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"

26362 results found.

  1. GRB050603, submillimetre observations
  2. GRB050603: Radio Detection
  3. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  4. GRB 050603: INTEGRAL shows it is not a short GRB
  5. GRB 050525a, infrared observations
  6. GRB050528, XRT observations
  7. GRB050528: updated Liverpool Telescope limits
  8. Swift-BAT GRB 050528: a soft burst
  9. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  10. Possible GRB050528: no candidate from Liverpool Telescope
  11. GRB050525a: Radio Observations
  12. GRB 050509b: refined XRT/Chandra afterglow position analysis
  13. GRB 050525: RTT150, Optical observations
  14. GRB 050525a: SARA Observations
  15. GRB 050525B: Swift-BAT observations
  16. GRB 050525: MITSuME Optical Observation in VRI
  17. GRB050525A,optical observation
  18. GRB050525: Super-LOTIS observations
  19. GRB 050525, spectral lag pseudo-redshift
  20. GRB050306: optical afterglow not confirmed
  21. GRB 050525: BART optical observation
  22. GRB 050525A: BOOTES simultaneous optical observations
  23. GRB 050525A: Swift-BAT refined analysis
  24. GRB050525: Optical observations
  25. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  26. Konus-Wind observation of GRB 050525
  27. GRB 050525: TAROT observations of the early afterglow
  28. INTEGRAL detection of GRB 050525
  29. GRB 050525, infrared observations
  30. GRB 050525: observatons of the optical afterglow
  31. GRB050525: ROTSE-III Refined Analysis
  32. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  33. XRF050522: Radio Observations
  34. Swift/UVOT observation of XRF 050522
  35. GRB 050509A: Further I-band imaging
  36. GRB050522,optical observation
  37. GRB050520,optical observation
  38. XRF 050522: Continued NIR P200 Monitoring
  39. RBO Observations of GRB050522
  40. Recent GRB BVRcIc field photometry
  41. GRB050520: Radio Observations
  42. XRF 050522: Swift XRT observation
  43. XRF050522, BVRcIc field photometry
  44. XRF050522: Optical Observations
  45. XRF050522: Near-infrared Observations
  46. GRB 050520: VLT/ULTRACAM observations
  47. GRB 050520: Swift XRT refined analysis
  48. XRF050509C: Chandra Afterglow Detection
  49. XRF050509c: Radio Observations
  50. GRB 050520: P200 Observations
  51. GRB 050520: TAROT optical limit
  52. GRB 050520: VLT/ULTRACAM observations
  53. XRF 050509c optical afterglow
  54. GRB 050509B and short GRB-SN association? (corrected)
  55. GRB 050509B and short GRB-SN association?
  56. GRB050502b: Early Observation
  57. GRB050509b, Bok telescope B-band imaging
  58. Refined Chandra analysis of GRB 050509b
  59. GRB050509b, SDSS pre-burst observations
  60. GRB 050509b: Keck/Chandra Cross-Correlation
  61. GRB 050509b: Keck/Chandra Cross-Correlation
  62. Chandra observation of GRB 050509b
  63. GRB 050509b: RAPTOR deep, early limits.
  64. GRB050509B: Optical observations at the Very Large Telescope
  65. GRB 050509b: No Optical Variability in XRT Error Circle
  66. GRB 050509a: Swift-BAT refined analysis
  67. GRB 050509c: ROTSE-III Optical Limits
  68. GRB 050505, early TAROT observation
  69. GRB050509c: REM NIR and Optical observations
  70. GRB 050509b: Physical Properties of the Candidate Host galaxy
  71. GRB 050505: SARA Observations
  72. GRB 050509B, Optical Observations
  73. GRB 050509B: Swift/XRT refined analysis
  74. GRB 050509b: Optical observations
  75. GRB 050509A: Optical observations
  76. GRB050509b: Radio Observations
  77. GRB 050509b: PAIRITEL and WIYN Observations
  78. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  79. Swift Detection of GRB050509b: A short duration burst
  80. Swift Detection of the Burst GRB050509
  81. GRB 050505: early time observations
  82. GRB 050505, simultaneous optical observation
  83. GRB050505: AAVSO observations
  84. GRB050416A : 1 GHz limit from GMRT
  85. GRB050505: Optical Afterglow Candidate
  86. GRB050505 Swift-BAT refined analysis
  87. GRB 050416b:Swift XRT afterglow upper limits
  88. GRB 050416b:Swift XRT afterglow upper limits
  89. GRB050502b: Afterglow Confirmation: Correction to OT Coordinates
  90. GRB050502b: Afterglow Confirmation
  91. GRB050502: P200 Observations (Correction)
  92. GRB050502: P200 Observations
  93. GRB 050504 : R band observation at Lulin observatory
  94. Swift UVOT observation of GRB 050504
  95. GRB 050504, R band Observations
  96. GRB 050502b, V band Observations
  97. GRB050504: P60 Observations
  98. GRB 050504: A long GRB detected with INTEGRAL
  99. GRB (?) 050504: IR Observations, Intriguing Source
  100. GRB 050502b, Optical observations

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