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"

45727 results found.

  1. GMRT detection of GRB 110328A
  2. GRB 110530A: optical observations at Mt. Terskol, second epoch
  3. GRB 110530A: Swift-XRT refined Analysis
  4. GRB 110530A: Swift/UVOT Detection of a Fading Afterglow
  5. GRB 110530A: Xinglong TNT observation
  6. GRB 110530A: Enhanced Swift-XRT position
  7. GRB 110530A: NOT optical observations
  8. GRB110530A: MITSuME Okayama Optical Observation
  9. GRB 110530A: optical observations at Mt. Terskol
  10. GRB 110530A: MASTER OT observations
  11. GRB 110530A: Swift-BAT refined analysis
  12. GRB 110530A: MITSuME Akeno Optical Observation
  13. GRB 110529A: Fermi GBM detection
  14. GRB 110530A: Swift detection of a burst with an optical afterglow
  15. Konus-Wind observation of GRB 110529A
  16. LAT Observations of GRB110529A
  17. EVLA afterglow limits on the high z GRB090429B
  18. Fermi Gamma-ray Burst Monitor trigger 328195911 is not a GRB
  19. Swift J1644+57/GRB 110328A, Additional HST Observations
  20. GRB 110521A: MASTER prompt optical limit
  21. GRB 110521A: Swift/UVOT Upper Limits
  22. GRB 110521A: Swift-XRT refined analysis
  23. GRB 110520A: NOT optical follow-ups
  24. GRB 110521A - NOT optical observation
  25. GRB 110521A: Swift-BAT refined analysis
  26. GRB 110521A: Enhanced Swift-XRT position
  27. GRB 110521A: MASTER synchronous and early optical observations limit
  28. Swift/UVOT observations of GRB110520A
  29. GRB 110521A: Swift detection of a burst
  30. GRB 110520A: Swift-BAT refined analysis
  31. GRB 110520A: IAC80 I-band observations
  32. GRB 110520A: Swift-XRT refined Analysis
  33. GRB 110520A: Enhanced Swift-XRT position
  34. GRB 110520A: WHT IR observations
  35. GRB 110520A - NOT optical observation
  36. GRB 110520A: Skynet/DAO optical observations
  37. GRB 110520A: Liverpool Telescope Observations
  38. GRB 110520A: TAROT Calern observatory optical observations
  39. GRB 110520A: MASTER-NET optical observations
  40. GRB 110520A: Swift detection of a burst
  41. Konus-Wind observation of GRB 110518A
  42. IPN localization of bright GRB 110518A
  43. Radio observations of GRB 110428A with the EVLA
  44. GRB 110519A, Swift-BAT refined analysis
  45. GRB 110519A: Swift detection of a burst
  46. GRB 110503A optical observation
  47. GRB 110426A: Fermi GBM detection
  48. GRB 110428A: Fermi-GBM observation
  49. GRB 110503A: TAROT Calern observatory optical observations
  50. GRB 110503A: Jet Break seen from TLS
  51. GRB 110503A optical observations
  52. Konus-Wind observation of GRB 110503A
  53. GRB 110422A: MASTER first 30 min OT light curve
  54. GRB 110422A: Herschel FIR observation preliminary report
  55. GRB 110503A: optical observation in CrAO
  56. GRB 110503A: R-band Detection
  57. GRB 110503A: Centimeter observation from EVLA
  58. GRB 110503A: Millimeter observation from SMA
  59. GRB 110503A: SARA-N Observations and Photometric Calibration
  60. GRB 110503A: Swift/UVOT Observations
  61. GRB 110503A: Swift-XRT refined Analysis
  62. GRB 110503A: PAIRITEL NIR Detection
  63. GRB 110503A: redshift confirmation from TNG
  64. GRB 110503A - TLS Afterglow Observations
  65. GRB 110503A: Swift-BAT refined analysis
  66. GRB 110503A: NOT afterglow photometry
  67. GRB 110503A: Redshift from 10.4m GTC
  68. GRB 110503A: Enhanced Swift-XRT position
  69. GRB 110503A: Swift detection of a burst with a bright optical counterpart
  70. GRB 110426A: Swift/XRT non-detection
  71. GRB 110428A : X-ray afterglow confirmation
  72. GRB 110428A: Suzaku WAM observation of the prompt emission
  73. Fermi-GBM data processing and delivery
  74. GRB 110422A: optical observations in CrAO
  75. GRB 110422A: Update of Herschel FIR observation schedule
  76. GRB 110428A : Swift-XRT observations
  77. Konus-Wind observation of GRB 110428A
  78. GRB 110428A: Fermi-LAT Detection
  79. GRB 110426A: MASTER synchronous with MAXI/GSC observations
  80. GRB 110426A: MAXI/GSC detection of a GRB
  81. GRB 110422A: optical observations in CrAO, second epoch
  82. GRB 110422A: Redshift confirmation from GTC
  83. GRB 110422A: tentative redshift from TNG
  84. GRB 110422A: Suzaku WAM observation of the prompt emission
  85. GRB 110422A: Herschel observation scheduled
  86. GRB110422A: NOT optical follow-ups
  87. GRB 110422A: optical observations in CrAO
  88. GRB110422A: MITSuME Ishigakijima Optical Observation
  89. Konus-Wind observation of GRB 110422A
  90. GRB 110422A: Further NOT observation
  91. GRB 110422A: Swift/UVOT Detection of optical afterglow
  92. GRB 110422A: Swift-XRT refined Analysis
  93. GRB 110422A: CQUEAN griz Observation
  94. GRB 110422A: THO optical observations
  95. GRB 110422A: Enhanced Swift-XRT position
  96. GRB 110422A: correction to the GCN circ. 11958
  97. GRB 110422A: TNG optical observations
  98. GRB 110422A: SAO RAS optical observations
  99. GRB 110422A: NOT optical observation
  100. GRB 110422A: MASTER earlier OT polarization 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