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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"

5859 results found.

  1. GRB 141020B: MAXI/GSC detection
  2. GRB 141017A: Swift detection of a burst
  3. GRB 141015A: LCO-McDonald observations
  4. GRB 141015A: Super-LOTIS early observations
  5. GRB 141015A: ISON-NM early optical observations
  6. GRB 141015A: Swift/XRT localization
  7. GRB 141015A: Swift detection of a burst
  8. IPN Triangulation of GRB 141011A (short/hard)
  9. GRB 141004A: GROND observations
  10. Swift observations of HD 305560
  11. Swift possible detection of the Be star HD 305560
  12. GRB 140930A/MAXI J2259+524: MASTER optical observations
  13. GRB 140930B: Keck NIR imaging
  14. GRB 140928A: MAXI-GSC detection
  15. GRB 140930B: MASTER early optical observations
  16. GRB 140930A/MAXI J2259+524: MAXI-GSC detection
  17. GRB 140928A: GROND Afterglow Candidate
  18. GRB 140919A, Swift-BAT refined analysis
  19. GRB 140919A: GROND afterglow candidate
  20. GRB 140919A: Swift detection of a burst
  21. Swift detection of outburst from 4U 1700+24
  22. GRB 140916A: MITSuME Okayama upper limits
  23. GRB 140916B: iPTF Optical Observations
  24. GRB 140916A: Swift detection of a burst
  25. GRB 140907A: Mondy optical observations
  26. GRB 140907A: TShAO observations
  27. GRB 140907A: MASTER optical observations
  28. GRB 140907A: Nishi-Harima NIR Observations
  29. GRB 140907A: MITSuME Akeno Optical Observation
  30. IPN Triangulation of GRB 140906C (short/hard)
  31. GRB 140907A: MITSuME Ishigakijima Optical Observation
  32. GRB140907A: MITSuME Okayama Optical Observation
  33. GRB 140907A : Optical observations from Nanshan
  34. GRB 140906A: iPTF optical transient candidates
  35. GRB 140901B: Swift XRT observation
  36. GRB 140903A: ISON-Kislovodsk observations
  37. GRB 140903A: MAXI/GSC upper limit
  38. GRB140903A: Discovery Channel Telescope Optical Detection
  39. IPN Triangulation of GRB 140901A (short/hard/very intense)
  40. GRB 140831A: iPTF observations of a possible short burst detected by Fermi GBM
  41. GRB 140815A: GROND afterglow candidate
  42. Swift trigger 609139 is probably 4U 1850-03
  43. GRB 140809A (FERMI trigger 429246673): MASTER follow-up inspection
  44. GRB 140808A: optical afterglow candidate iPTF14eag
  45. GRB 140801A: GROND Afterglow detection, unbroken decay
  46. GRB 140709B: TShAO optical upper limit
  47. GRB 140716A: GROND confirmation of the afterglow
  48. GRB 140719A: FTS observations
  49. Swift detection of UX Ari
  50. Fermi GBM Observations of SGR 1935+2154
  51. GRB 140709A: Continued RATIR Optical and NIR Observations
  52. GRB 140709B: update of Khureltogot optical upper limit
  53. GRB 140709B: Fermi GBM detection
  54. GRB 140709B: Khureltogot optical upper limit
  55. GRB 140709A: Fermi GBM detection
  56. GRB 140709B: MASTER optical observation
  57. GRB 140709B: Swift detection of a burst
  58. GRB140706A: GROND detection of the Optical/NIR afterglow
  59. GRB 140705A: KAIT Optical Upper Limit
  60. GRB 140705A: Swift-XRT refined Analysis
  61. GRB 140705A: Swift detection of a short burst
  62. GRB 140703A: P60 observations of a red, slowly-fading afterglow
  63. Fermi 425667201: optical counterpart search
  64. GRB 140626A: GROND Afterglow Candidate
  65. GRB 140622A: iTelescope.Net T11 Optical Observation
  66. GRB 140622A: KAIT Optical Upper Limit
  67. GRB 140622A: GROND Upper limits
  68. GRB 140622A: Swift detection of a short burst
  69. GRB 140619A: Swift detection of a burst with a possible optical counterpart
  70. GRB 140614B: Swift detection of a burst
  71. GRB 140614A: GROND afterglow candidate
  72. GRB140606B: DCT time of observation correction
  73. GRB 140606B: Swift XRT refined analysis
  74. GRB140606B/iPTF14bfu: Discovery Channel Telescope Optical Detection
  75. Fermi 423717114: Additional P48 and P60 observations
  76. Fermi423717114: iPTF optical transient candidates
  77. Konus-Wind observation of GRB 140529A
  78. GRB 140529A found in ground analysis of BAT slew data
  79. IPN Triangulation of GRB 140528A
  80. Swift detection of SFXT IGR J17544-2619
  81. GRB 140518A: P60 i-/z-band detections
  82. GRB 140518A: KAIT optical candidate
  83. GRB 140518A: Swift detection of a burst
  84. GRB 140515A: KAIT Optical Upper Limit
  85. Trigger 599041: Swift detection of SFXT IGR J16479-4514
  86. GRB 140515A: Swift detection of a burst
  87. GRB 140508A: MITSuME Akeno Optical observation
  88. GRB 140509B: MAXI/GSC detection
  89. GRB 140508A: iPTF optical transient candidate
  90. GRB 140502A: ISON-NM early optical limit
  91. GRB 140506A: Swift detection of a burst with an optical counterpart
  92. GRB 140430A: VLT/X-shooter redshift
  93. GRB140430A: Swift detection of a burst with an optical counterpart
  94. GRB 140423A: RTT150 optical observations
  95. IPN Triangulation of GRB 140428B (short/hard)
  96. GRB 140428A: 1.5m OSN I-band detection
  97. GRB 140428A: Keck detection of a red optical afterglow candidate
  98. GRB 140423A: NOT Afterglow Observations
  99. GRB 140423A pODI/WIYN afterglow photometry
  100. Swift Trigger 596958 is probably the flare star: DG CVn

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