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"

41780 results found.

  1. GRB 140318A: Swift/UVOT Upper Limits
  2. GRB 140318A: Swift-BAT refined analysis
  3. GRB 140311B: Mondy optical limit
  4. GRB 140311A: Mondy optical limits
  5. GRB 140318A: Swift-XRT refined Analysis
  6. GRB 140318A: Liverpool Telescope optical observations
  7. GRB 140318A: RATIR Optical and NIR Detections
  8. GRB140318A: Discovery Channel Telescope Optical Detection
  9. GRB 140318A: WHT spectroscopy
  10. GRB 140318A: NOT detection of the afterglow
  11. GRB 140318A: Swift detection of a burst
  12. GRB 140311A: VLA Detection
  13. GRB140308A: Suzaku WAM observation of the prompt emission
  14. GRB 140311C: MASTER optical observations
  15. GRB 140311C: Swift-XRT and UVOT observations
  16. GRB 140311C: MASTER before, during and after trigger optical observations
  17. GRB 140311A: further NOT observations
  18. GRB 140311B: Swift-BAT refined analysis
  19. GRB 140311A: RATIR Optical and NIR Detection
  20. GRB 140311C: Fermi GBM Detection
  21. GRB 140311A: Montarrenti Observatory optical upper limit
  22. GRB 140311B: Fermi GBM Detection
  23. GRB 140311A: Kottamia I-band observation
  24. GRB 140311A: Swift/UVOT Upper Limits
  25. GRB 140311B: Swift/UVOT Upper Limits
  26. Fermi416242156: possible iPTF counterpart
  27. GRB 140311B: RATIR Optical and NIR Observations
  28. GRB 140311A: Bassano Bresciano Observatory optical upper limit
  29. GRB 140311A: Swift-XRT refined Analysis
  30. GRB 140311A: Gemini-North redshift
  31. GRB 140302A: GROND confirmation of the afterglow
  32. GRB 140311A: NOT redshift confirmation
  33. GRB 140311B: Swift-XRT refined Analysis
  34. GRB 140311A: Swift-BAT refined analysis
  35. GRB 140311A: Gemini-South redshift
  36. GRB 140311B: final MASTER OT light curve
  37. GRB 140311A: Enhanced Swift-XRT position
  38. GRB 140311A: Recalibration of photometry of OT detected with Kottamia 188cm telescope
  39. GRB 140311A: Nanshan afterglow decay
  40. GRB 140311B: TAROT Calern observatory optical observations
  41. GRB 140311A: Optical follow-up observation with Kottamia 188cm telescope
  42. GRB 140311A: NOT observations of the optical afterglow
  43. GRB 140311A: Zadko observatory - Gingin optical observations
  44. GRB140311B: Swift/XRT position
  45. GRB 140311B: Nanshan afterglow detection
  46. GRB 140311B: MASTER early optical observations
  47. GRB 140311A: Nanshan OT detection
  48. GRB 140311A: MASTER early optical observations
  49. GRB 140311B: Swift detection of a burst
  50. GRB 140311A: Swift detection of a probable burst
  51. Konus-Wind observation of GRB 140308A
  52. GRB 140304A: Suzaku WAM observation of the prompt emission
  53. GRB 140306A: Suzaku WAM observation of the prompt emission
  54. Konus-Wind observation of GRB 140306A
  55. IPN Triangulation of GRB 140306A
  56. GRB 140304A: Continued RATIR Optical and NIR Observations
  57. GRB 140304A: 10.4m GTC refined redshift z = 5.283
  58. GRB 140306A: Fermi GBM detection
  59. GRB 140305A: Swift-BAT refined analysis
  60. GRB 140304A: MASTER OT light curve
  61. GRB 140304A: CARMA 3mm detection
  62. GRB 140304A: VLA Detection
  63. GRB 140305A: Swift detection of a burst
  64. GRB 140304A: RATIR g-band Dropout
  65. GRB 140304A: Swift-BAT refined analysis
  66. GRB 140304A: Swift-XRT refined Analysis
  67. GRB 140304A: Redshift from the NOT
  68. GRB 140304A: Fermi GBM detection
  69. GRB 140304A: 10.4m GTC redshift z = 5.39
  70. GRB 140304A: NOT observations and redshift estimate
  71. GRB 140304A: Swift/UVOT Upper Limits
  72. iPTF14yb: JVLA and CARMA observations
  73. GRB 140304A: Khureltogot optical observations
  74. GRB 140304A: Mondy optical observations
  75. GRB 140304A: Afterglow decay from Nanshan observations
  76. GRB 140304A: Swift detection of a burst
  77. GRB 140304A: MASTER OT detecton
  78. GRB 140301A: Swift/UVOT Upper Limits
  79. GRB 140302A: Swift/UVOT Upper Limits
  80. GRB 140302A: MITSuME Okayama upper limits
  81. GRB140302A: Fermi GBM detection
  82. GRB 140302A: Swift-XRT refined Analysis
  83. GRB 140302A: Swift-BAT refined analysis
  84. GRB 140301A: Swift-BAT refined analysis
  85. GRB 140301A: Swift-XRT refined Analysis
  86. GRB 140301A: GROND Detection of the Optical/NIR Afterglow
  87. GRB 140302A: GROND afterglow candidate
  88. GRB 140302A: Swift detection of a burst
  89. GRB 140301A: VLT/X-shooter redshift
  90. GRB 140301A: NOT afterglow candidate
  91. GRB 140301A: Skynet R-COP Observations
  92. GRB 140301A: Swift detection of a burst
  93. GRB 140226A/iPTF14yb: 1.23m CAHA observations
  94. GRB 140226A/iPTF14yb: Swift/UVOT Observations
  95. GRB 140226A/iPTF14yb: Mondy optical observations
  96. GRB 140226A/iPTF14yb: RATIR Optical and NIR Observations
  97. GRB 140226A / iPTF14yb: Swift-XRT confirms a fading X-ray source
  98. GRB 140219A: Mondy optical observations of XRT source #5
  99. Konus-Wind observation of GRB 140226A
  100. IPN triangulation of GRB 140226A, a possible GRB counterpart to iPTF14yb

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