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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"

21093 results found.

  1. GRB 080915A: GROND upper limits
  2. GRB 080916A: GROND lightcurve
  3. GRB 080916A: Rapid PROMPT Observations
  4. GRB 080916C: Swift UVOT Refined Analysis
  5. GRB 080916C: GROND Detection of the Optical Afterglow Candidate
  6. GRB080916A: Spectroscopic redshift
  7. GRB 080916C: Swift/XRT detection of possible afterglow
  8. GRB 080916B: Swift UVOT Refined Analysis
  9. GRB080916A: Refined Swift/UVOT Observations
  10. GRB 080915a, SMARTS optical/IR observations
  11. GRB 080916: REM detection of the NIR afterglow
  12. GRB 080916: REM candidate afterglow
  13. GRB 080915: REM NIR early observations
  14. GRB 080915: Swift/UVOT Upper Limits
  15. SGR 0501+4516 : P200 i-band observations
  16. GRB 080915: ROTSE-III Optical Limits
  17. GRB 080913: VLT/FORS spectrum
  18. GRB080913: Swift/UVOT Upper Limits
  19. GRB 080913: VLT/FORS2 observations
  20. GRB 080913: REM NIR early observations
  21. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  22. GRB 080906: Watcher observations
  23. Swift-BAT/-XRT refined analysis on trigger 324362 (LS I +61 303)
  24. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  25. GRB 080906: Refined Swift/UVOT Observations
  26. GRB 080905A: optical afterglow
  27. GRB 080906: GROND observations of the optical/NIR afterglow
  28. GRB 080905B: Refined UVOT Analysis
  29. GRB 080905A: NOT and VLT observations
  30. GRB 080905A: Swift-XRT Refined Analysis
  31. GRB080825C: Fermi-LAT observations
  32. GRB 080905: R & I-band optical observations
  33. GRB 080903: Swift/UVOT Observations
  34. GRB 080903: optical observations
  35. GRB 080903: Liverpool Telescope observations
  36. GRB 080903: Astrotel-Caucasus optical observations
  37. GRB 080903: Optical afterglow candidate
  38. GRB 080903: TAROT Calern observatory optical observations
  39. Recent VLA non-detection of SGR 0501+4516
  40. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  41. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  42. nIR observations of SGR 0501+4516
  43. SGR 0501+4516: Detection of possible optical counterpart
  44. SGR 0501+4516: WHT observations of the possible near-infrared counterpart
  45. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  46. VLA non-detection of SGR 0501+4516
  47. SGR 0501+4516: XMM-Newton monitoring schedule
  48. GRB 080825B: Swift-XRT team analysis
  49. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  50. GRB080825: Afterglow confirmation and redshift estimate
  51. Suzaku ToO Observation of SGR 0501+4516
  52. GRB 080825B - optical counterpart candidate
  53. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  54. Konus-Wind observations of new SGR 0501+4516
  55. INTEGRAL ToO Observation of SGR0501+4516
  56. Radio Detection of SGR 0501+4516
  57. SGR 0501+4516: MDM Optical Observations
  58. SGR 0501+4516: Astrotel-Caucasus optical observations
  59. SGR 0501+4516: WSRT Radio Observations
  60. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  61. SGR 0501+4516: optical observations
  62. GRB 080822 (SGR 0501+4516): archival optical observations
  63. GRB080810 - optical observations
  64. GRB080810: optical observations
  65. GRB 080810: RTT150 optical observations
  66. GRB 080810: Liverpool and Faulkes North observations
  67. GRB 080810: RTT150 optical observations
  68. GRB 080810: Swift/UVOT Refined Analysis
  69. GRB 080810: optical observations
  70. GRB 080810: Liverpool Telescope observations
  71. GRB 080810: Observations from NOT
  72. GRB 080810: RTT150 optical observations
  73. GRB 080810 : optical observation with KANATA
  74. GRB 080810: Swift detection of a burst with a bright optical afterglow
  75. GRB 080723B: GROND upper limits
  76. GRB 080805: Faulkes Telescope South optical observations
  77. GRB 080804: GROND observations
  78. GRB 080804: ATCA Radio Observations
  79. GRB 080805: Swift/UVOT Upper Limits
  80. GRB 080804: Swift/UVOT Refined Analysis
  81. GRB080804: Gemini South redshift confirmation
  82. GRB 080804: Faulkes Telescope South observations
  83. GRB 080805: VLT redshift
  84. GRB 080805: GROND detection of possible afterglow
  85. GRB 080804: UVES redshift
  86. GRB 080804: ROTSE-III Detection of Optical Counterpart
  87. GRB 080802: Swift/UVOT Upper Limits
  88. GRB 080802: UVI Telescope Upper Limit
  89. GRB 080727B: IR photometry
  90. GRB 080727A: Early IR observations
  91. GRB 080727C: TAROT Calern observatory optical observations
  92. GRB 080727B: KAIT photometry and an early lightcurve break
  93. GRB 080727B: GROND redshift limit
  94. GRB 080727C: Liverpool Telescope observations
  95. GRB 080727A: VLT upper limits
  96. GRB080727C: RTT150 optical observations
  97. GRB 080727B: Swift/UVOT Upper Limits
  98. GRB 080727A: Swift-XRT refined analysis
  99. GRB080727A: Swift/UVOT Upper Limits
  100. GRB 080727B: KAIT observations

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