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"

26570 results found.

  1. GRB 110610A: 1.23m CAHA optical observations
  2. GRB 110610A: Swift-XRT refined Analysis
  3. GRB 110610A: Swift/UVOT Upper Limits
  4. GRB 110610A: Enhanced Swift-XRT position
  5. Swift detection of the X-ray afterglow of GRB 110604A
  6. GRB 110610A: Swift detection of a burst
  7. Konus-Wind observation of GRB 110604A
  8. GRB 110604A Detection by IPN Spacecraft and Swift-BAT
  9. GRB 110529A: Suzaku WAM observation of the prompt emission
  10. GMRT detection of GRB 110328A
  11. GRB 110530A: optical observations at Mt. Terskol, second epoch
  12. GRB 110530A: Swift-XRT refined Analysis
  13. GRB 110530A: Swift/UVOT Detection of a Fading Afterglow
  14. GRB 110530A: Enhanced Swift-XRT position
  15. GRB 110530A: NOT optical observations
  16. GRB110530A: MITSuME Okayama Optical Observation
  17. GRB 110530A: Swift-BAT refined analysis
  18. GRB 110529A: Fermi GBM detection
  19. GRB 110530A: Swift detection of a burst with an optical afterglow
  20. LAT Observations of GRB110529A
  21. EVLA afterglow limits on the high z GRB090429B
  22. Swift J1644+57/GRB 110328A, Additional HST Observations
  23. GRB 110521A: MASTER prompt optical limit
  24. GRB 110521A: Swift/UVOT Upper Limits
  25. GRB 110521A: Swift-XRT refined analysis
  26. GRB 110520A: NOT optical follow-ups
  27. GRB 110521A - NOT optical observation
  28. GRB 110521A: Enhanced Swift-XRT position
  29. GRB 110521A: MASTER synchronous and early optical observations limit
  30. Swift/UVOT observations of GRB110520A
  31. GRB 110521A: Swift detection of a burst
  32. GRB 110520A: Swift-BAT refined analysis
  33. GRB 110520A: IAC80 I-band observations
  34. GRB 110520A: Swift-XRT refined Analysis
  35. GRB 110520A: Enhanced Swift-XRT position
  36. GRB 110520A: WHT IR observations
  37. GRB 110520A - NOT optical observation
  38. GRB 110520A: Liverpool Telescope Observations
  39. GRB 110520A: TAROT Calern observatory optical observations
  40. GRB 110520A: Swift detection of a burst
  41. IPN localization of bright GRB 110518A
  42. Radio observations of GRB 110428A with the EVLA
  43. GRB 110519A, Swift-BAT refined analysis
  44. GRB 110426A: Fermi GBM detection
  45. GRB 110428A: Fermi-GBM observation
  46. GRB 110503A: TAROT Calern observatory optical observations
  47. GRB 110503A: optical observation in CrAO
  48. GRB 110503A: Centimeter observation from EVLA
  49. GRB 110503A: Millimeter observation from SMA
  50. GRB 110503A: SARA-N Observations and Photometric Calibration
  51. GRB 110503A: Swift/UVOT Observations
  52. GRB 110503A: Swift-XRT refined Analysis
  53. GRB 110503A: PAIRITEL NIR Detection
  54. GRB 110503A: Enhanced Swift-XRT position
  55. GRB 110503A: Swift detection of a burst with a bright optical counterpart
  56. GRB 110426A: Swift/XRT non-detection
  57. GRB 110428A : X-ray afterglow confirmation
  58. GRB 110428A: Suzaku WAM observation of the prompt emission
  59. GRB 110422A: optical observations in CrAO
  60. GRB 110428A : Swift-XRT observations
  61. Konus-Wind observation of GRB 110428A
  62. GRB 110426A: MASTER synchronous with MAXI/GSC observations
  63. GRB 110426A: MAXI/GSC detection of a GRB
  64. GRB 110422A: optical observations in CrAO, second epoch
  65. GRB 110422A: Herschel observation scheduled
  66. GRB110422A: NOT optical follow-ups
  67. GRB 110422A: optical observations in CrAO
  68. GRB110422A: MITSuME Ishigakijima Optical Observation
  69. Konus-Wind observation of GRB 110422A
  70. GRB 110422A: Further NOT observation
  71. GRB 110422A: Swift/UVOT Detection of optical afterglow
  72. GRB 110422A: Swift-XRT refined Analysis
  73. GRB 110422A: Enhanced Swift-XRT position
  74. GRB 110422A: TNG optical observations
  75. GRB 110422A: SAO RAS optical observations
  76. GRB 110422A: NOT optical observation
  77. GRB 110422A: Mondy optical observations
  78. GRB 110422A: Swift detection of a burst
  79. GRB 110420B: Swift/UVOT Upper Limits
  80. GRB110420A: GROND detection of the Optical/NIR Afterglow Candidate
  81. GRB 110420B: Swift-XRT afterglow candidate retraction
  82. GRB 110420B: Fermi GBM observation
  83. Konus-Wind observation of GRB 110420A
  84. GRB 110420B: Spectral lag indicates short hard burst
  85. GRB 110420B, GROND observations
  86. GRB 110420A Swift/UVOT Observations
  87. GRB 110420B: Swift-XRT afterglow candidate
  88. GRB 110420A: Swift-XRT refined Analysis
  89. GRB 110420A: Enhanced Swift-XRT position
  90. GRB 110420A: Swift detection of a burst with optical counterpart
  91. GRB110414A: MITSuME Ishigakijima Optical upper limits
  92. GRB 110414A: GROND upper limits
  93. GRB110414A: MITSuME Okayama Optical upper limits
  94. GRB 110414A: Swift/UVOT Upper limits
  95. GRB 110414A: Swift-XRT refined Analysis
  96. GRB 110414A: Enhanced Swift-XRT position
  97. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
  98. GRB 110414A : Faulkes Telescope North observations
  99. GRB 110414A: Swift detection of a burst
  100. GRB 110411A: PAIRITEL NIR Upper Limits

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