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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"

16153 results found.

  1. GRB 160506A: TAROT La Silla observatory optical observations
  2. GRB 160506A: Swift/UVOT Upper Limits
  3. IceCube-160427A: iPTF Observations
  4. GRB 160504A: RATIR Optical and NIR Observations
  5. GRB 160504A: Swift/UVOT Upper Limits
  6. GRB 160504A: Bassano Bresciano Observatory upper limits
  7. GRB 160504A: TAROT Calern observatory optical observations
  8. ICECUBE-160427A : Pan-STARRS imaging and optical transients in the field
  9. GRB 160501A: SMARTS optical/IR observations
  10. GRB 160501A: MITSuME Okayama upper limits
  11. GRB 160501A: Swift/UVOT Upper Limits
  12. GRB 160501A: RATIR Optical and NIR Observations
  13. GRB 160501A: TAROT Calern observatory optical observations
  14. GRB 160501A MASTER-NET early observations
  15. GRB 160501A: NOT optical and NIR observations
  16. LSGT observation of GRB 160425A
  17. GRB 160425A: Swift/UVOT Detection
  18. GRB 160425A: Skynet PROMPT-CTIO observations of the optical afterglow
  19. GRB 160425A: SMARTS optical/IR observations
  20. GRB 160325A: Skynet PROMPT-CTIO observations of the optical afterglow
  21. GRB 160425A MASTER notices: possible host galaxy in the optical error-box
  22. GRB 160425A VLT/X-shooter redshift
  23. GRB 160425A: GROND observation
  24. GRB 160422A: Swift/UVOT Afterglow Confirmation
  25. GRB 160425A : MASTER earlier optical observations
  26. GRB 160425A: Swift detection of an unusual burst with an optical afterglow
  27. GRB 160422A: Swift-XRT afterglow detection
  28. GRB 160422A: Swift/UVOT Candidate Afterglow
  29. GRB 160417A: GMG observations
  30. GRB 160417A: iTelescope T11 optical observations
  31. GRB 160417A: MITSuME Okayama upper limits
  32. GRB 160417A: KAIT optical afterglow confirmation
  33. GRB 160417A: Swift detection of a burst with an optical counterpart
  34. GRB 160411A - Gemini-S afterglow candidate
  35. GRB 160410A: SMARTS optical/IR observations
  36. GRB 160410A: TLS Tautenburg observations
  37. GRB 160412A: Swift/UVOT Upper Limits
  38. GRB 160410A: further NOT optical observations
  39. GRB 160410A: NOT observations of the afterglow
  40. GRB 160408A: 6.0 GHz VLA upper limit
  41. GRB 160411A: Gemini-S optical observations
  42. GRB 160411A: GROND Optical/NIR upper limits
  43. GRB 160411A: Swift/UVOT Upper Limits
  44. GRB 160410A: UKIRT near-IR upper limits
  45. GRB 160410A: TAROT La Silla observatory early optical observations
  46. GRB 160410A: MITSuME Akeno optical upper limits
  47. GRB 160411A: MASTER-NET early optical observations.
  48. GRB 160410A: GMG observation
  49. GRB 160410A: Keck-I/LRIS redshift
  50. GRB 160410A: Skynet PROMPT-CTIO observations of the optical afterglow
  51. GRB 160410A: VLT/X-shooter redshift
  52. GRB 160410A: GROND optical detection
  53. GRB 160410A: Swift detection of a (possibly-short) burst with an optical counterpart
  54. GRB 160408A: GMG observation limit
  55. GRB 160408A: Gemini afterglow confirmation
  56. GRB 160408A: TLS Tautenburg observations
  57. GRB 160408A: Swift/UVOT Upper Limits
  58. GRB 160408A: Gemini optical observations
  59. LIGO/Virgo G211117: 10.4m GTC follow-up of PS15dpn
  60. GRB 160401A: Swift/UVOT Upper Limits
  61. GRB 160401A: Zadko observatory - Gingin optical observations
  62. GRB 160401A: MASTER-IAC prompt optical observations
  63. GRB 160327A: Continued RATIR Optical and NIR Observations
  64. GRB 160327A: Early RAPTOR Limits
  65. GRB 160327A: Continued RATIR Optical and NIR Observations
  66. GRB 160327A: KAIT optical afterglow confirmation
  67. GRB 160327A: Mondy optical upper limit
  68. GRB 160327A: Swift/UVOT Upper Limits
  69. GRB 160327A: RATIR Optical and NIR Afterglow Detection
  70. GRB 160321A: AbAO optical observations
  71. GRB 160321A: Possible RATIR Optical and NIR Detections
  72. GRB 160321A: Swift/UVOT Upper Limits
  73. GRB 160321A: MASTER observations zero Galaxy latitude GRB
  74. GRB 160310A: Terskol 2-m observations
  75. GRB 160314A: Continued RATIR Optical and NIR Observations
  76. GRB 160313A: Mondy optical upper limit
  77. GRB 160314A: GROND optical/NIR observations
  78. GRB 160314A: ISON-Ussuriysk optical upper limit, updated photometry and correction of GCN 19184
  79. GRB 160314A: RATIR Optical and NIR Observations
  80. GRB 160314A: Mondy optical observations
  81. GRB 160313A: Swift/UVOT Upper Limits
  82. GRB 160314A: VLT/X-shooter redshift
  83. GRB 160314A: NOT afterglow observations
  84. GRB 160314A: Optical observations from OSN
  85. GRB 160228A: GROND afterglow confirmation and X-shooter host candidate redshift
  86. GRB 160314A: ISON-Ussuriysk optical upper limit
  87. GRB 160314A: Weihai optical upper limit
  88. GRB 160313A: Chante-Perdrix Observatory optical observations
  89. GRB 160313A: MASTER-Net optical observations
  90. GRB 160313A: TAROT Calern observatory optical observations
  91. GRB 160313A: RATIR Optical and NIR Observations
  92. GRB 160313A: SAO RAS observations
  93. GRB 160310A: MASTER-Kislovods observations
  94. GRB 160310A: Further NOT observations
  95. GRB 160310A: Swift/UVOT Upper Limits
  96. GRB 160310A: RATIR Optical and NIR Observations
  97. GRB 160310A: NOT optical observations
  98. GRB 160310A: LCOGT-SAAO optical upper limits
  99. GRB 160303A: GTC imaging of possible host galaxy
  100. GRB 160303A: Continued optical monitoring from NOT

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