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"

20963 results found.

  1. GRB 160703A: Swift/UVOT Detection
  2. GRB 160703A: Swift-XRT afterglow detection
  3. GRB 160703A: MITSuME Akeno Optical Observations
  4. GRB 160625B: RTT150 optical observations
  5. GRB 160703A: Bassano Bresciano Observatory upper limits
  6. GRB 160703A: Zadko observatory - Gingin optical observations
  7. GRB 160629A: AbAO optical observations
  8. GRB 160629A: Swift/UVOT Upper Limits
  9. GRB 160629A: Swift-XRT afterglow detection
  10. GRB 160625B: LCOGT FTN observations
  11. GRB 160629A: Global MASTER Net Prompt OT observations
  12. GRB 160629A: Swift ToO observations
  13. GRB 160630A: Skynet PROMPT-CTIO observations of the optical afterglow
  14. GRB 160630A: Zadko observatory - Gingin optical observations
  15. GRB 160630A: TAROT La Silla observatory optical observations
  16. GRB 160630A: Swift/UVOT Upper Limits
  17. GRB 160625A: GROND upper limits
  18. GRB 160630A: REM NIR observations
  19. GRB 160630A: GROND Afterglow Detection
  20. GRB 160629A: SAO RAS independent OT detection
  21. GRB 160629A: TAROT Calern observatory optical detection
  22. GRB 160625B: TSHAO optical observations, correction GCN 19619
  23. GRB 160625B: TSHAO optical observations
  24. GRB 160625B: SMARTS optical/IR afterglow observations
  25. Pi of the Sky detection of an optical flash accompanying GRB 160625B
  26. GRB 160623A: SAO RAS optical observations
  27. GRB 160625B: SAO RAS optical observations
  28. GRB 160625B: 15 GHz detection from AMI
  29. GRB 160623A: Possible detection of a radio afterglow at 15 GHz with AMI
  30. GRB 160601A: 15 GHz upper limits from AMI
  31. SGR 1935+2154: AMI 15 GHz upper limits of the magnetar during outburst
  32. GRB 160625B: VLA Detection
  33. GRB 160625B: TSHAO optical observations
  34. Konus-Wind observation of GRB 160625B
  35. GRB 160625B: Mini-MegaTORTORA detection of bright optical flash simultaneous with LAT event
  36. GRB 160625B: RATIR Optical and NIR Observations
  37. GRB 160625B: VLT/X-shooter redshift
  38. Swift Trigger 701668 is probably not an astrophysical event
  39. GRB 160625A: Swift/UVOT Upper Limits
  40. GRB 160625B: Swift/UVOT Detection
  41. GRB 160625B: RATIR Optical and NIR Afterglow Detection
  42. GRB 160625B: Fermi-LAT refined analysis
  43. GRB 160625B: Swift-XRT afterglow detection
  44. GRB 160623A: SMA submm afterglow observations
  45. GRB 160625B: Tiled Swift observations
  46. GRB 160625B: Fermi GBM initial observations
  47. GRB 160625B: Fermi-LAT detection of a bright burst
  48. GRB 160625A - two different events?
  49. GRB 160625A: Swift-XRT observations
  50. GRB 160624A: Swift/UVOT Upper Limits
  51. GRB 160623A: TSHAO optical observations
  52. GRB 160623A: Swift/UVOT Upper Limits
  53. GRB 160623A: RATIR Optical and NIR Observations, Afterglow Confirmation
  54. GRB 160525B: 15 GHz upper limits from AMI
  55. GRB 160521B: 15 GHz upper limits from AMI
  56. GRB 160623A: Mondy optical observations
  57. GRB 160623A: Swift-XRT afterglow detection
  58. GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
  59. GRB 160623A: Swift ToO observations
  60. BAT trigger 700791 (possible GRB 160622A) is SNR RCW 103
  61. LIGO/Virgo G211117/GW151226: serendipitous XMM-Newton slew observations
  62. GRB 160612A: Swift-XRT observations
  63. BAT detection and localization of GRB 160612A
  64. GRB 160612A: Swift ToO observations
  65. GRB 160521A: 15 GHz detections and upper limit from AMI
  66. GRB 160519A: 15 GHz upper limits from AMI
  67. GRB 160509A: 15 GHz upper limits from AMI
  68. GRB 160611A: Swift/UVOT observations
  69. GRB 160611A: Swift-XRT observations
  70. Swift detection of SWIFT J174540.2-290037
  71. Swift detection of SWIFT J174540.2-290037
  72. Trigger 689956: Swift detection of a source near the Galactic center
  73. GRB 160607A: Swift/UVOT Upper Limits
  74. GRB 160607A: GROND confirmation of the afterglow
  75. GRB 160504A: 15 GHz upper limits from AMI
  76. GRB 160417A: 15 GHz upper limits from AMI
  77. GRB 160408A: 15 GHz upper limits from AMI
  78. GRB 160607A: candidate optical afterglow from the NOT
  79. GRB 160530A: further Swift-XRT follow-up observations
  80. GRB 160601A: AbAO optical observations
  81. GRB 160601A: Discovery Channel Telescope Limits
  82. GRB 160601A: Swift/UVOT Upper Limits
  83. GRB 160601A: GTC observations confirming transient source decay
  84. GRB 160601A: Mondy optical observations, photometry of NOT sources
  85. GRB160601A: Kanata Telescope I- and Ks-bands upper limits
  86. GRB160601A: NOT detection of an afterglow candidate
  87. GRB 160601A: Mondy optical observations
  88. GRB 160601A: MITSuME Okayama Ks-band upper-limit
  89. GRB 160530A: Swift follow-up and X-ray afterglow candidate
  90. GRB 160601A: MASTER-Net observations
  91. GRB 160530A: discovery with the Compton Spectrometer and Imager
  92. GRB 160530A: Tiled Swift observations
  93. GRB 160525B: Swift/UVOT Detection
  94. GRB 160521B: Swift-XRT afterglow detection
  95. GRB 160521B: Theoretical estimate of the redshift and urgent need for further x-ray observations
  96. GRB 160425A: SMARTS late-time observations
  97. GRB 160327A: 15 GHz upper limits from AMI
  98. GRB 160321A: 15 GHz upper limits from AMI
  99. GRB 160314A: 15 GHz upper limits from AMI
  100. GRB 160313A: 15 GHz upper limits from AMI

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