Skip to main content
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. 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').

17175 results found.

  1. Swift trigger 143708 is really GRB 050701
  2. GRB 050525A: Swift Late-Time Decay Rate
  3. CORRECTION: GRB050603 Swift UVOT Afterglow Observations
  4. GRB 050416(a): Host Galaxy Redshift Determination
  5. Swift/UVOT observations of GRB050607
  6. GRB 050607: RAPTOR-S Early Optical Limits
  7. GRB050607: KAIT optical limits
  8. GRB 050607: MDM Observations
  9. GRB050607,optical observation
  10. GRB 050607 - XRT refined data analysis
  11. GRB050607 optical limit by "Pi of the Sky"
  12. GRB050607: Swift Detection of a long GRB
  13. GRB 050603 - XRT data analysis of the first day
  14. Konus-Wind observation of GRB 050603
  15. GRB 050603: Analysis of UVOT data
  16. GRB050603: Fading Afterglow observed by Swift UVOT
  17. GRB 050603: Swift XRT Position
  18. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  19. Swift/BAT Detection of GRB050603
  20. GRB 050408: jet break in the XRT light curve
  21. GRB050528, XRT observations
  22. Correction to GCN Circ 3502 on GRB 050528
  23. Swift-BAT GRB 050528: a soft burst
  24. Update on Swift-BAT GRB 050528 (Trigger 130679)
  25. Possible GRB050528: no candidate from Liverpool Telescope
  26. Swift-BAT detection of possible GRB 050528
  27. GRB 050509b: refined XRT/Chandra afterglow position analysis
  28. GRB050525a: optical upper limits
  29. GRB 050525B: Swift-BAT observations
  30. GRB050525A,optical observation
  31. GRB050525: Super-LOTIS observations
  32. GRB 050525, spectral lag pseudo-redshift
  33. GRB050306: optical afterglow not confirmed
  34. GRB 050525A: BOOTES simultaneous optical observations
  35. GRB 050525A: Swift-BAT refined analysis
  36. Swift/UVOT UV and optical detections of GRB 050525
  37. Konus-Wind observation of GRB 050525
  38. GRB 050525: TAROT observations of the early afterglow
  39. INTEGRAL detection of GRB 050525
  40. GRB 050525: Optical observation
  41. GRB050525: ROTSE-III Refined Analysis
  42. GRB 050525 - Very Bright, Not Short
  43. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  44. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  45. XRF 050522: Swift XRT refined analysis
  46. Swift/UVOT observation of XRF 050522
  47. GRB 050509A: Further I-band imaging
  48. RBO Observations of GRB050522
  49. XRF 050522: Swift XRT observation
  50. GRB 050520: VLT/ULTRACAM observations
  51. Swift UVOT Observations of GRB 050520
  52. GRB 050520: Swift XRT refined analysis
  53. XRF050509C: Chandra Afterglow Detection
  54. XRF 050509c: Swift XRT Upper Limit
  55. RBO Observations of GRB050520
  56. GRB 050520: TAROT optical limit
  57. GRB 050520: Swift XRT position
  58. No Swift-BAT Lightcurves in real-time for next 3 weeks
  59. Swift-BAT trigger 122203 is not a real GRB
  60. GRB 050504: Swift XRT afterglow candidate has faded
  61. GRB 050509B: Subaru Optical Observations
  62. GRB050502b: Early Observation
  63. Refined Chandra analysis of GRB 050509b
  64. GRB050509b, SDSS pre-burst observations
  65. Chandra observation of GRB 050509b
  66. GRB 050509b: RAPTOR deep, early limits.
  67. GRB050509B: Optical/Infared observations
  68. GRB 050509b: Swift/UVOT follow-up measurements
  69. GRB 050509b Milagro GeV/TeV Observations
  70. GRB050509B: Optical observations at the Very Large Telescope
  71. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  72. GRB 050509a: Swift-BAT refined analysis
  73. GRB 050509B: WSRT Radio Observations
  74. GRB 050505: SARA Observations
  75. Swift UVOT Follow-up Observations of GRB 050509B
  76. GRB 050509B, Optical Observations
  77. GRB 050509B: Swift/XRT refined analysis
  78. GRB050509a: Swift UVOT observations
  79. GRB 050509b: Optical observations
  80. GRB 050509b: Possible Optical Counterpart
  81. GRB 050509A: Optical observations
  82. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  83. GRB 050509b: optical observations
  84. GRB 050509b: Swift XRT Position
  85. GRB 050509B: ROTSE-III Optical Limits
  86. Swift Detection of GRB050509b: A short duration burst
  87. GRB 050509a: Swift XRT Position
  88. Swift Detection of the Burst GRB050509
  89. Swift-BAT detection of GRB 050507
  90. GRB 050505: early time observations
  91. GRB 050505 - Faulkes Telescope North observations
  92. GRB 050502a: Swift XRT Upper Limit
  93. GRB 050505, simultaneous optical observation
  94. GRB 050505: Further Swift UVOT observations.
  95. GRB050416A : 1 GHz limit from GMRT
  96. GRB 050505 UVOT
  97. GRB 050505: Swift XRT Position
  98. GRB050505 Swift-BAT refined analysis
  99. GRB 050416b:Swift XRT afterglow upper limits
  100. GRB 050416b:Swift XRT afterglow upper limits

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