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"

37707 results found.

  1. Swift-BAT trigger 155072 is probably not a GRB
  2. GRB 050911: LCO limits on a variable source
  3. GRB 050908: DEIMOS spectrum and further analysis
  4. Swift is in normal operation
  5. GRB 050911, optical content of Swift/XRT error box
  6. GRB 050911: LCO observations
  7. GRB 050911, optical observations
  8. GRB 050911: Swift-BAT refined analysis
  9. Later Swift-BAT triggers 154632 and 154633 RETRACTION
  10. GRB 050911: z~0.16 cluster in the field
  11. GRB 050910a: TAROT early optical limits
  12. RBO GRB 050908 observations
  13. WIRO observations in I of GRB 050908
  14. GRB 050906: Possible X-ray Counterpart
  15. GRB 050906: RTT150 optical observations
  16. GRB050908: VLT R-band decay index.
  17. GRB 050908: Swift-BAT refined analysis
  18. GRB 050908: Optical observations
  19. Gemini Spectroscopy of GRB 050908
  20. GRB 050908: spectroscopic redshift
  21. GRB 050908: Prompt PROMPT Observations
  22. GRB 050908 : Swift XRT position
  23. GRB 050908: KAIT observations
  24. GRB 050908: P60 Confirmation of Optical Afterglow
  25. GRB 050908: Optical Observations
  26. GRB 050908: Swift detection of a burst
  27. Swift trigger 154073 is not a GRB
  28. GRB 050906: Optical observations at the Very Large Telescope
  29. GRB050904: CrAO optical observations
  30. GRB 050904 BAT refined analysis of complete data set
  31. GRB 050904: Subaru Optical Spectroscopy
  32. GRB 050906: MARGE Optical Limits
  33. GRB 050906: Swift-BAT refined analysis
  34. GRB 050906: Swift XRT upper limit
  35. GRB 050906: Radio Observations
  36. GRB 050904: Keck I-band Imaging
  37. GRB 050904: more VLT NIR observations
  38. GRB 050904: BOOTES early R-band observation
  39. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  40. GRB 050906: Bright galaxy in BAT error box
  41. GRB 050906: Swift/BAT Detection of a possible burst
  42. GRB 050904: More SOAR
  43. GRB 050904: photometric redshift
  44. GRB 050904: Swift/UVOT observations
  45. GRB 050904: Afterglow Astrometry
  46. GRB 050904: NIR object inside the XRT error box
  47. GRB 050904: early Swift XRT analysis results
  48. GRB 050904: SOAR YJ and PROMPT Ic Observations
  49. GRB 050904: BAT refined analysis of partial data set
  50. GRB 050904: TAROT optical measurements
  51. GRB050904: Optical Observations
  52. GRB 050904: Environmental Constraints
  53. GRB 050904: Possible High-Redshift GRB
  54. GRB 050904: SOAR/PROMPT Observations
  55. GRB 050904: TAROT optical limits
  56. Swift-BAT triggers 153461-153465 are not GRBs
  57. GRB 050824: MDM Observations
  58. GRB 050827: Swift XRT preliminary analysis results
  59. IBAS Alerts 2641 and 2642: not a real GRB
  60. Swift Trigger #152652 is not a GRB
  61. GRB 050827 : OSN 1.5m optical observations
  62. GRB 050827: P200 NIR Observations
  63. GRB 050827: Optical Limit
  64. GRB 050827: XRT possible afterglow detection
  65. GRB 050826 : Lulin R band observation
  66. GRB050824: Maidanak optical limits
  67. GRB050820A: RTT150 optical observations
  68. GRB050827: RTT150 optical observations
  69. GRB 050827: Swift-BAT refined analysis
  70. GRB 050826: Optical Candidate
  71. GRB050824, HETE-2 Observation
  72. GRB 050826: Swift XRT preliminary analysis results
  73. GRB 050826: BAT refined analysis
  74. GRB050824: First 2 hours of power low optical decay?
  75. GRB 050826: Swift XRT position
  76. GRB050826: Swift-BAT detection of a long burst
  77. GRB050824: MASTER final analysis of the OT observations
  78. Possible GRB050825:MASTER optical observations
  79. Swift-BAT trigger 152038 is definitely not a GRB
  80. Swift-BAT trigger 152038 is probably not a GRB
  81. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  82. GRB050824, I-band imaging
  83. GRB050824: Radio Observations
  84. GRB 050824: Spectroscopic redshift from the VLT
  85. GRB 050822: refined XRT analysis
  86. GRB 050824: XRT refined analysis and possible afterglow detection
  87. GRB 050824: BAT refined analysis of a soft weak burst
  88. GRB050824: MASTER:OT decay
  89. GRB050824: MASTER observation OT
  90. GRB050805a: MASTER optical candidat
  91. GRB 050824: ROTSE-III Optical Limits
  92. GRB050824: Swift-BAT detection of a burst
  93. GRB 050824 optical candidate
  94. GRB050820A: RTT150 optical observations
  95. GRB050820a: PROMPT RcIc Observations
  96. GRB050815: Maidanak optical observation
  97. XRF050509c: Radio upper limits from GMRT
  98. VLT/UVES spectroscopy of GRB050820
  99. GRB 050820A BAT observations of second, larger episode of emission
  100. GRB050813: Maidanak I-band observations

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