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"

12400 results found.

  1. SGR 1935+2154: AMI 15 GHz upper limits of the magnetar during outburst
  2. GRB 160625B: VLT/X-shooter redshift
  3. GRB 160625A: Swift/UVOT Upper Limits
  4. Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
  5. GRB 160624A: Swift/UVOT Upper Limits
  6. GRB 160623A: MITSuME Ishigakijima Optical Observation
  7. GRB 160624A: MITSuME Ishigakijima upper limits
  8. GRB 160623A: Swift/UVOT Upper Limits
  9. GRB 160525B: 15 GHz upper limits from AMI
  10. GRB 160521B: 15 GHz upper limits from AMI
  11. GRB 160624A: Swift detection of a short burst
  12. GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
  13. Trigger 701182: Swift detection of SGR 1935+2154
  14. GRB 160622A: Swift detection of a possible short GRB or a new SGR
  15. GRB 160612A: Swift-XRT observations
  16. GRB 160521A: 15 GHz detections and upper limit from AMI
  17. GRB 160519A: 15 GHz upper limits from AMI
  18. GRB 160509A: 15 GHz upper limits from AMI
  19. GRB 160611A: Swift/UVOT observations
  20. GRB160611.9 MASTER-Net OT detection
  21. Trigger 689956: Swift detection of a source near the Galactic center
  22. GRB 160607A: Swift/UVOT Upper Limits
  23. GRB 160504A: 15 GHz upper limits from AMI
  24. GRB 160417A: 15 GHz upper limits from AMI
  25. GRB 160408A: 15 GHz upper limits from AMI
  26. GRB 160607A: Swift detection of a bright burst
  27. Trigger 689353: Swift detection of a transient near Sgr A*
  28. GRB 160601A: Swift/UVOT Upper Limits
  29. GRB 160601A: MITSuME Akeno optical upper limits
  30. GRB160601A: Kanata Telescope I- and Ks-bands upper limits
  31. GRB 160601A: MITSuME Okayama Ks-band upper-limit
  32. GRB 160530A: Swift follow-up and X-ray afterglow candidate
  33. GRB 160601A: MITSuME Okayama upper limits
  34. GRB 160601A: MASTER-Net observations
  35. Konus-Wind observation of GRB 160530A
  36. GRB 160525B: MITSuME Akeno optical upper limits
  37. GRB 160525B: Mondy optical upper limit
  38. GRB 160525B: Khureltogot optical upper limit
  39. GRB 160525B: Nanshan optical upper limit
  40. GRB 160525B: Swift/UVOT Detection
  41. GRB 160327A: 15 GHz upper limits from AMI
  42. GRB 160321A: 15 GHz upper limits from AMI
  43. GRB 160314A: 15 GHz upper limits from AMI
  44. GRB 160313A: 15 GHz upper limits from AMI
  45. GRB 160521B: Swift/UVOT Upper Limits
  46. GRB 160521B: Swift-XRT observations
  47. Another Swift detection of SGR 1935+2154 (trigger #687124)
  48. Swift detection of SGR 1935+2154
  49. SGR 1935+2154: AbAO optical upper limit
  50. Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
  51. Trigger 686443: Swift detection of SGR 1935+2154
  52. Interplanetary Network Search for IceCube 160427A
  53. GRB 160509A: Further Swift/UVOT Observations
  54. GRB 160509A: MAXI/GSC refined analysis
  55. GRB 160509A: Swift/UVOT Upper Limit
  56. GRB 160509A: optical observations
  57. Correction to GCN 19404; GRB 160509A: MAXI/GSC detection
  58. GRB 160227A: MAXI/GSC detection
  59. LIGO/Virgo G211117: Astrosat CZTI upper limits
  60. GRB 160506A: IRSF upper limits
  61. GRB 160506A: Swift/UVOT Upper Limits
  62. GRB 160506A: GROND upper limits
  63. GRB 160506A: Swift detection of a burst
  64. GRB 160504A: RATIR Optical and NIR Observations
  65. GRB 160504A: Swift/UVOT Upper Limits
  66. GRB 160504A: Bassano Bresciano Observatory upper limits
  67. GRB 160504A: NOT upper limits
  68. VERITAS rapid follow-up observations of IceCube event 160427A
  69. GRB 160501A: GROND Upper limits
  70. GRB 160501A: MITSuME Okayama upper limits
  71. GRB 160501A: UKIRT near-IR upper limits
  72. GRB 160501A: Swift/UVOT Upper Limits
  73. GRB 160501A: RATIR Optical and NIR Observations
  74. GRB 160501A MASTER-NET early observations
  75. GRB 160501A: NOT optical and NIR observations
  76. GRB 160501A: Swift detection of a burst
  77. GRB 160422A: XRT Afterglow Confirmation
  78. GRB 160425A: Swift/UVOT Detection
  79. GRB 160425A: GROND observation
  80. Konus-Wind observation of GRB 160424A
  81. GRB 160424A: Swift/UVOT Upper Limit
  82. GRB 160417A: Swift/UVOT Detection
  83. GRB 160417A: MITSuME Okayama upper limits
  84. GRB 160412A: GROND upper limits
  85. Konus-Wind observation of GRB 160409A
  86. GRB 160410A: TLS Tautenburg observations
  87. GRB 160412A: Swift/UVOT Upper Limits
  88. GRB 160409A: Swift-XRT observations
  89. GRB 160412A: Swift detection of a burst
  90. GRB 160408A: 6.0 GHz VLA upper limit
  91. GRB 160411A: GROND Optical/NIR upper limits
  92. GRB 160411A: Swift/UVOT Upper Limits
  93. GRB 160410A: UKIRT near-IR upper limits
  94. Konus-Wind observation of GRB 160410A (short/hard)
  95. GRB 160410A: MITSuME Akeno optical upper limits
  96. GRB 160411A: MASTER-NET early optical observations.
  97. GRB 160410A: Swift/UVOT Detection
  98. GRB 160408A: TLS Tautenburg observations
  99. GRB 160408A: Swift/UVOT Upper Limits
  100. GRB 160401A: Swift-XRT 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