Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

37551 results found.

  1. GRB 130925A: Fermi GBM Detection
  2. Konus-Wind observation of GRB 130925A
  3. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  4. GRB 130925A: RATIR Optical and NIR Observations
  5. GRB 130925A Swift-BAT refined analysis
  6. GRB 130925A: Historical non-detection from Rosat-HRI
  7. Fermi GBM detection of GRB 130925A and a possible precursor
  8. GRB 130925A: Swift-XRT refined Analysis
  9. GRB 130925A: Initial Similarities to Swift J1644+57
  10. GRB 130925A: TAROT La Silla observatory optical observations
  11. GRB 130925A: Enhanced Swift-XRT position
  12. GRB 130925A: VLT/X-shooter redshift
  13. GRB 130925A: VLT/UVES observations
  14. GRB 130925A: MAXI/GSC detection
  15. GRB 130925A: GROND afterglow candidate
  16. GRB 130925A: Swift detection of a burst
  17. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  18. GRB 130831A: RTT150 optical observations
  19. GRB 130702A: RTT150 optical observations
  20. GRB 130831A: RATIR Confirmation of NIR/Optical Afterglow Flattening
  21. GRB 130903A: optical observations
  22. GRB 130907A: Maidanak optical observations
  23. GRB 130912A: AAO optical upper limit
  24. Fermi Trigger 401326696: MASTER prompt optical observations
  25. GRB 130831A: Maidanak optical observations, possible emerging Supernova
  26. GRB 130919A: Skynet PROMPT-CTIO optical upper limits
  27. GRB 130919A, Swift-BAT refined analysis
  28. GRB 130913A detected in ground analysis of Swift-BAT data
  29. GRB 130919A: Swift detection of a burst
  30. GRB 130903A: Further Swift XRT observations.
  31. GRB 130606A: Chandra observation
  32. GRB 130912A: Swift/UVOT Upper Limits
  33. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  34. GRB 130912A: 5.8 GHz VLA upper limit
  35. GRB 130912A: RATIR Optical and NIR Upper Limits
  36. Konus-Wind observation of GRB 130912A
  37. GRB 130912A: WHT confirmation of optical counterpart
  38. GRB 130907A: Continued RATIR Optical and NIR Observations
  39. GRB 130912A: P60 Observations
  40. GRB 130912A: Swift-XRT refined Analysis
  41. GRB 130907A: MASTER refined analysis
  42. GRB 130912A: Fermi GBM detection
  43. GRB 130912A: Skynet DSO-14/Yerkes-41/PROMPT-CTIO observations
  44. GRB 130912A: Enhanced Swift-XRT position
  45. GRB 130912A, Swift-BAT refined analysis
  46. GRB 130912A: REM optical/NIR upper limits
  47. GRB 130912A: GROND observations
  48. GRB 130912A: KAIT optical upper limit
  49. GRB 130912A: Swift detection of a short burst
  50. GRB 130907A: AMI radio detection
  51. GRB 120419A: Swift XRT confirmation of the afterglow
  52. GRB 130907A: Continued RATIR Optical and NIR Observations
  53. GRB 130907A: RATIR Optical and NIR Observations
  54. GRB 130907A: WSRT radio detection
  55. GRB 130828A: Further Swift XRT observations
  56. GRB 130907A: Further Swift-BAT refined analysis
  57. GRB 130907A: INTEGRAL/SPI-ACS light curve
  58. Konus-Wind observation of GRB 130907A
  59. GRB 130907A, Swift-BAT refined analysis
  60. GRB 130907A: T21 optical observations
  61. GRB 130907A: VLA detection
  62. GRB 130907A: Swift-XRT refined Analysis
  63. GRB 130907A: Enhanced Swift-XRT position
  64. Errata of GRB name in GCN 15196: should have been GRB 130907A instead of GRB 120916A
  65. GRB 120916A: Fermi-LAT detection of a burst
  66. GRB 130907A: Swift/UVOT Detection
  67. GRB 130907A: Early Tautenburg detections, red afterglow
  68. GRB 130907A: Skynet DSO-14/Yerkes-41/GORT confirmation of a fading afterglow
  69. GRB 130907A: RATIR Optical and NIR Afterglow Confirmation
  70. GRB 130907A: Skynet DSO-14/Yerkes-41 detections of a possible afterglow
  71. GRB 130831A: Maidanak optical observations
  72. GRB 130831A: optical observation in Chuguev AO
  73. GRB 130831A: ISON-Kislovodsk optical observations
  74. GRB 130907A: NOT redshift
  75. GRB 130831A: optical observation in Gissar AO
  76. GRB 130831A: ISON-UAFO optical observations
  77. GRB 130907A: MASTER early OT observations
  78. GRB 130907A: Swift detection of a burst with an optical counterpart
  79. Swift follow-up results of the possible weak INTEGRAL GRB
  80. GRB 130903A: Swift/UVOT Upper Limits
  81. Swift follow-up of an INTEGRAL possible weak GRB
  82. GRB 130831A: RATIR Optical and NIR Upper Limits
  83. GRB 130822A: nearby galaxy redshifts
  84. GRB 130903A: GROND Afterglow Discovery
  85. GRB 130903A: MASTER early optical limit
  86. GRB 130903A: Fermi GBM observation
  87. GRB 130831A: JCMT SCUBA-2 sub-mm observation
  88. GRB 130903A: Swift-XRT observations
  89. Swift trigger 569022 is a new Galactic source Swift J1734.5-3027
  90. GRB 130903A: ISON-Kislovodsk optical Upper Limits
  91. GRB 130903A: GROND Upper Limits
  92. GRB 130903A: A long GRB detected by INTEGRAL
  93. GRB 130831A: Swift/UVOT Observations
  94. GRB 130831A: Montarrenti Observatory optical follow-up
  95. GRB 130831A: Optical Observations via Virtual Telescope, follow-up
  96. GRB 130831A: RATIR Optical and NIR Observations
  97. GRB 130831A: Continued Skynet/PROMPT-SSO, PROMPT-CTIO and Yerkes-41 detections
  98. GRB 130831B, Swift-BAT refined analysis
  99. GRB 130831A: VLA Observations
  100. GRB 130831A: T100 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