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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 160417A: iTelescope T11 optical observations
  2. GRB 160417A: MITSuME Okayama upper limits
  3. GRB 160417A: KAIT optical afterglow confirmation
  4. GRB 160417A: Swift detection of a burst with an optical counterpart
  5. GRB 160411A - Gemini-S afterglow candidate
  6. GRB 160410A: SMARTS optical/IR observations
  7. GRB 160410A: TLS Tautenburg observations
  8. GRB 160412A: Swift/UVOT Upper Limits
  9. GRB 160410A: further NOT optical observations
  10. GRB 160410A: NOT observations of the afterglow
  11. GRB 160408A: 6.0 GHz VLA upper limit
  12. GRB 160411A: Gemini-S optical observations
  13. GRB 160411A: GROND Optical/NIR upper limits
  14. GRB 160411A: Swift/UVOT Upper Limits
  15. GRB 160410A: UKIRT near-IR upper limits
  16. GRB 160410A: TAROT La Silla observatory early optical observations
  17. GRB 160410A: MITSuME Akeno optical upper limits
  18. GRB 160411A: MASTER-NET early optical observations.
  19. GRB 160410A: GMG observation
  20. GRB 160410A: Keck-I/LRIS redshift
  21. GRB 160410A: Skynet PROMPT-CTIO observations of the optical afterglow
  22. GRB 160410A: VLT/X-shooter redshift
  23. GRB 160410A: GROND optical detection
  24. GRB 160410A: Swift detection of a (possibly-short) burst with an optical counterpart
  25. GRB 160408A: GMG observation limit
  26. GRB 160408A: Gemini afterglow confirmation
  27. GRB 160408A: TLS Tautenburg observations
  28. GRB 160408A: Swift/UVOT Upper Limits
  29. GRB 160408A: Gemini optical observations
  30. LIGO/Virgo G211117: 10.4m GTC follow-up of PS15dpn
  31. GRB 160401A: Swift/UVOT Upper Limits
  32. GRB 160401A: Zadko observatory - Gingin optical observations
  33. GRB 160401A: MASTER-IAC prompt optical observations
  34. GRB 160327A: Continued RATIR Optical and NIR Observations
  35. GRB 160327A: Early RAPTOR Limits
  36. GRB 160327A: Continued RATIR Optical and NIR Observations
  37. GRB 160327A: KAIT optical afterglow confirmation
  38. GRB 160327A: Mondy optical upper limit
  39. GRB 160327A: Swift/UVOT Upper Limits
  40. GRB 160327A: RATIR Optical and NIR Afterglow Detection
  41. GRB 160321A: AbAO optical observations
  42. GRB 160321A: Possible RATIR Optical and NIR Detections
  43. GRB 160321A: Swift/UVOT Upper Limits
  44. GRB 160321A: MASTER observations zero Galaxy latitude GRB
  45. GRB 160314A: Continued RATIR Optical and NIR Observations
  46. GRB 160313A: Mondy optical upper limit
  47. GRB 160314A: GROND optical/NIR observations
  48. GRB 160314A: ISON-Ussuriysk optical upper limit, updated photometry and correction of GCN 19184
  49. GRB 160314A: RATIR Optical and NIR Observations
  50. GRB 160314A: Mondy optical observations
  51. GRB 160313A: Swift/UVOT Upper Limits
  52. GRB 160314A: VLT/X-shooter redshift
  53. GRB 160314A: NOT afterglow observations
  54. GRB 160314A: Optical observations from OSN
  55. GRB 160228A: GROND afterglow confirmation and X-shooter host candidate redshift
  56. GRB 160314A: ISON-Ussuriysk optical upper limit
  57. GRB 160314A: Weihai optical upper limit
  58. GRB 160313A: Chante-Perdrix Observatory optical observations
  59. GRB 160313A: MASTER-Net optical observations
  60. GRB 160313A: TAROT Calern observatory optical observations
  61. GRB 160313A: RATIR Optical and NIR Observations
  62. GRB 160310A: MASTER-Kislovods observations
  63. GRB 160310A: Further NOT observations
  64. GRB 160310A: Swift/UVOT Upper Limits
  65. GRB 160310A: RATIR Optical and NIR Observations
  66. GRB 160310A: NOT optical observations
  67. GRB 160310A: LCOGT-SAAO optical upper limits
  68. GRB 160303A: GTC imaging of possible host galaxy
  69. GRB 160303A: Continued optical monitoring from NOT
  70. GRB 160303A: 9.8 GHz VLA upper limit
  71. GRB 160303A: MMT Optical Detection
  72. GRB 160303A: Continued RATIR Optical and NIR Observations
  73. LIGO/Virgo G211117: GRAWITA LBT follow-up of PS15dpn
  74. GRB 160303A: GROND Optical Detection
  75. GRB 160303A: BOAO R-band Detection
  76. GRB 160303A: McDonald 2.1m CQUEAN Detection
  77. GRB 160303A SMA observation
  78. GRB 160303A iTelescope observation
  79. GRB 160303A: Optical observations from the NOT
  80. GRB 160303A: Swift/UVOT Detection
  81. GRB 160303A: RAPTOR Observations During Gamma-Ray Emitting Interval
  82. GRB 160303A: RATIR Optical and NIR Afterglow Detection
  83. GRB 160303A: MITSuME Akeno optical upper limits
  84. GRB 160303A: LCOGT-FTN optical observations
  85. GRB 160303A: MITSuME Okayama upper limits
  86. GRB 160303A: ISON-NM early optical early limits
  87. GRB 160227A: LOAO 1.0m optical detection
  88. GRB 160228A: Swift/UVOT Upper Limits
  89. GRB 160228A: Mondy optcial observations
  90. GRB 160228A: RATIR Optical and NIR Observations
  91. GRB 160228A: MASTER-Amur prompt observations
  92. GRB 160227A: MASTER prompt OT Detection and LC
  93. GRB 160227A: AROMA-N Optical Observation
  94. GRB 160228A: GROND Afterglow Candidate
  95. GRB 160228A: optical observations
  96. GRB 160227A: NOT redshift
  97. GRB 160225A: TSHAO optical afterglow detection
  98. GRB 160227A: ISON-Kislovodsk optical observation
  99. GRB 160227A: Mt. Terskol observatory optical observation
  100. GRB 160227A: MASTER OT Detection

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