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"

23445 results found.

  1. GRB 110530A: Enhanced Swift-XRT position
  2. GRB 110530A: NOT optical observations
  3. GRB110530A: MITSuME Okayama Optical Observation
  4. GRB 110529A: Fermi GBM detection
  5. GRB 110530A: Swift detection of a burst with an optical afterglow
  6. LAT Observations of GRB110529A
  7. EVLA afterglow limits on the high z GRB090429B
  8. Swift J1644+57/GRB 110328A, Additional HST Observations
  9. GRB 110521A: MASTER prompt optical limit
  10. GRB 110521A: Swift/UVOT Upper Limits
  11. GRB 110520A: NOT optical follow-ups
  12. GRB 110521A - NOT optical observation
  13. GRB 110521A: Enhanced Swift-XRT position
  14. GRB 110521A: MASTER synchronous and early optical observations limit
  15. Swift/UVOT observations of GRB110520A
  16. GRB 110521A: Swift detection of a burst
  17. GRB 110520A: IAC80 I-band observations
  18. GRB 110520A: Enhanced Swift-XRT position
  19. GRB 110520A: WHT IR observations
  20. GRB 110520A - NOT optical observation
  21. GRB 110520A: Skynet/DAO optical observations
  22. GRB 110520A: Liverpool Telescope Observations
  23. GRB 110520A: TAROT Calern observatory optical observations
  24. GRB 110520A: Swift detection of a burst
  25. IPN localization of bright GRB 110518A
  26. Radio observations of GRB 110428A with the EVLA
  27. GRB 110519A, Swift-BAT refined analysis
  28. GRB 110519A: Swift detection of a burst
  29. GRB 110426A: Fermi GBM detection
  30. GRB 110503A: TAROT Calern observatory optical observations
  31. GRB 110503A: Jet Break seen from TLS
  32. GRB 110503A: optical observation in CrAO
  33. GRB 110503A: Centimeter observation from EVLA
  34. GRB 110503A: Millimeter observation from SMA
  35. GRB 110503A: SARA-N Observations and Photometric Calibration
  36. GRB 110503A: Swift/UVOT Observations
  37. GRB 110503A: PAIRITEL NIR Detection
  38. GRB 110503A - TLS Afterglow Observations
  39. GRB 110503A: Enhanced Swift-XRT position
  40. GRB 110503A: Swift detection of a burst with a bright optical counterpart
  41. GRB 110426A: Swift/XRT non-detection
  42. GRB 110428A : X-ray afterglow confirmation
  43. GRB 110422A: optical observations in CrAO
  44. GRB 110428A : Swift-XRT observations
  45. GRB 110428A: Fermi-LAT Detection
  46. GRB 110426A: MASTER synchronous with MAXI/GSC observations
  47. GRB 110422A: optical observations in CrAO, second epoch
  48. GRB 110422A: Herschel observation scheduled
  49. GRB110422A: NOT optical follow-ups
  50. GRB 110422A: optical observations in CrAO
  51. GRB110422A: MITSuME Ishigakijima Optical Observation
  52. GRB 110422A: Further NOT observation
  53. GRB 110422A: Swift/UVOT Detection of optical afterglow
  54. GRB 110422A: THO optical observations
  55. GRB 110422A: Enhanced Swift-XRT position
  56. GRB 110422A: TNG optical observations
  57. GRB 110422A: SAO RAS optical observations
  58. GRB 110422A: NOT optical observation
  59. GRB 110422A: Swift-BAT refined analysis
  60. GRB 110422A: Mondy optical observations
  61. GRB 110422A: Swift detection of a burst
  62. GRB 110420B: Swift/UVOT Upper Limits
  63. GRB110420A: GROND detection of the Optical/NIR Afterglow Candidate
  64. GRB 110420B: Swift-XRT afterglow candidate retraction
  65. GRB 110420B, GROND observations
  66. GRB 110420A Swift/UVOT Observations
  67. GRB 110420B: Swift-XRT afterglow candidate
  68. GRB 110420B: Swift detection of a short hard burst
  69. GRB 110420A: Enhanced Swift-XRT position
  70. GRB 110420A: Swift detection of a burst with optical counterpart
  71. GRB110414A: MITSuME Ishigakijima Optical upper limits
  72. GRB 110414A: GROND upper limits
  73. GRB110414A: MITSuME Okayama Optical upper limits
  74. GRB 110414A: Swift/UVOT Upper limits
  75. GRB 110414A: Enhanced Swift-XRT position
  76. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
  77. GRB 110414A: Swift detection of a burst
  78. GRB 110411A: PAIRITEL NIR Upper Limits
  79. GRB 110411A: Swift/UVOT Upper Limits
  80. GRB 110412A: Swift detection of a burst
  81. GRB 110411A: Enhanced Swift-XRT position
  82. GRB 110411A: Swift detection of a burst
  83. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  84. GRB 110407A:VLF observations on 20.27kHz
  85. GRB 110328A / Swift J164449.3+573451: optical observations
  86. GRB 110328A/Swift J164449.3+573451 UVOT Upper Limits
  87. GRB 110406A: Positional coincidence with NGC 404
  88. GRB 110407A: MASTER optical observations
  89. GRB110407A: UVOT Upper Limits
  90. GRB 110407A: GROND Detection of the Optical Afterglow
  91. GRB 110407A: MITSuME Okayama and Ishigakijima Optical upper limits
  92. GRB 110407A: NOT optical observations
  93. GRB 110407A: Enhanced Swift-XRT position
  94. IPN triangulation of the bright GRB110406A
  95. GRB 110407A : Xinglong TNT upper limit
  96. GRB 110407A: Swift detection of a burst
  97. GRB 110328A/Swift J164449.3+573451: BAT recent rate increase and pre-outburst,light curve
  98. GRB 110406A: An exceptionally bright burst detected by INTEGRAL SPI-ACS
  99. GRB 110402A: fading optical afterglow
  100. GRB 110402A: LOAO Optical Observation

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