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"

36122 results found.

  1. GRB 050603: Swift-BAT refined analysis of a long three-spiked burst
  2. GRB 050603: Afterglow Identification from LCO
  3. GRB 050603: INTEGRAL shows it is not a short GRB
  4. GRB 050408: jet break in the XRT light curve
  5. GRB 050525a, infrared observations
  6. GRB 050525a, SMARTS optical/IR afterglow observations
  7. Correction to GCN Circ 3502 on GRB 050528
  8. GRB050528: updated Liverpool Telescope limits
  9. Swift-BAT GRB 050528: a soft burst
  10. Update on Swift-BAT GRB 050528 (Trigger 130679)
  11. GRB050528: BOOTES optical candidate (retraction)
  12. GRB050504: Ashra-P2/3 monitor and Ashra-AFT response
  13. GRB050528: BOOTES optical candidate
  14. Possible GRB050528: no candidate from Liverpool Telescope
  15. Swift-BAT detection of possible GRB 050528
  16. GRB050525a: Radio Observations
  17. GRB 050509b: refined XRT/Chandra afterglow position analysis
  18. GRB 050525: RTT150, Optical observations
  19. GRB050525a: optical upper limits
  20. GRB 050525a: SARA Observations
  21. GRB 050525B: Swift-BAT observations
  22. GRB 050525: MITSuME Optical Observation in VRI
  23. GRB 050525a: MDM Observations
  24. GRB050525A,optical observation
  25. GRB 050525 : Lulin optical afterglow observations
  26. GRB050525: Super-LOTIS observations
  27. GRB 050525, spectral lag pseudo-redshift
  28. GRB 050525a: Gemini/GMOS Spectra
  29. GRB050306: optical afterglow not confirmed
  30. GRB 050525: BART optical observation
  31. GRB 050525A: BOOTES simultaneous optical observations
  32. GRB 050525A: Swift-BAT refined analysis
  33. GRB050525: Optical observations
  34. GRB 050525B: INTEGRAL shows it is unrelated to GRB050525A
  35. GRB 050525: pseudo-redshift
  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, infrared observations
  41. GRB 050525: Optical observation
  42. GRB 050525: observatons of the optical afterglow
  43. GRB050525: ROTSE-III Refined Analysis
  44. GRB 050525 - Very Bright, Not Short
  45. GRB 050525: Swift Detection of a Bright, Possibly Short Burst
  46. GRB 050525A: ROTSE-III Detection of Possible Counterpart
  47. XRF050522: NIR observations of XRT candidate
  48. XRF050522: Radio Observations
  49. GRB 050509A: Further I-band imaging
  50. GRB050522,optical observation
  51. GRB050520,optical observation
  52. XRF 050522: Continued NIR P200 Monitoring
  53. RBO Observations of GRB050522
  54. GRB050509b: optical observations
  55. Recent GRB BVRcIc field photometry
  56. GRB050520: Radio Observations
  57. XRF050522, BVRcIc field photometry
  58. XRF050522: Optical Observations
  59. XRF 050522: KAIT observations
  60. XRF 050522 detected with INTEGRAL
  61. GRB 050520: VLT/ULTRACAM observations
  62. Swift UVOT Observations of GRB 050520
  63. GRB 050520: Swift XRT refined analysis
  64. RBO Observations of GRB050520
  65. GRB 050520: P200 Observations
  66. GRB050520: Liverpool Telescope follow-up
  67. GRB 050520: TAROT optical limit
  68. GRB 050520: Swift XRT position
  69. GRB 050520: VLT/ULTRACAM observations
  70. GRB 050520: OSN optical observations
  71. GRB 050520: BART optical limit
  72. GRB 050520 - A long GRB detected with INTEGRAL
  73. Swift-BAT trigger 122203 is not a real GRB
  74. GRB 050504: Swift XRT afterglow candidate has faded
  75. XRF 050509c optical afterglow
  76. GRB 050509B and short GRB-SN association? (corrected)
  77. GRB 050509B and short GRB-SN association?
  78. GRB 050509B: Subaru Optical Observations
  79. GRB050502b: Early Observation
  80. GRB050509b, Bok telescope B-band imaging
  81. Refined Chandra analysis of GRB 050509b
  82. GRB050509b, SDSS pre-burst observations
  83. GRB 050509b: Keck/Chandra Cross-Correlation
  84. GRB 050509b: Keck/Chandra Cross-Correlation
  85. Chandra observation of GRB 050509b
  86. GRB 050509b: RAPTOR deep, early limits.
  87. GRB050509B: Optical/Infared observations
  88. GRB 050509b: Swift/UVOT follow-up measurements
  89. GRB 050509b Milagro GeV/TeV Observations
  90. GRB050509B: Optical observations at the Very Large Telescope
  91. GRB 050509b: No Optical Variability in XRT Error Circle
  92. GRB 050509a: Swift-BAT refined analysis
  93. GRB 050509c: ROTSE-III Optical Limits
  94. GRB 050509B: WSRT Radio Observations
  95. GRB050509c: REM NIR and Optical observations (errata corrige to GCN 3400)
  96. GRB 050505, early TAROT observation
  97. GRB050509c (=H3751): An X-Ray Flash Localized By HETE
  98. GRB 050509b: Further Analysis of Keck LRIS Images
  99. GRB050509c: REM NIR and Optical observations
  100. GRB 050509b: Physical Properties of the Candidate Host galaxy

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