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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"

16112 results found.

  1. GRB 130418A: TNG optical observations
  2. GRB 130418A: Bassano Bresciano Observatory optical observations
  3. GRB 130418A: 1.23m I-band observations
  4. GRB 130418A: Swift detection of a burst with an optical counterpart
  5. GRB 130408a: Skynet Optical Observations
  6. GRB 130408A: SMARTS optical/IR afterglow observations
  7. GRB 130408A: Zadko observatory - Gingin optical observations
  8. GRB 130408A: GROND detection of the afterglow
  9. GRB 130408A: Swift/UVOT Detection of the Optical Afterglow
  10. GRB 130408A: Liverpool Telescope Optical candidate detection
  11. GRB 130327A: RATIR Optical/NIR afterglow confirmation
  12. GRB 130327A: Weihai optical obsevations
  13. GRB 130327A: Swift/UVOT Upper Limits
  14. GRB 130327A: ISON-NM optical upper limit
  15. GRB 130327A: RATIR Optical and NIR Observations
  16. report: GRB 130315A: Zadko observatory - Gingin optical observations
  17. GRB 130305A: optical upper limit in Mondy observatory
  18. GRB 130313A: optical upper limit in CrAO
  19. GRB 130313A: optical upper limit in Mondy observatory
  20. GRB 130315A: SALT optical observations
  21. GRB130313A: GTC early optical limits
  22. GRB 130313A: 5.8 GHz VLA upper limit
  23. GRB 130313A: Swift/UVOT Upper Limits
  24. GRB 130305A: PTF P48 optical upper limits
  25. GRB130315A BOOTES-3 optical limit
  26. GRB 130313A: RATIR Optical and NIR Observations
  27. GRB 130313A: TNG optical observations
  28. GRB 130215A: Detection of the SN with the 10.4m GTC
  29. GRB130313A: Optical observations from GTC
  30. GRB 130313A: NOT optical upper limit
  31. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  32. GRB 130313A: Weihai optical upper limit
  33. GRB 130313A: Zadko observatory - Gingin optical observations
  34. GRB 130313A: MASTER-Net optical observations
  35. GRB 130310A: optical observations
  36. GRB 130306A: Swift Detection of a Possible Afterglow
  37. GRB 130306A: MITSuME Ishigakijima upper limits
  38. GRB 130305A: Optical Observations
  39. GRB 111123A: Keck-I host detection and VLT/X-shooter redshift
  40. GRB 130306A: MASTER-Net pre-Swift alert observation
  41. GRB 130305A: Swift/UVOT Upper Limit
  42. GRB 121128A: optical observations in Mondy observatory
  43. GRB 121128A: optical upper limit in Maidanak observatory
  44. Trigger 549841: Swift detection of SGR1806-20
  45. GRB 130215A: PTF P48 optical detection
  46. GRB 130216B: MASTER-Net early observation
  47. GRB 130216A: MASTER-Net early observations
  48. GRB 130215A: Continued RATIR Optical and NIR Monitoring
  49. GRB 130216A: MITSuME Ishigakijima upper limits
  50. GRB 130216A: TAROT La Silla observatory optical observations
  51. GRB 130216A: OSN I-band observations
  52. GRB 130215A: P200 NIR observations
  53. GRB 130215A: GROND Detection of the Optical/NIR Afterglow
  54. GRB 130215A: MITSuME Okayama Optical Observation
  55. GRB 130215A: RAPTOR Measurements
  56. GRB 130215A: GMG optical observation
  57. GRB 130215A: iTelescope T11 observations
  58. GRB 130215A: Xinglong optical observations
  59. GRB 130215A: TAROT La Silla observatory optical observations
  60. GRB 130215A: RATIR Optical and NIR Observations
  61. GRB 130215A: REM NIR observations
  62. GRB 130215A: CARMA 3mm detection
  63. GRB 130215A: P60 Observations
  64. GRB 130215A: Redshift estimate
  65. GRB 130215: ROTSE-III Detection of Optical Counterpart
  66. GRB 130131B: CTIO 0.9-m optical upper-limits
  67. GRB 121128A: optical observations
  68. GRB 121123A: optical observations
  69. GRB 130211A: Swift/UVOT Upper Limits
  70. GRB 130131A: MITSuME Akeno Optical upper limits
  71. GRB 130131B: MITSuME Akeno Optical upper limits
  72. GRB 130122A: PTF P48 optical upper limits
  73. GRB 130206A: XRT and UVOT follow-up observations.
  74. GRB 130131B: optical upper limit in Mondy observatory
  75. GRB 130206A: Zadko observatory - Gingin optical observations
  76. GRB 130131A: optical observation in Mondy observatory
  77. GRB 130131A: Swift/UVOT Upper Limits
  78. GRB 130131A: RATIR optical and infrared upper limits
  79. GRB 130131A: RAPTOR Limits During Gamma-Ray Emitting Interval
  80. GRB 130131B: VLT/X-shooter acquisition camera limits
  81. GRB 130131B: Swift/UVOT Upper Limits
  82. GRB 130131B: MITSuME Okayama optical upper limits
  83. GRB 130131A: MITSuME Okayama optical upper limits
  84. GRB 130131B: TAROT Calern observatory optical observations
  85. GRB 130131B: Zadko observatory - Gingin optical observations
  86. GRB 130131A - Faulkes Telescope North Observations
  87. GRB 130122A: RTT150 optical observations
  88. GRB 130122A: optical observations
  89. GRB 130122A: Xinglong optical upper limit
  90. GRB 130122A: MASTER-Net early marginal detection of the OT
  91. GRB 130122A: Swift detection of a burst with an optical counterpart
  92. Short GRB 121226A: TNG observation of the host galaxy
  93. GRB 130102B: MASTER synchronous observations
  94. GRB 130102A: Swift/UVOT Upper Limits
  95. GRB 130102A: MASTER-Net optical observations
  96. GRB 130102A: IAC80 I-band observations
  97. GRB 121226A: 5.8 GHz VLA observations
  98. GRB 121229A: Swift/UVOT Upper Limits
  99. Skynet/PROMPT observations of GRB121229a
  100. GRB 121226A: 10.4m GTC optical observations

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