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"

19611 results found.

  1. GRB 100728A: GROND host detection and X-shooter redshift
  2. GRB 130427A: Skynet/PROMPT Observations
  3. GRB 130427B: RATIR Optical and NIR Observations
  4. GRB 130427A, Optical Observations
  5. Konus-Wind observation of GRB 130427A
  6. GRB 130427A: Kanata/HOWPol optical imaging polarimetry
  7. GRB 130427A: Swift-XRT refined Analysis
  8. GRB 130427A: SPI-ACS/INTEGRAL observations
  9. GRB 130427B: Swift-XRT refined Analysis
  10. GRB 130427A: RAPTOR Bright Counterpart Before Swift Trigger
  11. GRB 130427A: T100 observations
  12. GRB 130427A: optical observations in CrAO
  13. GRB 130427A: Fermi GBM observation
  14. GRB130427A: Swift/UVOT followup observations of an Optical Afterglow
  15. GRB 130427A: Fermi-LAT detection of a burst
  16. GRB 130427A: Swift-BAT refined analysis
  17. GRB 130427B: Swift-BAT refined analysis
  18. GRB 130427A: Zadko observatory - Gingin optical observations
  19. GRB 130427B: Enhanced Swift-XRT position
  20. GRB 130427A: MAXI/GSC detection
  21. GRB 130427B: Faulkes Telescope North afterglow detection
  22. GRB 130427B: Swift detection of a burst with optical counterpart
  23. GRB 130427A: Continued P60 follow-up of an extremely bright optical afterglow
  24. GRB 130427A: PAIRITEL NIR Detections
  25. GRB 130427A: Faulkes Telescope North detection
  26. GRB 130427A: early optical observations
  27. GRB 130427A: Swift detection of a very bright burst with a likely bright optical counterpart
  28. GRB 130420A: Continued Skynet/GORT Observations/Detections
  29. GRB 130420B: CARMA and VLA radio observations
  30. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  31. GRB 130420A: Continued RATIR Optical and NIR Observations
  32. GRB 130420A: ROTSE-III data analysis
  33. GRB 130420A: Continued RATIR Optical and NIR Observations
  34. GRB 130420A: Early RAPTOR Simultaneous Multi-Color Observations
  35. GRB 130420B: Fermi GBM observation
  36. Swift Trigger 554135 is probably not a GRB or transient
  37. GRB 130420B: RATIR Optical and NIR Observations
  38. GRB 130420B: Swift-XRT refined Analysis
  39. GRB 130420A: Fermi GBM observation
  40. GRB 130420A: ISON-NM optical observations
  41. Skynet/GORT observations of GRB130420A
  42. GRB 130420B: Swift/UVOT Upper Limits
  43. GRB 130420A: Swift/UVOT Detection
  44. GRB 130420A: Swift-XRT refined Analysis
  45. GRB 130420B: Enhanced Swift-XRT position
  46. GRB 130420B, Swift-BAT refined analysis
  47. GRB 130420A, Swift-BAT refined analysis
  48. Konus-Wind observation of GRB 130418A
  49. GRB 130420A: Enhanced Swift-XRT position
  50. GRB 130420B: MASTER-Net optical observations
  51. GRB 130420B: Swift detection of a burst
  52. GRB 130420A: RATIR Optical and NIR Observations
  53. GRB 130420A: PAIRITEL NIR detections
  54. GRB 130420A: ROTSE-III Detection of Optical Counterpart
  55. GRB 130420A: Swift detection of a burst with an optical counterpart
  56. GRB 130420A: Faulkes Telescope North candidate
  57. GRB 130418A: Swift-XRT refined Analysis
  58. Swift Trigger 553930 is not an astrophysical source
  59. GRB 130419A, Swift-BAT refined analysis
  60. GRB 130327B: Swift/XRT source is not the afterglow
  61. GRB 130419B (Swift trigger Trigger 553930): MASTER-Net optical observations
  62. Trigger 553930: Swift detection of a possible flare from HR 5110
  63. GRB 130418A, Swift-BAT refined analysis
  64. GRB 130419A: Swift detection of a burst
  65. GRB 130418A: RATIR Optical and NIR Observations
  66. GRB 130418A: GROND detection of the optical-NIR afterglow
  67. GRB 130418A: Swift/UVOT Detection and request for continuing coverage
  68. GRB 130418A: Enhanced Swift-XRT position
  69. GRB 130418A: TAROT Calern and TAROT la Silla observatory optical observations
  70. GRB 130418A: Bassano Bresciano Observatory optical observations
  71. GRB 130418A: Swift detection of a burst with an optical counterpart
  72. GRB 130408a: Skynet Optical Observations
  73. GRB 130408A, Swift-BAT refined analysis
  74. GRB 130408A: Zadko observatory - Gingin optical observations
  75. GRB 130407A: Swift-XRT observations
  76. GRB130408A: Swift/UVOT followup observations
  77. GRB 130408A: Swift-XRT refined Analysis
  78. Konus-Wind observation of GRB 130408A
  79. GRB 130408A: Enhanced Swift-XRT position
  80. GRB 130408A: GROND detection of the afterglow
  81. GRB 130408A: Swift/UVOT Detection of the Optical Afterglow
  82. GRB 130408A: Liverpool Telescope Optical candidate detection
  83. GRB 130408A: Swift detection of a burst
  84. GRB 130407A Tiled Swift observations
  85. GRB 130211A: Retraction of afterglow candidate
  86. GRB 130327B: Suzaku WAM observation of the prompt emission
  87. Swift detection of IGR J18245-2452
  88. IPN Triangulation of GRB 130320B (very long/bright)
  89. Swift/XRT observation of GRB 130327B
  90. GRB 130306A: Confirmation of the X-ray Afterglow
  91. Swift Trigger 552142 is a noise event
  92. GRB 130327B: Fermi-LAT detection of a burst
  93. Swift Trigger 552142: a possible GRB
  94. GRB 130327A: Swift-BAT refined analysis
  95. GRB 130327A: Swift-XRT refined Analysis
  96. GRB 130327A: Swift/UVOT Upper Limits
  97. GRB 130327A: ISON-NM optical upper limit
  98. GRB 130325A Tiled Swift observations
  99. GRB 130327A: Enhanced Swift-XRT position
  100. GRB 130327A: PAIRITEL NIR Afterglow Candidate

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