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"

3119 results found.

  1. GRB 150123A: MASTER inspection
  2. Swift Trigger 628458 likely not astrophysical
  3. Konus-Wind observation of GRB 150118B
  4. GRB 150120B: P60 optical afterglow
  5. Swift detection of 4U 1700+24 (= V* V934 Her)
  6. GRB 141229A: MAXI/GSC detection
  7. GRB 141225A: MASTER-SAAO first OT detection
  8. GRB 141225A: Enhanced Swift-XRT position
  9. GRB 141225A: UVOT detection
  10. GRB 141225A: Optical aftergow confirmation
  11. GRB 141225A: LT optical candidate
  12. GRB 141225A: 1.23m CAHA optical observations
  13. GRB 141225A: Swift detection of a burst
  14. IPN Triangulation of GRB 141222A (very intense)
  15. GRB 141220A: Fermi GBM observation
  16. Swift detection of 4U 1700+24 (= V934 Her)
  17. GRB 141212A: MASTER early optical observations
  18. GRB 141130A: Swift/UVOT Detection
  19. GRB 141130A: Swift detection of a burst with an optical counterpart
  20. GRB 141121A: MITSuME Akeno Optical observation
  21. GRB 141121A: MAXI/GSC detection
  22. GRB 141109A: Swift-BAT refined analysis
  23. GRB 141109A: CQUEAN Detection at 0.85 - 1.05 micron
  24. GRB 141109B: Swift detection of a burst
  25. GRB 141104A: Swift-XRT observations
  26. GRB 141028A: TShAO optical observation
  27. GRB 141031B: Nanshan optical upper limit
  28. Konus-Wind observation of GRB 141017A
  29. Swift detection of outburst from 4U 1700+24
  30. GRB 140916B: iPTF Optical Observations
  31. GRB 140916A: Swift detection of a burst
  32. Fermi GBM trigger 140913075 is not a GRB
  33. GRB 140907A: T100 observations
  34. GRB 140906B: Fermi GBM Detection of a Long GRB
  35. IPN triangulation of GRB 140810A
  36. Konus-Wind observation of GRB 140810A
  37. Swift trigger 609139 is probably 4U 1850-03
  38. GRB 140723A: MASTER optical observation
  39. IPN Triangulation of GRB 140721A
  40. GRB 140716A: GROND confirmation of the afterglow
  41. GRB 140713A : Xinglong TNT upper limit
  42. GRB 140703A: MASTER optical observations
  43. GRB 140703A: BOOTES-2 and OSN optical observations
  44. Fermi 425667201: optical counterpart search
  45. GRB 140629A: KWFC z-band photometry
  46. GRB 140628A: Swift-XRT refined Analysis
  47. GRB 140620A / iPTF14cva: TShAO optical observations
  48. GRB 140620A: Swift/UVOT Detection
  49. GRB 140619B: Fermi-LAT Detection
  50. GRB 140614B: MITSuME Akeno upper limits
  51. Fermi 423717114: Additional P48 and P60 observations
  52. Konus-Wind observation of GRB 140528A
  53. IPN Triangulation of GRB 140528A
  54. Swift detection of SFXT IGR J17544-2619
  55. Swift trigger 599860 probably not real
  56. GRB 140515B: MAXI/GSC detection
  57. GRB 140515A: MITSuME Akeno upper limits
  58. Konus-Wind observation of GRB 140508A
  59. GRB 140508A: SAO RAS and MASTER photometric and spectroscopic observations
  60. GRB 140502A: MITSuME Okayama upper limits
  61. GRB 140419A: MITSuME Okayama Optical Observation
  62. Swift Trigger 595345 is not an astrophysical source
  63. GRB 140408A: MITSuME Okayama upper limits
  64. IPN Triangulation of GRB 140329A
  65. GRB 140320D: Suzaku WAM observation of the prompt emission
  66. GRB 140320A: Enhanced Swift-XRT position
  67. GRB 140320A: Swift-XRT detection of an afterglow candidate
  68. GRB 140320B: Xinglong TNT upper limit
  69. GRB 140311C: MASTER before, during and after trigger optical observations
  70. IPN Triangulation of GRB 140306A
  71. GRB 140219A: Suzaku WAM observation of the prompt emission
  72. GRB 140219A: MASTER before and after GRB observational arguments of the exceptionally Dark GRB
  73. GRB 140221A: MAXI/GSC detection
  74. GRB 140215A: Swift/UVOT Detection
  75. GRB 140215A: Swift-BAT refined analysis
  76. GRB 140215A: ISON-NM optical observations
  77. GRB 140215A: T24 optical observations
  78. GRB 140215A: Enhanced Swift-XRT position
  79. GRB 140215A: Swift detection of a burst with optical counterpart
  80. GRB 140209A: optical observations
  81. GRB 140129B: Swift/UVOT Detection
  82. GRB 140129B: MASTER OT early light curve
  83. GRB 140129B: Swift detection of a burst with an optical afterglow
  84. Fermi412093190: iPTF optical counterpart search
  85. GRB 140103A: AAO optical afterglow candidate
  86. GRB 140108A: MASTER-Net OT detection
  87. GRB 140105A/Fermi410578384: MASTER-Net early optical observations
  88. GRB140104A : Xinglong TNT observation. A bright star is located nearby
  89. GRB 140102A: Fermi/GBM Observation
  90. GRB 140102A: MAXI/GSC detection
  91. GRB 140102A: Swift-XRT refined Analysis
  92. GRB 140102A: Fermi-LAT detection of a burst
  93. Konus-Wind observation of GRB 131226A
  94. GRB 131227A: OT candidate from KAIT Optical observations
  95. GRB 131225A: MASTER-Net optical observations
  96. GRB 131226A: Swift detection of a burst
  97. GRB 131125A: iPTF upper limits on the afterglow of a short GRB
  98. GRB 131128A: AROMA-N Optical Observation
  99. IPN Triangulation of GRB 131118A
  100. GRB 131030A, 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