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"

32720 results found.

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

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