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"

36116 results found.

  1. GRB050824: Swift-BAT detection of a burst
  2. GRB 050824 optical candidate
  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. GRB 050820A BAT observations of second, larger episode of emission
  9. GRB050813: Maidanak I-band observations
  10. GRB 050822: Swift-BAT refined analysis
  11. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  12. GRB050820B at FRAM
  13. GRB050820A: RTT150 optical observations
  14. GRB 050820a - corrections to GCN 3846
  15. Swift/UVOT UV Photometry of GRB 050820B
  16. GRB 050822: ROTSE-III Prompt Optical Limits
  17. GRB 050822: Swift detection of a long burst
  18. Correction to Eiso calculation in GCN 3835 on GRB 050820A
  19. GRB050820A: Radio Observation
  20. GRB050825a - very long GRB like GRB041219a? (Konus-Wind observation)
  21. GRB050820a BVRcIc field photometry
  22. GRB 050820a: NIR Observations by WIRO
  23. GRB 050820B: Swift XRT position
  24. GRB050820B: Refined analysis of the Swift-BAT burst
  25. GRB050820B: BAT-Swift detection of a bright GRB
  26. GRB050820: refined XRT analysis
  27. GRB 050820: Early RAPTOR detections
  28. GRB 050820 Swift-BAT refined analysis
  29. GRB 050820: P60 Temporal Decay Index
  30. GRB 050820: High Resolution Spectroscopy from Keck
  31. GRB050819: RTT150 optical observations
  32. GRB 050820: Swift detection of a GRB
  33. GRB 050819 Swift-BAT refined analysis
  34. GRB050819: Swift XRT position
  35. GRB050819: Swift-BAT detection of a weak burst
  36. Swift-BAT trigger 150993 is not a GRB
  37. Swift Trigger 150823 is HETE J1900.1-2455
  38. GRB 050817: Optical observations
  39. GRB 050815: Radio Observation
  40. GRB050814: Radio Observation
  41. GRB050817: Negative Optical Observations
  42. GRB 050814: continued fading
  43. GRB 050813: Radio Observations
  44. GRB050815: Refined analysis of the Swift-BAT burst
  45. GRB 050815: ROTSE-III Optical Limits
  46. GRB050815: Swift XRT afterglow localization
  47. GRB 050730: Third Epoch WSRT Radio Observations
  48. GRB050814: Fading red source
  49. GRB 050813: Gemini Spectra Revisited
  50. GRB 050813: Non-fading of afterglow candidate
  51. GRB 050814: XRT refined analysis
  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. GRB 050813: Swift XRT afterglow localization
  65. RBO GRB 050714A and GRB 050716 observations
  66. GRB 050813: Possible Short Swift-BAT GRB
  67. Swift-BAT trigger 150131 is not a GRB
  68. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  69. Ongoing activity of SGR 1806-20: an intermediate burst 050811
  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. GRB050805b: CrAO optical limit
  76. GRB050805a : Null detection report
  77. GRB050730, optical observations
  78. GRB050803, optical observations
  79. Swift-BAT trigger 149118 is very likely not a GRB
  80. Retraction of Swift Trigger 149131 (GRB 050805B)
  81. GRB 050805b: OHP optical limits
  82. GRB 050805b: TAROT optical limits
  83. GRB050805b: MASTER optical observations
  84. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  85. GRB050805a: MASTER optical candidat
  86. Swift-BAT trigger 149118 is probably not a GRB
  87. GRB 050803: RTT150 optical observations
  88. GRB050803: CrAO optical observations, possible OT candidate
  89. GRB 050803: Keck Observations
  90. GRB 050803: Swift-BAT refined analysis
  91. GRB 050802.422: Fading of the afterglow and detection of the host
  92. GRB050803: MASTER further analys
  93. GRB 050803, optical observations
  94. GRB 050803: Magellan Observations
  95. GRB 050803: early Swift XRT analysis results
  96. GRB 050803: TAROT optical limits
  97. GRB050803: MASTER optical observations
  98. GRB050802: Tentative absorption redshift
  99. GCN GRB observation 050713A
  100. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy

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