Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

18477 results found.

  1. GRB 050607: MDM Observation
  2. GRB 050607 optical decay
  3. GRB050607: refined analysis of prompt REM observations
  4. GRB 050607 : Lulin R-band observation
  5. GRB 050525a, Mid-Infrared Observations
  6. GRB 050607: Optical decay and spectral slope
  7. GRB050607,optical observation
  8. Optical Afterglow of GRB 050607
  9. GRB050607 optical limit by "Pi of the Sky"
  10. GRB050607: Swift Detection of a long GRB
  11. GRB050607: prompt REM observations
  12. Limits on a SN in the field of GRB 050509b
  13. GRB050603, submillimetre observations
  14. GRB 050603: Swift XRT Position
  15. GRB050603: Radio Detection
  16. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  17. GRB 050603: INTEGRAL shows it is not a short GRB
  18. Swift/BAT Detection of GRB050603
  19. GRB 050525a, infrared observations
  20. GRB050528: updated Liverpool Telescope limits
  21. Swift-BAT GRB 050528: a soft burst
  22. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  23. Possible GRB050528: no candidate from Liverpool Telescope
  24. GRB050525a: Radio Observations
  25. GRB 050509b: refined XRT/Chandra afterglow position analysis
  26. GRB 050525: RTT150, Optical observations
  27. GRB 050525a: SARA Observations
  28. GRB 050525B: Swift-BAT observations
  29. GRB 050525: MITSuME Optical Observation in VRI
  30. GRB050525A,optical observation
  31. GRB050525: Super-LOTIS observations
  32. GRB050306: optical afterglow not confirmed
  33. GRB 050525: BART optical observation
  34. GRB 050525A: BOOTES simultaneous optical observations
  35. GRB050525: Optical observations
  36. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  37. GRB 050525: TAROT observations of the early afterglow
  38. INTEGRAL detection of GRB 050525
  39. GRB 050525, infrared observations
  40. GRB 050525: Optical observation
  41. GRB 050525: observatons of the optical afterglow
  42. GRB050525: ROTSE-III Refined Analysis
  43. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  44. XRF050522: Radio Observations
  45. Swift/UVOT observation of XRF 050522
  46. GRB 050509A: Further I-band imaging
  47. GRB050522,optical observation
  48. GRB050520,optical observation
  49. XRF 050522: Continued NIR P200 Monitoring
  50. RBO Observations of GRB050522
  51. Recent GRB BVRcIc field photometry
  52. GRB050520: Radio Observations
  53. XRF 050522: Swift XRT observation
  54. XRF050522, BVRcIc field photometry
  55. XRF050522: Optical Observations
  56. XRF050522: Near-infrared Observations
  57. GRB 050520: VLT/ULTRACAM observations
  58. Swift UVOT Observations of GRB 050520
  59. XRF050509c: Radio Observations
  60. RBO Observations of GRB050520
  61. GRB 050520: P200 Observations
  62. GRB050520: Liverpool Telescope follow-up
  63. RBO Observations of GRB050520
  64. GRB 050520: TAROT optical limit
  65. GRB 050520: VLT/ULTRACAM observations
  66. GRB050502b: Early Observation
  67. GRB050509b, Bok telescope B-band imaging
  68. GRB050509b, SDSS pre-burst observations
  69. GRB 050509b: Keck/Chandra Cross-Correlation
  70. GRB 050509b: Keck/Chandra Cross-Correlation
  71. Chandra observation of GRB 050509b
  72. GRB 050509b Milagro GeV/TeV Observations
  73. GRB050509B: Optical observations at the Very Large Telescope
  74. GRB 050509b: No Optical Variability in XRT Error Circle
  75. GRB 050509c: ROTSE-III Optical Limits
  76. GRB 050505, early TAROT observation
  77. GRB050509c: REM NIR and Optical observations
  78. GRB 050505: SARA Observations
  79. GRB 050509B: Swift/XRT refined analysis
  80. GRB 050509A: Optical observations
  81. GRB050509b: Radio Observations
  82. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  83. Swift Detection of GRB050509b: A short duration burst
  84. Swift Detection of the Burst GRB050509
  85. GRB 050505, simultaneous optical observation
  86. GRB050505: AAVSO observations
  87. GRB050416A : 1 GHz limit from GMRT
  88. GRB050505: Optical Afterglow Candidate
  89. GRB 050416b:Swift XRT afterglow upper limits
  90. GRB 050416b:Swift XRT afterglow upper limits
  91. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  92. GRB050502b: Afterglow Confirmation
  93. GRB050502: P200 Observations (Correction)
  94. GRB050502: P200 Observations
  95. Swift UVOT observation of GRB 050504
  96. GRB050504: P60 Observations
  97. GRB 050504: A long GRB detected with INTEGRAL
  98. GRB (?) 050504: IR Observations, Intriguing Source
  99. GRB 050502b, Optical observations
  100. GRB050502a: P60 Observations (Correction)

Advanced

Download all Circulars as a .tar.gz archive:
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