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"

32719 results found.

  1. GRB 050824: ROTSE-III Optical Limits
  2. GRB050820A: RTT150 optical observations
  3. GRB050820a: PROMPT RcIc Observations
  4. GRB050815: Maidanak optical observation
  5. XRF050509c: Radio upper limits from GMRT
  6. VLT/UVES spectroscopy of GRB050820
  7. GRB050822: Swift/UVOT upper limits
  8. GRB 050820A BAT observations of second, larger episode of emission
  9. GRB050813: Maidanak I-band observations
  10. GRB 050822: Swift-BAT refined analysis
  11. GRB050820A: RTT150 optical observations
  12. GRB 050820a - corrections to GCN 3846
  13. Swift/UVOT UV Photometry of GRB 050820B
  14. GRB 050822: ROTSE-III Prompt Optical Limits
  15. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  16. GRB050820A: Radio Observation
  17. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  18. GRB050820a BVRcIc field photometry
  19. GRB 050820a: NIR Observations by WIRO
  20. GRB 050820B: Swift XRT position
  21. GRB050820B: Refined analysis of the Swift-BAT burst
  22. Swift/UVOT photometry of GRB050820
  23. GRB050820: refined XRT analysis
  24. GRB 050820: Early RAPTOR detections
  25. GRB 050820 Swift-BAT refined analysis
  26. GRB 050820: P60 Temporal Decay Index
  27. GRB 050820: High Resolution Spectroscopy from Keck
  28. GRB050819: refined XRT analysis
  29. GRB050819: RTT150 optical observations
  30. GRB 050820: Swift detection of a GRB
  31. GRB 050819 Swift-BAT refined analysis
  32. GRB050819: Swift XRT position
  33. Swift-BAT trigger 150993 is not a GRB
  34. Swift Trigger 150823 is HETE J1900.1-2455
  35. GRB 050817: Optical observations
  36. GRB 050815: Radio Observation
  37. GRB050814: Radio Observation
  38. GRB050817: Negative Optical Observations
  39. GRB 050814: continued fading
  40. GRB050815: XRT refined analysis
  41. GRB 050813: Radio Observations
  42. GRB050815: Refined analysis of the Swift-BAT burst
  43. GRB 050815: ROTSE-III Optical Limits
  44. GRB050815: Swift XRT afterglow localization
  45. GRB 050730: Third Epoch WSRT Radio Observations
  46. GRB050814: Fading red source
  47. GRB 050813: Gemini Spectra Revisited
  48. GRB050814: P60 Optical Afterglow Candidate
  49. GRB 050813: Non-fading of afterglow candidate
  50. GRB 050814: XRT refined analysis
  51. GRB050814: SWIFT/UVOT observation
  52. GRB050814: Refined analysis of the Swift-BAT burst
  53. GRB050813: Gemini Imaging
  54. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  55. GRB 050814: Swift XRT Afterglow Localization
  56. GRB 050814: Swift detection of a burst
  57. GRB 050813: Magellan detection of a high redshift galaxy cluster
  58. GRB050813: RTT150 optical observations
  59. GRB 050813: I-band observations
  60. GRB050813, SDSS pre-burst observations
  61. GRB 050813: KAIT optical limit
  62. GRB 050813: Swift-BAT refined analysis
  63. GRB 050813: Photometry of object in XRT error circle
  64. GRB050813: SWIFT/UVOT observation
  65. GRB 050813: Swift XRT afterglow localization
  66. RBO GRB 050714A and GRB 050716 observations
  67. Swift-BAT trigger 150131 is not a GRB
  68. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  69. GRB050803: CrAO optical observations, no OT candidate
  70. GRB 050730: WSRT Radio Observations
  71. GRB 050803: PROMPT BVRcIc Observations
  72. GRB 050807: ROTSE-III Optical Limits
  73. GRB 050730, optical observation
  74. GRB050805a : Null detection report
  75. GRB050730, optical observations
  76. GRB050803, optical observations
  77. GRB 050805b: TAROT optical limits
  78. GRB050802: TNG optical observations
  79. GRB050803: Radio Observation
  80. GRB 050803: RTT150 optical observations
  81. GRB050801: Radio Observation
  82. GRB050730: Radio Detection
  83. GRB050803: CrAO optical observations, possible OT candidate
  84. GRB050803: Optical/UV Upper Limits from Swift-UVOT
  85. GRB 050803: Keck Observations
  86. GRB 050803: Swift-BAT refined analysis
  87. GRB 050802.422: Fading of the afterglow and detection of the host
  88. GRB050803: MASTER further analys
  89. GRB 050803, optical observations
  90. GRB 050803: Magellan Observations
  91. GRB 050803: early Swift XRT analysis results
  92. GRB050802: Tentative absorption redshift
  93. GCN GRB observation 050713A
  94. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  95. GRB 050802: Swift/UVOT optical and UV detections
  96. GRB050802: CrAO optical observations
  97. GRB050801: Unchanged decay slope
  98. GRB050802 radio non-detection
  99. GRB 050802: early Swift XRT analysis results
  100. GRB 050802: Swift/UVOT 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