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"

26542 results found.

  1. GRB 110402A: MITSuME Okayama and Ishigakijima Optical upper limits
  2. GRB 110328A/Swift J164449.3+573451: SARA-N detection
  3. GRB 110402A: Swift/UVOT detection of afterglow candidate
  4. GRB 110402A: Spectral lag indicates short hard burst
  5. GRB 110402A: Konkoly observations
  6. GRB 110328A: Konkoly observations.
  7. GRB 110402A: Swift-XRT refined Analysis
  8. GRB 110402A: early optical limit by "Pi of the Sky"
  9. GRB 110402A: further NOT observations
  10. GRB110328A/Swift J164449.3+573451: Fermi LAT Observations
  11. GRB 110402A: PAIRITEL NIR Upper Limits
  12. GRB 110402A: Enhanced Swift-XRT position
  13. GRB 110402A: NOT afterglow confirmation
  14. GRB 110402A: Liverpool Telescope Observations
  15. GRB 110402A: Swift detection of a burst
  16. GRB 110328A / Swift J164449.3+573451: Radio-optical/NIR Astrometry
  17. GRB 110328A / Swift J164449.3+573451: Mondy optical observations
  18. GRB 110328A / Swift J164449.3+573451: KASINICS K-band Observation
  19. GRB 110328A / Swift J164449.3+573451: X-ray analysis and a mini-blazar analogy
  20. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Detection in 2nd Epoch
  21. GRB 110328A / Swift J164449.3+573451: No optical variability of the optical counterpart
  22. GRB 110328A / Swift J164449.3+573451: BAT refined analysis
  23. GRB 110328A / Swift J164449.3+573451: Konkoly observations
  24. GRB 110328A / Swift J164449.3+573451: LOAO R-band Observation
  25. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Upper Limits
  26. GRB 110328A / Swift J164449.3+573451: optical observations
  27. GRB 110328A / Swift J164449.3+573451: optical spectroscopy from GTC
  28. GRB 110328B: Fermi GBM detection
  29. GRB 110328A / Swift J164449.3+573451: NOT optical observations.
  30. GRB / X-ray transient 110328A: MITSuME OkayamaOptical upper limits
  31. GRB 110328A / Swift J164449.3+573451: PTF Quiescent Optical Counterpart
  32. GRB 110328A: Enhanced Swift-XRT position
  33. GRB 110328A: Swift detection of a burst
  34. GRB 110319B Swift-XRT afterglow confirmation
  35. GRB 110319B BAT refined analysis
  36. GRB 110319B: Swift/UVOT Upper Limits
  37. GRB 110318B: Swift/UVOT Upper Limits
  38. GRB 110319B: GROND upper limits
  39. GRB 110319B: Swift-XRT afterglow candidate.
  40. GRB 110319B found in ground analysis of Swift-BAT data
  41. GRB 110319A: Swift/UVOT Detection
  42. GRB 110319A: Swift-XRT refined Analysis
  43. GRB 110318B: GROND upper limits
  44. GRB 110319A: Enhanced Swift-XRT position
  45. GRB 110319A: Swift detection of a burst
  46. GRB 110318B: Swift-XRT refined Analysis
  47. GRB 110318A: Fermi GBM detection
  48. GRB 110318B: Swift-BAT refined analysis
  49. GRB 110318B: Enhanced Swift-XRT position
  50. GRB 110318A: Swift-BAT refined analysis
  51. GRB 110318B: Swift/UVOT Non-Detection of an Afterglow
  52. GRB 110318B: Swift detection of a burst
  53. GRB 110318A: Swift detection of a burst
  54. GRB 110315A: RTT150 optical observations
  55. GRB 110315A: Swift/UVOT Upper Limits
  56. GRB 110315A: Swift-XRT refined Analysis
  57. GRB 110315A: Swift-BAT refined analysis
  58. GRB 110315A: Enhanced Swift-XRT position
  59. GRB 110315A: Swift detection of a burst
  60. GRB110312A: MITSuME Okayama Optical upper limits
  61. GRB 110312A: RTT150 optical observations
  62. GRB 110312A: Swift/UVOT Upper Limits
  63. GRB 110312A: Swift-XRT refined Analysis
  64. GRB 110312A: GROND Upper Limits
  65. GRB 110312A: Enhanced Swift-XRT position
  66. GRB 110312A: Swift detection of a burst
  67. GRB 110305A: REM detection of a possible NIR afterglow
  68. GRB110305A: MITSuME Ishigakijima Optical upper limits
  69. GRB 110305A: Swift/UVOT Upper Limits
  70. GRB 110305A: Swift-XRT refined Analysis
  71. GRB 110305A: Enhanced Swift-XRT position
  72. GRB 110305A: GROND Detection of Optical Afterglow
  73. GRB 110305A: Swift detection of a burst
  74. GRB 110223A: optical upper limits
  75. GRB 110301A: Fermi GBM detection
  76. Swift/UVOT observations of GRB110223A
  77. No IPN GRB detected in conjunction with candidate GRB 110215
  78. IBAS distribution of coordinates for low significance INTEGRAL GRB triggers
  79. Swift/UVOT observations of GRB110223b
  80. GRB 110223A : early optical limit by "Pi of the Sky"
  81. GRB 110223A: Liverpool Telescope observations
  82. GRB 110223A: Swift-XRT refined Analysis
  83. GRB 110223B: Swift-XRT refined Analysis
  84. GRB 110223A: Enhanced Swift-XRT position
  85. GRB 110223B: Enhanced Swift-XRT position
  86. GRB 110223B: Swift-BAT refined analysis
  87. GRB 110223B: GROND Detection of Optical Afterglow Candidate
  88. GRB 110223A: Observations from BOOTES-2
  89. GRB 110223B: Swift detection of a burst
  90. GRB 110223A: Swift detection of a burst
  91. OT 110215: Further NIR observations from NOT of the GRB candidate
  92. GRB 110213B: Swift/UVOT observations
  93. Fermi GBM detection of an SGR-like burst
  94. Swift XRT and UVOT Observations of OT 110215
  95. OT 110215: NIR observations from NOT of GRB candidate
  96. GRB 110213A: optical observations in CrAO
  97. GRB 110213B: GROND observations of the optical/NIR afterglow
  98. GRB 110213A: optical observations in Mondy
  99. OT 110215: possible GRB from 2MASS J00264184+8324093
  100. Swift/UVOT observations of GRB110210a.

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