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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"

16203 results found.

  1. GRB 130427A: PAIRITEL NIR Detections
  2. GRB 130427A: P60 early detection
  3. GRB 130427A: early optical observations
  4. GRB 130427A: P60 early nondetection
  5. GRB 130427A: Swift detection of a very bright burst with a likely bright optical counterpart
  6. GRB 130420A: Continued Skynet/GORT Observations/Detections
  7. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  8. GRB 130420A: Continued RATIR Optical and NIR Observations
  9. GRB 130420A: ROTSE-III data analysis
  10. GRB 130420A: Continued RATIR Optical and NIR Observations
  11. GRB 130418A: Continued RATIR Optical and NIR Observations
  12. GRB 130420A: Early RAPTOR Simultaneous Multi-Color Observations
  13. GRB 130418A: WSRT radio observation
  14. GRB 130420B: RATIR Optical and NIR Observations
  15. GRB 130420A: Continued RATIR Optical and NIR Observations
  16. GRB 130420A: ISON-NM optical observations
  17. Skynet/GORT observations of GRB130420A
  18. GRB 130420B: Weihai optical upper limit
  19. GRB 130420B: Swift/UVOT Upper Limits
  20. GRB130420B: GMG optical upper limit
  21. GRB 130420A: GMG optical observation
  22. GRB130420A : Xinglong TNT optical upper limit
  23. GRB 130420A: Weihai Optical Observations
  24. GRB 130420B: MASTER-Net optical observations
  25. GRB 130420A: T21 optical observations
  26. GRB 130420A: RATIR Optical and NIR Observations
  27. GRB 130420A: PAIRITEL NIR detections
  28. GRB 130420A: ROTSE-III Detection of Optical Counterpart
  29. GRB 130420A: Swift detection of a burst with an optical counterpart
  30. GRB 130418A: Continued RATIR Optical and NIR Observations
  31. GRB 130418A: SMARTS optical/IR afterglow observations
  32. GRB 130418A: Submm observations from SMA
  33. GRB 130419B (Swift trigger Trigger 553930): MASTER-Net optical observations
  34. Trigger 553930: Swift detection of a possible flare from HR 5110
  35. GRB 130418A: T21 optical observation
  36. GRB 130418A: T18 and T21 optical observations
  37. GRB 130418A: LOAO Observation
  38. GRB 130418A, Swift-BAT refined analysis
  39. GRB130418A: VLT/X-shooter redshift confirmation
  40. GRB 130418A: REM NIR observations
  41. GRB 130418A: RATIR Optical and NIR Observations
  42. GRB 130418A: CARMA 3mm detection
  43. GRB 130418A: GROND detection of the optical-NIR afterglow
  44. GRB 130418A: TAROT Calern and TAROT la Silla observatory optical observations
  45. GRB 130418A: TNG optical observations
  46. GRB 130418A: Bassano Bresciano Observatory optical observations
  47. GRB 130418A: 1.23m I-band observations
  48. GRB 130418A: Swift detection of a burst with an optical counterpart
  49. GRB 130408a: Skynet Optical Observations
  50. GRB 130408A: SMARTS optical/IR afterglow observations
  51. GRB 130408A: Zadko observatory - Gingin optical observations
  52. GRB 130408A: GROND detection of the afterglow
  53. GRB 130408A: Swift/UVOT Detection of the Optical Afterglow
  54. GRB 130408A: Liverpool Telescope Optical candidate detection
  55. GRB 130327A: RATIR Optical/NIR afterglow confirmation
  56. GRB 130327A: Weihai optical obsevations
  57. GRB 130327A: Swift/UVOT Upper Limits
  58. GRB 130327A: ISON-NM optical upper limit
  59. GRB 130327A: RATIR Optical and NIR Observations
  60. report: GRB 130315A: Zadko observatory - Gingin optical observations
  61. GRB 130305A: optical upper limit in Mondy observatory
  62. GRB 130313A: optical upper limit in CrAO
  63. GRB 130313A: optical upper limit in Mondy observatory
  64. GRB 130315A: SALT optical observations
  65. GRB130313A: GTC early optical limits
  66. GRB 130313A: 5.8 GHz VLA upper limit
  67. GRB 130313A: Swift/UVOT Upper Limits
  68. GRB 130305A: PTF P48 optical upper limits
  69. GRB130315A BOOTES-3 optical limit
  70. GRB 130313A: RATIR Optical and NIR Observations
  71. GRB 130313A: TNG optical observations
  72. GRB 130215A: Detection of the SN with the 10.4m GTC
  73. GRB130313A: Optical observations from GTC
  74. GRB 130313A: NOT optical upper limit
  75. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  76. GRB 130313A: Weihai optical upper limit
  77. GRB 130313A: Zadko observatory - Gingin optical observations
  78. GRB 130313A: MASTER-Net optical observations
  79. GRB 130310A: optical observations
  80. GRB 130306A: Swift Detection of a Possible Afterglow
  81. GRB 130306A: MITSuME Ishigakijima upper limits
  82. GRB 130305A: Optical Observations
  83. GRB 111123A: Keck-I host detection and VLT/X-shooter redshift
  84. GRB 130306A: MASTER-Net pre-Swift alert observation
  85. GRB 130305A: Swift/UVOT Upper Limit
  86. GRB 121128A: optical observations in Mondy observatory
  87. GRB 121128A: optical upper limit in Maidanak observatory
  88. Trigger 549841: Swift detection of SGR1806-20
  89. GRB 130215A: PTF P48 optical detection
  90. GRB 130216B: MASTER-Net early observation
  91. GRB 130216A: MASTER-Net early observations
  92. GRB 130215A: Continued RATIR Optical and NIR Monitoring
  93. GRB 130216A: MITSuME Ishigakijima upper limits
  94. GRB 130216A: TAROT La Silla observatory optical observations
  95. GRB 130216A: OSN I-band observations
  96. GRB 130215A: P200 NIR observations
  97. GRB 130215A: GROND Detection of the Optical/NIR Afterglow
  98. GRB 130215A: MITSuME Okayama Optical Observation
  99. GRB 130215A: RAPTOR Measurements
  100. GRB 130215A: GMG optical observation

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