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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"

21018 results found.

  1. GRB 090530: NOT optical observations
  2. GRB090530: Swift XRT refined analysis
  3. GRB090530: Swift/UVOT afterglow detection
  4. GRB 090529: Swift-XRT refined analysis
  5. GRB 090529: OSN optical observations
  6. Strong radio emission from SN 2007bg one year after the explosion - detection of spreading, off-axis GRB jet?
  7. GRB 090530: GRAS002 refined OA analysis
  8. GRB 090530: GRAS002 optical observations
  9. GRB 090530: PAIRITEL NIR Detections
  10. GRB 090530A: ROTSE-III Detection of Optical Counterpart
  11. GRB 090529: optical observations
  12. GRB 090529: TLS Afterglow Observations
  13. GRB090529: UVOT/Swift detection of a brightening optical afterglow
  14. GRB 090529: Xinglong TNT optical observation
  15. GRB 090518 - NOT upper limit
  16. GRB 090520: GROND upper limits
  17. GRB 090516: Fermi GBM observation
  18. GRB 090519: GROND observation
  19. GRB 090519: FARO Chante Perdrix Observatory optical observations
  20. GRB 090519: TAROT Calern observatory optical observations
  21. GRB 090516: Observations from Stardome Observatory
  22. GRB090518: GROND upper limits
  23. GRB 090518: P60 Observations
  24. GRB 090516: GROND OBSERVATIONS
  25. GRB 090516: VLT redshift
  26. GRB 090516 - Zadko Telescope observations
  27. GRB 090516: NOT optical observations
  28. GRB 090516: Swift/UVOT Observations
  29. GRB 090516: Faulkes Telescope South optical afterglow
  30. GRB 090515: VLA observations
  31. GRB 090515: ROVOR Upper Limit
  32. GRB 090515: MMT/MMIRS NIR Upper Limit
  33. GRB 090515: Swift/UVOT Observations
  34. GRB 090509 - Zadko Telescope observations
  35. GRB 090515: Gemini-N upper limit
  36. GRB 090515: WIYN NIR Upper Limit
  37. GRB 090515: Super-LOTIS Upper Limits
  38. GRB 090515: PAIRITEL Upper Limits
  39. GRB 090510, Radio limits
  40. GRB090510: VLT/FORS2 spectroscopic redshift
  41. GRB 090510: GROND observations
  42. GRB 090510: Swift/UVOT host galaxy candidates
  43. GRB 090510: UVOT refined analysis
  44. GRB 090510: NOT afterglow confirmation
  45. GRB 090509, SMARTS optical/IR afterglow observations
  46. GRB 090418A: optical observation
  47. GRB 090509: REM NIR afterglow
  48. GRB 090323: optical observations
  49. GRB 090423: 250 GHz upper limit for a z=8.2 GRB with MAMBO-2 at the IRAM 30m
  50. GRB 080913: 250 GHz upper limit for a z=6.7 GRB with MAMBO-2 at the IRAM 30m
  51. GRB 090424: optical observations
  52. GRB 090427: GROND observations
  53. GRB 090429A: ROVOR magnitude limit
  54. Refined analysis of ICSP VLF observation of SGR J1550-5418 bursts on 22nd January, 2009
  55. GRB 090426: optical observations
  56. GRB 090429B: Gemini-N further nIR observations
  57. GRB 090424: YNAO-GMG observations
  58. GRB 090429A: GROND upper limits
  59. GRB 090418A BVRcIc field calibration
  60. GRB090429B: Gemini-N infrared IR candidate
  61. GRB 090426: YNAO-GMG observations
  62. GRB 090429B: VLT upper limits
  63. GRB 090429B: GROND Observations
  64. GRB 090429B: Super-LOTIS early observations
  65. GRB 090423: pseudo burst at z=1 and its relation to GRB 080913
  66. GRB 090424: Continued R-band monitoring
  67. GRB 090423: CARMA mm observations
  68. GRB 090423: millimeter detection
  69. GRB 090426: VLT spectroscopy
  70. GRB 090426: GROND Observations of the Optical/NIR Afterglow
  71. GRB090426 Swift/UVOT observations
  72. GRB 090423: GROND second epoch imaging and refined SED
  73. GRB090426: Observation for Optical counterpart from MIRO
  74. GRB090424: R-band detection (37.5 hrs post-burst), jet break?
  75. GRB 090424: MASTER-Net prompt optical limit
  76. GRB 090424: WHT ISIS spectroscopy
  77. GRB 090424 : Lulin 1m telescope optical observations
  78. GRB 090424: THO optical observations
  79. GRB 090424: GROND Observations of the Optical/NIR Afterglow
  80. GRB 090423: Swift/BAT spectral lag results
  81. GRB 090424 optical observations
  82. GRB 090424: Liverpool Telescope observations
  83. GRB 090424: Optical observations from 1.23m CAHA
  84. Swift/UVOT observations of GRB 090424
  85. GRB 090424: MASTER-Net prompt optical observations
  86. GRB 090424: TNT optical observations
  87. GRB 090424: ROTSE-III Confimation of Optical Counterpart
  88. GRB 090423: Deep z-band upper limit and confirmation of photo-z
  89. GRB 090423: TNG Amici spectrum
  90. GRB 090423: GROND detection and preliminary photo-z
  91. GRB 090423: NOT z-band limit
  92. GRB 090423: Correction to NIR photometry
  93. GRB090418A Rc-band photometry
  94. GRB 090423: NIR photometry and evidence for spectral break
  95. GRB 090423: UKIRT data further analysis
  96. GRB 090423: UKIRT K-band observations
  97. GRB 090423: P60 Observations
  98. GRB 090423: Faulkes Telescope South observations
  99. GRB 090422: Liverpool Telescope possible candidate
  100. GRB 090418B: RTT150 optical observations

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