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"

16292 results found.

  1. GRB 160625B: SAO RAS monitoring
  2. GRB 160629A: Swift-XRT afterglow detection
  3. GRB 160625B: LCOGT FTN observations
  4. GRB 160629A: Global MASTER Net Prompt OT observations
  5. GRB 160630A: Skynet PROMPT-CTIO observations of the optical afterglow
  6. GRB 160630A: Zadko observatory - Gingin optical observations
  7. GRB 160630A: TAROT La Silla observatory optical observations
  8. GRB 160629A: BTA and GTC redshift
  9. GRB 160630A: Swift/UVOT Upper Limits
  10. GRB 160630A: REM NIR observations
  11. GRB 160629A: TAROT Calern observatory optical detection
  12. GRB 160625B: TSHAO optical observations, correction GCN 19619
  13. GRB 160625B: TSHAO optical observations
  14. GRB 160625B: SMARTS optical/IR afterglow observations
  15. Pi of the Sky detection of an optical flash accompanying GRB 160625B
  16. GRB 160623A: SAO RAS optical observations
  17. GRB 160625B: Global MASTER-Net prompt optical emission detection
  18. GRB 160625B: SAO RAS optical observations
  19. GRB 160625B: VLA Detection
  20. GRB 160625B: TSHAO optical observations
  21. GRB 160625B: Mini-MegaTORTORA detection of bright optical flash simultaneous with LAT event
  22. GRB 160625B: RATIR Optical and NIR Observations
  23. GRB 160625B: TNG redshift confirmation
  24. GRB 160625B: VLT/X-shooter redshift
  25. GRB 160625B: MITSuME Ishigakijima Optical Observation
  26. GRB 160625A: Swift/UVOT Upper Limits
  27. GRB 160625B: RATIR Optical and NIR Afterglow Detection
  28. GRB 160625A - two different events?
  29. GRB 160624A: Swift/UVOT Upper Limits
  30. GRB 160623A: TSHAO optical observations
  31. GRB 160623A: MITSuME Ishigakijima Optical Observation
  32. GRB 160624A: MITSuME Ishigakijima upper limits
  33. GRB 160623A: Swift/UVOT Upper Limits
  34. GRB 160623A: RATIR Optical and NIR Observations, Afterglow Confirmation
  35. GRB 160623A: Mondy optical observations
  36. GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
  37. GRB 160611A: Swift/UVOT observations
  38. GRB160611.9 MASTER-Net OT detection
  39. Swift detection of SWIFT J174540.2-290037
  40. Swift detection of SWIFT J174540.2-290037
  41. Trigger 689956: Swift detection of a source near the Galactic center
  42. GRB 160607A: Swift/UVOT Upper Limits
  43. GRB 160607A: candidate optical afterglow from the NOT
  44. GRB 160601A: AbAO optical observations
  45. GRB 160601A: Discovery Channel Telescope Limits
  46. GRB 160601A: Swift/UVOT Upper Limits
  47. GRB 160601A: MITSuME Akeno optical upper limits
  48. GRB160601A: Gemini Imaging
  49. GRB 160601A: Mondy optical observations, photometry of NOT sources
  50. GRB160601A: Kanata Telescope I- and Ks-bands upper limits
  51. GRB160601A: NOT afterglow confirmation
  52. GRB160601A: NOT detection of an afterglow candidate
  53. GRB 160601A: Mondy optical observations
  54. GRB 160530A: Swift follow-up and X-ray afterglow candidate
  55. GRB 160601A: MITSuME Okayama upper limits
  56. GRB 160601A: MASTER-Net observations
  57. GRB 160525B: MITSuME Akeno optical upper limits
  58. GRB 160525B: Mondy optical upper limit
  59. GRB 160525B: Khureltogot optical upper limit
  60. GRB 160525B: Nanshan optical upper limit
  61. GRB 160425A: SMARTS late-time observations
  62. GRB 160521B: Swift/UVOT Upper Limits
  63. SGR 1935+2154: AbAO optical upper limit
  64. GRB 160509A MASTER-NET observations
  65. GRB 160509A: TLS Tautenburg Afterglow Detection
  66. GRB 160509A: Further Swift/UVOT Observations
  67. GRB 160509A Gemini North redshift
  68. GRB 160509A: DCT Imaging / Afterglow Confirmation
  69. GRB 160509A: VLA Detection
  70. GRB 160509A: Swift/UVOT Upper Limit
  71. GRB 160509A: optical observations
  72. GRB 160506A: TAROT La Silla observatory optical observations
  73. GRB 160506A: Swift/UVOT Upper Limits
  74. IceCube-160427A: iPTF Observations
  75. GRB 160504A: RATIR Optical and NIR Observations
  76. GRB 160504A: Swift/UVOT Upper Limits
  77. GRB 160504A: Bassano Bresciano Observatory upper limits
  78. GRB 160504A: TAROT Calern observatory optical observations
  79. ICECUBE-160427A : Pan-STARRS imaging and optical transients in the field
  80. GRB 160501A: SMARTS optical/IR observations
  81. GRB 160501A: MITSuME Okayama upper limits
  82. GRB 160501A: Swift/UVOT Upper Limits
  83. GRB 160501A: RATIR Optical and NIR Observations
  84. GRB 160501A: TAROT Calern observatory optical observations
  85. GRB 160501A MASTER-NET early observations
  86. GRB 160501A: NOT optical and NIR observations
  87. LSGT observation of GRB 160425A
  88. GRB 160425A: Swift/UVOT Detection
  89. GRB 160425A: Skynet PROMPT-CTIO observations of the optical afterglow
  90. GRB 160425A: SMARTS optical/IR observations
  91. GRB 160325A: Skynet PROMPT-CTIO observations of the optical afterglow
  92. GRB 160425A MASTER notices: possible host galaxy in the optical error-box
  93. GRB 160425A VLT/X-shooter redshift
  94. GRB 160425A: GROND observation
  95. GRB 160422A: Swift/UVOT Afterglow Confirmation
  96. GRB 160425A : MASTER earlier optical observations
  97. GRB 160425A: Swift detection of an unusual burst with an optical afterglow
  98. GRB 160422A: Swift-XRT afterglow detection
  99. GRB 160422A: Swift/UVOT Candidate Afterglow
  100. GRB 160417A: GMG observations

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