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"

36348 results found.

  1. GRB050824: Maidanak optical limits
  2. GRB050820A: RTT150 optical observations
  3. GRB050827: RTT150 optical observations
  4. GRB 050827: Swift-BAT refined analysis
  5. GRB 050826: Optical Candidate
  6. GRB050824, HETE-2 Observation
  7. GRB 050826: Swift XRT preliminary analysis results
  8. GRB 050826: BAT refined analysis
  9. GRB050824: First 2 hours of power low optical decay?
  10. GRB 050826: Swift XRT position
  11. GRB050826: Swift-BAT detection of a long burst
  12. GRB050824: MASTER final analysis of the OT observations
  13. Possible GRB050825:MASTER optical observations
  14. Swift-BAT trigger 152038 is definitely not a GRB
  15. Swift-BAT trigger 152038 is probably not a GRB
  16. GRB050824: decay of the XRT light curve and updated X-ray spectrum
  17. GRB050824, I-band imaging
  18. GRB050824: Radio Observations
  19. GRB 050824: Spectroscopic redshift from the VLT
  20. GRB 050822: refined XRT analysis
  21. GRB 050824: XRT refined analysis and possible afterglow detection
  22. GRB 050824: BAT refined analysis of a soft weak burst
  23. GRB050824: MASTER:OT decay
  24. GRB050824: MASTER observation OT
  25. GRB050805a: MASTER optical candidat
  26. GRB 050824: ROTSE-III Optical Limits
  27. GRB050824: Swift-BAT detection of a burst
  28. GRB 050824 optical candidate
  29. GRB050820A: RTT150 optical observations
  30. GRB050820a: PROMPT RcIc Observations
  31. GRB050815: Maidanak optical observation
  32. XRF050509c: Radio upper limits from GMRT
  33. VLT/UVES spectroscopy of GRB050820
  34. GRB 050820A BAT observations of second, larger episode of emission
  35. GRB050813: Maidanak I-band observations
  36. GRB 050822: Swift-BAT refined analysis
  37. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  38. GRB050820B at FRAM
  39. GRB050820A: RTT150 optical observations
  40. GRB 050820a - corrections to GCN 3846
  41. Swift/UVOT UV Photometry of GRB 050820B
  42. GRB 050822: ROTSE-III Prompt Optical Limits
  43. GRB 050822: Swift detection of a long burst
  44. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  45. GRB050820A: Radio Observation
  46. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  47. GRB050820a BVRcIc field photometry
  48. GRB 050820a: NIR Observations by WIRO
  49. GRB 050820B: Swift XRT position
  50. GRB050820B: Refined analysis of the Swift-BAT burst
  51. GRB050820B: BAT-Swift detection of a bright GRB
  52. GRB050820: refined XRT analysis
  53. GRB 050820: Early RAPTOR detections
  54. GRB 050820 Swift-BAT refined analysis
  55. GRB 050820: P60 Temporal Decay Index
  56. GRB 050820: High Resolution Spectroscopy from Keck
  57. GRB050819: RTT150 optical observations
  58. GRB 050820: Swift detection of a GRB
  59. GRB 050819 Swift-BAT refined analysis
  60. GRB050819: Swift XRT position
  61. GRB050819: Swift-BAT detection of a weak burst
  62. Swift-BAT trigger 150993 is not a GRB
  63. Swift Trigger 150823 is HETE J1900.1-2455
  64. GRB 050817: Optical observations
  65. GRB 050815: Radio Observation
  66. GRB050814: Radio Observation
  67. GRB050817: Negative Optical Observations
  68. GRB 050814: continued fading
  69. GRB 050813: Radio Observations
  70. GRB050815: Refined analysis of the Swift-BAT burst
  71. GRB 050815: ROTSE-III Optical Limits
  72. GRB050815: Swift XRT afterglow localization
  73. GRB 050730: Third Epoch WSRT Radio Observations
  74. GRB050814: Fading red source
  75. GRB 050813: Gemini Spectra Revisited
  76. GRB 050813: Non-fading of afterglow candidate
  77. GRB 050814: XRT refined analysis
  78. GRB050814: Refined analysis of the Swift-BAT burst
  79. GRB050813: Gemini Imaging
  80. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  81. GRB 050814: Swift XRT Afterglow Localization
  82. GRB 050814: Swift detection of a burst
  83. GRB 050813: Magellan detection of a high redshift galaxy cluster
  84. GRB050813: RTT150 optical observations
  85. GRB 050813: I-band observations
  86. GRB050813, SDSS pre-burst observations
  87. GRB 050813: KAIT optical limit
  88. GRB 050813: Swift-BAT refined analysis
  89. GRB 050813: Photometry of object in XRT error circle
  90. GRB 050813: Swift XRT afterglow localization
  91. RBO GRB 050714A and GRB 050716 observations
  92. GRB 050813: Possible Short Swift-BAT GRB
  93. Swift-BAT trigger 150131 is not a GRB
  94. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  95. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  96. GRB050803: CrAO optical observations, no OT candidate
  97. GRB 050730: WSRT Radio Observations
  98. GRB 050803: PROMPT BVRcIc Observations
  99. GRB 050807: ROTSE-III Optical Limits
  100. GRB 050730, optical observation

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