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"

41975 results found.

  1. GRB 160826A: Swift/UVOT Upper Limits
  2. GRB 160825A: not localized by Swift
  3. GRB 160820A: Fermi GBM observation
  4. GRB 160826A: Swift-XRT refined Analysis
  5. GRB160821A: Astrosat CZTI (veto) detection
  6. GRB 160826A: Swift detection of a burst
  7. GRB 160821A: CALET Gamma-Ray Burst Monitor detection
  8. GRB 160825A: Swift ToO observations
  9. GRB 160824A: 1.5m OSN I-band observation
  10. GRB 160824A: ISON/Terskol optical observations
  11. GRB 160824A: Swift-BAT refined analysis
  12. GRB 160824A: Swift/UVOT Possible Afterglow Detection
  13. GRB 160824A: Bassano Bresciano Observatory upper limits
  14. GRB 160824A: Swift-XRT refined Analysis
  15. GRB 160824B: Fermi GBM detection
  16. GRB 160824A: Swift detection of a burst
  17. GRB 160821B: VLA 5.0 GHz observations
  18. Konus-Wind observation of GRB 160822A
  19. IPN Triangulation of GRB 160822A (short/hard)
  20. Konus-Wind observation of GRB 160820A
  21. IPN Triangulation of GRB 160820A (short/hard)
  22. Possible radio detection of GRB160703A with the GMRT
  23. Possible radio detection of GRB160623A with the GMRT
  24. GRB 160821B: GTC follow-up observation
  25. GRB 160821B: WHT afterglow confirmation and redshift of candidate host
  26. GRB 160822672: Fermi GBM detection
  27. GRB 160821B: Swift-BAT refined analysis
  28. GRB 160821B: Fermi GBM Detection
  29. Konus-Wind observation of GRB 160821A
  30. GRB 160821B: Swift-XRT refined Analysis
  31. GRB 160821A: Swift-BAT refined analysis
  32. GRB 160821B: Swift/UVOT Upper Limits
  33. Short GRB 160821B: MASTER early optical observations
  34. GRB 160821A: Fermi-LAT refined analysis
  35. GRB 160821A: Fermi GBM Detection
  36. GRB 160821B: NOT optical afterglow candidate
  37. GRB 160821B: Swift detection of a short burst
  38. GRB 160821A: TAROT Calern observatory optical detection
  39. GRB 160821A: Fermi-LAT detection of a bright burst
  40. GRB 160821A: Swift detection of a bright burst
  41. GRB 160816A: TSHAO optical observations
  42. INTEGRAL/SPI-ACS observation of IceCube HESE 128340 58537957
  43. BAT detection and localization of GRB 160819A
  44. GRB 160819A: Fermi GBM detection
  45. GRB 160816A: ISON/UAFO optical observations
  46. GRB 160816A: Further RATIR Optical and NIR Observations
  47. GRB 160815A: CALET Gamma-Ray Burst Monitor detection
  48. GRB 160816A: MASTER OT early detection on coaded images
  49. GRB 160816A: RATIR Optical and NIR Afterglow Confirmation
  50. GRB 160816A: confirmed fading with the LT
  51. GRB 160816A iTelescope observation
  52. Fermi GBM Observations of IceCube-160806A
  53. GRB 160814A: CALET Gamma-Ray Burst Monitor detection
  54. GRB 160816A: Swift/UVOT Detection
  55. GRB 160816A: IPN annulus
  56. GRB 160804A: 15 GHz detections and upper limit from AMI
  57. GRB 160801A: 15 GHz upper limits from AMI
  58. GRB 160714A: 15 GHz upper limits from AMI
  59. Konus-Wind observation of GRB 160816A
  60. GRB 160816A: RATIR Optical and NIR Observations
  61. GRB 160816A: LCOGT-FTN optical candidate
  62. GRB 160815A: GWAC-F60A upper limit
  63. GRB 160816A: Swift-XRT afterglow detection
  64. GRB 160816A: MASTER inspection
  65. GRB 160816730A: Fermi GBM detection/observation
  66. GRB 160816A: Swift ToO observations
  67. GRB 160816A: Fermi-LAT detection
  68. GRB 160815A: Swift/UVOT Detection
  69. Konus-Wind observation of GRB 160814A
  70. GRB 160815A: Swift-BAT refined analysis
  71. GRB 160815A: Swift-XRT refined Analysis
  72. GRB 160815A: Fermi GBM detection/observation
  73. GRB 160815A: Swift/UVOT Afterglow Detection
  74. GRB 160815A: Swift detection of a burst
  75. GRB 160814A: MAXI/GSC detection
  76. GRB 160804B: CALET Gamma-Ray Burst Monitor detection
  77. IceCube 160806A: Lomonosov BDRG gamma ray prompt observations
  78. Fermi GBM trigger 160812507/492696620 is not a GRB
  79. INTEGRAL/SPI-ACS and IBIS_VETO search for prompt gamma-ray counterpart of IceCube-160806A
  80. Fermi GBM trigger 160810523/492525192 is not a GRB
  81. IceCube 160806A EHE Neutrino Candidate Event
  82. GRB 160806A: Fermi GBM observation
  83. Konus-Wind observation of GRB 160806A
  84. IPN Triangulation of GRB 160806A
  85. Swift Trigger 707517 is not an astrophysical event
  86. GRB160802A - Astrosat CZTI detection
  87. Swift Trigger 707545 is likely 4U 1850-03/GS1843-02
  88. Swift Trigger 707517 is probably not a GRB
  89. GRB 160804A: RATIR Optical and NIR Observations
  90. GRB 160802A: CALET Gamma-Ray Burst Monitor detection
  91. IceCube-160731A: Konus-Wind limits
  92. GRB 160804A: TSHAO optical observations
  93. GRB 160804A: ISON/UAFO optical observations
  94. GRB 160804A: GROND observations
  95. GRB 160804A: VLT/X-shooter redshift
  96. Search for counterpart to IceCube-160731A with ANTARES
  97. GRB 160804A: SAO RAS optical observations
  98. GRB 160804A: TNG optical observations, afterglow fading and candidate host galaxy
  99. GRB 160804A: Fermi GBM observation
  100. GRB160804A: MASTER-SAAO 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