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"

28100 results found.

  1. A giant outburst from Cygnus X-1 detected by Konus-Wind and Suzaku-WAM
  2. GRB 070809: Swift/UVOT Upper Limits
  3. VLA upper limit on the short hard burst GRB 070729
  4. No radio detection in superAGILE burst 070724B
  5. GRB 070809: Keck Imaging
  6. GRB 070810: Swift-XRT Team Refined Analysis
  7. GRB 070809: Swift-XRT refined analysis
  8. GRB 070810: enhanced Swift-XRT position
  9. GRB 070810: Swift/UVOT Optical Counterpart
  10. GRB 070809, Swift-BAT refined analysis
  11. GRB 070808: Swift/UVOT upper limits
  12. GRB 070809: Swift detection of a short burst
  13. GRB 070808 : Faulkes Telescope South Observations
  14. GCN Swift XRT update position notices and enhanced position circulars
  15. GRB 070808: Swift XRT refined analysis
  16. GRB 070808, Swift-BAT refined analysis
  17. GRB 070808: OPTIMA-Burst optical upper limit
  18. GRB 070808: Xinglong TNT optical Upper Limit
  19. GRB070808: Optical observations with KANATA
  20. GRB070808 - SDSS Pre-Burst Observations
  21. GRB 070808: ROTSE-III Optical Limits
  22. GRB070805 XRT and UVOT afterglow candidate
  23. GRB070612A: Radio upper limit from GMRT
  24. GRB 070721B: correct afterglow position
  25. Swift/UVOT observations of GRB070805
  26. GRB 070805, Swift-BAT refined analysis
  27. UVOT observations of SAXJ1810.8-2609
  28. Swift detection of a outburst from SAX J1810.8-2609
  29. VLA non-detection of GRB 070721B
  30. GRB 070802: REM optical observations
  31. GRB 070802: Swift-XRT refined analysis
  32. GRB070802: Swift/UVOT upper limits
  33. GRB 070802, Swift-BAT refined analysis
  34. GRB 070802: V-band detection of the candidate afterglow
  35. GRB 070802: GROND J band candidate
  36. GRB 070731, Swift-BAT refined analysis
  37. Konus-A observation of GRB 070729
  38. Swift/UVOT detection of GRB070714B
  39. VLA upper limit on short hard burst GRB 070714B
  40. Intense burst from SGR 1806-20 detected on July 27
  41. GRB070729: Swift/UVOT upper limits
  42. GRB 070729: Swift-XRT refined analysis
  43. GRB 070729, Swift-BAT refined analysis
  44. GRB 070724B: P60 Observations
  45. GRB 070724B: Swift/UVOT Upper limits
  46. GRB 070724B: Swift-XRT afterglow likely candidate
  47. GRB 070721A: optical observations
  48. GRB 070724A: further VLT observations
  49. GRB 070724B: Suzaku WAM observation of the prompt emission
  50. GRB 070724B: Swift-XRT afterglow candidates
  51. Four radio sources in Swift-XRT error box of GRB 070724
  52. GRB 070724: P60 and Gemini Observations
  53. GRB 060814 - Keck host detection and redshift
  54. Swift/UVOT refined analysis of GRB070724
  55. GRB 070724: Swift-XRT Team refined analysis
  56. GRB 070724, Swift-BAT refined analysis of a short burst
  57. GRB 070721B: further observations and analysis
  58. GRB 070724: Swift detection of a burst
  59. GRB 070326: Detection of first burst from BAT Slew Survey (BATSS)
  60. GRB 070714B: Keck observations
  61. GRB 070721B: optical observations and proposed redshift
  62. GRB 070721B, Further Swift-BAT refined analysis
  63. Swift/UVOT Observations of GRB070721A
  64. GRB 070721B : Faulkes Telescope South observations
  65. GRB 070721B: Swift-XRT refined analysis
  66. GRB 070721A : Faulkes Telescope South optical limit
  67. GRB 070721A: Swift/XRT refined analysis
  68. GRB 070721B, Swift-BAT refined analysis
  69. GRB 070721A, Swift-BAT refined analysis
  70. GRB070721B: A bright UVOT candidate
  71. GRB 070714B: Swift/BAT and Suzaku/WAM joint spectral analysis
  72. GRB 070714B : Suzaku WAM observation of the prompt emission
  73. GRB070714B: TNG NIR observations
  74. Erratum : Suzaku WAM observation of GRB 070704
  75. GRB 070714A: Swift/UVOT Upper limits
  76. GRB 070714B: Swift/UVOT Upper Limits
  77. GRB 070714B: confirmation of optical afterglow
  78. GRB 070616: No Evidence for I Band Afterglow
  79. GRB 070714A: Swift XRT refined analysis
  80. GRB070714B: Swift-XRT refined analysis
  81. GRB 070707: Swift-XRT follow-up observations
  82. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  83. GRB 070714A, Swift-BAT refined analysis
  84. GRB 070714 : Liverpool Telescope optical counterpart ?
  85. GRB 070714: Swift detection of a bright burst, possibly short
  86. SN 2007bg - off-axis GRB?
  87. GRB 070704: RTT150 optical observations
  88. GRB 070704: Suzaku/WAM observation of the prompt emission
  89. Konus-Wind observation of GRB 070707
  90. GRB 070707: optical afterglow
  91. Swift/UVOT Observations of GRB070707
  92. Swift XRT observation of GRB 070707
  93. GRB 070707: VLT observations
  94. GRB070704: FAVOR optical observations
  95. GRB 070704 : Liverpool Telescope Observations
  96. GRB 070611: VLT observations
  97. VLA detection of GRB 070612A in C Band
  98. GRB 070704: Swift-XRT refined analysis
  99. Swift/UVOT Observations of GRB070704
  100. GRB 070704, Swift-BAT refined analysis

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