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"

41930 results found.

  1. Fermi GBM trigger 479509107/160312874 is not a GRB
  2. GRB 160313A: Chante-Perdrix Observatory optical observations
  3. GRB 160313A: MASTER-Net optical observations
  4. GRB 160313A: LT observations
  5. GRB 160313A: Swift-XRT refined Analysis
  6. GRB 160313A: TAROT Calern observatory optical observations
  7. GRB 160313A: RATIR Optical and NIR Observations
  8. GRB 160313A: SAO RAS observations
  9. GRB 160313A: Swift detection of a burst
  10. GRB 160310A: MASTER-Kislovods observations
  11. GRB 160310A: Further NOT observations
  12. GRB 160310A: Swift/UVOT Upper Limits
  13. Konus-Wind observation of GRB 160310A (possible ultra-long GRB?)
  14. GRB 160310A: RATIR Optical and NIR Observations
  15. GRB 160307A: CALET Gamma-Ray Burst Monitor detection of a possible short GRB
  16. GRB 160310A: NOT optical observations
  17. GRB 160310A: LCOGT-SAAO optical upper limits
  18. GRB 160310A: Swift-XRT observations
  19. GRB 160310A: Fermi GBM observation
  20. GRB 160303A: GTC imaging of possible host galaxy
  21. GRB 160310A: Swift ToO observations
  22. GRB 160310A: Fermi-LAT detection
  23. Swift Trigger 678197 is a noise fluctuation
  24. LIGO/Virgo G211117: HAWC follow-up of northern sky
  25. Trigger 677981: Swift detection of IGRJ17091-3624
  26. GRB 160303A: X-shooter spectroscopy
  27. Swift trigger 677890 is noise
  28. GRB 160303A: Continued optical monitoring from NOT
  29. GRB 160303A: JCMT SCUBA-2 sub-mm observation
  30. GRB160303A: further GROND observations
  31. GRB 160303A: 9.8 GHz VLA upper limit
  32. GRB 160303A, Swift-BAT refined analysis
  33. GRB 160303A: MMT Optical Detection
  34. GRB 160303A: Continued RATIR Optical and NIR Observations
  35. LIGO/Virgo G211117: GRAWITA LBT follow-up of PS15dpn
  36. GRB 160303A: GROND Optical Detection
  37. GRB 160303A: Observations from T150 OSN
  38. GRB 160303A: VLT/FORS2 afterglow obervations
  39. GRB 160303A: BOAO R-band Detection
  40. GRB 160303A: McDonald 2.1m CQUEAN Detection
  41. GRB 160303A SMA observation
  42. GRB 160303A iTelescope observation
  43. GRB 160303A: Swift-XRT refined Analysis
  44. GRB 160303A: Optical observations from the NOT
  45. Swift possibly triggered on IGR17091-3624
  46. GRB 160303A: Swift/UVOT Detection
  47. GRB 160303A: RAPTOR Observations During Gamma-Ray Emitting Interval
  48. GRB 160303A: RATIR Optical and NIR Afterglow Detection
  49. GRB 160303A: MITSuME Akeno optical upper limits
  50. GRB 160303A: LCOGT-FTN optical observations
  51. GRB 160303A: MITSuME Okayama upper limits
  52. GRB 160303A: ISON-NM early optical early limits
  53. GRB 160303A: Swift detection of a burst, possibly short
  54. GRB 160227A: LOAO 1.0m optical detection
  55. GRB 160227A: McDonald 0.8m Detection
  56. GRB 160228A: Swift/UVOT Upper Limits
  57. GRB 160227A: Swift/UVOT Detection
  58. GRB160228A: Further analyses on spectral lag and extended emission
  59. GRB 160228A: Mondy optcial observations
  60. GRB 160228A: RATIR Optical and NIR Observations
  61. GRB 160228A: MASTER-Amur prompt observations
  62. GRB 160228A: Swift-XRT refined Analysis
  63. GRB 160227A: MASTER prompt OT Detection and LC
  64. GRB 160227A: AROMA-N Optical Observation
  65. GRB 160228A: GROND Afterglow Candidate
  66. GRB 160228A: Swift-BAT refined analysis
  67. GRB 160228A: optical observations
  68. GRB 160227B: Fermi GBM detection
  69. GRB 160227A: NOT redshift
  70. GRB 160228A: Swift detection of a burst
  71. GRB 160227A, Swift-BAT refined analysis
  72. GRB 160227A: Swift-XRT refined Analysis
  73. GRB 160227A: MAXI/GSC detection
  74. GRB 160225A: TSHAO optical afterglow detection
  75. GRB 160227A: ISON-Kislovodsk optical observation
  76. GRB 160227A: Mt. Terskol observatory optical observation
  77. GRB 160227A: MASTER OT Detection
  78. GRB 160227A: Swift detection of a burst with an optical counterpart
  79. GRB 160225A: LOAO optical upper limit
  80. GRB 160225B: Fermi GBM detection
  81. IPN Triangulation of GRB 160225B
  82. GRB 160225A: Continued RATIR Optical and NIR Observations
  83. GRB 160225.81/FERMI Trigg 478121069: MASTER OT J095503.19-355149.4 detection
  84. GRB 160225A: Swift-BAT refined analysis
  85. Fermi GBM trigger 478156376/16022621 is not a GRB
  86. GRB 160225A: MASTER-Amur observations
  87. GRB 160225A: RATIR Optical and NIR Observations
  88. GRB 160225A: Swift/UVOT Upper Limits
  89. GRB 160225A: Xinglong TNT optical observation
  90. GRB 160223B: CALET Gamma-Ray Burst Monitor detection
  91. GRB 160225A: Swift-XRT refined Analysis
  92. GRB 160225A: NOT optical observations
  93. GRB 160225A: WHT LIRIS observations
  94. GRB 160225A: MITSuME Okayama Optical Observation
  95. GRB 160225A: MITSuME Akeno Optical Observation
  96. GRB 160223A: RATIR Optical and NIR Observations
  97. GRB 160225A: TSHAO optical upper limit
  98. GRB 160225A: MASTER-Amur early observations
  99. GRB 160225A: Swift detection of a burst
  100. GRB 160223A: Swift-XRT afterglow detection

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