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"

16272 results found.

  1. GRB 140814A: MASTER optical follow-up inspection
  2. GRB 140808A / iPTF14eag optical follow-up at HCT
  3. GRB 140808A: Confirmation of the Swift-XRT afterglow
  4. GRB140809A: Fermi GBM observation
  5. GRB 140809A : Virtual Telescope optical observations
  6. GRB 140808A: Swift/UVOT Upper Limits
  7. GRB 140808A: Redshift from the 10.4m GTC telescope
  8. GRB 140808A: Swift-XRT observations
  9. GRB 140808A: optical afterglow candidate iPTF14eag
  10. GRB 140801A: AAO optical observations
  11. GRB 140801A: GROND Afterglow detection, unbroken decay
  12. GRB 140801A: BTA confirmation of redshift
  13. GRB 140801A: Swift/UVOT Upper Limits
  14. GRB 140801A: Swift-XRT observations
  15. GRB 140801A : Virtual Telescope optical observations
  16. GRB 140801A: Fermi GBM observation
  17. GRB 140801A: NOT afterglow confirmation
  18. IPN triangulation of GRB 140801A (Fermi trigger 428612396)
  19. GRB 140801A: archival upper limits on the host galaxy
  20. GRB 140709B: TShAO optical upper limit
  21. GRB 140730A: Swift/UVOT Upper Limits
  22. GRB 140729A: iPTF optical upper limit
  23. GRB 140723A: LCO-Sutherland optical candidate retraction
  24. GRB 140723A: MASTER optical observation
  25. GRB 140723A: LCO-Sutherland optical candidate
  26. GRB 140709B: Swift/UVOT Upper Limits
  27. GRB 140719A: Swift/UVOT Upper Limits
  28. GRB 140716A: GROND confirmation of the afterglow
  29. GRB 140719B: Zadko observatory - Gingin optical observations
  30. GRB 140716A: Swift/UVOT Upper Limits
  31. GRB 140713A: 10.4-m GTC deep optical observation
  32. GRB 140713A: Swift/UVOT Upper Limits
  33. GRB 140713A: NOT upper limits
  34. GRB 140713A : Xinglong TNT upper limit
  35. GRB 140713A: T100 observations
  36. GRB 140710A: iTelescope.Net T11 Optical Observation
  37. GRB 140709A: Continued RATIR Optical and NIR Observations
  38. GRB 140710A: Swift/UVOT Upper Limits
  39. GRB 140709B: update of Khureltogot optical upper limit
  40. GRB 140710A: RATIR Optical and NIR Observations
  41. GRB 140710A: P60 Confirmation of Afterglow
  42. GRB 140710A: GROND Detection of NIR Afterglow Candidate
  43. GRB 140709A: 10.4m GTC optical decay
  44. GRB 140709A : Virtual Telescope optical observations
  45. GRB 140709B: Khureltogot optical upper limit
  46. GRB 140709B: OSN optical limit
  47. GRB 140709A: BOOTES-2 and OSN optical observations
  48. GRB 140709B: MASTER optical observation
  49. GRB 140709A: Swift/UVOT Upper Limits
  50. GRB 140709A: RATIR Optical and NIR Observations
  51. GRB 140703A: Swift/UVOT Upper Limits
  52. GRB 140703A: AAO optical observations
  53. GRB140706A: GROND detection of the Optical/NIR afterglow
  54. GRB 140706A: Swift detection of a burst with an optical counterpart
  55. GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
  56. GRB 140705A: KAIT Optical Upper Limit
  57. GRB 140705A: MITSuME Ishigakijima upper limits
  58. GRB 140705A: MITSuME Okayama upper limits
  59. GRB 140705A: Swift/UVOT Upper Limits
  60. GRB 140629A, Optical observations
  61. GRB 140703A: VLA K-band detection
  62. GRB 140703A: CARMA 3mm detection
  63. GRB 140703A: RATIR Optical and NIR Observations
  64. GRB 140703A: Monte Agliale Observatory optical observations
  65. Correction to GCN 16507: GRB 140703A!
  66. GRB 140703A: MASTER optical observations
  67. GRB140703A: 10.4m GTC redshift
  68. GRB 140703A: BOOTES-2 and OSN optical observations
  69. GRB 140629A: MITSuME Akeno Optical observation
  70. GRB 140629A: MASTER-Net preliminary light curve
  71. GRB 140629A: SAO RAS monitoring
  72. Fermi 425667201: optical counterpart search
  73. GRB 140629A: TNG redshift confirmation
  74. GRB140629A: VATT optical observations
  75. GRB 140629A: P60 observations
  76. GRB 140629A: BTA redshift
  77. GRB 140629A: MITSuME Ishigakijima Optical Observation
  78. GRB140629A: Kanata/HOWPol optical observation
  79. GRB 140629A: NOT optical observations
  80. GRB 140629A : Virtual Telescope optical observations
  81. GRB 140629A: RTT150 optical observations
  82. GRB 140629A : Xinglong TNT optical observation
  83. GRB 140629A: MASTER OT detection
  84. GRB 140629A: Swift detection of a burst with an optical counterpart
  85. GRB 140628A: Zadko observatory - Gingin optical observations
  86. GRB 140626A: TAROT La Silla observatory optical observations
  87. GRB 140622A: TAROT La Silla observatory optical observations
  88. Swift Trigger 602668: XRT and UVOT confirm is not astrophysical source
  89. GRB 140626A: Swift/UVOT Upper Limits
  90. GRB140606B/iPTF14bfu: Keck detection of an associated supernova
  91. GRB 140620A / iPTF14cva: TShAO optical observations
  92. GRB 140623A: Swift-XRT and UVOT observations
  93. GRB 140622A: iTelescope.Net T11 Optical Observation
  94. GRB 140622A: Swift/UVOT Upper Limits
  95. Fermi 425193729 / iPTF14cyb: Discovery of optical afterglow
  96. GRB 140622A: KAIT Optical Upper Limit
  97. GRB 140620A / iPTF14cva: Konkoly optical observations
  98. GRB 140622A: RATIR Optical and NIR Observations
  99. GRB 140620A: Swift/UVOT Detection
  100. GRB 140606B / iPTF 14bfu: SAO RAS optical 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