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"

24537 results found.

  1. GRB 150127B: Fermi GBM detection
  2. Konus-Wind observation of GRB 150127B
  3. GRB 150123A: MASTER inspection
  4. IPN Triangulation of GRB 150127B
  5. IPN Triangulation of GRB 150127A
  6. GRB 150127A: Fermi-LAT detection
  7. GRB150127A: Fermi GBM Detection
  8. GRB 150126A: Fermi GBM Detection
  9. GRB 150126A: MAXI/GSC afterglow candidate detection
  10. Konus-Wind observation of GRB 150123A
  11. GRB 150123A: Swift/UVOT observations
  12. GRB 150123A: Swift-XRT observations
  13. Konus-Wind observation of GRB 150118B
  14. IPN Triangulation of GRB 150118B (long/intense)
  15. GRB 150120B: FTN early optical light curve
  16. GRB150120B: Xinglong TNT optical observation
  17. GRB 150120B: Additional P60 observations
  18. GRB 150101B: Confirmation of a fading optical counterpart
  19. GRB 150120A: KAIT Optical Upper Limit
  20. GRB 150120B: MITSuME Okayama upper limits
  21. GRB 150120B: Swift-BAT refined analysis
  22. GRB 150120A: Swift-BAT refined analysis
  23. GRB 150118C: Fermi GBM Detection
  24. Konus-Wind observation of GRB 150118C
  25. IPN triangulation of GRB 150118C (short/hard)
  26. GRB 150101B/Swift J123205.1-105602, deep VLT observations
  27. GRB 150120A: Fermi GBM observation
  28. GRB 150120B: Swift detection of a burst
  29. GRB 150120A: P60 optical observations
  30. GRB 150120A: Swift detection of a possibly-short burst
  31. GRB 150118B: Fermi GBM Detection
  32. GRB 150118B: Fermi-LAT detection
  33. Trigger 626581: Swift detection of GRO J1008-57
  34. The Swift Detection of a Large Flare from the RS CVn Binary SZ Psc
  35. GRB 150110C: Swift-XRT observations
  36. GRB 150110B: Swift-BAT refined analysis
  37. GRB 150110B: Fermi GBM Detection
  38. GRB 150110A: Fermi GBM Detection
  39. GRB 150105A: Fermi GBM detection
  40. GRB 150103A: MASTER optical observations
  41. GRB 150101B: Fermi GBM detection
  42. GRB 150103A: Swift-BAT refined analysis
  43. Swift J123205.1-105602: Magellan candidate afterglow
  44. GRB 150103A: Swift detection of a burst
  45. Swift J123205.1-105602: XRT and UVOT observations of soft short burst source
  46. GRB 150101A Swift-BAT refined analysis of the short hard burst
  47. GRB 150101A: Fermi GBM detection
  48. GRB 150101A: Swift detection of a short burst
  49. Konus-Wind observation of GRB 141229A
  50. GRB 141229A: Deep MASTER inspection
  51. GRB 141230A: Fermi GBM detection
  52. GRB 141229A Swift-BAT observations
  53. GRB 141230A: iPTF Optical Observations and Candidate Afterglow iPTF14jko
  54. GRB 141229A: Swift-XRT observations
  55. GRB 141229A: Fermi GBM detection
  56. GRB 141225A: MASTER-SAAO OT light curve
  57. GRB 141225A: MITSuME Okayama upper limits
  58. GRB 141225A: Fermi GBM detection
  59. GRB 141225A: very early T60 observations
  60. GRB 141225A: Swift-BAT refined analysis
  61. GRB 141225A: MASTER-SAAO first OT detection
  62. Konus-Wind observation of GRB 141222A
  63. GRB 141222A: First MASTER-SAAO optical observation
  64. IPN Triangulation of GRB 141222A (very intense)
  65. GRB 141221A: MITSuME Akeno upper limits
  66. GRB 141221A: Continued Skynet PROMPT-CTIO observations
  67. GRB 141222A: Fermi GBM detection
  68. GRB 141222A: Fermi-LAT detection
  69. GRB 141221A: Fermi GBM observation
  70. GRB 141220A: MITSuME Akeno upper limits
  71. GRB 141221A: Swift-XRT refined Analysis
  72. GRB 141221A: Swift-BAT refined analysis
  73. GRB 141221A: Skynet PROMPT-CTIO observations of the optical afterglow
  74. GRB 141221A: LCOGT-McDonald optical afterglow observations
  75. Konus-Wind observation of GRB 141220A
  76. GRB 141220A: Fermi GBM observation
  77. GRB 141220A: MITSuME Okayama upper limits
  78. GRB 141220A: Swift-XRT refined Analysis
  79. GRB 141220A: Swift-BAT refined analysis
  80. GRB 141207A: Suzaku WAM observation of the prompt emission
  81. GRB 141202A: Suzaku WAM observation of the prompt emission
  82. GRB 141215A: Swift-XRT observations
  83. GRB 141215A: Fermi GBM detection
  84. Konus-Wind observation of GRB 141215A
  85. IPN Triangulation of GRB 141215A (long/intense)
  86. GRB 141212B: MITSuME Akeno upper limits
  87. Konus-Wind observation of GRB 141212B
  88. GRB 141212B: Swift-BAT refined analysis
  89. GRB 141212A: Swift-BAT refined analysis
  90. GRB 141212A: MITSuME Okayama upper limits
  91. GRB141212A: xinglong TNT upper limit
  92. GRB 141212B: Swift/XRT preliminary localization
  93. GRB 141212A: MASTER early optical observations
  94. GRB 141212A: Skynet R-COP Observations
  95. GRB 141212A: MITSuME Akeno upper limits
  96. GRB 141212A: Swift detection of a short burst
  97. GRB 141121A: further VLA observations
  98. Konus-Wind observation of GRB 141207A
  99. GRB141208.63: MASTER OT Detection During the Fermi Error Box inspection
  100. GRB 141207A: Fermi GBM detection

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