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"

37976 results found.

  1. GRB 050904: BAT refined analysis of partial data set
  2. GRB 050904: TAROT optical measurements
  3. GRB050904: Optical Observations
  4. GRB 050904: Environmental Constraints
  5. GRB 050904: Possible High-Redshift GRB
  6. GRB 050904: SOAR/PROMPT Observations
  7. GRB050904: P60 Observations
  8. GRB 050904: TAROT optical limits
  9. GRB050904: Swift-BAT detection of a probable burst
  10. Swift-BAT triggers 153461-153465 are not GRBs
  11. Retraction of Swift-BAT trigger #153355
  12. GRB 050824: MDM Observations
  13. GRB 050827: Swift XRT preliminary analysis results
  14. IBAS Alerts 2641 and 2642: not a real GRB
  15. Swift Trigger #152652 is not a GRB
  16. GRB 050827 : OSN 1.5m optical observations
  17. GRB 050827: P200 NIR Observations
  18. GRB050827: Swift/UVOT upper limits
  19. GRB 050827: Optical Limit
  20. GRB 050827: XRT possible afterglow detection
  21. GRB 050826 : Lulin R band observation
  22. GRB050824: Maidanak optical limits
  23. GRB050820A: RTT150 optical observations
  24. GRB050827: RTT150 optical observations
  25. GRB 050827: Swift-BAT refined analysis
  26. GRB050827: Swift-BAT detection of a burst
  27. GRB 050826: Optical Candidate
  28. GRB050824, HETE-2 Observation
  29. GRB 050826: Swift XRT preliminary analysis results
  30. GRB 050826: BAT refined analysis
  31. GRB050826: Swift/UVOT early upper limits
  32. GRB050824: First 2 hours of power low optical decay?
  33. GRB 050826: Swift XRT position
  34. GRB050826: Swift-BAT detection of a long burst
  35. GRB050824: MASTER final analysis of the OT observations
  36. Possible GRB050825:MASTER optical observations
  37. Swift-BAT trigger 152038 is definitely not a GRB
  38. GRB050824: CORRECTION to UVOT observing times
  39. Swift-BAT trigger 152038 is probably not a GRB
  40. GRB050824: Swift/UVOT detection of fading afterglow
  41. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  42. GRB050824, I-band imaging
  43. GRB050824: Radio Observations
  44. GRB 050824: Spectroscopic redshift from the VLT
  45. GRB 050822: refined XRT analysis
  46. GRB 050824: XRT refined analysis and possible afterglow detection
  47. GRB 050824: BAT refined analysis of a soft weak burst
  48. GRB050824: MASTER:OT decay
  49. GRB050824: MASTER observation OT
  50. GRB050805a: MASTER optical candidat
  51. GRB 050824: ROTSE-III Optical Limits
  52. GRB050824: Swift-BAT detection of a burst
  53. GRB 050824 optical candidate
  54. GRB050820A: RTT150 optical observations
  55. GRB050820a: PROMPT RcIc Observations
  56. GRB050815: Maidanak optical observation
  57. XRF050509c: Radio upper limits from GMRT
  58. VLT/UVES spectroscopy of GRB050820
  59. GRB050822: Swift/UVOT upper limits
  60. GRB 050820A BAT observations of second, larger episode of emission
  61. GRB050813: Maidanak I-band observations
  62. GRB 050822: Swift-BAT refined analysis
  63. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  64. GRB050820B at FRAM
  65. GRB050820A: RTT150 optical observations
  66. GRB 050820a - corrections to GCN 3846
  67. Swift/UVOT UV Photometry of GRB 050820B
  68. GRB 050822: ROTSE-III Prompt Optical Limits
  69. GRB 050822: Swift detection of a long burst
  70. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  71. GRB050820A: Radio Observation
  72. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  73. GRB050820a BVRcIc field photometry
  74. GRB050820B XMM-Newton observation
  75. GRB 050820a: NIR Observations by WIRO
  76. GRB 050820B: Swift XRT position
  77. GRB050820B: Refined analysis of the Swift-BAT burst
  78. GRB050820B: BAT-Swift detection of a bright GRB
  79. Swift/UVOT photometry of GRB050820
  80. GRB050820: refined XRT analysis
  81. GRB 050820: Early RAPTOR detections
  82. GRB 050820 Swift-BAT refined analysis
  83. GRB 050820: P60 Temporal Decay Index
  84. GRB 050820: High Resolution Spectroscopy from Keck
  85. GRB050819: refined XRT analysis
  86. GRB050819: RTT150 optical observations
  87. GRB 050820: Swift detection of a GRB
  88. GRB050820: Optical afterglow from P60
  89. GRB 050819 Swift-BAT refined analysis
  90. GRB050819: Swift XRT position
  91. GRB050819: Swift-BAT detection of a weak burst
  92. Swift-BAT trigger 150993 is not a GRB
  93. Swift Trigger 150823 is HETE J1900.1-2455
  94. GRB 050817: Optical observations
  95. GRB 050815: Radio Observation
  96. GRB050814: Radio Observation
  97. GRB050817: Negative Optical Observations
  98. GRB050817: Swift-BAT Detection of a burst
  99. GRB 050814: continued fading
  100. GRB050815: Optical afterglow detection by Swift UVOT

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