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"

41921 results found.

  1. Konus-Wind observation of GRB 160625B
  2. GRB 160625B: Mini-MegaTORTORA detection of bright optical flash simultaneous with LAT event
  3. GRB 160625B: RATIR Optical and NIR Observations
  4. GRB 160625B: TNG redshift confirmation
  5. GRB 160625B: VLT/X-shooter redshift
  6. GRB 160625B: MITSuME Ishigakijima Optical Observation
  7. Fermi/GBM observation of a bright burst from magnetar SGR 1935+2154
  8. GRB 160623A CALET Gamma-Ray Burst Monitor detection
  9. Swift-BAT refined analysis on the bright event from SGR 1935+2154
  10. Swift Trigger 701668 is probably not an astrophysical event
  11. IPN Triangulation of GRB 160620A (short/hard)
  12. GRB 160625A: Swift/UVOT Upper Limits
  13. GRB 160625A: Swift-BAT refined analysis
  14. GRB 160625A: Swift-XRT refined Analysis
  15. Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
  16. GRB 160625B: Swift/UVOT Detection
  17. GRB 160625B: RATIR Optical and NIR Afterglow Detection
  18. GRB 160625B: Fermi GBM refined analysis
  19. GRB 160625B: Fermi-LAT refined analysis
  20. GRB 160625B: Swift-XRT afterglow detection
  21. GRB 160623A: SMA submm afterglow observations
  22. GRB 160625B: Tiled Swift observations
  23. GRB 160625B: Fermi GBM initial observations
  24. GRB 160625B: Fermi-LAT detection of a bright burst
  25. GRB 160625A - two different events?
  26. GRB 160625A: Swift detection of a burst
  27. GRB 160624A: Swift/UVOT Upper Limits
  28. GRB 160624A: Lulin observation
  29. GRB 160623A: TSHAO optical observations
  30. GRB 160624A: Swift-XRT refined Analysis
  31. GRB 160623A: MITSuME Ishigakijima Optical Observation
  32. GRB 160624A: MITSuME Ishigakijima upper limits
  33. GRB 160624A: Fermi GBM observation
  34. GRB 160624A, Swift-BAT refined analysis
  35. GRB 160623A: Swift/UVOT Upper Limits
  36. GRB 160623A: RATIR Optical and NIR Observations, Afterglow Confirmation
  37. GRB160624A:possible GRB host redshift
  38. GRB 160525B: 15 GHz upper limits from AMI
  39. GRB 160521B: 15 GHz upper limits from AMI
  40. GRB 160623A: Mondy optical observations
  41. GRB 160624A: Swift detection of a short burst
  42. Swift detection of a dust-scattered halo around GRB 160623A
  43. GRB 160623A: Swift-XRT afterglow detection
  44. GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
  45. Trigger 701182: Swift detection of SGR 1935+2154
  46. GRB 160623A: Fermi GBM detection/observation
  47. Konus-Wind observation of GRB 160623A
  48. GRB 160623A / Galactic transient: Fermi-LAT detection
  49. GRB 160623A: Swift ToO observations
  50. SGR 1617-5103 (BAT trigger 700791): Enhanced Swift-XRT position.
  51. Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
  52. Fermi GBM Trigger 160622573 is not a GRB
  53. BAT trigger 700791 (possible GRB 160622A) is SNR RCW 103
  54. GRB 160622A: Swift detection of a possible short GRB or a new SGR
  55. More FERMI GBM bursts from the magnetar SGR 1935+2154
  56. SGR 1935+2154: MAXI/GSC detection
  57. Fermi GBM trigger 488128598/160620637 is not a GRB
  58. Fermi GBM trigger 487974449/160618852 is not a GRB
  59. LIGO/Virgo G211117 / GW151226: Sky maps and other data available in LOSC
  60. LIGO/Virgo G197392 / LVT151012: Sky maps and other data available in LOSC
  61. LIGO/Virgo G211117/GW151226: serendipitous XMM-Newton slew observations
  62. Konus-Wind observation of GRB 160612A
  63. GRB 160612A: Swift-XRT observations
  64. BAT detection and localization of GRB 160612A
  65. GRB 160612A: Swift ToO observations
  66. IPN Triangulation of GRB 160612A (short/hard)
  67. GRB 160521A: 15 GHz detections and upper limit from AMI
  68. GRB 160519A: 15 GHz upper limits from AMI
  69. GRB 160509A: 15 GHz upper limits from AMI
  70. GRB 160612A: Fermi GBM detection
  71. GRB 160611A: Swift/UVOT observations
  72. GRB 160611A: Swift-BAT refined analysis
  73. GRB 160611A: Swift-XRT refined Analysis
  74. GRB 160611A: GCN19525 OT is known star
  75. GRB160611.9 MASTER-Net OT detection
  76. GRB 160611A: Swift-XRT observations
  77. GRB 160611A: Swift detection of a burst
  78. SWIFT J174540.2-290037, Swift-BAT refined analysis (trigger 690197)
  79. GRB 160525C: Astrosat CZTI detection
  80. GRB 160508A: Astrosat CZTI detection
  81. SWIFT J174540.2-290037, Swift-BAT refined analysis (trigger 689956)
  82. GRB 160607A CALET Gamma-Ray Burst Monitor detection
  83. Swift detection of SWIFT J174540.2-290037
  84. Swift detection of SWIFT J174540.2-290037
  85. Trigger 689956: Swift detection of a source near the Galactic center
  86. GRB 160607A: Swift/UVOT Upper Limits
  87. GRB 160607A: GROND confirmation of the afterglow
  88. Konus-Wind observation of GRB 160607A
  89. GRB 160504A: 15 GHz upper limits from AMI
  90. GRB 160417A: 15 GHz upper limits from AMI
  91. GRB 160408A: 15 GHz upper limits from AMI
  92. GRB 160607A: candidate optical afterglow from the NOT
  93. GRB 160607A: Swift-BAT refined analysis
  94. Trigger 689353 (possible transient near Sgr A*), Swift-BAT refined analysis
  95. GRB 160607A: Swift-XRT refined Analysis
  96. GRB 160607A: Swift detection of a bright burst
  97. GRB 160530A: further Swift-XRT follow-up observations
  98. Fermi GBM trigger 486907024/160606498 is not a GRB
  99. Trigger 689353: Swift detection of a transient near Sgr A*
  100. GRB 160601A: AbAO 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