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"

36211 results found.

  1. GRB 050908: DEIMOS spectrum and further analysis
  2. Swift is in normal operation
  3. GRB 050911, optical content of Swift/XRT error box
  4. GRB 050911: LCO observations
  5. GRB 050911, optical observations
  6. GRB 050911: Swift-BAT refined analysis
  7. Later Swift-BAT triggers 154632 and 154633 RETRACTION
  8. GRB 050911: z~0.16 cluster in the field
  9. GRB 050910a: TAROT early optical limits
  10. RBO GRB 050908 observations
  11. WIRO observations in I of GRB 050908
  12. GRB 050906: Possible X-ray Counterpart
  13. GRB 050906: RTT150 optical observations
  14. GRB050908: VLT R-band decay index.
  15. GRB 050908: Swift-BAT refined analysis
  16. GRB 050908: Optical observations
  17. Gemini Spectroscopy of GRB 050908
  18. GRB 050908: spectroscopic redshift
  19. GRB 050908: Prompt PROMPT Observations
  20. GRB 050908 : Swift XRT position
  21. GRB 050908: KAIT observations
  22. GRB 050908: P60 Confirmation of Optical Afterglow
  23. GRB 050908: Optical Observations
  24. GRB 050908: Swift detection of a burst
  25. Swift trigger 154073 is not a GRB
  26. GRB 050906: Optical observations at the Very Large Telescope
  27. GRB050904: CrAO optical observations
  28. GRB 050904 BAT refined analysis of complete data set
  29. GRB 050904: Subaru Optical Spectroscopy
  30. GRB 050906: MARGE Optical Limits
  31. GRB 050906: Swift-BAT refined analysis
  32. GRB 050906: Swift XRT upper limit
  33. GRB 050906: Radio Observations
  34. GRB 050904: Keck I-band Imaging
  35. GRB 050904: more VLT NIR observations
  36. GRB 050904: BOOTES early R-band observation
  37. GRB 050904: Did SWIFT/XRT see the prompt GRB emission ?
  38. GRB 050906: Bright galaxy in BAT error box
  39. GRB 050906: Swift/BAT Detection of a possible burst
  40. GRB 050904: More SOAR
  41. GRB 050904: photometric redshift
  42. GRB 050904: Swift/UVOT observations
  43. GRB 050904: Afterglow Astrometry
  44. GRB 050904: NIR object inside the XRT error box
  45. GRB 050904: early Swift XRT analysis results
  46. GRB 050904: SOAR YJ and PROMPT Ic Observations
  47. GRB 050904: BAT refined analysis of partial data set
  48. GRB 050904: TAROT optical measurements
  49. GRB050904: Optical Observations
  50. GRB 050904: Environmental Constraints
  51. GRB 050904: Possible High-Redshift GRB
  52. GRB 050904: SOAR/PROMPT Observations
  53. GRB 050904: TAROT optical limits
  54. Swift-BAT triggers 153461-153465 are not GRBs
  55. GRB 050824: MDM Observations
  56. GRB 050827: Swift XRT preliminary analysis results
  57. IBAS Alerts 2641 and 2642: not a real GRB
  58. Swift Trigger #152652 is not a GRB
  59. GRB 050827 : OSN 1.5m optical observations
  60. GRB 050827: P200 NIR Observations
  61. GRB 050827: Optical Limit
  62. GRB 050827: XRT possible afterglow detection
  63. GRB 050826 : Lulin R band observation
  64. GRB050824: Maidanak optical limits
  65. GRB050820A: RTT150 optical observations
  66. GRB050827: RTT150 optical observations
  67. GRB 050827: Swift-BAT refined analysis
  68. GRB 050826: Optical Candidate
  69. GRB050824, HETE-2 Observation
  70. GRB 050826: Swift XRT preliminary analysis results
  71. GRB 050826: BAT refined analysis
  72. GRB050824: First 2 hours of power low optical decay?
  73. GRB 050826: Swift XRT position
  74. GRB050826: Swift-BAT detection of a long burst
  75. GRB050824: MASTER final analysis of the OT observations
  76. Possible GRB050825:MASTER optical observations
  77. Swift-BAT trigger 152038 is definitely not a GRB
  78. Swift-BAT trigger 152038 is probably not a GRB
  79. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  80. GRB050824, I-band imaging
  81. GRB050824: Radio Observations
  82. GRB 050824: Spectroscopic redshift from the VLT
  83. GRB 050822: refined XRT analysis
  84. GRB 050824: XRT refined analysis and possible afterglow detection
  85. GRB 050824: BAT refined analysis of a soft weak burst
  86. GRB050824: MASTER:OT decay
  87. GRB050824: MASTER observation OT
  88. GRB050805a: MASTER optical candidat
  89. GRB 050824: ROTSE-III Optical Limits
  90. GRB050824: Swift-BAT detection of a burst
  91. GRB 050824 optical candidate
  92. GRB050820A: RTT150 optical observations
  93. GRB050820a: PROMPT RcIc Observations
  94. GRB050815: Maidanak optical observation
  95. XRF050509c: Radio upper limits from GMRT
  96. VLT/UVES spectroscopy of GRB050820
  97. GRB 050820A BAT observations of second, larger episode of emission
  98. GRB050813: Maidanak I-band observations
  99. GRB 050822: Swift-BAT refined analysis
  100. GRB050525, GRB050607, GRB050802 BVRcIc field photometry

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