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"

16306 results found.

  1. GRB 170428A: DCT Imaging
  2. GRB 170428A: TAROT La Silla observatory optical observations
  3. GRB 170428A: GROND detection of the afterglow
  4. GRB 170428A: Swift/UVOT Upper Limits
  5. GRB 170428A: Xinglong 2.16-m upper limit and host galaxy candidate
  6. GRB 170428A: MASTER-OAFA early optical observations
  7. Swift trigger 750096 - OT candidate
  8. GRB170426.95 MASTER-Net OT detection
  9. GRB 170424A: LCO Observations
  10. GRB 170419A: Swift/UVOT Upper Limits
  11. GRB 170419A: LCO Observations
  12. Swift Trigger 748858: AbAO and TSHAO optical observations
  13. Swift Trigger 748858: TAROT La Silla observatory optical observations
  14. Swift Trigger 748858: RATIR Optical and NIR Observations
  15. GRB 170419B: Zadko observatory - Gingin optical observations
  16. GRB 170419A: Zadko observatory - Gingin optical observations
  17. Swift trigger 748858: Swift BAT, XRT, and UVOT refined analysis
  18. Swift Trigger 748858: MASTER-OAFA early optical observations
  19. Swift Trigger 748858: Zadko observatory - Gingin optical observations
  20. GRB 170409A: TAROT Reunion observatory optical observations
  21. GRB 170405A: SMARTS optical/IR afterglow observations
  22. GRB 170317A: SAO RAS optical observations
  23. GRB 170405A: Etelman observatory optical observations
  24. GRB 170405A: RATIR Optical and NIR Observations
  25. GRB 170405A: LCO FTN observations
  26. GRB 170405A: ISON/Terskol optical observations
  27. GRB 170405A: Watcher optical detection
  28. GRB 170405A: TAROT Reunion observatory optical observations
  29. GRB 170405A: NOT optical observations
  30. GRB 170405A: Swift detection of a burst with an optical counterpart
  31. GRB 170325A: optical observations, possible OT/host detection
  32. DOAO 1m telescope V, R, I observation of GRB 170317A
  33. GRB 170331A: Swift/UVOT Upper Limits
  34. GRB 170318A: KAIT Optical Upper Limit
  35. GRB 170317A: Mondy optical observations
  36. GRB 170318B: RATIR Optical and NIR Observations
  37. GRB 170317A: RATIR Optical and NIR Observations
  38. GRB 170318B: Swift/UVOT Upper Limits
  39. GRB 170318A: RATIR Optical and NIR Observations
  40. GRB 170318A: Swift/UVOT Upper Limits
  41. GRB 170317A: RATIR Optical and NIR Observations
  42. IceCube-170312A: MASTER follow-up observations
  43. GRB 170317A: LCO FTN observations
  44. GRB 170317A: MITSuME Okayama Optical Observation
  45. LIGO/Virgo G275404: P200/DBSP Classification of iPTF Candidates
  46. LIGO/Virgo G277583: P200/DBSP Classification of ATLAS Candidates
  47. GRB 170317A: Mondy optical observations
  48. GRB 170317A: GMG observation
  49. GRB 170317A : Xinglong TNT optical observation
  50. GRB 170317A: ISON-Ussuriysk aferglow confirmation
  51. GRB 170317A: Swift detection of a burst with an optical counterpart
  52. LIGO/Virgo G277583: ATLAS17cck is likely a minor planet
  53. LIGO/Virgo G270580: optical observations and classification of PS and MASTER sources
  54. LIGO/Virgo G275697: GRAWITA NOT optical observations of Swift/XRT Source 23
  55. GRB 170311A: Swift/UVOT Upper Limits
  56. SN MASTER OT J042250.16-820415.4 is the possible optical counterpart of the gravitational waves event LIGO/Virgo G274296
  57. GRB 170311A: MASTER-OAFA early optical observations
  58. GRB170306A: SALT observations
  59. GRB 170306A: GROND afterglow detection
  60. Swift trigger 741567: MASTER red star flare detection
  61. GRB 170306A: Swift/UVOT Upper Limits
  62. GRB 170306A: GROND observations
  63. LIGO/Virgo G275697: Further Swift-XRT sources
  64. LIGO/Virgo G275697: P200/DBSP Classification of iPTF Candidates
  65. LIGO/Virgo G275404: P200/DBSP Classification of iPTF Candidates
  66. LIGO/Virgo G275697: Further Swift-XRT sources
  67. LIGO/Virgo G275697: Additional iPTF Optical Transient Candidates
  68. LIGO/Virgo G275404: Additional iPTF Optical Transient Candidates
  69. LIGO/Virgo G275697: optical spectroscopy of Swift/XRT source 1
  70. LIGO/Virgo G275697: iPTF Optical Transient Candidates
  71. LIGO/Virgo G275404: iPTF Optical Transient Candidates
  72. LIGO/Virgo G275404: A near-infrared transient in the error circle of AGL J1914+1043
  73. LIGO/Virgo G275697: MASTER automatic follow up detection
  74. LIGO/Virgo G275697: CNEOST optical observations
  75. LIGO/Virgo G275404: Nearby galaxy observations by J-GEM collaboration
  76. LIGO/Virgo G275697: REM optical/NIR observations
  77. LIGO/Virgo G275404: CNEOST optical observations
  78. LIGO/Virgo G275404: REM optical/NIR observations
  79. LIGO/Virgo G275404: NOT Follow-up of MASTER OT
  80. LIGO/Virgo G274296: MASTER new OT
  81. GRB 170222A: Swift-XRT observations
  82. LIGO/Virgo G274296: J-GEM optical/NIR follow-up observations
  83. LIGO/Virgo G274296: iPTF Optical Transient Candidates
  84. LIGO/Virgo G274296: Kanata 1.5m optical spectroscopy of MASTER optical transient
  85. LIGO/Virgo G274296: Global MASTER Net PSN and QSO detection
  86. LIGO/Virgo G274296: Asiago 1.82m Optical Observations
  87. LIGO/Virgo G274296: MASTER new bright possible SN detection and inspection dinamic
  88. LIGO/Virgo G274296: Optical Observation
  89. LIGO/Virgo G274296: CNEOST imaging coverage and an optical transient
  90. LIGO/Virgo G274296: SWASP optical imaging coverage
  91. LIGO/Virgo G274296: REM optical/NIR observations
  92. GRB 170214A: Mondy optical upper limit
  93. GRB 170214A: VLT/X-shooter spectroscopy and tentative redshift
  94. GRB170214A: RATIR Optical and NIR Afterglow Confirmation
  95. GRB 170214A: GROND detection in all bands
  96. GRB 170214A: NOT optical afterglow confirmation
  97. GRB 170214A: Swift/UVOT Upper Limits
  98. GRB170214A: RATIR Optical and NIR Observations
  99. GRB 170209A: GROND confirmation of MASTER afterglow
  100. GRB 170208B: SMARTS optical/IR 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