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"

37763 results found.

  1. GRB 110422A: MASTER first 30 min OT light curve
  2. GRB 110422A: Herschel FIR observation preliminary report
  3. GRB 110503A: optical observation in CrAO
  4. GRB 110503A: R-band Detection
  5. GRB 110503A: Centimeter observation from EVLA
  6. GRB 110503A: Millimeter observation from SMA
  7. GRB 110503A: SARA-N Observations and Photometric Calibration
  8. GRB 110503A: Swift/UVOT Observations
  9. GRB 110503A: Swift-XRT refined Analysis
  10. GRB 110503A: PAIRITEL NIR Detection
  11. GRB 110503A: redshift confirmation from TNG
  12. GRB 110503A - TLS Afterglow Observations
  13. GRB 110503A: Swift-BAT refined analysis
  14. GRB 110503A: NOT afterglow photometry
  15. GRB 110503A: Redshift from 10.4m GTC
  16. GRB 110503A: Enhanced Swift-XRT position
  17. GRB 110503A: Swift detection of a burst with a bright optical counterpart
  18. GRB 110426A: Swift/XRT non-detection
  19. GRB 110428A : X-ray afterglow confirmation
  20. GRB 110428A: Suzaku WAM observation of the prompt emission
  21. Fermi-GBM data processing and delivery
  22. GRB 110422A: optical observations in CrAO
  23. GRB 110422A: Update of Herschel FIR observation schedule
  24. GRB 110428A : Swift-XRT observations
  25. Konus-Wind observation of GRB 110428A
  26. GRB 110428A: Fermi-LAT Detection
  27. GRB 110426A: MASTER synchronous with MAXI/GSC observations
  28. GRB 110426A: MAXI/GSC detection of a GRB
  29. GRB 110422A: optical observations in CrAO, second epoch
  30. GRB 110422A: Redshift confirmation from GTC
  31. GRB 110422A: tentative redshift from TNG
  32. GRB 110422A: Suzaku WAM observation of the prompt emission
  33. GRB 110422A: Herschel observation scheduled
  34. GRB110422A: NOT optical follow-ups
  35. GRB 110422A: optical observations in CrAO
  36. GRB110422A: MITSuME Ishigakijima Optical Observation
  37. Konus-Wind observation of GRB 110422A
  38. GRB 110422A: Further NOT observation
  39. GRB 110422A: Swift/UVOT Detection of optical afterglow
  40. GRB 110422A: Swift-XRT refined Analysis
  41. GRB 110422A: CQUEAN griz Observation
  42. GRB 110422A: THO optical observations
  43. GRB 110422A: Enhanced Swift-XRT position
  44. GRB 110422A: correction to the GCN circ. 11958
  45. GRB 110422A: TNG optical observations
  46. GRB 110422A: SAO RAS optical observations
  47. GRB 110422A: NOT optical observation
  48. GRB 110422A: MASTER earlier OT polarization observations
  49. GRB 110422A: Swift-BAT refined analysis
  50. GRB 110422A: Mondy optical observations
  51. GRB 110422A: Swift detection of a burst
  52. GRB 110328A/Swift J164449.3+573451: Maidanak Optical Observation
  53. GRB 110420B: Swift/UVOT Upper Limits
  54. GRB110420A: GROND detection of the Optical/NIR Afterglow Candidate
  55. GRB 110420B: Swift-XRT afterglow candidate retraction
  56. GRB 110420B: Fermi GBM observation
  57. Konus-Wind observation of GRB 110420A
  58. GRB 110420B: Spectral lag indicates short hard burst
  59. GRB 110420B, GROND observations
  60. GRB 110420A Swift/UVOT Observations
  61. GRB 110420B: Swift-XRT afterglow candidate
  62. GRB 110420B: Swift-BAT refined analysis
  63. GRB 110420A: Swift-BAT refined analysis
  64. GRB 110420B: Swift detection of a short hard burst
  65. GRB 110420A: Swift-XRT refined Analysis
  66. GRB 110420A: Enhanced Swift-XRT position
  67. GRB 110420A: Swift detection of a burst with optical counterpart
  68. GRB110414A: MITSuME Ishigakijima Optical upper limits
  69. GRB 110414A: GROND upper limits
  70. GRB110414A: MITSuME Okayama Optical upper limits
  71. GRB 110414A: Swift-BAT Refined Analysis
  72. GRB 110414A: Swift/UVOT Upper limits
  73. GRB 110414A: Swift-XRT refined Analysis
  74. GRB 110414A: Enhanced Swift-XRT position
  75. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
  76. GRB 110414A : Faulkes Telescope North observations
  77. GRB 110414A: Swift detection of a burst
  78. GRB 110411A: PAIRITEL NIR Upper Limits
  79. GRB 110412A: Swift-BAT refined analysis
  80. GRB 110411A: optical limits from OSN
  81. GRB 110411A: Swift-XRT refined Analysis
  82. GRB 110412A: Fermi GBM observation
  83. GRB 110411A: Swift/UVOT Upper Limits
  84. GRB 110411A: MASTER prompt and follow-up optical limits
  85. GRB 110411A : Xinglong TNT OT candidate
  86. GRB 110412A: Swift detection of a burst
  87. GRB 110411A, Swift-BAT refined analysis
  88. GRB 110411A: Enhanced Swift-XRT position
  89. GRB 110411A: MASTER optical observations
  90. GRB 110411A: Swift detection of a burst
  91. GRB 110328A / Swift J164449.3+573451: R-band Monitoring
  92. GRB 110407A: Swift-XRT refined Analysis
  93. GRB 110328A / Swift J164449.3+573451: MASTER pre, prompt and follow-up observations
  94. GRB 110407A:VLF observations on 20.27kHz
  95. GRB 110328A / Swift J164449.3+573451: optical observations
  96. GRB 110407A: SMARTS optical limit
  97. GRB 110328A / Swift J164449.3+573451: VLBA Observations
  98. GRB 110328A/Swift J164449.3+573451 UVOT Upper Limits
  99. GRB 110406A: Positional coincidence with NGC 404
  100. GRB 110407A: MASTER optical 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