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"

32710 results found.

  1. GRB 050525 : Lulin optical afterglow observations
  2. GRB050525: Super-LOTIS observations
  3. GRB 050525, spectral lag pseudo-redshift
  4. GRB 050525a: Gemini/GMOS Spectra
  5. GRB050306: optical afterglow not confirmed
  6. GRB 050525: BART optical observation
  7. GRB 050525A: BOOTES simultaneous optical observations
  8. GRB 050525A: Swift-BAT refined analysis
  9. GRB050525: Optical observations
  10. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  11. Swift/UVOT UV and optical detections of GRB 050525
  12. Konus-Wind observation of GRB 050525
  13. GRB 050525: TAROT observations of the early afterglow
  14. INTEGRAL detection of GRB 050525
  15. GRB 050525, infrared observations
  16. GRB 050525: Optical observation
  17. GRB 050525: observatons of the optical afterglow
  18. GRB050525: ROTSE-III Refined Analysis
  19. GRB 050525 - Very Bright, Not Short
  20. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  21. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  22. XRF050522: NIR observations of XRT candidate
  23. XRF 050522: Swift XRT refined analysis
  24. XRF050522: Radio Observations
  25. Swift/UVOT observation of XRF 050522
  26. GRB 050509A: Further I-band imaging
  27. XRF 050522: Continued NIR P200 Monitoring
  28. RBO Observations of GRB050522
  29. GRB050520: Radio Observations
  30. XRF 050522: Swift XRT observation
  31. XRF050522, BVRcIc field photometry
  32. XRF 050522 : Lulin observations
  33. XRF050522: Optical Observations
  34. XRF050522: Near-infrared Observations
  35. XRF 050522: KAIT observations
  36. GRB 050520: VLT/ULTRACAM observations
  37. Swift UVOT Observations of GRB 050520
  38. GRB 050520: Swift XRT refined analysis
  39. XRF050509C: Chandra Afterglow Detection
  40. XRF 050509c: Swift XRT Upper Limit
  41. XRF050509c: Radio Observations
  42. RBO Observations of GRB050520
  43. GRB 050520: P200 Observations
  44. GRB050520: Liverpool Telescope follow-up
  45. GRB 050520: TAROT optical limit
  46. GRB 050520: Swift XRT position
  47. GRB 050520: VLT/ULTRACAM observations
  48. GRB 050520: OSN optical observations
  49. No Swift-BAT Lightcurves in real-time for next 3 weeks
  50. Swift-BAT trigger 122203 is not a real GRB
  51. XRF 050509C: REM NIR and Optical refined analysis
  52. GRB 050504: Swift XRT afterglow candidate has faded
  53. XRF 050509c optical afterglow
  54. GRB 050509B and short GRB-SN association? (corrected)
  55. GRB 050509B and short GRB-SN association?
  56. GRB 050509B: Subaru Optical Observations
  57. GRB050502b: Early Observation
  58. GRB050509b, Bok telescope B-band imaging
  59. Refined Chandra analysis of GRB 050509b
  60. GRB050509b, SDSS pre-burst observations
  61. GRB 050509b: Keck/Chandra Cross-Correlation
  62. Chandra observation of GRB 050509b
  63. GRB 050509b: RAPTOR deep, early limits.
  64. GRB050509B: Optical/Infared observations
  65. GRB 050509b: Swift/UVOT follow-up measurements
  66. GRB 050509b Milagro GeV/TeV Observations
  67. GRB050509B: Optical observations at the Very Large Telescope
  68. GRB 050509b: No Optical Variability in XRT Error Circle
  69. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  70. GRB 050509a: Swift-BAT refined analysis
  71. GRB 050509c: ROTSE-III Optical Limits
  72. GRB 050509B: WSRT Radio Observations
  73. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  74. GRB 050505, early TAROT observation
  75. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  76. GRB 050509b: Further Analysis of Keck LRIS Images
  77. GRB 050509b: Physical Properties of the Candidate Host galaxy
  78. GRB 050505: SARA Observations
  79. Swift UVOT Follow-up Observations of GRB 050509B
  80. GRB 050509B, Optical Observations
  81. GRB 050509B: Swift/XRT refined analysis
  82. GRB050509a: Swift UVOT observations
  83. GRB 050509b: Optical observations
  84. GRB 050509b: Precision Astrometry
  85. GRB 050509b: Possible Optical Counterpart
  86. GRB 050509A: Optical observations
  87. GRB 050509b: Optical Counterpart Candidate
  88. GRB050509b: Radio Observations
  89. GRB 050509b: Swift-BAT refined analysis of the short hard burst
  90. GRB 050509b: optical observations
  91. GRB 050509b: Swift XRT Position
  92. GRB 050509B: ROTSE-III Optical Limits
  93. GRB 050509a: Swift XRT Position
  94. GRB 050505: Keck I-band Magnitude
  95. GRB 050505: early time observations
  96. GRB 050502a: Swift XRT Upper Limit
  97. GRB 050505, simultaneous optical observation
  98. GRB050505: Infrared observations
  99. GRB 050505: Further Swift UVOT observations.
  100. GRB050505: AAVSO observations

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