Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

37349 results found.

  1. Fermi Gamma-ray Burst Monitor trigger 396484884 / 130725945 is not a GRB
  2. GRB 130725A: Swift-XRT refined Analysis
  3. GRB 130725B, Swift-BAT refined analysis
  4. GRB 130725B: Swift-XRT refined Analysis
  5. GRB130725B: REM-ROS2 optical observations
  6. GRB 130725B - UVOT-enhanced XRT position
  7. Fermi Gamma-ray Burst Monitor trigger 396533554 / 130726509 is not a GRB
  8. GRB 130725A: Swift/UVOT Upper Limits
  9. GRB 130725A - Faulkes Telescope South Observations
  10. GRB 130725B: GROND Detection of the Optical/NIR Afterglow
  11. GRB 130725A: MITSuME Ishigakijima Optical Observation
  12. GRB 130725B: Swift/UVOT Detection of an Optical Counterpart
  13. GRB 130725A, Swift-BAT refined analysis
  14. GRB 130719A: Skynet/PROMPT observations
  15. GRB 130725B: Swift detection of a burst
  16. Swift Trigger 563980 is GRB 130725A
  17. Fermi Gamma-ray Burst Monitor trigger 396447899 / 130725517 is not a GRB
  18. GRB 130702A in the Ep,i - Eiso plane
  19. Retraction of GCN Circ. 15020 (GRB 130722C Tiled Swift observations)
  20. Konus-Wind observation of GRB 130722A
  21. GRB 130722A: Swift/UVOT Detection
  22. GRB 130722A: MITSuME Okayama upper limits
  23. GRB 130722C Tiled Swift observations
  24. GRB 130722A: Enhanced Swift-XRT position
  25. GRB 130722A: Swift-XRT refined Analysis
  26. GRB 130722A: Skynet/GORT observations
  27. GRB 130719A, Swift-BAT refined analysis
  28. GRB 130722A: Faulkes Telescope South optical candidate
  29. GRB 130715A: Suzaku WAM observation of the prompt emission
  30. GRB 130722A: Swift detection of a burst
  31. GRB 130719A: Swift detection of a burst
  32. GRB 130716A: Fermi GBM observation
  33. GRB 130716A Swift-BAT Spectral lag analysis
  34. GRB 130702A : Xinglong TNT continue optical observation
  35. GRB 130716A: Gemini-North imaging
  36. GRB 130716A: UVOT Upper Limits
  37. GRB 130716A: Probable short-hard burst with delayed Swift data
  38. GRB 130715A: Fermi GBM detection
  39. GRB 130626A: Retraction of possible X-ray afterglow
  40. GRB 130702A: Maidanak optical observations
  41. GMRT radio detection of GRB 130702A
  42. GRB 130708A: Swift XRT and UVOT Observations
  43. GRB 130702A: TNG spectroscopic observations of the emerging supernova
  44. GRB 130708A: Fermi GBM observation
  45. GRB 130702A: P200 Spectroscopic Confirmation of Associated Supernova
  46. GRB 130708A found in ground analysis of Swift-BAT data
  47. GRB 130702A: Maidanak optical observations
  48. GRB 130628A: Suzaku WAM observation of the prompt emission
  49. GRB130702A: NOT observation - the detection of an emerging supernova
  50. GRB 130702A: Continued RATIR Optical and NIR Observations
  51. GRB 130702A: Xinglong TNT optical observation
  52. GRB 130702A: Continued UVOT Observations
  53. GRB 130702A: VLA detection
  54. GRB 130702A (= Fermi 394416326): correction of the GCN #14988 title
  55. GRB 130702Ð
  56. GRB 130702A: WSRT radio detection
  57. Konus-Wind observation of GRB 130702A
  58. GRB 130702A: further TNG observations
  59. GRB 130702A: NOT spectroscopy and redshift of the nearby bright galaxy
  60. GRB 130702A: further Swift-XRT observations
  61. GRB 130702A: Continued P60 observations
  62. GRB 130702A: RATIR Optical and NIR Observations
  63. GRB 130702A: CARMA 3mm detection
  64. GRB 130702A: NOT optical observations
  65. GRB 130702A: TNG optical observations
  66. GRB 130702A / Fermi394416326 : Nanshan optical observations
  67. IPN localization of GRB 130702A (= Fermi 394416326)
  68. Fermi GRB 130702A: Swift XRT and UVOT observations
  69. GRB 130702A / Fermi394416326: Fermi GBM detection
  70. GRB 130702A / Fermi394416326 : Fermi-LAT detection of a burst
  71. Fermi GBM trigger 394416326: MASTER early optical limit
  72. GRB 130628A: Fermi GBM detection
  73. Fermi394416326: FTN detection
  74. Fermi394416326: iPTF detection of a possible optical afterglow
  75. GRB 130627B: Swift afterglow confirmation
  76. Fermi GBM trigger 394325281 / 130630950 is not a GRB
  77. GRB 130623A: Second Swift-XRT observation
  78. GRB 130701A: MITSuME Akeno Optical observation
  79. GRB 130701B: Fermi GBM detection
  80. GRB 130701A: Swift-XRT refined Analysis
  81. GRB 130701A: P60 Observations
  82. GRB 130701A, Swift-BAT refined analysis
  83. Konus-Wind observation of GRB 130701A
  84. GRB 130701A: Swift/UVOT Detection
  85. GRB 130701A: VLT/X-shooter redshift
  86. GRB 130701A: Enhanced Swift-XRT position
  87. GRB 130701A: optical afterglow from the NOT
  88. GRB 130701A: Swift detection of a burst
  89. GRB 130627B, Swift-BAT refined analysis
  90. GRB 130627A, Swift-BAT refined analysis
  91. GRB 130627B: Swift/UVOT Upper Limits
  92. GRB 130627A: Swift/UVOT Upper Limits
  93. GRB 130627A: Swift-XRT refined Analysis
  94. GRB 130627B: Possible Swift-XRT afterglow detection
  95. GRB 130627A: Enhanced Swift-XRT position
  96. GRB 130626A: KAIT Optical Observations
  97. GRB 130626A: RATIR Optical Observations
  98. GRB 130626A, Swift-BAT refined analysis
  99. GRB 130627A: Fermi GBM detection
  100. GRB 130623A: Fermi GBM 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