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"

36096 results found.

  1. GRB 110604A: Suzaku WAM observation of the prompt emission
  2. GRB 110610A: Suzaku WAM observation of the prompt emission
  3. GRB 110610A: Fermi GBM detection
  4. GRB 110610A: 1.23m CAHA optical observations
  5. GRB 110610A: Swift-XRT refined Analysis
  6. GRB 110610A: Swift/UVOT Upper Limits
  7. GRB 110610A: Enhanced Swift-XRT position
  8. GRB 110610A: Swift-BAT refined analysis
  9. Swift detection of the X-ray afterglow of GRB 110604A
  10. GRB 110610A: MASTER-NET optical observations
  11. GRB 110610A: Swift detection of a burst
  12. Konus-Wind observation of GRB 110604A
  13. GRB 110604A Detection by IPN Spacecraft and Swift-BAT
  14. GRB 110530A: optical observations in Mondy observatory
  15. GRB 110529A: Suzaku WAM observation of the prompt emission
  16. GMRT detection of GRB 110328A
  17. GRB 110530A: optical observations at Mt. Terskol, second epoch
  18. GRB 110530A: Swift-XRT refined Analysis
  19. GRB 110530A: Swift/UVOT Detection of a Fading Afterglow
  20. GRB 110530A: Xinglong TNT observation
  21. GRB 110530A: Enhanced Swift-XRT position
  22. GRB 110530A: NOT optical observations
  23. GRB110530A: MITSuME Okayama Optical Observation
  24. GRB 110530A: optical observations at Mt. Terskol
  25. GRB 110530A: Correction to GCN Circ 12050
  26. GRB 110530A: MASTER OT observations
  27. GRB 110530A: Swift-BAT refined analysis
  28. GRB 110530A: MITSuME Akeno Optical Observation
  29. GRB 110529A: Fermi GBM detection
  30. GRB 110530A: Swift detection of a burst with an optical afterglow
  31. Konus-Wind observation of GRB 110529A
  32. LAT Observations of GRB110529A
  33. EVLA afterglow limits on the high z GRB090429B
  34. Fermi Gamma-ray Burst Monitor trigger 328195911 is not a GRB
  35. Swift J1644+57/GRB 110328A, Additional HST Observations
  36. GRB 110521A: MASTER prompt optical limit
  37. GRB 110521A: Swift/UVOT Upper Limits
  38. GRB 110521A: Swift-XRT refined analysis
  39. GRB 110520A: NOT optical follow-ups
  40. GRB 110521A - NOT optical observation
  41. GRB 110521A: Swift-BAT refined analysis
  42. GRB 110521A: Enhanced Swift-XRT position
  43. GRB 110521A: MASTER synchronous and early optical observations limit
  44. Swift/UVOT observations of GRB110520A
  45. GRB 110521A: Swift detection of a burst
  46. GRB 110520A: Swift-BAT refined analysis
  47. GRB 110520A: IAC80 I-band observations
  48. GRB 110520A: Swift-XRT refined Analysis
  49. GRB 110520A: Enhanced Swift-XRT position
  50. GRB 110520A: WHT IR observations
  51. GRB 110520A - NOT optical observation
  52. GRB 110520A: Skynet/DAO optical observations
  53. GRB 110520A: Liverpool Telescope Observations
  54. GRB 110520A: TAROT Calern observatory optical observations
  55. GRB 110520A: MASTER-NET optical observations
  56. GRB 110520A: Swift detection of a burst
  57. Konus-Wind observation of GRB 110518A
  58. IPN localization of bright GRB 110518A
  59. Radio observations of GRB 110428A with the EVLA
  60. GRB 110519A, Swift-BAT refined analysis
  61. GRB 110519A: Swift detection of a burst
  62. GRB 110503A optical observation
  63. GRB 110426A: Fermi GBM detection
  64. GRB 110428A: Fermi-GBM observation
  65. GRB 110503A: TAROT Calern observatory optical observations
  66. GRB 110503A: Jet Break seen from TLS
  67. GRB 110503A optical observations
  68. Konus-Wind observation of GRB 110503A
  69. GRB 110422A: MASTER first 30 min OT light curve
  70. GRB 110422A: Herschel FIR observation preliminary report
  71. GRB 110503A: optical observation in CrAO
  72. GRB 110503A: R-band Detection
  73. GRB 110503A: Centimeter observation from EVLA
  74. GRB 110503A: Millimeter observation from SMA
  75. GRB 110503A: SARA-N Observations and Photometric Calibration
  76. GRB 110503A: Swift/UVOT Observations
  77. GRB 110503A: Swift-XRT refined Analysis
  78. GRB 110503A: PAIRITEL NIR Detection
  79. GRB 110503A: redshift confirmation from TNG
  80. GRB 110503A - TLS Afterglow Observations
  81. GRB 110503A: Swift-BAT refined analysis
  82. GRB 110503A: NOT afterglow photometry
  83. GRB 110503A: Redshift from 10.4m GTC
  84. GRB 110503A: Enhanced Swift-XRT position
  85. GRB 110503A: Swift detection of a burst with a bright optical counterpart
  86. GRB 110426A: Swift/XRT non-detection
  87. GRB 110428A : X-ray afterglow confirmation
  88. GRB 110428A: Suzaku WAM observation of the prompt emission
  89. GRB 110422A: optical observations in CrAO
  90. GRB 110422A: Update of Herschel FIR observation schedule
  91. GRB 110428A : Swift-XRT observations
  92. Konus-Wind observation of GRB 110428A
  93. GRB 110428A: Fermi-LAT Detection
  94. GRB 110426A: MASTER synchronous with MAXI/GSC observations
  95. GRB 110426A: MAXI/GSC detection of a GRB
  96. GRB 110422A: optical observations in CrAO, second epoch
  97. GRB 110422A: Redshift confirmation from GTC
  98. GRB 110422A: tentative redshift from TNG
  99. GRB 110422A: Suzaku WAM observation of the prompt emission
  100. GRB 110422A: Herschel observation scheduled

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