. GRB 061027, Swift refined analysis of a possible burst
  64. GRB060929: Optical limit
  65. GRB 060927 optical limit
  66. GRB060906 , optical observation
  67. GRB 060906: Swift-UVOT observations
  68. GRB 060906: Swift detection of a probable burst
  69. GRB060904b, optical observations
  70. GRB 060814: Suzaku/WAM observation of the prompt emission
  71. GRB060526, optical observations
  72. GRB060526, optical observations
  73. GRB 060502B: optical observations
  74. GRB060403: Optical Limit
  75. GRB060218, optical observations
  76. GRB 060218: Swift-BAT detection of a possible burst
  77. GRB060206, optical observations
  78. GRB060124 optical observations
  79. GRB 060111: TAROT optical observation
  80. Konus-Wind observation of GRB 051221A
  81. GRB051111: Rc optical observations
  82. GRB050805A: Rc optical observations
  83. GRB 050401: Rc observation
  84. GRB 050416b: Tentative Swift XRT Position
  85. GRB050319, optical observations
  86. GRB 041218: optical observations
  87. GRB041218: optical observations
  88. GRB 041006 R observations in Loiano
  89. GRB040825A: optical observations
  90. GRB040825B: optical observations
  91. GRB040624, optical observations
  92. IPN Summary of SGR1806-20 Activity in 2004
  93. GRB040422, optical observations at Loiano
  94. GRB030418: R optical observations
  95. GRB030329: R and B observations
  96. GRB030328: R optical observation
  97. GRB030329 optical observations
  98. GRB030324, optical observations
  99. GRB030226, addendum to GCN 1892
  100. GRB030226: optical observation

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