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"

32720 results found.

  1. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Detection in 2nd Epoch
  2. GRB 110328A / Swift J164449.3+573451: No optical variability of the optical counterpart
  3. GRB 110328A / Swift J164449.3+573451: beamed emission
  4. GRB 110328A / Swift J164449.3+573451: BAT refined analysis
  5. GRB 110328A / Swift J164449.3+573451: CARMA mm detection
  6. GRB 110328A / Swift J164449.3+573451: Konkoly observations
  7. GRB 110328A / Swift J164449.3+573451: LOAO R-band Observation
  8. GRB 110328A / Swift J164449.3+573451: PAIRITEL NIR Upper Limits
  9. GRB 110328A / Swift J164449.3+573451: optical observations
  10. GRB 110328A / Swift J164449.3+573451: EVLA Detection
  11. GRB 110328B: Fermi-LAT Detection
  12. GRB 110213A, the review of the sky area in plate archives
  13. GRB 110328A / Swift J164449.3+573451: NOT optical observations.
  14. GRB 110328A/ Swift J164449.3+573451 : Xinglong TNT Upper limit
  15. GRB / X-ray transient 110328A: MITSuME OkayamaOptical upper limits
  16. GRB 110328A / Swift J164449.3+573451: PTF Quiescent Optical Counterpart
  17. GRB 110328A: a second trigger, probably a hard X-ray transient (Swift J164449.3+573451)
  18. GRB110318B : MOA optical upper limit
  19. GRB 110319B Swift-XRT afterglow confirmation
  20. GRB 101225A: revised analysis of narrow band imaging
  21. GRB 110319B BAT refined analysis
  22. GRB 110319B: Swift/UVOT Upper Limits
  23. GRB 110318B: Swift/UVOT Upper Limits
  24. GRB 110319B: GROND upper limits
  25. GRB 110319B: Swift-XRT afterglow candidate.
  26. GRB 110319A: Swift/UVOT Detection
  27. GRB 110319A: Swift-BAT refined analysis
  28. GRB 110319A: Swift-XRT refined Analysis
  29. GRB 110318B: GROND upper limits
  30. GRB 110318B: Swift-XRT refined Analysis
  31. GRB 110318A: Fermi GBM detection
  32. GRB 110318B: Swift-BAT refined analysis
  33. GRB 110318A: Swift-BAT refined analysis
  34. GRB 110315A: RTT150 optical observations
  35. GRB 110315A: Swift/UVOT Upper Limits
  36. GRB 110315A: Swift-XRT refined Analysis
  37. GRB 110315A: Swift-BAT refined analysis
  38. GRB 110315A: MASTER early optical observations
  39. GRB110312A: MITSuME Okayama Optical upper limits
  40. GRB 110312A: RTT150 optical observations
  41. GRB 110312A: Swift/UVOT Upper Limits
  42. GRB 110312A: Swift-XRT refined Analysis
  43. GRB 110312A: GROND Upper Limits
  44. GRB 110312A: Swift-BAT refined analysis
  45. GRB 110305A: REM detection of a possible NIR afterglow
  46. GRB 110305A: Swift/UVOT Upper Limits
  47. GRB 110305A: Swift-XRT refined Analysis
  48. GRB 110305A: Swift-BAT refined analysis
  49. GRB 110305A: GROND Detection of Optical Afterglow
  50. GRB 110223A: optical upper limits
  51. GRB101225A: early EVLA Observations of Christmas Burst
  52. Swift/UVOT observations of GRB110223A
  53. No IPN GRB detected in conjunction with candidate GRB 110215
  54. GRB GRB 110223A: MASTER VWF early optical observations
  55. IBAS distribution of coordinates for low significance INTEGRAL GRB triggers
  56. Swift/UVOT observations of GRB110223b
  57. GRB 110223A: Swift-BAT refined analysis
  58. GRB 110223A: Liverpool Telescope observations
  59. GRB 110223A: Swift-XRT refined Analysis
  60. GRB 110223B: Swift-XRT refined Analysis
  61. GRB 110223B: Swift-BAT refined analysis
  62. GRB 110223B: GROND Detection of Optical Afterglow Candidate
  63. GRB 101225A, the review of the sky area in plate archives
  64. GRB 110213B: Swift/UVOT observations
  65. GRB110213B: X-ray afterglow confirmation
  66. Fermi GBM detection of an SGR-like burst
  67. Swift XRT and UVOT Observations of OT 110215
  68. GRB 110213A: optical observations in CrAO
  69. GRB 110213B: GROND observations of the optical/NIR afterglow
  70. GRB 110213A: optical observations in Mondy
  71. GRB110205A: EVLA Observations
  72. Swift/UVOT observations of GRB110210a.
  73. GRB 110210A: optical upper limit
  74. GRB 110213B: Gemini South Redshift
  75. GRB 110213B: Possible Host Galaxy in SDSS Stripe 82 Imaging
  76. GRB 110210A: ROVOR Upper Limit
  77. GRB 110213A: YNAO-GMG Observations
  78. GRB 110213B: P60 Optical Afterglow Candidate
  79. GRB 110213A: TNT optical observations
  80. GRB110213A: RAPTOR Early Optical Peak and Plateau Measurements
  81. GRB 110212A: Swift XRT and UVOT observations
  82. Swift GRB110213A: interesting behaviour
  83. GRB 110213A: Fermi GBM observation
  84. GRB 110205A: Konkoly optical observations
  85. GRB 110213B: Swift XRT observation
  86. GRB 110213A: MITSuME Akeno Optical Observation
  87. Konus-Wind observation of GRB 110213A
  88. Konus-Wind observation of GRB 110213B
  89. GRB 110213A: Swift-XRT refined Analysis
  90. GRB 110213B: MAXI/GSC refined analysis
  91. GRB 110213A: Swift/UVOT refined analysis
  92. GRB 110213A: Lightbuckets Optical Observations
  93. GRB 110213A, Swift-BAT refined analysis
  94. GRB 110213A: optical observations
  95. GRB110212A: MITSuME Okayama optical upper limits
  96. GRB 110213A: KAIT observations
  97. GRB 110213A: GRAS011 optical observations
  98. GRB 110213A: Bok Telescope Redshift
  99. GRB 110213A: ROTSE-III Detection of Optical Counterpart
  100. GRB 110213A: P60 Optical Afterglow 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