Skip to main content
End of Swift Science Operations, CHIME Notices Unavailable During Upgrade. 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"

28289 results found.

  1. GRB 110604A Detection by IPN Spacecraft and Swift-BAT
  2. GRB 110529A: Suzaku WAM observation of the prompt emission
  3. GMRT detection of GRB 110328A
  4. GRB 110530A: Swift-XRT refined Analysis
  5. GRB 110530A: Swift/UVOT Detection of a Fading Afterglow
  6. GRB 110530A: Enhanced Swift-XRT position
  7. GRB 110530A: NOT optical observations
  8. GRB110530A: MITSuME Okayama Optical Observation
  9. GRB 110530A: Swift-BAT refined analysis
  10. GRB 110529A: Fermi GBM detection
  11. GRB 110530A: Swift detection of a burst with an optical afterglow
  12. LAT Observations of GRB110529A
  13. EVLA afterglow limits on the high z GRB090429B
  14. Swift J1644+57/GRB 110328A, Additional HST Observations
  15. GRB 110521A: MASTER prompt optical limit
  16. GRB 110521A: Swift/UVOT Upper Limits
  17. GRB 110521A: Swift-XRT refined analysis
  18. GRB 110520A: NOT optical follow-ups
  19. GRB 110521A - NOT optical observation
  20. GRB 110521A: Swift-BAT refined analysis
  21. GRB 110521A: Enhanced Swift-XRT position
  22. GRB 110521A: MASTER synchronous and early optical observations limit
  23. Swift/UVOT observations of GRB110520A
  24. GRB 110521A: Swift detection of a burst
  25. GRB 110520A: Swift-BAT refined analysis
  26. GRB 110520A: IAC80 I-band observations
  27. GRB 110520A: Swift-XRT refined Analysis
  28. GRB 110520A: Enhanced Swift-XRT position
  29. GRB 110520A: WHT IR observations
  30. GRB 110520A - NOT optical observation
  31. GRB 110520A: TAROT Calern observatory optical observations
  32. GRB 110520A: Swift detection of a burst
  33. IPN localization of bright GRB 110518A
  34. GRB 110519A, Swift-BAT refined analysis
  35. GRB 110519A: Swift detection of a burst
  36. GRB 110426A: Fermi GBM detection
  37. GRB 110428A: Fermi-GBM observation
  38. GRB 110503A: TAROT Calern observatory optical observations
  39. Konus-Wind observation of GRB 110503A
  40. GRB 110503A: optical observation in CrAO
  41. GRB 110503A: Centimeter observation from EVLA
  42. GRB 110503A: Millimeter observation from SMA
  43. GRB 110503A: SARA-N Observations and Photometric Calibration
  44. GRB 110503A: Swift/UVOT Observations
  45. GRB 110503A: Swift-XRT refined Analysis
  46. GRB 110503A: PAIRITEL NIR Detection
  47. GRB 110503A: Swift-BAT refined analysis
  48. GRB 110503A: Enhanced Swift-XRT position
  49. GRB 110503A: Swift detection of a burst with a bright optical counterpart
  50. GRB 110426A: Swift/XRT non-detection
  51. GRB 110428A : X-ray afterglow confirmation
  52. GRB 110428A: Suzaku WAM observation of the prompt emission
  53. GRB 110422A: optical observations in CrAO
  54. GRB 110428A : Swift-XRT observations
  55. GRB 110426A: MASTER synchronous with MAXI/GSC observations
  56. GRB 110422A: optical observations in CrAO, second epoch
  57. GRB 110422A: Suzaku WAM observation of the prompt emission
  58. GRB110422A: NOT optical follow-ups
  59. GRB 110422A: optical observations in CrAO
  60. GRB110422A: MITSuME Ishigakijima Optical Observation
  61. GRB 110422A: Further NOT observation
  62. GRB 110422A: Swift/UVOT Detection of optical afterglow
  63. GRB 110422A: Swift-XRT refined Analysis
  64. GRB 110422A: Enhanced Swift-XRT position
  65. GRB 110422A: TNG optical observations
  66. GRB 110422A: SAO RAS optical observations
  67. GRB 110422A: NOT optical observation
  68. GRB 110422A: Swift-BAT refined analysis
  69. GRB 110422A: Mondy optical observations
  70. GRB 110422A: Swift detection of a burst
  71. GRB 110420B: Swift/UVOT Upper Limits
  72. GRB110420A: GROND detection of the Optical/NIR Afterglow Candidate
  73. GRB 110420B: Swift-XRT afterglow candidate retraction
  74. GRB 110420B, GROND observations
  75. GRB 110420A Swift/UVOT Observations
  76. GRB 110420B: Swift-XRT afterglow candidate
  77. GRB 110420B: Swift-BAT refined analysis
  78. GRB 110420A: Swift-BAT refined analysis
  79. GRB 110420A: Swift-XRT refined Analysis
  80. GRB 110420A: Enhanced Swift-XRT position
  81. GRB 110420A: Swift detection of a burst with optical counterpart
  82. GRB110414A: MITSuME Ishigakijima Optical upper limits
  83. GRB 110414A: GROND upper limits
  84. GRB110414A: MITSuME Okayama Optical upper limits
  85. GRB 110414A: Swift-BAT Refined Analysis
  86. GRB 110414A: Swift/UVOT Upper limits
  87. GRB 110414A: Swift-XRT refined Analysis
  88. GRB 110414A: Enhanced Swift-XRT position
  89. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
  90. GRB 110414A : Faulkes Telescope North observations
  91. GRB 110414A: Swift detection of a burst
  92. GRB 110411A: PAIRITEL NIR Upper Limits
  93. GRB 110412A: Swift-BAT refined analysis
  94. GRB 110411A: Swift-XRT refined Analysis
  95. GRB 110411A: Swift/UVOT Upper Limits
  96. GRB 110411A : Xinglong TNT OT candidate
  97. GRB 110411A, Swift-BAT refined analysis
  98. GRB 110411A: Enhanced Swift-XRT position
  99. GRB 110411A: Swift detection of a burst
  100. GRB 110407A: Swift-XRT refined Analysis

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