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"

45714 results found.

  1. GRB 140320A: Swift-XRT detection of an afterglow candidate
  2. GRB 140320C: MASTER optical observations
  3. GRB 140320C: FTN optical observations
  4. GRB 140320C: A long GRB detected by INTEGRAL
  5. GRB 140320B: Xinglong TNT upper limit
  6. GRB 140320B: ISON-NM optical observations
  7. GRB 140320B: A long GRB detected by INTEGRAL
  8. GRB 140320B: FTN optical afterglow candidate
  9. Swift Trigger 592558 is not an astrophysical source
  10. GRB 140320A: Fermi GBM observations suggest a short GRB
  11. GRB 140320A: Swift detection of a burst
  12. GRB 140318A: Continued RATIR Optical and NIR Observations
  13. GRB 140318A: Mondy optical limit
  14. GRB 140318A: Swift/UVOT Upper Limits
  15. GRB 140318A: Swift-BAT refined analysis
  16. GRB 140311B: Mondy optical limit
  17. GRB 140311A: Mondy optical limits
  18. GRB 140318A: Swift-XRT refined Analysis
  19. GRB 140318A: Liverpool Telescope optical observations
  20. GRB 140318A: Enhanced Swift-XRT position
  21. GRB 140318A: RATIR Optical and NIR Detections
  22. GRB140318A: Discovery Channel Telescope Optical Detection
  23. GRB 140318A: WHT spectroscopy
  24. GRB 140318A: NOT detection of the afterglow
  25. GRB 140318A: Swift detection of a burst
  26. GRB 140311A: VLA Detection
  27. GRB140308A: Suzaku WAM observation of the prompt emission
  28. GRB 140311C: MASTER optical observations
  29. GRB 140311C: Swift-XRT and UVOT observations
  30. GRB 140311C: MASTER before, during and after trigger optical observations
  31. GRB 140311A: further NOT observations
  32. GRB 140311B: Swift-BAT refined analysis
  33. GRB 140311A: RATIR Optical and NIR Detection
  34. GRB 140311C: Fermi GBM Detection
  35. GRB 140311A: Montarrenti Observatory optical upper limit
  36. GRB 140311B: Fermi GBM Detection
  37. GRB 140311A: Kottamia I-band observation
  38. GRB 140311A: Swift/UVOT Upper Limits
  39. GRB 140311B: Swift/UVOT Upper Limits
  40. Fermi416242156: possible iPTF counterpart
  41. GRB 140311B: RATIR Optical and NIR Observations
  42. GRB 140311A: Bassano Bresciano Observatory optical upper limit
  43. GRB 140311A: Swift-XRT refined Analysis
  44. GRO J1744-28: Fermi GBM observation
  45. GRB 140311A: Gemini-North redshift
  46. GRB 140302A: GROND confirmation of the afterglow
  47. GRB 140311A: NOT redshift confirmation
  48. GRB 140311B: Swift-XRT refined Analysis
  49. GRB 140311A: Swift-BAT refined analysis
  50. GRB 140311A: Gemini-South redshift
  51. GRB 140311B: final MASTER OT light curve
  52. GRB 140311A: Enhanced Swift-XRT position
  53. GRB 140311B: Enhanced Swift-XRT position
  54. GRB 140311A: Recalibration of photometry of OT detected with Kottamia 188cm telescope
  55. GRB 140311A: Nanshan afterglow decay
  56. GRB 140311B: TAROT Calern observatory optical observations
  57. GRB 140311A: Optical follow-up observation with Kottamia 188cm telescope
  58. GRB 140311A: NOT observations of the optical afterglow
  59. GRB 140311A: Zadko observatory - Gingin optical observations
  60. GRB140311B: Swift/XRT position
  61. GRB 140311B: Swift-XRT observations
  62. GRB 140311B: Nanshan afterglow detection
  63. GRB 140311B: MASTER early optical observations
  64. GRB 140311A: Nanshan OT detection
  65. GRB 140311A: MASTER early optical observations
  66. GRB 140311B: Swift detection of a burst
  67. GRB 140311A: Swift detection of a probable burst
  68. Konus-Wind observation of GRB 140308A
  69. GRB 140304A: Suzaku WAM observation of the prompt emission
  70. IPN Triangulation of GRB 140308A
  71. GRB 140306A: Suzaku WAM observation of the prompt emission
  72. Konus-Wind observation of GRB 140306A
  73. IPN Triangulation of GRB 140306A
  74. GRB 140304A: Continued RATIR Optical and NIR Observations
  75. GRB 140304A: 10.4m GTC refined redshift z = 5.283
  76. GRB 140306A: Fermi GBM detection
  77. GRB 140305A: Swift-BAT refined analysis
  78. Trigger 590503: Swift-BAT triggered on noise
  79. GRB 140304A: MASTER OT light curve
  80. GRB 140304A: CARMA 3mm detection
  81. GRB 140304A: VLA Detection
  82. GRB 140305A: Swift detection of a burst
  83. GRB 140304A: RATIR g-band Dropout
  84. GRB 140304A: Swift-BAT refined analysis
  85. GRB 140304A: Swift-XRT refined Analysis
  86. GRB 140304A: Enhanced Swift-XRT position
  87. GRB 140304A: Redshift from the NOT
  88. GRB 140304A: Fermi GBM detection
  89. GRB 140304A: 10.4m GTC redshift z = 5.39
  90. GRB 140304A: NOT observations and redshift estimate
  91. GRB 140304A: Swift/UVOT Upper Limits
  92. iPTF14yb: JVLA and CARMA observations
  93. GRB 140304A: Khureltogot optical observations
  94. GRB 140304A: Mondy optical observations
  95. GRB 140304A: Afterglow decay from Nanshan observations
  96. GRB 140304A: Swift detection of a burst
  97. GRB 140304A: MASTER OT detecton
  98. GRB 140301A: Swift/UVOT Upper Limits
  99. GRB 140302A: Swift/UVOT Upper Limits
  100. GRB 140302A: MITSuME Okayama upper limits

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