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"

23707 results found.

  1. GRB 050904: TAROT optical limits
  2. GRB050904: Swift-BAT detection of a probable burst
  3. GRB 050827: Swift XRT preliminary analysis results
  4. GRB 050827 : OSN 1.5m optical observations
  5. GRB050827: Swift/UVOT upper limits
  6. GRB 050827: XRT possible afterglow detection
  7. GRB 050826 : Lulin R band observation
  8. GRB050824: Maidanak optical limits
  9. GRB050820A: RTT150 optical observations
  10. GRB050827: RTT150 optical observations
  11. GRB 050827: Swift-BAT refined analysis
  12. GRB050827: Swift-BAT detection of a burst
  13. Subaru Observations of GRB050724
  14. GRB 050826: Optical Candidate
  15. GRB050824, HETE-2 Observation
  16. GRB 050826: Swift XRT preliminary analysis results
  17. GRB050826: Swift/UVOT early upper limits
  18. GRB050824: First 2 hours of power low optical decay?
  19. GRB050824: MASTER final analysis of the OT observations
  20. Possible GRB050825:MASTER optical observations
  21. GRB050824: CORRECTION to UVOT observing times
  22. GRB050824: Swift/UVOT detection of fading afterglow
  23. GRB 050824: Spectroscopic redshift from the VLT
  24. GRB 050822: refined XRT analysis
  25. GRB050824: MASTER:OT decay
  26. GRB050824: MASTER observation OT
  27. GRB050805a: MASTER optical candidat
  28. GRB050824: Swift-BAT detection of a burst
  29. GRB 050824 optical candidate
  30. GRB050820A: RTT150 optical observations
  31. GRB050820a: PROMPT RcIc Observations
  32. GRB050815: Maidanak optical observation
  33. VLT/UVES spectroscopy of GRB050820
  34. GRB050822: Swift/UVOT upper limits
  35. GRB 050820A BAT observations of second, larger episode of emission
  36. GRB050813: Maidanak I-band observations
  37. GRB 050822: Swift-BAT refined analysis
  38. GRB050525, GRB050607, GRB050802 BVRcIc field photometry
  39. GRB050820A: RTT150 optical observations
  40. Swift/UVOT UV Photometry of GRB 050820B
  41. GRB 050822: Swift detection of a long burst
  42. GRB050820a BVRcIc field photometry
  43. GRB050820B: Refined analysis of the Swift-BAT burst
  44. GRB050820B: BAT-Swift detection of a bright GRB
  45. Swift/UVOT photometry of GRB050820
  46. GRB050820: refined XRT analysis
  47. GRB 050820 Swift-BAT refined analysis
  48. GRB050819: refined XRT analysis
  49. GRB050819: RTT150 optical observations
  50. GRB 050820: Swift detection of a GRB
  51. GRB050819: Swift-BAT detection of a weak burst
  52. Swift Trigger 150823 is HETE J1900.1-2455
  53. GRB 050817: Optical observations
  54. GRB050815: Optical afterglow detection by Swift UVOT
  55. GRB050815: Refined analysis of the Swift-BAT burst
  56. GRB 050813: Gemini Spectra Revisited
  57. GRB050814: SWIFT/UVOT observation
  58. GRB050814: Refined analysis of the Swift-BAT burst
  59. GRB050813: Gemini Imaging
  60. GRB 050813: Gemini spectroscopy and redshifts of galaxies B and C
  61. GRB 050813: Magellan detection of a high redshift galaxy cluster
  62. GRB050813: RTT150 optical observations
  63. GRB 050813: I-band observations
  64. GRB050813, SDSS pre-burst observations
  65. GRB 050813: KAIT optical limit
  66. GRB 050813: Swift-BAT refined analysis
  67. GRB050813: SWIFT/UVOT observation
  68. GRB050813 (Swift 150139): P60 Observations
  69. GRB050807(=H3889): An X-Ray Rich GRB Localized by HETE
  70. GRB050803: CrAO optical observations, no OT candidate
  71. Detection of an intermediate burst from SGR 1806-20 on August 8
  72. GRB050805b: CrAO optical limit
  73. GRB050730, optical observations
  74. GRB050803, optical observations
  75. Swift-BAT trigger 149118 is very likely not a GRB
  76. GRB 050805b: OHP optical limits
  77. GRB 050805b: TAROT optical limits
  78. Possible GRB 050805B: Swift-BAT trigger 149131 may be a burst
  79. Swift-BAT trigger 149118 is probably not a GRB
  80. GRB050802: TNG optical observations
  81. GRB 050803: RTT150 optical observations
  82. GRB050803: CrAO optical observations, possible OT candidate
  83. GRB 050803: Swift-BAT refined analysis
  84. GRB050803: MASTER further analys
  85. GRB 050803: Magellan Observations
  86. GRB 050803: early Swift XRT analysis results
  87. GRB 050803: TAROT optical limits
  88. GRB050803: MASTER optical observations
  89. GRB050803: Swift-BAT detection of a very long burst
  90. GCN GRB observation 050713A
  91. GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy
  92. GRB 050802: Swift/UVOT optical and UV detections
  93. GRB050802: CrAO optical observations
  94. GRB050801: Unchanged decay slope
  95. GRB 050730: OHP optical observations
  96. GRB 050802: early Swift XRT analysis results
  97. GRB 050802: Swift/UVOT observations
  98. GRB 050802: Swift-BAT refined analysis
  99. GRB050801: Optical photometry and decay index
  100. GRB 050802: Swift Gamma-ray Burst

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