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"

32721 results found.

  1. Update on Swift-BAT GRB 050528 (Trigger 130679)
  2. GRB050528: BOOTES optical candidate (retraction)
  3. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  4. GRB050525a: Radio Observations
  5. GRB 050509b: refined XRT/Chandra afterglow position analysis
  6. GRB050525a: optical upper limits
  7. GRB 050525a: SARA Observations
  8. GRB 050525B: Swift-BAT observations
  9. GRB 050525: MITSuME Optical Observation in VRI
  10. GRB 050525a: MDM Observations
  11. GRB050525A,optical observation
  12. GRB 050525 : Lulin optical afterglow observations
  13. GRB050525: Super-LOTIS observations
  14. GRB 050525, spectral lag pseudo-redshift
  15. GRB 050525a: Gemini/GMOS Spectra
  16. GRB050306: optical afterglow not confirmed
  17. GRB 050525: BART optical observation
  18. GRB 050525A: BOOTES simultaneous optical observations
  19. GRB 050525A: Swift-BAT refined analysis
  20. GRB050525: Optical observations
  21. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  22. Swift/UVOT UV and optical detections of GRB 050525
  23. Konus-Wind observation of GRB 050525
  24. GRB 050525: TAROT observations of the early afterglow
  25. INTEGRAL detection of GRB 050525
  26. GRB 050525, infrared observations
  27. GRB 050525: Optical observation
  28. GRB 050525: observatons of the optical afterglow
  29. GRB050525: ROTSE-III Refined Analysis
  30. GRB 050525 - Very Bright, Not Short
  31. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  32. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  33. XRF050522: NIR observations of XRT candidate
  34. XRF 050522: Swift XRT refined analysis
  35. XRF050522: Radio Observations
  36. Swift/UVOT observation of XRF 050522
  37. GRB 050509A: Further I-band imaging
  38. XRF 050522: Continued NIR P200 Monitoring
  39. RBO Observations of GRB050522
  40. GRB050520: Radio Observations
  41. XRF 050522: Swift XRT observation
  42. XRF050522, BVRcIc field photometry
  43. XRF 050522 : Lulin observations
  44. XRF050522: Optical Observations
  45. XRF050522: Near-infrared Observations
  46. XRF 050522: KAIT observations
  47. GRB 050520: VLT/ULTRACAM observations
  48. Swift UVOT Observations of GRB 050520
  49. GRB 050520: Swift XRT refined analysis
  50. XRF050509C: Chandra Afterglow Detection
  51. XRF 050509c: Swift XRT Upper Limit
  52. XRF050509c: Radio Observations
  53. RBO Observations of GRB050520
  54. GRB 050520: P200 Observations
  55. GRB050520: Liverpool Telescope follow-up
  56. GRB 050520: TAROT optical limit
  57. GRB 050520: Swift XRT position
  58. GRB 050520: VLT/ULTRACAM observations
  59. GRB 050520: OSN optical observations
  60. No Swift-BAT Lightcurves in real-time for next 3 weeks
  61. Swift-BAT trigger 122203 is not a real GRB
  62. XRF 050509C: REM NIR and Optical refined analysis
  63. GRB 050504: Swift XRT afterglow candidate has faded
  64. XRF 050509c optical afterglow
  65. GRB 050509B and short GRB-SN association? (corrected)
  66. GRB 050509B and short GRB-SN association?
  67. GRB 050509B: Subaru Optical Observations
  68. GRB050502b: Early Observation
  69. GRB050509b, Bok telescope B-band imaging
  70. Refined Chandra analysis of GRB 050509b
  71. GRB050509b, SDSS pre-burst observations
  72. GRB 050509b: Keck/Chandra Cross-Correlation
  73. Chandra observation of GRB 050509b
  74. GRB 050509b: RAPTOR deep, early limits.
  75. GRB050509B: Optical/Infared observations
  76. GRB 050509b: Swift/UVOT follow-up measurements
  77. GRB 050509b Milagro GeV/TeV Observations
  78. GRB050509B: Optical observations at the Very Large Telescope
  79. GRB 050509b: No Optical Variability in XRT Error Circle
  80. GRB050416: Afterglow detection at 188 nm with Swift UVOT
  81. GRB 050509a: Swift-BAT refined analysis
  82. GRB 050509c: ROTSE-III Optical Limits
  83. GRB 050509B: WSRT Radio Observations
  84. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  85. GRB 050505, early TAROT observation
  86. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  87. GRB 050509b: Further Analysis of Keck LRIS Images
  88. GRB 050509b: Physical Properties of the Candidate Host galaxy
  89. GRB 050505: SARA Observations
  90. Swift UVOT Follow-up Observations of GRB 050509B
  91. GRB 050509B, Optical Observations
  92. GRB 050509B: Swift/XRT refined analysis
  93. GRB050509a: Swift UVOT observations
  94. GRB 050509b: Optical observations
  95. GRB 050509b: Precision Astrometry
  96. GRB 050509b: Possible Optical Counterpart
  97. GRB 050509A: Optical observations
  98. GRB 050509b: Optical Counterpart Candidate
  99. GRB050509b: Radio Observations
  100. GRB 050509b: Swift-BAT refined analysis of the short hard 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