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"

3059 results found.

  1. GRB 190114C: MASTER 4-polarizations filters OT detection
  2. GRB 190114C: MASTER afterglow Detection
  3. GRB 190114C: Swift detection of a very bright burst with a bright optical counterpart
  4. GRB 190106A: GMG continued observation
  5. GRB 190109B: COATLI Optical Observations
  6. GRB 190109A: Swift-BAT refined analysis
  7. GRB 190109B: Swift-XRT observations
  8. GRB 190109B: Swift detection of a burst
  9. GRB 190106A : continued TSHAO optical observations
  10. GRB 190106A: NEXT-0.6m and Xinglong-2.16m photometric single powerlaw decay
  11. GRB 190106A: Swift-BAT refined analysis
  12. IceCube-190104A: MASTER optical observation
  13. GRB 190103B: Swift-BAT refined analysis
  14. Swift Trigger 880127 is not a GRB
  15. GRB 181222B: Global MASTER Net observations of the short bright Fermi GRB error box.
  16. GRB 181213A: Mondy optical observations
  17. GRB 181213A:Insight-HXMT/HE detection
  18. GRB 181213A: Swift detection of a burst
  19. GRB 181201A: continued optical observations in Mondy
  20. GRB 181202A: Swift/UVOT Detection
  21. GRB 181202A: Global MASTER-Net optical observations
  22. GRB 181202A: Enhanced Swift-XRT position
  23. GRB 181202A: Swift detection of a burst with an optical counterpart
  24. GRB 181201A MASTER-Net OT continued observation
  25. Short-duration GRB 181121.4: MASTER-Tavrida possible OT detection near the PGC galaxy during large Fermi error box inspection
  26. GRB 181126A: Swift-BAT refined analysis
  27. GRB 181123B: Keck further near-infrared imaging
  28. Konus-Wind observation of GRB 181121A
  29. Fermi GRB 181105.31: Global MASTER Net optical observations
  30. GRB 181103A: Swift/UVOT Detection
  31. GRB 181026A: AstroSat CZTI detection
  32. IPN Triangulation of GRB 181028A (long)
  33. Konus-Wind observation of GRB 181020A
  34. GRB 181008B: Global MASTER Net optical inspection
  35. GRB 181010A: Swift detection of a burst with an optical counterpart
  36. GRB 181003A: Swift-BAT refined analysis
  37. GRB 181003A: Swift-XRT afterglow detection
  38. GRB 181003A: LCO Cerro Tololo observations
  39. GRB 181003A: Swift-XRT observations
  40. GRB 180914B: GOTO optical detection
  41. IPN Triangulation of GRB 180914A (long)
  42. GRB 180914A: MASTER automatic inspection
  43. GRB 180905A: Swift detection of a burst
  44. Konus-Wind observation of GRB 180828A
  45. GRB 180828A: AstroSat CZTI detection
  46. GRB 180829A/MAXI J0406-019: MAXI/GSC detection
  47. GRB 180828A: Fermi GBM observation
  48. GRB 180828A: Swift detection of a GRB or possible Galactic Transient Swift J1754.9-2548
  49. IPN Triangulation of GRB 180824A (short)
  50. GRB 180809A: MAXI/GSC detection
  51. GRB 180806.94: MASTER possible OT detection in Fermi GMB trigger 555287944 error box
  52. GRB 180728B: MASTER optical observations short GRB IPN error box
  53. GRB 180728A: Swift-BAT refined analysis
  54. GRB 180728A: Swift-XRT observations
  55. GRB 180727A: Swift-BAT refined analysis
  56. GRB 180720C: MASTER optical observation
  57. GRB 180720B: Swift-BAT refined analysis
  58. GRB 180720C: Swift detection of a burst or possible Galactic Transient
  59. GRB 180720B: Kanata 1.5m optical/NIR observation
  60. GRB 180718A: MASTER optical observation
  61. GRB 180718A: Fermi GBM detection
  62. GRB 180718A short GRB detected by IPN and found in ground analysis of BAT data
  63. GRB 180715A: Swift-XRT observations
  64. Konus-Wind observation of GRB 180703B
  65. GRB 180704A: Swift-BAT refined analysis
  66. GRB 180704A: Enhanced Swift-XRT position
  67. GRB 180704A: Swift-XRT observations
  68. GRB 180626C / Fermi trigger 551697835: MASTER inspection
  69. GRB 180626A: Swift-BAT refined analysis
  70. Konus-Wind observation of GRB 180620B
  71. GRB 180620B: Swift-BAT refined analysis
  72. GROND observations of GRB 180620B
  73. GRB 180620B: Enhanced Swift-XRT position
  74. GRB 180620B: Swift detection of a burst with an optical counterpart
  75. GRB 180614A: 1.5m OSN I-band observation
  76. GRB 180614A: MASTER observation
  77. GRB 180614A: Enhanced Swift-XRT position
  78. GRB 180614A: Swift detection of a burst
  79. IPN Triangulation of GRB 180529A (short/hard)
  80. IPN Triangulation of GRB 180526A (long)
  81. GRB 180505A: AstroSat CZTI detection
  82. GRB 180505A: Fermi GBM detection
  83. GRB 180425A: Enhanced Swift-XRT position
  84. GRB 180425A: Swift detection of a burst
  85. GRB 180418A: Swift detection of a short burst
  86. GRB 180402A: Swift detection of a possibly short burst
  87. GRB 180331A: Swift-BAT refined analysis
  88. GRB 180329B: Swift-BAT refined analysis
  89. Swift Trigger 819863 is not a GRB
  90. Konus-Wind observation of GRB 180316A
  91. GRB 180316A: Swift detection of a burst
  92. GRB 180314A: Swift-BAT refined analysis
  93. IPN Triangulation of GRB 180223A (long)
  94. GRB180205A: Optical observations with DOAO 1m telescope
  95. LIGO/Virgo G298048 GRAWITA: VST-ESO PARANAL follow up of AT2017gfo
  96. GRB 180115A: Swift-BAT refined analysis
  97. GRB 180116A: MAXI/GSC detection
  98. GRB 180113A: KAIT Optical Observations
  99. GMRT Radio detection of GRB 171205A
  100. GRB 171212A: Swift detection of a burst or a Galactic transient

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