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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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 110107A: Swift/UVOT upper limits
  2. GRB 101219b. Possible radio afterglow detection.
  3. GRB 110106B: MASTER early optical observations
  4. GRB 110107A: Swift-BAT refined analysis
  5. GRB 110106A: ISAS-Kanazawa optical upper limit
  6. GRB 110106A: MITSuME Okayama optical upper limits
  7. GRB 110106A: Swift/UVOT Upper Limits
  8. GRB 110106A: TNG optical observations and candidate counterparts
  9. GRB 110106A: MASTER optical observations
  10. GRB 101225A: Host galaxy
  11. GRB 101219B: After 2 weeks still detected by Swift/UVOT
  12. GRB110102A: Swift/UVOT observations
  13. GRB110102A: MITSuME Okayama Optical Observation
  14. GRB 110102A: Swift detection of a burst with an optical detection
  15. GRB 101225A: optical break from NOT observation
  16. GRB 101225A: MMT spectroscopy
  17. GRB 101225A: P60 Observations
  18. GRB 101225: Optical follow-up of the Christmas burst
  19. Tentative redshift of GRB101225A (Christmas's burst) from Swift-XRT data
  20. Trigger 441015 / GRB 101225A: Further NOT optical observation
  21. Trigger 441015 / GRB 101225A: NOT optical afterglow candidate
  22. GRB 101225A (Swift trigger 441015): optical upper limit
  23. GRB 101224A: NOT optical observation
  24. GRB 101224A: Swift/UVOT Upper Limits
  25. GRB101224A: MITSuME Okayama optical upper limits
  26. GRB 101219B: Swift/UVOT refined analysis
  27. GRB 101219A: MITSuME Ishigakijima Optical upper limits
  28. GRB 101219B: GROND Detection of the Optical/NIR Afterglow
  29. GRB 101219A: IAC80 optical observations
  30. GRB 101219B: Swift detection of a burst with an optical afterglow
  31. GRB 101219A: Swift/UVOT Upper Limits
  32. GRB 101219A: GROND Upper limits
  33. GRB 101219A: Magellan NIR observations
  34. GRB 101219A - NOT observation - upper limit
  35. GRB 101219A: REM optical and NIR observations
  36. GRB 101219A: ROTSE-III Optical Limits
  37. XRF 101117A, RIMOTS optical upper limits
  38. GRB 101213A: Swift/UVOT Upper Limits
  39. GRB101204A GROND Detection of the Optical/NIR Afterglow
  40. GRB 101204A Afterglow Candidate, VATT Observations
  41. GRB 101201A: GROND Detection of the Optical/NIR Afterglow
  42. GRB 101123A: ROTSE optical observations
  43. GRB 101123A: MASTER prompt optical observations
  44. Optical observation of GRB 101024A
  45. GRB 101117B: Swift/UVOT Observations of the Optical Afterglow
  46. GRB 101112A: OSN and BTA observations
  47. GRB 101117B: Swift/UVOT Discovery of an Optical Afterglow
  48. Possible detection of INTEGRAL burst GRB 101112A by the EVLA
  49. GRB 101112A: optical observations
  50. GRB 10112A: MASTER optical observations
  51. GRB 101112A - XRT source detection/analysis
  52. GRB 101112A: BOOTES-2/TELMA optical afterglow candidate
  53. GRB 100906A: optical observations
  54. GRB 101030A : MOA optical observation
  55. GRB 101030A: GROND optical/NIR afterglow candidate
  56. GRB 101024A: GROND optical/NIR observations
  57. GRB 101024A: Zadko observatory - Gingin. Optical observations refined analysis
  58. GRB 101024A: Zadko observatory - Gingin. Optical observations
  59. GRB101024A: Swift/UVOT
  60. GRB 101024A: GRAS06 optical observations
  61. Swift/UVOT observations of GRB101023A
  62. GRB 101024A: Swift detection of a burst with an optical afterglow
  63. GGRB 101023A: GROND detection of the optical-NIR afterglow
  64. GRB 101023A: Gemini discovery of optical afterglow
  65. GRB 101020A: MASTER polarization optical observations
  66. GRB 101008A: optical observations
  67. GRB101017A: MITSuME Okayama optical upper limits
  68. GRB 101017A: ROTSE-III Optical Limits
  69. GRB 101017A: Swift detection of a burst with optical counterpart
  70. GRB 101011A: BOOTES-3 Upper Limit
  71. GRB 100906A: D50 optical detection
  72. GRB 100902A: D50 optical limit
  73. GRB 101011A: Swift/UVOT observations
  74. GRB 101011A, GROND upper limits
  75. GRB 101011A: Zadko observatory - Gingin optical observations
  76. GRB 101011A: Swift/UVOT Observations of a Possible Optical Afterglow
  77. GRB 101008A: MASTER prompt optical observations (correction to GCN#11328)
  78. GRB 101008A: MASTER prompt optical observations
  79. GRB101008A, GROND detection of a fading afterglow
  80. GRB 101008A: SAO RAS optical observations
  81. GRB 100915 optical upper limit
  82. GRB 101008: Swift/UVOT Upper Limits
  83. GRB 101008A: 1.23m CAHA optical observations
  84. GRB 100925A / MAXI J1659-152: MASTER optical observations
  85. GRB 100925A / MAXI J1659-152: Optical observation with the Kottamia 188cm telescope
  86. GRB100925A/MAXI J1659-152: X-shooter identification as an X-ray binary
  87. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  88. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  89. GRB 100925A/MAXI J1659-152 - NOT optical observations
  90. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  91. GRB 100924A: GROND detection of an optical/NIR afterglow
  92. GRB 100917A: TAROT La Silla observatory optical observations
  93. GRB 100915A: TAROT Calern observatory optical observations
  94. GRB100906A: Ashra-1 observation of early optical emission
  95. GRB100915A: MITSuME Ishigakijima Optical upper limits
  96. GRB 100915B: GRT Optical Observation
  97. GRB 100915A: GRT Optical Observation
  98. GRB100909A: MITSuME Ishigakijima Optical upper limits
  99. GRB 100901A: errata of GRB name in GCN 11270
  100. GRB 100901A: optical observations in Mondy and R-light curve

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