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"

43892 results found.

  1. Refined IPN Triangulation of GRB 140906C
  2. GRB 140907A: Nishi-Harima NIR Observations
  3. GRB 140907A: Discovery Channel Telescope observations
  4. IPN Triangulation of GRB 140906C (short/hard)
  5. GRB 140907A: T100 observations
  6. GRB 140907A: Swift-BAT refined analysis
  7. GRB 140907A: Fermi GBM Detection
  8. GRB 140907A: redshift from the 10.4m GTC telescope
  9. GRB 140907A: Swift-XRT refined Analysis
  10. GRB 140907A: Enhanced Swift-XRT position
  11. GRB 140907A : Virtual Telescope optical observations
  12. GRB140907A: Swift UVOT detection
  13. GRB 140906B: Fermi GBM Detection of a Long GRB
  14. GRB 140907A : Optical observations from Nanshan
  15. GRB 140907A: Swift detection of a burst with an optical counterpart
  16. GRB 140906A - Fermi GBM Detection
  17. GRB 140906A: iPTF optical transient candidates
  18. GRB 140903A: Confirmation of Optical Fading from Discovery Channel Telescope
  19. GRB 140903A: Possible optical variability
  20. GRB 140903A: NOT optical and NIR observations
  21. GRB 140901B: Swift XRT observation
  22. GRB 140903A: FTN observations
  23. GRB 140818B: TShAO optical upper limit
  24. GRB 140903A: ISON-Kislovodsk observations
  25. GRB 140903A: MAXI/GSC upper limit
  26. GRB 140903A: 6 GHz VLA detection
  27. GRB 140903A: Pan STARRS images of the field
  28. GRB 140901B: Fermi GBM detection
  29. GRB 140903A: tentative spectroscopic redshift
  30. GRB 140901B found in ground analysis of BAT data
  31. GRB 140903A: Swift/UVOT Upper Limits
  32. GRB 140903A: Swift-BAT Spectral lag analysis
  33. GRB 140903A: P60 Optical Observations
  34. GRB140903A: Discovery Channel Telescope Optical Detection
  35. GRB 140903A: Swift-BAT refined analysis
  36. GRB 140903A: Swift-XRT refined Analysis
  37. GRB 140903A: Coincident galaxy cluster in archival images
  38. GRB 140903A: Confirmed Swift detection of a short burst
  39. GRB 140903A: Preliminary Swift/XRT localization
  40. GRB 140903A: Swift detection of a possible burst
  41. GRB 140901A: Fermi GBM detection
  42. IPN Triangulation of GRB 140901A (short/hard/very intense)
  43. GRB 140831A: iPTF observations of a possible short burst detected by Fermi GBM
  44. GRB 140829A: Fermi GBM Detection
  45. GRB 140829A: iPTF optical observations
  46. GRB140818B, the review of the sky area in plate archives
  47. GRB 140828A, Swift-BAT refined analysis
  48. Konus-Wind observation of GRB 140825A
  49. GRB 140828A: Fermi GBM observation
  50. Swift Mission Operations Center Fully Operational
  51. IPN Triangulation of GRB 140825A (very intense/long)
  52. GRB 140828A: Swift detection of a burst
  53. IPN Triangulation of GRB 140824B
  54. Swift Burst Response Reenabled
  55. GRB 140818B: TLS observations
  56. GRB 140824A: optical upper limit in CrAO
  57. GRB 140824B: Swift observations
  58. Fermi TRIGGER_NUM 430645968: MASTER OT inside error box
  59. Swift Mission Operations Center Moving Tomorrow
  60. GRB 140824B: Fermi GBM Detection
  61. GRB 140821A: Fermi GBM Detection
  62. Fermi TRIGGER_NUM 430583595: MASTER OT 20 hours later
  63. Fermi TRIGGER_NUM 430583595: MASTER OT JR011101.13+603337.5 detection
  64. GRB 140824A: NOT optical upper limits
  65. GRB 140824A: OSN optical limit
  66. GRB 140824A: Swift-XRT refined Analysis
  67. GRB 140824A: Swift-BAT refined analysis
  68. GRB 140824A: Enhanced Swift-XRT position
  69. GRB 140824A: Swift/UVOT Upper Limits
  70. GRB 140824A: Swift detection of a burst
  71. GRB 140817A: NOT optical observations
  72. Fermi GBM Trigger 140819576/ 430148973/ MASTER OT
  73. GRB 140817A: Khureltogot optical upper limit
  74. GRB 140818B: ISON-Kislovodsk and ISON-Burakan optical upper limit
  75. Fermi trigger 430148973: Swift-XRT observation
  76. GRB 140818A: GROND confirmation of afterglow candidate
  77. GRB 140808A/iPTF14eag: AMI 15 GHz detection
  78. GRB140819A: Deep GROND Upper Limits
  79. Fermi 430148973/MASTER candidate: LCO-Sutherland observations
  80. Fermi trigg_num 430148973: OSN I-band observations
  81. GRB 140818B, Swift-BAT refined analysis
  82. Fermi trigg_num 430148973: bright OT inside large error box!
  83. Konus-Wind observation of GRB 140818A
  84. GRB 140818B : Correction to GCN 16713
  85. GRB 140818B: Swift/UVOT Upper Limits
  86. GRB 140818B: Swift-XRT refined Analysis
  87. Radio upper limit on the GRB 140808A with the GMRT
  88. GRB 140818B: Fermi GBM detection
  89. GRB140818B : GROND afterglow candidate
  90. GRB 140818B: Enhanced Swift-XRT position
  91. GRB 140818B: OSN I-band afterglow candidate
  92. GRB 140817A: Swift/UVOT Afterglow Detection
  93. GRB 140818B: Swift detection of a burst
  94. GRB 140818A - Fermi GBM Detection
  95. Swift detection of SAX J1712.6-3739
  96. GRB 140818A: Swift-XRT and UVOT potential afterglow detection
  97. Konus-Wind observation of GRB 140817A
  98. GRB 140818A Tiled Swift observations
  99. GRB 140818A: MAXI/GSC detection
  100. GRB 140817A: Swift-XRT refined Analysis

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